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Method for treatment of salt-containing wastewater by forward osmosis membrane distillation

A forward osmosis membrane, salt-containing wastewater technology, applied in water/sewage treatment, chemical instruments and methods, textile industry wastewater treatment, etc. The effect of low cost and reduced water quality requirements

Active Publication Date: 2019-12-31
XINZHONGTIAN ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, the application of forward osmosis membranes has not been fully promoted. The draw solution of forward osmosis is diluted during the working process and must be concentrated and recovered to maintain the osmotic pressure. The regeneration of the draw solution is one of the most difficult problems to solve at present. one

Method used

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  • Method for treatment of salt-containing wastewater by forward osmosis membrane distillation
  • Method for treatment of salt-containing wastewater by forward osmosis membrane distillation
  • Method for treatment of salt-containing wastewater by forward osmosis membrane distillation

Examples

Experimental program
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Effect test

Embodiment 1

[0048] 1. Characteristics of high-salt wastewater

[0049] This technical solution concentrates salt substances and recycles high-salt wastewater. In this embodiment, the high-salt wastewater is formed after conventional treatment such as removing suspended solids. The characteristic parameters of water quality are as follows: pH 8, COD 35072mg / L, Conductivity 7547μs / cm, total phosphorus 1351mg / L, NH 3 -N 94mg / L. The salt substance in the high-salt wastewater is mainly sodium chloride, and the content of the salt substance is 3.4w.t%.

[0050] Among them, COD is the abbreviation of Chemical Oxygen Demand, which refers to chemical oxygen demand, which refers to the amount of oxidant consumed when treating water samples with strong oxidants. It is an index indicating the amount of reducing substances in water. The reducing substances in water mainly refer to organic matter. COD is an indicator to measure the content of organic matter in water, NH 3 -N is the ammonia nitrogen...

Embodiment 2

[0067] The present embodiment is basically the same as Example 2, the difference is: the water quality characteristic parameters of high-salt wastewater, the characteristic parameters are as follows: pH 7.5, COD 27891mg / L, conductivity 5147μs / cm, total phosphorus 587mg / L, NH 3 -N 156mg / L. The salt substance in the high-salt wastewater is mainly sodium sulfate, and the content of the salt substance is 3.0w.t%. The characteristic parameters of the final product and the intermediate product are compared as shown in Table 2. In this example, the water recovery rate was 94.56%.

[0068] Table 2:

[0069] testing object COD (mg / L) Conductivity (μs / cm) Total phosphorus (mg / L) NH 3 -N (mg / L)

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Abstract

Belonging to the field of chemical wastewater treatment, the invention relates to a method for treatment of salt-containing wastewater, in particular to a method for treatment of salt-containing wastewater by forward osmosis membrane distillation. The method utilizes high-salt concentration water generated by membrane distillation as a draw solution in forward osmosis, combines forward osmosis andmembrane distillation, recycles water resources and salt at the same time, and realizes regeneration of the draw solution in the forward osmosis process. The method provided by the invention can recycle water resources and salt in the high-salt wastewater while treating high-salt wastewater, the two processes are carried out simultaneously, and promote each other. The technical scheme provided bythe invention can be applied to treatment of high-salt wastewater and the like to realize zero-pollution emission and resource recycling.

Description

technical field [0001] The invention belongs to the field of chemical wastewater treatment, and relates to a method for treating high-concentration saline wastewater, in particular to a method for treating saline wastewater by using forward osmosis membrane distillation. Background technique [0002] Printing and dyeing wastewater is a general term for various wastewater produced by processing fiber materials in printing and dyeing factories, wool spinning factories, knitting factories, etc., which pollutes the environment very seriously. Printing and dyeing wastewater contains a large amount of organic substances such as aminos and phenols, as well as a large amount of inorganic salts such as sodium chloride and sodium sulfate, and even the content of inorganic salts in printing and dyeing wastewater can reach more than 3.0w.t%. This type of wastewater has low biodegradability and is difficult to treat. However, if a large amount of electrolytes and water resources in print...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/30C02F103/30
CPCC02F1/445C02F1/08C02F2101/30C02F2103/30
Inventor 阳杨毛小英林辉荣赵静倾彩霞左姣
Owner XINZHONGTIAN ENVIRONMENTAL PROTECTION
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