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Zero discharge water quality characteristics and influencing factors of desulfurization wastewater
Release time：
2025-12-01 13:42:41
At present, the country is paying more and more attention to environmental protection, and environmental protection standards are becoming more and more strict. The power enterprise industry also has clear regulations on the emission of flue gas pollutants, among which the emission standard concentration limit of SO2 is getting lower and lower. At present, most domestic desulfurization projects use limestone-gypsum wet desulfurization technology, which producesZero discharge of desulfurization wastewater. Although the traditional desulfurization wastewater treatment process has certain treatment capabilities for certain pollutants in wastewater, it cannot remove chlorine from wastewater. ions and salts. As the technical standards for desulfurization wastewater discharge become increasingly stringent,Zero discharge of desulfurization wastewaterThe problem has become an inevitable trend of development and change.
Water quality characteristics and influencing factors of zero discharge of desulfurization wastewater
The harmful substances in desulfurization wastewater are very harmful to the environment and water, so the treatment of desulfurization wastewater should be taken seriously. To achieveZero discharge of desulfurization wastewater, we must first understand the water quality characteristics and influencing factors of desulfurization wastewater.
1. Water quality characteristics of desulfurization wastewater
The composition and concentration of desulfurization wastewater have a great impact on the operating cost management capabilities of the treatment information system, and are key factors affecting the selection and corrosion of treatment technology equipment. Desulfurization wastewater generally has the following characteristics.
(1) The water quality is slightly acidic: the foreign pH value is 5.0~6.5. The domestic pH value is 4.0~6.0.
(2) High concentration of suspended solids, up to tens of thousands mg/L.
(3) COD, fluoride, and heavy metals exceed standards, including Class 1 pollutants such as As, Hg, and Pb.
(4) The salt content is high, containing a large amount of SO42?, SO32?, Cl? plasma, and the mass fraction of Cl? is about 0.04.
2. Factors affecting the quality of desulfurization wastewater
The quality and quantity of desulfurization wastewater are mainly affected by factors such as the quality of coal combustion, the quality of limestone, the design and operation of the desulfurization technology system, the control and management equipment of pollutants in front of the desulfurization tower, and the dehydration equipment. Figure 1 is a relationship diagram of the main factors affecting the quality of desulfurization wastewater.
Coal is the main pollutant source of desulfurization wastewater. Different types of coal will affect the discharge of desulfurization wastewater: the combustion of high-sulfur coal will produce more problematic sulfur dioxide, which will increase the amount of desulfurization agent and increase the discharge of wastewater from the desulfurization process of the enterprise; the combustion of high-chlorine coal will increase the chlorine content in the flue gas, which in turn can increase the chlorine content in my country's desulfurization slurry. In order to prevent corrosion of the desulfurization system and maintain the chloride ion concentration in the desulfurization slurry at a certain level, the removal rate of the desulfurization slurry will be increased to desulfurize the desulfurization slurry. Wastewater discharge increases.
Conventional desulfurization wastewater treatment processes can no longer meet the current environmental protection situation and market needs of enterprises. Zero discharge of desulfurization wastewater has become a social development trend;
The zero-discharge steam evaporation technology for desulfurization wastewater occupies a large area, has high investment and operation and management costs, and is difficult to widely publicize and promote enterprise applications in the market;
The zero-discharge flue gas evaporation process management system for desulfurization wastewater can be simple, but the cost of investment and operation time is high. It will become the mainstream media technology for enterprises in the future zero-discharge desulfurization wastewater market.
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