A biochemical and advanced treatment method for coking wastewater
A technology for coking wastewater and advanced treatment, which is applied in the field of water treatment and can solve the problems of dangerous storage and use, large amount of chemical agents, and difficulty in meeting discharge standards.
Active Publication Date: 2021-08-20
ANGANG STEEL CO LTD
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Problems solved by technology
Although the physical method has simple equipment, low investment and convenient operation, its removal effect is very limited.
The chemical oxidation method has obvious removal effect and can convert organic matter into inorganic matter, but the amount of chemical agent is large, and there are certain risks in transportation, storage and use.
[0005] "Liaoning Provincial Comprehensive Wastewater Discharge Standard" (DB 21 / 1627-2008) stipulates that the maximum allowable discharge concentration of COD in wastewater is 50mg / L, and the traditional two-stage coking wastewater treatment process is difficult to meet the discharge standard
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[0028] A biochemical and advanced treatment method of coking wastewater according to the present invention comprises the following steps:
[0029] 1) The biochemical treatment process adopts an anaerobic-anoxic-membrane aerated biofilm combination process. The specific process is:
[0030] The pretreated coking wastewater enters the anaerobic tank, and the coking wastewater reacts biochemically with the activated sludge in the anaerobic tank, using anaerobic bacteria to degrade some harmful substances in the coking wastewater, while improving the biodegradability of the coking wastewater;
[0031] The effluent from the anaerobic tank flows into the anoxic tank, and the coking wastewater undergoes a biochemical reaction with the activated sludge in the anoxic tank to further degrade and remove ammonia nitrogen and COD in the wastewater;
[0032] The effluent from the anoxic tank flows into the membrane aeration biofilm reaction tank. The membrane aeration biofilm adopts hollow ...
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The invention relates to a biochemical and advanced treatment method of coking wastewater. The biochemical treatment process adopts anaerobic-anoxic-membrane aeration biofilm combined process, and the advanced treatment process adopts coke powder filtration-ozone catalytic oxidation-anammox combined process ;Outlet water quality indicators: COD≤50mg / L, ammonia nitrogen≤5mg / L, volatile phenol≤0.2mg / L, total cyanide≤0.1mg / L. In the present invention, the pretreated coking wastewater is subjected to biochemical treatment and advanced treatment to effectively remove ammonia nitrogen and refractory organic pollutants, strengthen the water quality of the effluent, reduce the harm of coking wastewater to the environment, and make the water quality of the coking wastewater after treatment reach Requirements of relevant standards.
Description
technical field [0001] The invention relates to the technical field of water treatment, in particular to a biochemical and advanced treatment method for coking wastewater. Background technique [0002] The iron and steel industry is a pillar industry of my country's national economy. With the continuous development of the industry, people pay more and more attention to the problem of environmental pollution, especially the standard discharge and reuse of coking wastewater has become a research hotspot. Coking wastewater is produced in the process of coal coking and refining of chemical products. Its components are complex, fluctuate widely, and are toxic and harmful. Most of the treatment methods currently used are divided into two levels. The first level treatment refers to the recycling of pollutants in high-concentration wastewater, including ammonia water dephenolization, ammonia water distillation, and final cold water decyanation. Secondary treatment mainly refers to ...
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IPC IPC(8): C02F9/14C02F101/16C02F101/30
CPCC02F1/725C02F1/78C02F3/30C02F2101/16C02F2101/30
Inventor 胡绍伟陈鹏李方剑王飞刘芳
Owner ANGANG STEEL CO LTD