Zero discharge method of desulfurization wastewater
Release time：
2025-12-01 13:42:10
Zero discharge of desulfurization wastewatermethod
Industrial wastewater refers to the wastewater, sewage and waste liquid generated during the industrial production process, which contains industrial production raw materials, intermediate products and products lost with water, as well as pollutants generated during the production process.
With the rapid development of industry, the type and quantity of wastewater have increased rapidly, and the pollution of water bodies has become increasingly widespread and serious, bringing great harm to human health and safety: if the toxicity is high, it will lead to the death or even extinction of aquatic animals and plants. Contaminate groundwater, thus contaminating crops; seep into soil, causing soil pollution. Affecting the growth of plants and microorganisms in the soil; some industrial wastewater also has an unpleasant odor and pollutes the air.
Zero discharge of desulfurization wastewater-Three specific wastewater treatments
1. Coal-fired power plantZero discharge of desulfurization wastewaterand processing technology
Power plant desulfurization wastewater treatment process: desulfurization wastewater → wastewater pool → wastewater pump → pH neutralization tank → sedimentation tank → flocculation tank → clarification tank → effluent tank → effluent pump → standard discharge
The desulfurization wastewater treatment system includes three parts: wastewater treatment, dosing, and sludge treatment. The wastewater treatment system mainly consists of wastewater tanks, triple boxes, clarifiers, mud pumps, water outlets, clean water pumps, fans, dehydrators and other equipment. In addition to large amounts of Cl- and Mg2+, impurities in desulfurization wastewater also include: fluoride, etc.; heavy metal ions, such as Cu2+, Hg2+, etc.; insoluble CaSO4 and fine dust. In order to meet wastewater discharge standards, corresponding wastewater treatment devices are required.
2. Chemical wastewater
First, transform the production process and equipment to reduce pollutant emissions, eliminate wastewater discharge, and carry out comprehensive utilization and recycling; the treatment level of wastewater to be discharged should be selected based on water quality and requirements.
The treatment mainly separates suspended solids, colloids, floating oil or heavy oil in water. Water quality and quantity adjustment, natural sedimentation, floating oil separation and other methods can be used.
Secondary treatment is mainly to remove biodegradable organic dissolved substances and some colloidal substances, and to reduce biochemical oxygen demand and part of chemical oxygen demand in wastewater. Biological treatment is usually used. A considerable amount of COD remains in the wastewater after biological treatment. Sometimes it has a strong color, aroma, and taste, or due to high environmental hygiene standards, a three-level treatment method is required for further purification.
Tertiary treatment mainly removes organic pollutants and dissolved inorganic pollutants that are difficult to biodegrade in wastewater. Commonly used methods include activated carbon adsorption and ozone oxidation, and ion exchange and membrane separation technologies can also be used. Different treatment methods can be selected for various chemical wastewater according to the requirements of different water quality, water quantity and external drainage water quality after treatment.
3. Heavy metal wastewater
The treatment of heavy metal wastewater can usually be divided into two categories:
One is to convert dissolved heavy metals in wastewater into insoluble metal compounds or elements, and then remove them from the wastewater through precipitation and floating. Applicable methods include neutralization precipitation method, sulfide precipitation method, flotation separation method, electrolytic precipitation (or flotation) method, diaphragm electrolysis method, etc.;
The second is to concentrate and separate heavy metals in wastewater without changing the chemical form. Applicable methods include reverse osmosis, electrodialysis, evaporation and ion exchange. Depending on the quality and quantity of wastewater, these methods should be used in multiple bands or in combination.
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