High-concentration wastewater zero-discharging method

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: 2015-12-30
CHINA PETROLEUM & CHEM CORP +1
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  • 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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  • High-concentration wastewater zero-discharging method

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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 high-concentration wastewater zero-discharging method. Accoridng to the method, a 'nanofiltration + efficient reverse osmosis + membrane distillation + evaporative crystallization' method is adopted to treat high-concentration wastewater. Firstly, nanofiltration is adopted to remove hardness, multivalent ions and parts of organic matter in the high-concentration wastewater so as to obtain nanofiltration producing water and nanofiltration concentrated water, then an efficient reverse osmosis technology is adopted to conduct deep concentration treatment on the nanofiltration producing water, deep concentration treatment is conducted on the obtained efficient reverse osmosis concentrated water through membrane distillation to obtain membrane-distillation concentrated water, further evaporative crystallization treatment is performed to enable salt solids in the membrane-distillation concentrated water to crystallize out, and centralized drying disposal is performed, wherein salt is added into the nanofiltration concentrated water to perform precipitation treatment so as to obtain calcium residues, supernate obtained after precipitation is subjected to activated carbon adsorption and then is mixed with the high-concentration wastewater, and the mixed liquid is fed into a nanofiltration unit for circular treatment. By means of the high-concentration wastewater zero-discharging method, water resources are recycled to the most degree while the problem of high-concentration wastewater discharging is solved, and zero discharging of high-concentration wastewater is basically achieved.

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 Applications(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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