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A zero-discharge method for high-salt and high-hardness wastewater

A high-hardness, zero-discharge technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Energy consumption, easy membrane flux, and the effect of reducing membrane fouling

Active Publication Date: 2018-11-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two patents did not provide a treatment method for the concentrated water problem of membrane distillation, which brought new troubles to the ecological environment

Method used

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  • A zero-discharge method for high-salt and high-hardness wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The water quality characteristics of high-salt and high-hardness wastewater are: wastewater pH7.5, 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.

[0071] Such as figure 1 As shown, the treatment process of this high-salt and high-hardness wastewater is as follows:

[0072] (1) Microfiltration to remove hardness. Firstly, the pH of the high-salt and high-hardness wastewater was adjusted to 10.8 by adding sodium hydroxide, and the reaction time was 60 minutes. Afterwards, a PTFE Gore microfiltration membrane with a membrane pore size of 0.2 μm was used for microfiltration and filtration to remove high-salt and high-pressure wastewater. The hardness in the hardness wastewater can be obtained by microfiltration product water;

[0073] Among them, the Gore microfiltration flux is constant at 500L / m 2 h, under this constant flux, during the continuous 15-day operation, ...

Embodiment 2

[0083] The water quality characteristics of high-salt and high-hardness wastewater are: wastewater pH7.5, 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.

[0084] Such as figure 1 As shown, the treatment process of this high-salt and high-hardness wastewater is as follows:

[0085] (1) Microfiltration to remove hardness. First, the pH of the high-salt and high-hardness wastewater was adjusted to 11 by adding sodium hydroxide, and the reaction time was 40 minutes. Afterwards, a PTFE Gore microfiltration membrane with a membrane pore size of 0.2 μm was used for microfiltration and filtration to remove high-salt and high-pressure wastewater. The hardness in the hardness wastewater is obtained by microfiltration to remove the hard product water;

[0086] Among them, the flux of microfiltration is constant at 400L / m 2 h, under this constant flux, during the continuous 15-day oper...

Embodiment 3

[0096] The water quality characteristics of high-salt and high-hardness wastewater are: wastewater pH 8.5, conductivity 15000μs / cm, COD cr 150mg / L, Na + 3000mg / L, Cl - 3500mg / L, total hardness (CaCO 3 )2200mg / L, dissolved silicon 80mg / L, NH 4 -N3mg / L.

[0097] Such as figure 1 As shown, the treatment process of this high-salt and high-hardness wastewater is as follows:

[0098] (1) Microfiltration to remove hardness. First, the pH of the high-salt and high-hardness wastewater was adjusted to 11 by adding sodium hydroxide, and the reaction time was 50 minutes. Afterwards, a PTFE Gore microfiltration membrane with a membrane pore size of 0.2 μm was used for microfiltration and filtration to remove high-salt and high-pressure wastewater. The hardness in the hardness wastewater can be obtained by microfiltration product water;

[0099] Among them, the flux of microfiltration is constant at 400L / m 2 h, under this constant flux, during the continuous 15-day operation, the op...

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Abstract

The invention relates to the field of industrial wastewater treatment, in particular to a high-salinity high-hardness wastewater zero-discharging method. According to the method, a 'microfiltration and hardness removal + efficient reverse osmosis + membrane distillation + evaporative crystallization' method is adopted to treat high-salinity high-hardness wastewater. Firstly, a microfiltration and hardness removal technology is adopted to remove hardness of the high-salinity high-hardness wastewater, then an efficient reverse osmosis technology is adopted to further concentrate the wastewater without hardness so as to obtain efficient reverse osmosis producing water and efficient reverse osmosis concentrated water, deep concentration is conducted on the efficient reverse osmosis concentrated water through membrane distillation to obtain membrane-distillation producing water and membrane-distillation concentrated water, evaporative crystallization treatment is further conducted on the membrane-distillation concentrated water to enable salt solids in the concentrated water to crystallize out, and centralized drying disposal is performed. The efficient reverse osmosis producing water, the membrane-distillation producing water and evaporative-crystallization producing water produced in the treating process can be reused for a production process, water resources are recycled to the most degree while the problem of wastewater discharging is solved, and zero discharging of high-salinity high-hardness 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-salt and high-hardness wastewater. In particular, it refers to a zero-discharge method for treating high-salt and high-hardness wastewater by using membrane separation technology, and more specifically, it involves a method of "microfiltration to remove hardness + high-efficiency reverse osmosis + membrane distillation + evaporation crystallization" to treat high-salt and high-hardness wastewater Zero emission approach. Background technique [0002] In recent years, with the widespread application of membrane wastewater treatment and reuse devices, the high-salt and high-hardness wastewater produced by petrochemical enterprises, especially reverse osmosis concentrated water, has become a difficult problem to deal with. This high-salt and high-hardness wastewater can neither be discharged nor reused. , causing great distress to the e...

Claims

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Application Information

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