BSSTREAT*BW-8040
Product Description
The BSSTREAT*BW-8040 membrane product is a low-pressure aromatic polyamide composite reverse osmosis membrane element widely used for desalination of surface water and groundwater. The product features a high desalination rate and high water production. It is mainly applied to the desalination treatment of brackish water, surface water, groundwater, tap water, etc. with a salt content of 5000mg/L or less. Its application fields include the preparation of pure water in electronics, power, municipal drinking water, chemical engineering, medicine and other industries. It can also be used in wastewater reuse, concentration and other projects.
The main advantages of the product
• High desalination rate and high stability
• High economic efficiency and wide applicability
• High water production and low operating pressure
Model and performance parameters
|
Model |
Effective membrane areaft2(m2) |
Water production volumeGPD（m3/d） |
The thickness of the water inlet grid（mil） |
Stabilize the desalination rate(%) |
Stabilize the desalination rate(%) |
|
BSSTREAT* BW-8040 |
400(37.2) |
10500(39.7) |
28 |
99.60 |
99.50 |
Product Instructions
A The above performance parameters are derived based on the following test conditions:
|
Test solution |
Test solution(℃) |
pH value |
Test pressurepsi(MPa) |
Recycling(%) |
|
2000mg/L NaCl |
25 |
7.5-8.0 |
225(1.55) |
15 |
B The water output of a single component may fluctuate within the range of ±15%.
C Operating limit
Maximum operating pressure••••••••••••••••••••••••••••••••••••••••••••••••••••••••600psi（4.14MPa）
Maximum influent flow rate•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••17.0m3/h（8040）
Maximum inlet water temperature••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• ••••0-45℃
Maximum water inflowSDI15•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••5.0
Maximum residual chlorine concentration••••••••••••••••••••••••••••••••••••••••••••••••••••••0.1mg/L
The pH range of the influent water during continuous operation•••••••••••••••••••••••••••••••••3-10
The pH range of the influent water during chemical cleaning••••••••••••••••••••••••••••••••••••••1-13
The maximum allowable voltage drop of a single membrane element•••••••••••••••••••15psi(0.1MPa)
Cleaning steps
A Low-pressure flushing of the membrane system with product water.
B Prepare the relevant cleaning solution in the cleaning water tank (prepare it with product water, and control the pH value and temperature of the cleaning solution).
C Open and close the corresponding valves to form a circulating chemical washing pipeline. Start the cleaning pump, inject the cleaning solution into the membrane element pressure vessel, and then the circulation cleaning operation can begin. The time for one cycle of cleaning is (1-2) hours.
D Five minutes after the start of the circulation cleaning, the circulation cleaning is carried out at one-third of the set flow rate. Then, every 10 minutes or so, the circulation flow rate is gradually increased from two-thirds of the set amount to the full flow rate for circulation.
E After the first cleaning is completed, the membrane elements must be thoroughly rinsed with product water and then cleaned with another cleaning solution.
F Real-time detection of the turbidity and pH value of the concentrated water should be carried out. When the turbidity or pH value changes by more than 0.5 units, the cleaning solution should be replenished or reprepared.
G After the cleaning is completed, first low-pressure flush the system, gradually exhaust and increase the pressure until the produced water meets the standards.
H If the membrane element is severely clogged or the water production does not recover significantly after cleaning, the cleaning solution can be re-pumped into the membrane element pressure vessel. Let the cleaning solution remain in the membrane housing to soak the membrane element for 6 to 12 hours, and then carry out circulation cleaning.
I For the cleaning of "multi-stage systems", the rinsing and soaking processes can be carried out simultaneously in all stages. However, the high-flow circulation cleaning process must be carried out in sections to facilitate the control of the circulation flow during each section of the cleaning.
Precautions
A Before the chemical cleaning begins, it should be ensured that the chemicals used to prepare the cleaning solution are fully dissolved and mixed.
B When cleaning the membrane system with "low pressure and high flow", a high pressure drop will occur. It should be noted that the maximum allowable pressure drop for the feed water and concentrated water of a single component is 0.1MPa or 15psi, and for multi-component pressure vessels, the maximum allowable pressure drop is 0.35MPa or 50psi.
C The pH limit value for cleaning: When the pH of the cleaning solution is 1 or 13, it can efficiently clean scale, organic compounds and biofilms. Under the cleaning conditions of this limit pH value, the temperature of the cleaning solution during the cleaning process must be controlled to ensure that the membrane elements are not damaged.
D Limit value of cleaning temperature: During conventional chemical cleaning, the temperature of the cleaning solution should be controlled at (30-35) ℃. When performing extreme cleaning, the temperature of the cleaning solution needs to be controlled within 30℃. Chemical cleaning should be avoided as much as possible in low-temperature environments. It is advisable to keep the temperature of the cleaning solution ≥20℃ to ensure cleaning efficiency and prevent sedimentation.
E After chemical cleaning, before restoring the normal operation of the membrane system, it is necessary to flush the membrane system with the produced water of the system or water that meets the feed water requirements of the membrane system. Only when the residual liquid of the cleaning solution in the system is completely flushed out can the chemical cleaning be considered completed.
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