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Forward osmosis draw fluid recycling method, wastewater treatment method and treatment device

A technology of recycling and treatment methods, applied in the direction of osmosis/dialysis water/sewage treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of limited types of draw liquid, poor operation safety, and high energy consumption. To achieve the effect of prolonging the continuous and stable operation time, low operation cost and low energy consumption

Inactive Publication Date: 2016-09-07
北京新源智慧水务科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patents all use forward osmosis coupling reverse osmosis, multi-effect evaporation, membrane distillation technology, and freeze crystallization technology to treat wastewater or solutions. In these technologies, there are defects such as limited types of draw liquid, poor operation safety, and high energy consumption.

Method used

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  • Forward osmosis draw fluid recycling method, wastewater treatment method and treatment device

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Experimental program
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Effect test

Embodiment 1

[0047] The water quality characteristics of the high-salt wastewater to be treated (oilfield fracturing fluid wastewater of a certain high-salt wastewater) are: wastewater pH 8.35, electrical conductivity about 20000μs / cm, CODcr 8350mg / L, Cl - 43500mg / L, oil: 80mg / L, suspended matter: 1000mg / L.

[0048] The forward osmosis membrane module used is a cellulose acetate plate-and-frame membrane module; the ion-exchange membrane is a styrene-divinylbenzene copolymer membrane plate-and-frame membrane module, and the membrane pore diameter is 0.2 μm.

[0049] The pretreatment steps include high-efficiency oil separation and air flotation tanks to remove oil, and high-efficiency suspension sedimentation tanks to remove suspended matter.

[0050] The drawing solution is magnesium sulfate solution. During the operation of the wastewater treatment unit, under the operating conditions of the forward osmosis process: feed liquid side, wastewater pH 8.35, wastewater temperature 25°C, membra...

Embodiment 2

[0054] The water quality characteristics of the high-salt wastewater to be treated (reverse osmosis concentrated water from sewage treatment plant): wastewater pH8, electrical conductivity around 20000μs / cm, CODcr 15000mg / L, Ca 2+ About 30mg / L, Mg 2+ About 20mg / L, soluble silicon about 50mg / L, NH 3 -N 1000mg / L or so. This water is pretreated landfill leachate water.

[0055] The forward osmosis membrane module used is a cellulose acetate plate-and-frame membrane module; the ionic membrane module used is a styrene-divinylbenzene copolymer membrane plate-and-frame membrane module, and the membrane pore diameter is 0.2 μm.

[0056] The pretreatment steps include high-efficiency suspension sedimentation tanks to remove suspended solids.

[0057] The drawing solution is magnesium sulfate solution. During the operation of the wastewater treatment unit, under the operating conditions of the forward osmosis process: feed liquid side, wastewater pH 8, wastewater temperature 25°C, me...

Embodiment 3

[0061] The high-salt wastewater to be treated belongs to the reverse osmosis concentrated water of the coal chemical industry. The water quality characteristics: pH 8.0, TDS23935mg / L, CODcr 300mg / L, Cl - 13812mg / L, Na + 8749mg / L, HCO 3 - 882mg / L, Ca 2+ 399mg / L.

[0062] The forward osmosis membrane module used is a cellulose acetate plate-and-frame membrane module; the ionic membrane module used is a styrene-divinylbenzene copolymer membrane plate-and-frame membrane module, and the membrane pore diameter is 0.2 μm.

[0063] Pretreatment steps include high-efficiency sedimentation tanks to remove suspended solids.

[0064] The draw solution is calcium sulfate solution. During the operation of the wastewater treatment device, under the operating conditions of the forward osmosis process: feed liquid side, wastewater pH8, wastewater temperature 25 ° C, membrane surface flow rate 0.5m / s, forward osmosis membrane flux maintains at 5L / m 2 About h; under the operating condition...

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Abstract

The invention provides a recycling method of a forward osmosis draw fluid. According to the invention, diluted draw fluid produced during a forward osmosis process is subjected to a concentration treatment with an ion exchange membrane; and the concentrated draw fluid is recycled and reused in the forward osmosis process. The invention also provides a wastewater treatment method and a wastewater treatment device. According to the recycling method, the wastewater treatment method and the treatment device provided by the invention, a combination of forward osmosis and ion exchange membrane concentration is adopted. No additional pressure or small additional pressure is needed during the forward osmosis process and the ion exchange membrane concentration process. The method is simple and feasible, and has the advantages of easy operation and low energy consumption. Also, membrane pollution of the forward osmosis process and the ion exchange membrane concentration process is low, and continuous stable operation times of the two processes are prolonged. With the method, a large amount of pure product water can be obtained, and wastewater recycling rate is improved to a maximal extent. The methods and the device bring important environmental benefit.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a recycling method for forward osmosis drawing liquid, a wastewater treatment method and a treatment device. Background technique [0002] Forward osmosis (FO) is a membrane separation process driven by osmotic pressure, that is, water spontaneously diffuses from a region of higher water chemical potential (low osmotic pressure side) to a region of lower water chemical potential (higher water chemical potential) through a selectively semipermeable membrane. osmotic pressure side) process. The driving force of the forward osmosis process is the osmotic pressure difference between the draw solution (drive solution) and the raw material solution, and no external pressure is required as the driving force. Compared with the reverse osmosis process, forward osmosis has the following advantages: less membrane pollution, no need for external pressure, low energy consumptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F9/02
CPCC02F1/44C02F1/40C02F1/445C02F1/5209C02F9/00C02F2001/5218C02F2301/08
Inventor 周敏王旭高涛张旭兵罗海泉韦兰春
Owner 北京新源智慧水务科技有限公司
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