A forward osmosis membrane bioreactor/reverse osmosis combined fresh water increment method

Abstract

The invention discloses a forward osmosis membrane bioreactor / reverse osmosis combined fresh water increasing method, which comprises the following steps: setting the first-stage and second-stage forward osmosis membrane components in the forward osmosis membrane bioreactor, after pretreatment The sewage water flow B is input into the forward osmosis membrane bioreactor, the pretreated seawater flow A is input into the first-stage forward osmosis membrane module, and the output water flow C is boosted by the booster pump and then input into the reverse osmosis membrane module for liquid Membrane separation, the output product water flow D becomes finished fresh water after being sterilized by the sterilizer, and the remaining concentrated brine flow E is input to the second-stage forward osmosis membrane module for infiltration, and the output water flow F is discharged to the sea, and is set in the forward osmosis membrane biological The aerator at the bottom of the reactor is used for aeration. The method of the invention improves the water recovery rate of the reverse osmosis desalination system and reduces system energy consumption; reduces the sea discharge concentration of seawater desalination concentrated brine; improves the flux of the forward osmosis membrane, prolongs the service life of the membrane, and improves the system water recovery rate.

Description

technical field [0001] The invention belongs to the field of seawater desalination and water reuse, in particular to a forward osmosis membrane bioreactor / reverse osmosis combined fresh water increment method Background technique [0002] The increasing demand for water, the increasingly normal climate drought and the continuous deterioration of the water environment have caused a serious shortage of fresh water resources. The development of unconventional water sources is being studied and put into practice by countries all over the world. With the rapid development of our country's economy and society, the utilization of unconventional water sources has attracted widespread attention from all walks of life. For coastal cities and island areas, the development and utilization of unconventional water sources mainly include seawater desalination, sewage reuse and rainwater utilization. Due to various degrees of climate anomalies in many parts of the world in recent years, th...

AI Technical Summary

Problems solved by technology

Since the separation unit of the forward osmosis membrane bioreactor uses a forward osmosis membrane with a lower molecular weight cut-off than the ultra (micro) membrane, the two problems of forward osmosis membrane fouling and water recovery are the main obstacles to be overcome in its application

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