Method and device for zero-emission treatment of high-hardness waste water containing sulfate

A sulfate and zero-emission technology, applied in chemical instruments and methods, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of high operating costs and large investment, achieve investment and operation savings, and reduce the amount of residual wastewater , The effect of increasing the amount of recycled water

Active Publication Date: 2015-01-21
山东泰禾环保科技股份有限公司
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  • Summary
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  • Application Information

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Problems solved by technology

The traditional method of zero emission is to use reverse osmosis to concentrate the salt content of water to about 8%, and then evaporate and concentrate. However, the in...

Method used

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  • Method and device for zero-emission treatment of high-hardness waste water containing sulfate
  • Method and device for zero-emission treatment of high-hardness waste water containing sulfate

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1 (adopt milk of lime to remove sulfate group)

[0029] like figure 1 As shown, at first the concentration of 500ppm sulfuric acid radical wastewater flows into the raw water pool 1, transported by the raw water pump 2, and sodium hydroxide and sodium carbonate are added with the first alkali adding pump 3 and the second alkali adding pump 4 to reach the first reaction pool After 5, stir and react for 10-30 minutes to form calcium carbonate and magnesium hydroxide precipitates. After electrocoagulation 6, large flocs are formed and reach the first sedimentation tank 7 for precipitation. The supernatant enters the filter tank 8 for filtration to further remove the suspended The filtered clean water enters the first clean water tank 9, is pressurized by the first booster pump 10, enters the sand filter 11 for filtration, and then passes through the ion exchanger 12 to further remove calcium and magnesium ions in the water, and the treated clean water enters the...

Embodiment 2

[0030] Embodiment 2 (adopt freezing method to remove sulfate radical)

[0031] The difference between this embodiment and embodiment 1 is that the method for removing sulfate radicals is different, and other steps are identical.

[0032] like figure 2 Shown, the step that present embodiment removes sulfate group is as follows:

[0033] The nanofiltration concentrated water mainly contains sodium sulfate, and the concentration can reach more than 50,000 ppm. The high-concentration sodium sulfate solution is initially cooled by the heat exchanger 28 and then cooled by the refrigeration device 29. After cooling, it enters the crystallization tank 30, crystallizes to form Glauber's salt, and the mother liquor after crystallization enters clear water The tank 31 enters the nanofiltration water tank 24 after being heated by the heat exchanger 28, mixes with the nanofiltration product water, and enters the membrane concentration device 26 to concentrate after being pressurized by t...

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Abstract

The invention belongs to the field of waste water treatment and reclaimed water reuse, in particular to a method and a device for the zero-emission treatment of high-hardness waste water containing sulfate. The method for the zero-emission treatment of high-hardness waste water containing sulfate comprises the following steps: 1) sequentially substituting calcium and magnesium ions in waste water into sodium ions by a double-alkali process and an ion exchange process and simultaneously removing most alkalinity so as to promote sulfate radicals and chlorine ions to be the main components of rest anions in water and promote sodium ions to be the main component of cations; 2) concentrating waste water obtained in step 1) through reverse osmosis and reclaiming produced water; 3) separating and concentrating concentrated water treated by reverse osmosis in step 2) through nanofiltration so as to obtain nanofiltered concentrated water of which the main component is sodium sulfate and nanofiltered produced water of which the main component is sodium chloride; 4) after concentrating the produced water nanofiltered in step 3) through reverse osmosis or positive osmosis, evaporating and concentrating; 5) removing sulfate radicals from the concentrated water nanofiltered in step 3). The concentrating times of waste water is increased as much as possible, and the evaporating quantity of waste water is reduced.

Description

technical field [0001] The invention belongs to the field of waste water treatment and reclaimed water reuse, in particular to a method and device for zero discharge treatment of waste water containing sulfate and high hardness. Background technique [0002] In the field of wastewater treatment, discharge requirements are becoming more and more stringent, and some areas do not even allow discharge, which requires enterprises to achieve zero discharge. The traditional method of zero emission is to use reverse osmosis to concentrate the salt content of water to about 8%, and then evaporate and concentrate. However, the investment and operation cost of evaporation and concentration equipment are large, which has become a restrictive factor for the promotion of zero emission technology. [0003] Therefore, there is a need for a method and device that can increase the concentration multiple of waste water as much as possible, reduce the evaporation of waste water, and achieve zer...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F9/06
CPCC02F1/04C02F1/42C02F1/441C02F1/442C02F1/5236C02F9/00C02F2301/08
Inventor 房军贤
Owner 山东泰禾环保科技股份有限公司
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