Seawater desalination method for integrated membrane process
An integrated membrane and seawater technology, applied in the field of water desalination, can solve problems such as high desalination rate, achieve the effect of improving electrical conductivity, process energy consumption and operation stability, and improving water conservancy
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Embodiment 1
[0039] For the pretreatment unit, seawater raw water 1 first enters the coagulation and sedimentation tank 2 through the action of the lift pump, and enters the sedimentation tank 3 after adding conventional coagulation and flocculation agents such as polyacrylamide for precipitation and deturbidity. Acidification adjustment is carried out to reduce the pH to between 6.5-7.0. The clean sea water is further filtered by the booster pump into the sand filter 4. The sand filter 4 is composed of two stages of sand filters connected in series. The filter medium used is quartz sand with particle sizes of 1.0-2.0mm and 0.5-1.0mm respectively. In front of the first-stage sand filter, strengthen the oxidant sodium hypochlorite to sterilize and remove algae online, and add the reducing agent NaHSO online between the second-stage sand filter and the ultrafiltration membrane 5 3 , Eliminate residual oxidants and protect downstream ultrafiltration membranes.
[0040] The clear sea water in...
Embodiment 2
[0052] In this embodiment, the operating parameters of the NF devices of the pretreatment and primary desalination units remain unchanged, and the flow and pressure conditions of the SEDR device are also the same as in Embodiment 1. Only the voltage and current of each stage of the SEDR device are changed. Reduce the desalination rate of the SEDR unit, but still maintain the salinity of the produced water within the range of better drinking water quality. The operating parameters, power consumption, and water quality parameters of the SEDR device in embodiment 2 are as shown in table 3:
[0053] Table 3 SEDR seawater desalination operating parameters and influent and effluent water quality
[0054]
[0055] Compared with Example 1, in Example 2, by appropriately reducing the operating voltage and current of each stage of the SEDR device, the fresh water conductivity is 410 μS / cm, the TDS is 241 mg / L, the desalination rate is 99.26%, and the power consumption per ton of wate...
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