12 M³ / H Metal Cleaning Wastewater Desalination Treatment System

12 m³ / h Metal Cleaning Wastewater Desalination Treatment System

( Carbon filter + torsion-type pore-adjusting fiber filter + fine filtration + reverse osmosis)

Shanghai Yuhao Environmental Engineering Co., Ltd.

September 14 , 2025

Part 1: System Design Parameters and Standards

1 System design capabilities and effluent water quality requirements

The overall design capacity of the reverse osmosis treatment is 12 m³ / h, with a desalination rate greater than 96 % and a recovery rate of 70 % .

To better reflect the engineering characteristics of our company, the system design follows these guidelines:

1.1 Technological advancement

Optimal process flow and automatic control schemes are adopted, and high-performance equipment is selected to ensure that the water quality, water quantity and consumption ratio of the process system are optimal.

1.2 Equipment reliability

The equipment is guaranteed to operate continuously and stably 24 hours a day. All selected domestic and international products have a proven track record of long-term operation in reverse osmosis systems, ensuring continuous 24-hour operation and enabling unmanned operation.

1.3 Operational security

Our company promises that the design is scientific and reasonable, the selected equipment is of reliable quality, and it is equipped with an automatic operating system that will promptly alarm or shut down when the operating parameters are abnormal.

1.4 Cost-effectiveness

While ensuring quality, safety and reliability, we will minimize the system cost and water production cost to achieve the best performance-price ratio.

2 Design basis

GB150-98 Steel Pressure Vessels

JB2932-86 Technical Requirements for the Manufacturing of Water Treatment Equipment

JB2880-81 Technical Requirements for Welded Steel Pressure Vessels

Ministry of Labor's "Safety Technical Supervision Regulations for Pressure Vessels"

JB4730-94 Non-destructive Testing of Pressure Vessels

GB113-9128 Steel Pipe Flanges

JB2532-80 Pressure Vessel Painting, Packaging, and Transportation

HGJ34-90 "Design Conditions for External Corrosion Protection of Chemical Equipment and Pipelines"

HGJ32-90 "Rubber-lined Chemical Equipment"

DC130A16 Technical Specifications for Rubber Lining Equipment

ZBJ98020-90 "Series of Illustrations for Water Treatment Equipment"

GB6567-86 Graphical Symbols for Piping Systems

GB4270-84 Thermal Graphic Symbols and Letter Codes

GB2625-81 Graphical Symbols and Text Codes for Process Inspection and Control

JB/T2932-1999 Technical Conditions for the Manufacturing of Water Treatment Equipment (Appendix)

ZBJ98003-87 Technical Requirements for Painting and Packaging of Water Treatment Equipment

GB/T13384-92 General Technical Requirements for Packaging of Mechanical and Electrical Products

JBJ29-96 Standard for Construction and Acceptance of Compressor, Fan and Pump Installation Projects

Dow Chemical 's Reverse Osmosis Design Guidelines

3 Design Guidelines

Water supply type RO permeate well water land surface water waste water ocean water_ _ ( Filtering municipal wastewater ) MF 1 Traditional filtration MF 1 Traditional filtration Caisson /MF 1 Surface water sampling

SDI water supply SDI<1 SDI<3 SDI<3 SDI<5 SDI<3 SDI<5 SDI<3 SDI<5

Maximum recovery rate of components % 30 19 17 15 14 12 13 10

Typical flux gfd (l/m².h) 23(39) 19(32) 16(27) 15(25) 12(20) 10(17) 8.8(15) 7.3(12)

Maximum water production flow rate gpd(m³ / d)

320ft² components 10000(38) 7500(28) 6500(25) 5900(22) 5300(20) 4700(18) 7500(28) 6400(24) 365ft² components 10000(38) 8300(31) 7200(27) 6500(25) 5900(22) 5200(20) 380ft² components 12000(45) 8600(33) 7500(28) 6800(26) 5900(22) 5200(20) 8800(33) 7600(29) 390ft² component 10600(40) 8900(34) 7700(29) 7000(26) 6300(24) 5500(21) 400ft² component 11000(42) 9100(34) 7900(30) 7200(27) 6400(24) 5700(22) 440ft² components 12000(45) 10000(38) 8700(33) 7900(30) 7100(27) 6300(24)

Component type Minimum concentrate flow rate (gpm/h)

BW (365 ft²) 16(3.6) 16(3.6) 16(3.6) 18(4.1) 16(3.6) 18(4.1) BW (400 ft² and 440 ft²) 16(3.6) 16(3.6) 18(4.1) 18(4.1) 20(4.6) NF 16(3.6) 16(3.6) 16(3.6) 18(4.1) 18(4.1) 18(4.1) Full-Fit 25(5.7) 25(5.7) 25(5.7) 25(5.7) 25(5.7) 25(5.7) SW 16(3.6) 16(3.6) 16(3.6) 18(4.1) 16(3.6) 18(4.1) 16(3.6) 18(4.1)

Water supply type RO permeate well water Surface water waste water ocean water ( Filtering municipal wastewater ) MF1 conventional filter MF1 conventional filter Caisson /MF1 Surface water sampling

SDI water supply SDI<1 SDI<3 SDI<3 SDI<5 SDI<3 SDI<5 SDI<3 SDI<5

Maximum recovery rate of components % 30 19 17 15 14 12 13 10

Typical flux gfd (l/m².h) 23(39) 19(32) 16(27) 15(25) 12(20) 10(17) 8.8(15) 7.3(12)

4 Design and Supply Scope

• The equipment inlet and outlet are within 1 meter;

• Control system (including power distribution);

• Includes all equipment packing materials and membrane elements.

5 System influent water quality analysis

5.1 Inlet water quality description

The system influent is treated pickling wastewater; actual water quality parameters :

Customer provides water quality report

Sample Name Testing items	Rinse water ( Estimated )	waste acid	Processed data	Emission limits
pH	2.30	1.7	8	6 to 9
COD (mg/L)	284	6928	128	500
Ammonia nitrogen (mg/L)	35.2	1213	12	35
Total nitrogen (mg/L)	1000	24839	800-1000	70
Total phosphorus (mg/L)	Unstable	57	5-20	8
Total chromium (mg/L)	300	7580	0.35	0.5
Total iron (mg/L)	235	5800	0.16	10
Total nickel (mg/L)	108	4662	0.1-0.3	0.1
Fluoride (mg/L)	815	68200	4.5	20

5.2 Raw water quality analysis conclusions

In view of the characteristics of the influent water quality of this system , it is necessary to consider it from the design perspective, take into account all aspects, and improve it from the process perspective .

5.3 Basic design processing ideas

Based on the above water quality analysis and a reliable process flow, the following design approach is adopted:

1) First, the worst water quality is used as the reference water quality for this system, and based on this, detailed calculations are performed and the corresponding changes in the system after changes in water quality are fully considered.

2) Activated carbon filters are used as the pretreatment device for the system to remove particulate matter, silt, and some organic matter from the system influent.

3) The system is designed with a scale inhibitor dosing system to prevent the risk of scaling on the membrane element surface ;

4) The high-pressure pump adopts a high and low pressure protection control method, which improves the system operation quality while maximizing the system safety.

5) The reverse osmosis unit adopts a two-stage arrangement to maximize the utilization rate of the feed water;

6) The system adopts a fully intelligent RO controller to achieve fully automatic control, which greatly improves the automation level of the system operation and maximizes the safety of the system operation.

Part Two: Scheme Design Description

1 System process flow

5.4 System process flow

Existing wastewater treatment process:

In summary, this system adopts the following process flow:

Raw water undergoes initial treatment → activated carbon filter → torsion-type pore-adjusting fiber filter → security filter → high-pressure pump → RO unit → storage tank ( provided by the user ).

in:

• Raw water and pretreated product water: 15 m³ / h;

• Reverse osmosis permeate volume: 12 m³ / h;

• The system is controlled by a fully automatic RO intelligent controller .

5.5 Brief introduction to the reverse osmosis system process flow

This system relies on high-performance equipment and is guaranteed by automatic control, making the entire pretreatment process and equipment characterized by low investment costs, small footprint, wide adaptability to water quality changes, and high degree of automation, thus laying a solid foundation for the long-term stable operation of reverse osmosis.

The preprocessing section mainly addresses the following issues:

• It adapts to changes in wastewater quality, achieving strong interception capacity and high treatment precision.

• To prevent the reverse osmosis membrane element from generating colloidal substances, suspended solid particles, silt, large molecular organic matter, microbial fouling, and inorganic salt scaling (including crystallization of iron and aluminum oxides due to concentration);

• Maintain long-term stable operation of the reverse osmosis system and a stable water production rate.

Reverse osmosis and post-treatment mainly address the following issues:

• Reverse osmosis removes over 95 % of inorganic salts and silica;

Introduction to Reverse Osmosis Pretreatment Process

5.6 Pre-supply method

a pretreatment method combining filters and scale inhibitors .

• The water supply pressure is maintained at approximately 0.35 MPa.

The quality (pressure index) of the raw water supply directly affects the safe and stable operation of subsequent equipment.

5.7 Pretreatment dosing system

5.7.1 Scale inhibitor reducing agent dosing device

To prevent the concentration of dissolved solids on the concentrate side of the RO membrane element during desalination, which leads to crystallization due to the concentration product exceeding the solubility equilibrium constant Ksp, and scale formation on the RO membrane surface, thus affecting the membrane's desalination rate, water flux, operating pressure, and other performance parameters, and to prevent the formation of scale if small crystals are not treated promptly, the dissolved solids will use them as nuclei for crystal growth, causing the crystals to enlarge and eventually pierce the membrane surface, damaging the reverse osmosis unit, a scale inhibitor dosing device is installed before the reverse osmosis unit.

During operation, reverse osmosis, due to its cross-flow filtration/osmosis operation mode, produces a certain amount of concentrate containing approximately 98% of the inorganic salts, organic matter, and colloids from the raw water, in addition to producing high-quality product water. The recovery rate of reverse osmosis units varies depending on the system recovery rate and the arrangement of membrane elements. In the reverse osmosis concentrate, when the dissolution equilibrium constant of inorganic salts exceeds its KSP value, the inorganic salts will crystallize and precipitate, which is the basic reason for scaling on reverse osmosis membrane elements.

Scale inhibitors, through their chemical action, increase the solubility of inorganic salts and colloids in water. This prevents these scale-causing components from crystallizing and precipitating out of the concentrate, even if their KSP values exceed normal levels, thus ensuring the long-term stable operation of the reverse osmosis unit. Practical experience has proven that scale inhibitors/dispersants are unparalleled in their role as a protector of stable reverse osmosis unit operation compared to other scale inhibition methods. Their superior control quality, low operating costs, and reliable and effective protection are also unmatched by other scale inhibition methods.

In summary, the scale inhibitor added to this system not only needs to have high LSI control capability, but also high dispersion control capability.

5.7.2 Drug dosing and diversion

The dosing system consists of a dissolving tank, a metering pump, and corresponding pipes and valves. To ensure thorough mixing of the added chemicals with the raw water, our company has installed a chemical diversion pipe at the dosing point .

5.8 Activated carbon filter

This equipment is suitable for removing suspended solids, silt, mechanical impurities , and some organic matter from water . The filter media is refined activated carbon .

A torsion-type pore-adjusting fiber filter is installed after the activated carbon filter.

5.9 Multistage centrifugal high-pressure pump

5.9.1 The high-pressure pump is the energy feed section of the reverse osmosis system; it is the "heart" of reverse osmosis.

Reverse osmosis membrane elements have selective permeability to ions in water, resulting in an osmotic pressure difference between the concentrate and product water sides. External pressure is required to overcome this osmotic pressure difference so that the reverse osmosis unit can operate normally and meet design requirements. This external pressure is provided by a high-pressure pump. Therefore, it can be said that the high-pressure pump is the feed part of the reverse osmosis unit, the "heart" of the reverse osmosis unit, and the superior performance of the "heart" will determine the reliability of the reverse osmosis unit's operation.

5.9.2 Clayson high-pressure pumps are a reliable guarantee.

Clayson stainless steel multistage centrifugal high-pressure pumps are renowned for their stability and reliability in reverse osmosis water treatment systems due to their advanced manufacturing processes. Their excellent operating performance and reliable operating quality have resulted in a longer trouble-free operating record and a wide market share in reverse osmosis water treatment systems.

5.9.3 High pressure pump selection

The selection of the high-pressure pump is crucial in this system. Choosing an undersized pump means that after one to two years of operation, the reverse osmosis equipment will be unable to produce the rated amount of permeate, jeopardizing the safe and stable operation of the entire system and inevitably leading to the awkward situation of having to replace membrane elements even when their performance is still good. It should be said that many factors affect the operating pressure of reverse osmosis, including the following:

• The effect of temperature;

• The effect of influent salinity;

• The impact of service life;

• The effects of pollution or blockage.

Any change in the above conditions means a change in the operating pressure of reverse osmosis.

Based on the above analysis, and especially considering factors such as contamination, temperature variations, and prolonged operation of the reverse osmosis system, the outlet pressure of the high-pressure pump is selected to be around 1.2 MPa . Therefore, a single reverse osmosis unit will be operated by one Clayson stainless steel multistage centrifugal high-pressure pump with a rated flow rate of 15 m³ /h and a head of 150 m .

5.10 Security Filter

To prevent the reverse osmosis membrane elements from being clogged by suspended particles, a security filter needs to be installed at the inlet of the high-pressure pump.

5.10.1 Security Filter Filtration Mechanism

During operation, the intercepted dirt and impurities in a security filter cartridge form a "bridging" effect on its surface, allowing the dirt and impurities to intercept similar particles. Filtration efficiency increases with operating time. However, as operating time extends, while filtration precision gradually increases, the inlet and outlet pressure difference also gradually increases. When the pressure difference becomes too large, impurities and dirt are forced deeper into the filter cartridge, deteriorating the quality of the produced water. To improve the quality of the system's influent, the security filter should be removed and replaced when the inlet and outlet pressure difference reaches 0.1 MPa. Under normal operating conditions, the filter cartridge can maintain a filtration life of 6-7 months or more.

5.10.2 Security filter configuration

The reverse osmosis unit is equipped with one security filter with an output of 15 m³ / h . The basic configuration is as follows:

• It has a diameter of 300 mm and is made of stainless steel.

• The filtration accuracy is 5µm, and the filter element is made of polypropylene.

• It is filled with 12 40″ long filter elements;

• Filtration rate: 240 m/h;

• It is in the form of a vertical cylinder.

5.11 Reverse osmosis unit

5.11.1 Reverse osmosis principle

The main desalination mechanism of a reverse osmosis membrane element is similar to that of a semi-permeable membrane, allowing selective permeability to ions in water, as shown in the figure below:

Under natural conditions, a semipermeable membrane (reverse osmosis membrane) allows the solvent (water) to permeate naturally from the low concentration side to the high concentration side, achieving natural osmotic equilibrium when a certain osmotic pressure difference is formed. When external pressure is applied to the high concentration side, the solvent on the high concentration side overcomes the natural osmotic pressure and the natural liquid level difference , causing water molecules to permeate in reverse from the high concentration side to the low concentration side.

5.11.2 Reverse osmosis membrane filtration falls under the category of crossflow filtration.

The operation of a reverse osmosis membrane separation system is completely different from that of a traditional filtration system. In a traditional filtration system, all water passes through the filter bed. When the contaminant removal capacity decreases to a certain limit, backwashing removes the trapped contaminants from the filter bed. In a reverse osmosis system, however, a portion of the raw water flows through the membrane perpendicular to its surface, while the remaining water flows parallel to the membrane surface. Technically, this falls under the category of crossflow filtration.

The following diagram illustrates the filtration and permeation processes of a membrane element during operation:

5.11.3 A well-designed reverse osmosis system can perform a good self-cleaning process.

During the water production process of a reverse osmosis system, when water flows perpendicularly through the reverse osmosis membrane, salts and other colloidal contaminants in the feed water will inevitably be concentrated on the membrane surface due to the net pressure of the feed water. At the same time, the remaining water that does not permeate will be carried away by the contaminants concentrated on the membrane surface in a direction parallel to the membrane surface. In other words, a well-designed reverse osmosis system can complete a good self-cleaning process while operating normally.

5.11.4 A good crossflow velocity can effectively control the fouling rate of a reverse osmosis system.

Engineering practice shows that selecting appropriate water flux and crossflow velocity during the separation process is crucial for effectively controlling the fouling rate of reverse osmosis systems. Excessively high water flux will cause the membrane fouling rate to increase exponentially, while a higher crossflow velocity increases the turbulence of the water flow during system operation, thereby reducing the deposition of particulate matter already inside the membrane system on the membrane surface or its accumulation in the compartment gaps. Furthermore, the higher crossflow velocity increases the diffusion rate of high-concentration salts from the membrane surface into the bulk water flow, further reducing the risk of sparingly soluble substances precipitating on the membrane surface.

5.11.5 Reverse osmosis unit performance indicators

Considering the overall system situation and adhering to the principle of facilitating the long-term stable operation of the system, our company has designed the reverse osmosis unit as follows:

5.11.5.1 Increasing membrane area to improve the antifouling performance of reverse osmosis

Increasing the membrane area can reduce the permeate flow rate of a single membrane element, thereby reducing the water flux and increasing the antifouling performance of reverse osmosis. This system has a permeate flow rate of 12 m³ / h, using 15 membrane elements. The average permeate flow rate of a single membrane element is 0.8 m³ / h, which is within the safe range for membrane elements.

5.11.5.2 High-performance, high-desalination-rate composite membrane

To ensure that the reverse osmosis permeate meets the system's water requirements, this system uses a high-performance, high-desalination-rate composite membrane, specifically an HZY polyamide composite membrane . In a test at 225 psi and 2000 ppm NaCl solution, the stable desalination rate reached 99.5%, and the permeate flow rate reached 11000 gpd. Because the test standards used are stricter than the actual operating conditions, the actual operating pressure may exceed the calibrated standard test values during operation.

High-performance composite membranes with excellent desalination rates are the guarantee for the long-term stable operation of the system and the fundamental guarantee that the system can meet the water quality requirements of the system under reverse osmosis operation configuration for a long time.

5.11.5.3 Use high-performance pressure vessels

Membrane elements, installed in pressure vessels to form membrane modules, can be figuratively compared to a person's "brain," while the pressure vessel is the "skull" protecting that "brain." The performance of the pressure vessel is crucial for the safe and stable operation of the membrane elements. Pressure vessels are made of epoxy resin fiberglass/fiber winding, with a white high-gloss polyester paint finish on the outer surface. They possess excellent pressure stability and a very low overall expansion coefficient. Extensive engineering practice has proven that high-quality pressure vessels exhibit superior performance, fully meeting the various requirements for membrane element operation in reverse osmosis systems.

This system is configured with 5 pressure vessels arranged in two stages , with 3 membrane elements installed in each pressure vessel . The material is fiberglass.

5.11.5.4 Properly arranged membrane elements can improve antifouling performance.

The single-stage, two-section arrangement effectively increases the lateral flow velocity of the concentrate in the membrane element, thus minimizing uneven fouling of the reverse osmosis membrane element by organic matter . Computer simulations have shown that the single-stage, two-section arrangement is the optimal configuration, reducing system operating pressure by approximately 0.5 bar compared to other arrangements, thereby maximizing system safety.

5.11.5.5 Automatic replacement of concentrate on the concentrate side with RO permeate to improve fouling resistance.

The system is equipped with a flushing electric valve and a concentrate electric discharge valve on the inlet side. When the reverse osmosis unit is shut down, the concentrate in the membrane element is replaced with reverse osmosis permeate to prevent inorganic salts, organic matter, colloids and other impurities from precipitating in the membrane element after shutdown, thereby maximizing the antifouling performance of the reverse osmosis unit.

5.11.5.6 Reverse osmosis unit description

After filtration and the addition of scale inhibitor, the pretreated water enters the high-pressure pump, which pressurizes it before it enters the reverse osmosis unit. More than 98% of inorganic salts, organic matter, and colloids are retained and discharged through the concentrate pipeline along with the 25% impurity water .

The process requires a single reverse osmosis unit with an output of 12 m³ / h, a desalination rate of ≥96 % , and a water recovery rate of ≥70 %.

The reverse osmosis unit is equipped with flow meters, conductivity meters, pressure gauges, centralized sampling devices, and related control components. A non-conforming product water discharge valve is installed on the product water side to discharge non-conforming product water generated during startup, maintenance, and commissioning, preventing it from entering subsequent processes.

When starting a reverse osmosis system, it is crucial to prevent water hammer. Water hammer occurs when air is trapped in the pressure vessel. If this air is not properly expelled during startup, the high-pressure water flow carrying the air creates severe vibrations, potentially shattering the membrane elements and causing irreversible damage. To prevent water hammer, this system features a slow-opening inlet valve at the high-pressure pump outlet. When starting the high-pressure pump, the valve opens gradually, allowing the reverse osmosis feed pressure to increase slowly .

5.12 Chemical cleaning of reverse osmosis

As the pretreatment design of reverse osmosis units becomes more sophisticated, the frequency of membrane element cleaning can be reduced. However, it is impossible to completely prevent membrane element fouling, and the reverse osmosis system ultimately requires cleaning. The chemical cleaning interface of this system is connected to the existing chemical cleaning system via a dedicated cleaning pipeline.

5.12.1 Basis for chemical cleaning of reverse osmosis membranes

RO system will need to be cleaned when it shows signs of contamination ( a 10-15% decrease in permeate flow rate after standardization, a 10-15% decrease in permeate quality after standardization , or a 10-15% increase in pressure drop between feedwater and concentrate ) , before a long-term shutdown, or during scheduled routine maintenance .

5.12.2 Standardization of reverse osmosis

Water temperature has a significant impact on water production. As water temperature increases, water flux increases almost linearly. This is mainly due to the decrease in viscosity of water molecules permeating the membrane and the increase in diffusion capacity. Since the influent water temperature may change, it is difficult to determine whether the membrane system is fouled or its performance has deteriorated when the temperature difference is large. Therefore, it is necessary to standardize the reverse osmosis data.

The table below shows the temperature compensation coefficients for different temperature ranges, with a base value of 1.0 at 25 ℃.

	Temperature ( °C)	Temperature Correction Factor (TCF)	Temperature ( °C)	Temperature Correction Factor (TCF)
10.0	1.711	18.0	1.276
11.0	1.648	19.0	1.232
12.0	1.588	20.0	1.189
13.0	1.530	21.0	1.148
14.0	1.475	22.0	1.109
15.0	1.422	23.0	1.071
16.0	1.371	24.0	1.035
17.0	1.323	25.0	1.000

*Corrected flow rate = Measured flow rate × Corresponding inlet water temperature correction factor (TCF)

The corrected flow rate is derived from the initial 72 hours of operation data and used as a reference standard value. When the system operating conditions change, the standardized data is compared. When the flow rate drops by 15%, maintenance cleaning of the system should be considered to prevent severe membrane fouling.

5.12.3 System chemical cleaning

5.12.3.1 Determining when to clean

First, the nature and location of the contamination should be determined. Then, a suitable chemical solution should be used for cleaning through the cleaning ports provided in each reverse osmosis module. The cleaning device includes a solution tank, a 5µm security filter, a cleaning pump, and related control circuitry. The cleaning device consists of a cleaning pump, cleaning tank, 5µm security filter, and related flow meters, pressure gauges, valves, pipes, and fittings. During cleaning, attention must be paid to the selection of cleaning chemicals, dosage, pH value, cleaning temperature, and cleaning time. Using the least corrosive chemicals will extend the membrane's lifespan.

5.12.3.2 Cleaning Precautions

• When adjusting the pH value, caution must be exercised to extend the membrane's lifespan. The pH range for less corrosive pharmaceuticals is 4-10 , and the maximum permissible pH range is 2-12 .

• Do not mix high-pH and low-pH chemicals. Before adding the next solution, thoroughly flush the system to drain the previous cleaning solution.

• Confirm that you are following the correct cleaning operating procedures and cleaning solution treatment requirements.

6 Control of reverse osmosis unit

The reverse osmosis unit is the core component of the entire desalination system, and the quality of its control and performance will determine whether the reverse osmosis unit can operate stably for a long time.

6.1 Control Chain

6.1.1 High-pressure pump interlocked with high and low pressure protection

When the outlet pressure of the security filter is higher than the set value, the conditions for starting the high-pressure pump are met; when the pressure is lower than the set value, the high-pressure pump stops running to prevent it from operating without water.

When a high-pressure protection signal is detected, the high-pressure pump-stage reverse osmosis system will stop operating and issue an alarm signal to alert on-duty personnel to handle the fault.

When a low-pressure protection signal is detected, the high-pressure pump must not be restarted within 90 seconds; when a high-pressure protection signal is detected, the reverse osmosis unit must not be started within 15 minutes. The purpose of the interlocking control is to prevent the escalation of the fault and to minimize the frequent start-stop of the high-pressure pump.

6.2 Control methods of reverse osmosis units

The reverse osmosis local control panel can control all control equipment, which can be divided into manual control and automatic control.

6.2.1 Manual control on the local reverse osmosis control panel

The reverse osmosis local control panel is equipped with a manual control button. When the button is switched to the manual side, the electrical equipment can be manually controlled under the industrial computer control.

6.2.1.1 Switching on/off of permeate drain valve, concentrate valve, and flushing electric valve

When the permeate drain valve, concentrate valve, and flushing electric valve are switched to the open position, they will be fully opened within 40 seconds. When they reach the open position, the internal limit switch will cut off the power supply. At the same time, the limit switch outputs a switching signal, and the valve opening indicator light is illuminated.

When the permeate drain valve, concentrate valve, and flushing electric valve are switched to the closed position, the concentrate valve and flushing electric valve will be completely closed within 40 seconds. When they reach the closed position, the internal limit switch will cut off the power supply; at the same time, the limit switch will output a switching signal, and the valve closing indicator light will be lit.

6.2.2 Automatic control on the local control panel for reverse osmosis

When the button is switched to the automatic side, the electrical equipment can be automatically controlled under the intelligent controller :

Press the main start button, and the reverse osmosis unit will execute the automatic program control under control:

a) First, the controller controls the system to detect all interlocking points;

b) Close the concentrate electric valve and purge the system for 30 seconds;

c) Start the high-pressure pump, product water drain valve, and concentrated water electric valve to perform high-pressure flushing for 60 seconds;

d) Close the concentrate electric valve;

e) The system is running normally.

f) The controller monitors interlocking control points in real time, and will automatically execute a shutdown procedure when a high liquid level is detected during operation .

g) Open the concentrated water electric valve, perform high-pressure flushing for 30 seconds, and then close the concentrated water electric valve.

h) Stop the high-pressure pump, close the product water drain valve, and simultaneously open the flushing electric valve and start the flushing water pump. When the flushing water tank level is low, stop the flushing water pump and close the flushing electric valve.

The system is equipped with an independent intelligent controller and an LCD touch screen, which has functions such as displaying the equipment process flow, real-time display of operating parameters, equipment start-up, shutdown and adjustment.

6.3 System Instrumentation and Protection

The reverse osmosis unit is equipped with some instruments, protection devices, and self-diagnostic functions, which give the reverse osmosis unit a basic level of intelligence.

6.3.1 System Instruments

The reverse osmosis system is equipped with advanced feed water conductivity meters, product water conductivity meters, product water flow meters, and concentrate flow meters; it is also equipped with shockproof pressure gauge components to monitor various operating parameters of the reverse osmosis system.

Four : Equipment List

I. Preprocessing System

1

Activated carbon filter

Φ 12 0 0

1 unit

Fiberglass

Shanghai Yuhao

Equipment body valves

manual valve

1 set

combination

Domestic

Equipment body piping

1 set

UPVC

Shanghai Yuhao

raw water flow meter

1 unit

Domestic

Imported pressure gauge

0—1.0 MPa

1 piece

Stainless steel

Shanghai

2

Torsion-type pore-adjusting fiber filter

Φ 48 0

1 unit

carbon steel

Shanghai Yuhao

Equipment body valves

manual valve

1 set

combination

Domestic

Equipment body piping

1 set

Domestic

3

Precision Filter MF

Φ 30 0

1 unit

SUS304 internal epoxy coating

Shanghai Yuhao

Inlet and outlet pressure gauges

0-1.0MPa

1 piece

Stainless steel

Shanghai

meltblown filter element

5μm, L = 1000 mm

12

PPF

Domestic

II. Reverse Osmosis System

1

High pressure pump

BLT16

1 unit

Stainless steel

Clayson

pressure gauge

0-2.5MPa

2 pieces

Stainless steel

Domestic

low voltage switch

BD-A

1 set

Domestic

High voltage switch

BD

1 set

Domestic

2

RO host

RX RO - 12

1 set

Assemblies

Shanghai Yuhao

Membrane elements

Antifouling membrane

15

Aromatic polyamide

Haizeyuan

pressure vessel

8 ″ × 3 cores

5

Fiberglass

Domestic

Freshwater flow meter

20 T/H

1 unit

Yuyao

Concentrate Flow Meter

5 T/H

1 unit

Yuyao

Online conductivity

2 units

Shijiazhuang

Oil-impregnated shockproof pressure gauge

0-3MPa

2 pieces

Stainless steel

Domestic

Concentrate drain solenoid valve

DN2 0

1 unit

copper

Domestic

High-pressure side pipelines and valves

1 set

Stainless steel

Shanghai Yuhao

Low-pressure side piping and valves

1 set

UPVC

Shanghai Yuhao

frame

1 set

Stainless steel

Shanghai Yuhao

Scale inhibitor system

1 set

Metering box metering pump

Domestic

III . Electrical Control System

1

control box

Supporting

1 unit

Shanghai Yuhao

2

electrical components

Supporting

As needed

3

Wires and cables

Supporting

Shanghai Yuhao

IV. System piping, fittings, valves, etc.

As needed

Shanghai Yuhao

V. Filter media, packing materials, etc.

VI. Biochemical MBR

Part Five: Engineering and Technical Services and After-Sales Service

5.1 Within two weeks of signing the technical agreement, the supplier shall provide the client with two copies of the following: general equipment drawing, installation drawing, equipment foundation data diagram, system diagram, terminal wiring diagram, and relevant data and technical documents such as load and electrical load, all meeting the requirements of the construction drawing design. The supplier shall also provide the client with all drawings, user manuals, operation manuals, and all test and inspection reports related to the equipment's manufacturing quality, along with all necessary technical documents for installation, operation, and maintenance.

5.2 The supplier shall provide a detailed list of all imported equipment and parts, as well as a detailed list of domestically produced equipment and parts.

Six : Supply and Quality Management

1 Supply requirements and scope

6.4 Supply requirements

Our company ensures that all goods originate from within the People's Republic of China or from countries and regions that have normal trade relations with the People's Republic of China.

Our company ensures that the goods supplied are brand new, unused, the latest or current model, and of good quality, without defects, with a long service life and low maintenance requirements, meeting the general and special performance requirements of this specification.

Our company can guarantee the provision of complete and high-quality equipment, accessories, and software that meet the contract requirements and ensure the functionality of the equipment.

Our company can guarantee the realization of the equipment, accessories, software, and integrated operation functions specified in the contract. We are responsible for comprehensive systems engineering, ensuring that all equipment, components, and systems form a complete system.

※Spare parts and others

Our company must provide a list of the easily damaged parts, necessary accessories, and special tools that come with the equipment.

All spare parts supplied by our company should be new, unused, and perfectly compatible with the parts to be replaced. These spare parts should be treated and packaged to withstand long-term storage in the site's climatic conditions without damage. The name, purpose, or serial number of each spare part should be clearly labeled on the side of its packaging. If more than one type of spare part is contained in one box or other containers, a summary description of the contents should be provided on the side of the box, and a packing list should be included inside. Furthermore, the packaging design should facilitate easy opening and repackaging.