Zero discharge method for desulfurization waste water

A desulfurization wastewater and zero-discharge technology, applied in chemical instruments and methods, water/sewage treatment, heating water/sewage treatment, etc., can solve problems such as environmental pollution, water not reused, etc., to improve operational stability, less Effects of sludge, reduction of water volume and pollutants

Inactive Publication Date: 2016-10-26
武汉尚远环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The disadvantages of the above-mentioned technical process are: 1) The water is not reused; 2) The desulfurization wastewater discharged after simple treatment contains salt content and other pollutants such as heavy metal ions, calcium and magnesium hardness ions, silicon, COD and other pollutants. Discharge into the environment, polluting the environment in new ways

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for zero discharge of desulfurization wastewater, comprising the steps of:

[0021] A. Pretreatment: add coagulant to the desulfurization wastewater to flocculate and precipitate suspended matter, and add acid to adjust the pH to 6-8;

[0022] B. Chemical reaction treatment: chemical reaction is carried out by adding medicine to the separated wastewater, so that the ionic pollutants in the wastewater react to form floc particles suspended in the water and soften the wastewater, so as to obtain the wastewater treated by chemical reaction;

[0023] C. Separation treatment: separate the solid particles in the wastewater treated by chemical reaction;

[0024] D. Purification and filtration treatment: sequentially pass through quartz sand filter, microfiltration and nanofiltration to remove impurities in the leaching solution, and then use selective adsorption function membrane to further process by membrane filtration. The adsorption function membrane is a reverse ...

Embodiment 2

[0028] The difference from Example 1 is that the adsorption function membrane is a nanofiltration membrane, the operating pressure of the membrane is controlled at 2-3 MPa, and the operating temperature is controlled at 30-40°C.

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PUM

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Abstract

The invention discloses a zero discharge method for desulfurization waste water. The method comprises the steps of pretreatment, chemical reaction treatment, separation treatment, purification filter treatment, washing of a membrane by using tap water, membrane distillation crystallization, and the like. The method removes heavy metal ions, hardness ions of calcium and magnesium, silicon, COD and other pollutants before reverse osmosis of concentrated water, a main engine for reverse osmosis of concentrated water is protected and can run at a high recovery rate, water and pollutants entering a crystallizing evaporator are reduced, meanwhile, the salt concentration of water is increased, and the operational stability of the crystallizing evaporator is improved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a zero-discharge method for desulfurization wastewater. Background technique [0002] Existing technologies for desulfurization wastewater treatment have the following deficiencies: [0003] 1. Wet flue gas desulfurization is a mature and efficient desulfurization process for sulfur air pollution treatment, which is widely used in various flue gas desulfurization devices; however, wet desulfurization will produce desulfurization wastewater, which contains a large amount of suspended solids, Calcium and magnesium hardness, active silicon, heavy metals, COD, high salt content and other special substances; at this stage, desulfurization wastewater is basically discharged after simple treatment, which wastes water resources and has a great impact on the environment; therefore, advanced treatment And further reuse of desulfurization wastewater until zero disc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F9/00C02F1/001C02F1/08C02F1/441C02F1/444C02F1/52
Inventor 朱书泉
Owner 武汉尚远环保股份有限公司
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