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A zero-discharge method for high-concentration wastewater

A concentrated wastewater, zero-discharge technology, applied in the direction of energy wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve optimization problems, achieve light membrane pollution, solve difficult problems, important environmental benefits and The effect of social benefits

Active Publication Date: 2018-04-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the patent also involves a zero-discharge method for high-concentration wastewater, the zero-discharge process flow of this patent fails to optimize each process, while the zero-discharge process flow in this application fully integrates the advantages of various technologies. completely different from the process flow in the patent

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  • A zero-discharge method for high-concentration wastewater

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Embodiment 1

[0074] The main water quality characteristics of high-concentration wastewater are: wastewater pH7, conductivity 10000μs / cm, COD cr 100mg / L, Na + 2000mg / L, Cl - 2500mg / L, total hardness (CaCO 3 ) 1500mg / L, dissolved silicon 50mg / L, NH 4 -N0mg / L.

[0075] Such as figure 1 As shown, the treatment process of the high-concentration wastewater is as follows:

[0076] (1) Nanofiltration. The high-concentration wastewater enters the nanofiltration unit for nanofiltration treatment, removes multivalent ions such as hardness and some organic matter in the high-concentration wastewater, and obtains nanofiltration product water and nanofiltration concentrated water, and the nanofiltration product water enters step (2) for treatment. Sodium carbonate is added to the nanofiltration concentrated water to precipitate calcium ions to obtain calcium slag. The calcium slag is concentrated and dried, and the supernatant is adsorbed by powdered activated carbon, and then returned to the nan...

Embodiment 2

[0088] The main water quality characteristics of high-concentration wastewater are: wastewater pH7, conductivity 13000μs / cm, COD cr 150mg / L, Na + 2000mg / L, Cl - 2500mg / L, total hardness (CaCO 3 )2000mg / L, dissolved silicon 50mg / L, NH 4 -N0mg / L.

[0089] Such as figure 1 As shown, the treatment process of the high-concentration wastewater is as follows:

[0090] (1) Nanofiltration. The high-concentration wastewater enters the nanofiltration unit for nanofiltration treatment, removes multivalent ions such as hardness and some organic matter in the high-concentration wastewater, and obtains nanofiltration product water and nanofiltration concentrated water, and the nanofiltration product water enters step (2) for treatment. Sodium sulfate is added to the nanofiltration concentrated water to precipitate calcium ions to obtain calcium slag. The calcium slag is concentrated and dried, and the supernatant is adsorbed by granular activated carbon, and then returned to the nanofi...

Embodiment 3

[0102] The main water quality characteristics of high-concentration wastewater are: wastewater pH8, conductivity 15000μs / cm, COD cr 300mg / L, Na + 3000mg / L, Cl - 3500mg / L, total hardness (CaCO 3 )2500mg / L, dissolved silicon 80mg / L, NH 4 -N3mg / L.

[0103] Such as figure 1 As shown, the treatment process of the high-concentration wastewater is as follows:

[0104] (1) Nanofiltration. The high-concentration wastewater enters the nanofiltration unit for nanofiltration treatment, removes multivalent ions such as hardness and some organic matter in the high-concentration wastewater, and obtains nanofiltration product water and nanofiltration concentrated water, and the nanofiltration product water enters step (2) for treatment. Add a mixture of sodium carbonate and sodium sulfate to the nanofiltration concentrated water to precipitate calcium ions to obtain calcium slag. The calcium slag is concentrated and dried, and the supernatant is adsorbed by powdered activated carbon, an...

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Abstract

The invention relates to the field of industrial wastewater treatment, in particular to a zero-discharge method for high-concentration wastewater. The present invention adopts the method of "nanofiltration + high-efficiency reverse osmosis + membrane distillation + evaporation crystallization" to treat high-concentration wastewater. Afterwards, high-efficiency reverse osmosis technology is used to carry out deep concentration treatment on nanofiltration product water, and the obtained high-efficiency reverse osmosis concentrated water is then subjected to membrane distillation deep concentration treatment, and the obtained membrane distillation concentrated water is then subjected to evaporation and crystallization treatment, and the membrane distillation concentrated water The salt solids crystallize out and are concentrated and dried for disposal. Among them, the nanofiltration concentrated water is added with salt for precipitation treatment to obtain calcium slag, and the supernatant after precipitation is adsorbed by activated carbon and mixed with high-concentration wastewater into the nanofiltration unit for recycling treatment. The method of the invention not only solves the problem of high-concentration wastewater discharge, but also recycles water resources to the greatest extent, and basically realizes zero discharge of high-concentration wastewater.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a zero-discharge method for high-concentration wastewater. In particular, it refers to a zero-discharge method for treating high-concentration wastewater by using membrane separation technology, and more specifically, it involves a zero-discharge method for treating high-concentration wastewater by "nanofiltration + high-efficiency reverse osmosis + membrane distillation + evaporation crystallization". Background technique [0002] In recent years, the high-concentration wastewater produced by petrochemical enterprises has become a difficult problem to deal with. The high-concentration wastewater can neither be discharged nor reused, which has brought great troubles to various enterprises. Therefore, it is urgent to find a new separation technology to solve the problem of treatment and discharge of such high-concentration wastewater. [0003] Nanofiltration (NF) is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10
CPCY02W10/33
Inventor 张新妙栾金义平春霞
Owner CHINA PETROLEUM & CHEM CORP
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