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Zero discharge method of salt-containing wastewater

A salty wastewater, zero-discharge technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of low recycling rate, long process route and high energy consumption

Pending Publication Date: 2021-05-18
上一蓝膜科技(杭州)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a zero-discharge method of saline wastewater, which solves the problems of long process routes, high energy consumption and low recycling rate in the prior art when the saline wastewater is concentrated and reduced. technical problem

Method used

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  • Zero discharge method of salt-containing wastewater

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Experimental program
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Effect test

Embodiment 1

[0027] Raw material water source: Salt production wastewater from a certain enterprise, the amount of wastewater produced is 5m 3 / d. pH value 5.5, CODcr240mg / L, SS 80mg / L, Ca 2+ 1200 mg / L, Mg 2+ 1350mg / L, TDS230000mg / L.

[0028] Pretreatment: After the raw material water is treated through physical, chemical and oxidation processes, the SS is reduced to below 20 mg / L, and the CODcr is reduced to below 50 mg / L.

[0029] Preheating adjustment: the feed water in step (1) is stirred and mixed by air; it is preheated to 58-62°C by heat exchange with the waste flue gas at 80°C in the plant through a tubular heat exchanger.

[0030] Vaporization separation: the feed water in step (2) is heated by heat exchange with the waste flue gas at 80°C in the plant through a tubular heat exchanger, and the temperature is controlled at 65°C; then pervaporation is carried out through the SY-PVLCS-II membrane module Separation of vaporized water to achieve concentration reduction of feed wate...

Embodiment 2

[0036] Source of raw water: high-concentration saline wastewater produced by an enterprise, the amount of wastewater produced is 30m 3 / week. pH value 7.8, CODcr2100mg / L, turbidity 2NUT, TDS210000mg / L.

[0037] Raw material water pretreatment: After physical, chemical and oxidation treatment, CODcr is reduced to below 200 mg / L.

[0038] Preheating adjustment: the feed water in step (1) is preheated to 60-65°C by heat exchange with the 85°C waste hot water generated by the heat exchange and condensation of steam in the plant through a tubular heat exchanger; it is stirred and mixed by a mixer.

[0039] Vaporization separation: the raw material water in step (2) is heated by a metal heater, the temperature is controlled at 68°C, and then the vaporized water is separated by pervaporation through the SY-PVLCS-I type membrane module, so as to realize the concentration and weight loss of the feed water.

[0040] Condensation recovery: the vaporized water separated in step (3) is h...

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Abstract

The invention provides a zero discharge method of salt-containing wastewater. Salt-containing wastewater with impurities can be effectively concentrated and reduced, meanwhile, high-quality water is obtained and recycled, and the zero discharge method of salt-containing wastewater has remarkable environmental protection benefits and economic benefits. The technical method mainly comprises five process units of pretreatment, preheating adjustment, vaporization separation, condensation recovery and concentration evaporation. According to the raw material water pretreatment unit, salt-containing wastewater with certain impurities is subjected to impurity removal through a corresponding pretreatment process, and then feed water capable of entering a vaporization separation unit is obtained; the preheating adjustment unit is used for fully and uniformly mixing the feed water through preheating and stirring effects, so as to ensure that the feed water with stable temperature and water quality required by a subsequent vaporization separation unit is provided; the vaporization separation unit is used for vaporizing the feed water on one side of a pervaporation membrane component to separate vapor water after further accurate heating control, and realizing concentration of the feed water on the other side of the pervaporation membrane component; the condensation recovery unit is used for performing heat exchange on vaporized water separated by pervaporation and circulating cooling water to realize condensation separation and recovery of high-quality water, so as to realize reuse of reclaimed water; and the concentration evaporation unit is used for further concentrating the concentrated water produced by the vaporization separation unit through an evaporation process and finally salifying.

Description

technical field [0001] The invention relates to a method for zero discharge of salty waste water, which belongs to the technical field of environmental protection and resource utilization. Background technique [0002] With the development of new industrial production processes, various pollutants discharged along with production are becoming more and more complex. In the production process of mining, coal mining, thermal power plants, chemical industry and other industries, a certain amount of salty wastewater will be produced. Class wastewater contains a large amount of salt and various impurities with complex components. Such saline wastewater will have a serious impact on the environment if not properly treated or disposed of. In addition, in the production process of these enterprises, a large number of heat sources will be used and more waste heat resources will be generated, such as low-grade waste hot water, waste heat oil, high-temperature flue gas, etc. These wast...

Claims

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Application Information

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IPC IPC(8): C02F1/44C02F1/16
CPCC02F1/16C02F1/448
Inventor 叶舟李金页
Owner 上一蓝膜科技(杭州)有限公司
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