Device and method for treating high-ammonia and high-nitrogen coking wastewater

Abstract

The invention provides a device and method for treating high-ammonia and high-nitrogen coking wastewater. The device comprises a water inlet tank, a water inlet pipe, an intermediate tank, an anaerobic SBR reactor, a continuous flow integrated type anaerobic ammonia oxidation bio-membrane reactor, a water outlet tank and water outlet pipes and is characterized in that the water inlet tank is connected with a water inlet lifting pump, the water outlet pipeline of the water inlet lifting pump is connected with the anaerobic SBR reactor through the water inlet pipe, the water outlet pipeline of the anaerobic SBR reactor is connected with the intermediate tank, the water outlet pipe of the intermediate tank is connected with an intermediate lifting pump, the water outlet pipe of the intermediate lifting pump is connected with the continuous flow integrated type anaerobic ammonia oxidation bio-membrane reactor, the continuous flow integrated type anaerobic ammonia oxidation bio-membrane reactor is connected with the water outlet tank through a water outlet pipeline, and the water outlet pipe of the water outlet tank is connected with the water inlet tank through a reflux pump. The device has the advantages that part of ammonia distillation and cooling costs of a traditional coking wastewater treatment process is lowered, ammonia distillation cost is saved, the water inlet tank can homogenize water and regulate water temperature, and water treatment cost is lowered.

Description

Technical field [0001] The invention relates to the technical field of coking wastewater treatment, in particular to a treatment device and method for high ammonia nitrogen coking wastewater. Background technique [0002] Coking wastewater is industrial wastewater with complex composition, difficult to decompose, and a large amount of toxic and harmful substances produced in the process of gas purification, coke refining and chemical product recovery in coking plants. There are four main sources: one is surplus ammonia, which is waste water produced in the process of coal dry distillation and gas cooling. Its water volume accounts for more than half of the total coking wastewater and is the main source of coking wastewater; the second is in the gas purification process Waste water generated in the process, such as the final cold water of coal gas and crude benzene separation water; the third is the waste water generated in the refining process of tar and crude benzene; the fourth...

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Problems solved by technology

[0008] The disadvantages of the coking wastewater treatment method in the above prior art are: the cost of pretreatment processes such as dephenolization and ammonia distillation is high, the treatment effect of the existing ammonia distillation process is greatly affected by temperature, the energy consumption is too large, the operation is complicated, high temperature and high pressure Under the conditions, the equipment is seriously rotten, the operating cost is high (more than 6 yuan / t), and the temperature of the ammonia distilled water is very high, which increases the cooling step and further increases the cost of water treatment; in addition, the coking wastewater is highly toxic and has poor biodegradability, which makes the follow-up The quality of effluent from biochemical treatment processes is mostly difficult to meet the latest industry wastewater discharge standards

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