Method and system for treating coal chemical wastewater in zero-discharge manner
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A coal chemical wastewater and treatment method technology, applied in the direction of oxidation water/sewage treatment, water/sewage treatment, aerobic process treatment, etc., can solve the problem of salt separation and difficulty in the evaporation and crystallization of mixed salt hazardous waste, and achieve the realization of crystallized salt The effect of resource utilization and high promotion value
Inactive Publication Date: 2017-08-11
中海油能源发展股份有限公司北京安全环保工程技术研究院 +2
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[0008] The invention provides a zero-discharge treatment system for coal chemical wastewater. After anaerobic biological desulfurization treatment and ion exchange, the sulfate radicals in the wastewater are completely removed, and the effluent reaches the "Water Quality Standard for Regenerated Water for Circulating Cooling Wat...
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Embodiment 1
[0031] A zero-discharge treatment method for coal chemical wastewater, including anaerobic biological desulfurization, hydrolytic acidification, secondary A / O biochemical treatment, ozone oxidation, aerated biochemical treatment, coagulation sedimentation, activated carbon adsorption, softening, ultrafiltration, and secondary reverse osmosis , ion exchange, membrane concentration and evaporation crystallization treatment process; coal chemical wastewater is converted into hydrogen sulfide from sulfate in wastewater through anaerobic biological desulfurization, and biodegradability of wastewater through hydrolysis and acidification, secondary A / O biochemistry, ozone oxidation, Aeration biochemical treatment, softening, ultrafiltration, two-stage reverse osmosis, Ca 2+ converted to Na + , to ensure the purity of sodium chloride produced by the evaporative crystallization unit, membrane concentration to produce purified water and evaporative crystallization to produce crystalline...
Embodiment 2
[0047] A zero-discharge treatment system for coal chemical wastewater, including sequentially connected buffer pools, anaerobic biological desulfurization units, hydrolytic acidification units, secondary A / O biochemical units, ozone oxidation units, intermediate pools, biological aerated filters, high-efficiency mixing Condensation sedimentation tank, activated carbon adsorption unit, softening unit, ultrafiltration unit, secondary reverse osmosis unit, ion exchange unit, membrane concentration unit and evaporation crystallization unit; purified water produced by secondary reverse osmosis unit, membrane concentration unit and evaporation crystallization unit Discharge into the product water tank; the solid phase product produced by the evaporation crystallization unit is sodium chloride.
[0048] Wherein, the buffer pool is used to adjust the water volume and uniform water quality of waste water produced by different devices; the middle pool is connected with the ozone oxidatio...
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Abstract
The invention relates to a method and a system for treating coal chemical wastewater in a zero-discharge manner, and belongs to the field of technologies for treating water in an environment-friendly manner. The method for treating the coal chemical wastewater in the zero-discharge manner includes carrying out anaerobic biological desulfurization on the coal chemical wastewater to convert sulfate in the wastewater into hydrogen sulfide; carrying out hydrolytic acidification to improve the biodegradability of the wastewater; carrying out secondary A/O (anoxic-oxic) biochemical treatment, ozone oxidation, aeration biochemical treatment, softening, ultra-filtration and secondary reverse osmosis; converting Ca2+ into Na+ by means of ion exchange; generating purified water by means of membrane concentration and generating sodium chloride which is crystal salt by means of evaporation and crystallization. The system for treating the coal chemical wastewater in the zero-discharge manner comprises a buffer pool, an anaerobic biological desulfurization unit, a hydrolytic acidification unit, a secondary A/O biochemical unit, an ozone oxidation unit, an intermediate water pool, an aeration biological filter, a softening unit, an ultra-filtration unit, a secondary reverse osmosis unit, an ion exchange unit, a membrane concentration unit and an evaporation and crystallization unit which are sequentially connected with one another. The method and the system have the advantages that the problems of mixed salt hazardous waste and difficulty in controlling operation can be fundamentally solved by the aid of the method and the system, and the crystal salt can be recycled.
Description
technical field [0001] The invention belongs to the technical field of environmental protection water treatment, and in particular relates to a zero-discharge treatment method and system for coal chemical industry wastewater. Background technique [0002] Coal chemical industry wastewater is a kind of industrial wastewater that is difficult to treat. Coal chemical industry mainly includes coal gasification, liquefaction, dry distillation, tar processing and calcium carbide acetylene chemical industry, etc. Among them, coal gasification wastewater is a type of wastewater with the most complex pollutant components, high concentration, and difficult to be biodegraded. Coal gasification includes medium-temperature gasification and high-temperature gasification. Medium-temperature Lurgi gasification wastewater contains a large amount of toxic and harmful substances such as phenol, ammonia, and tar. Organic pollutants include phenols, polycyclic aromatic compounds, and nitrogen, o...
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