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Method and system for synergic production of fresh water from sewage plant secondary effluent and strong brine

A technology for secondary effluent and concentrated brine, which is applied in multi-stage water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc. It can solve the problems of secondary pollution of concentrated brine, easy membrane fouling, and high energy consumption in operation. Achieve the effects of avoiding environmental impact, improving membrane flux, and achieving zero emissions

Inactive Publication Date: 2016-06-15
QINGDAO TECHNOLOGICAL UNIVERSITY
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Problems solved by technology

[0004] Aiming at the problems of high energy consumption, easy membrane pollution and secondary pollution of concentrated brine produced by seawater desalination in the advanced treatment process used in the existing sewage regeneration and reverse osmosis process, the invention provides a secondary sewage treatment plant A method for synergistic production of fresh water from effluent and concentrated brine, which uses forward osmosis membrane and reverse osmosis membrane separation technology to combine sewage treatment and seawater desalination to synergistically produce fresh water

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  • Method and system for synergic production of fresh water from sewage plant secondary effluent and strong brine

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Embodiment Construction

[0022] The system of the secondary effluent of the sewage plant and the concentrated brine to produce fresh water in cooperation of the present invention, such as figure 1 As shown, it includes a pretreatment tank 1, a forward osmosis separation tank 2, a desalinated water recovery tank 3 and a concentrated water treatment tank 4. A vertical microfiltration membrane 5 is arranged in the pretreatment tank 1, and the microfiltration membrane 5 divides the pretreatment tank 1 into left and right sides, a water inlet 8 is arranged on the upper left side, and a raw material liquid pipe 9 is arranged on the bottom right side. The forward osmosis separation tank 2 is provided with a vertical forward osmosis membrane 6, and the forward osmosis membrane 6 divides the forward osmosis separation tank 2 into a raw material liquid side and a permeate side, and the bottom of the raw material liquid side is connected to the raw material liquid pipe 9 , the raw material liquid pipe 9 is conne...

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Abstract

The invention provides a method and system for synergic production of fresh water from sewage plant secondary effluent and strong brine. The method comprises the following phases: (1) suction and cross flow filtration are carried out for secondary effluent of the sewage plant to pass through a micro-filtration membrane, and suspensions are removed; (2) pretreated secondary effluent flows to one side of a forward osmosis membrane and is used as a feed solution, strong brine generated from seawater desalination flows to the other side of the forward osmosis membrane and is used as a draw solution, and the secondary effluent is condensed and strong brine is diluted; (3) diluted strong brine passes through a reverse osmosis membrane to form fresh water, and diluted strong brine is condensed till the concentration is equal to the salt content of seawater and discharged to sea; (4) a ferric salt agent for removing phosphate is added into the condensed secondary effluent, after phosphate removal, denitrification treatment is carried out for nitrogen removal; the system comprises a pretreatment pool, a forward osmosis separation pool, a desalted water recycling tank and a concentrated water treatment pool. A fresh water resource can be extracted from the secondary effluent, in order to realize zero discharge of the waste water; strong brine discharged from seawater desalination can be utilized, in order to avoid influence of discharge on marine site.

Description

technical field [0001] The invention relates to a method for producing fresh water by using forward osmosis membrane and reverse osmosis membrane technology, using concentrated brine from a seawater desalination plant and secondary effluent from a sewage treatment plant as raw materials, and belongs to the technical field of sewage treatment. Background technique [0002] In many coastal cities, most of the secondary effluent from urban sewage treatment plants is directly or indirectly discharged after advanced treatment reaches the first-level A or first-level B standard of the "Pollutant Discharge Standards for Urban Wastewater Treatment Plants" (GB18918-2002). Entering the sea, on the one hand, will cause potential pollution to the offshore marine environment, and on the other hand, it will also cause a great waste of fresh water resources. The advanced treatment methods of sewage mainly include coagulation / sedimentation / filtration method, ultrafiltration / reverse osmosis ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F9/14C02F101/16
CPCY02A20/131C02F9/00C02F1/001C02F1/441C02F1/445C02F1/52C02F3/28C02F2101/105C02F2101/16
Inventor 程丽华倪福祥毕学军刘长青
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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