Method for treating waste water in aerobic and two-stage anoxic-aerobic ways

Abstract

The invention discloses a method for treating waste water in aerobic and two-stage anoxic-aerobic ways. The waste water flows through a regulating tank, a primary aeration tank, a primary settling tank, an anoxic tank, a first-stage aerobic tank, a secondary settling tank, an aerobic tank, a second-stage aerobic tank, a triple settling tank, a coagulation reaction tank, a coagulation settling tank and a decolorizing tank in sequence, so that water is finally discharged within controlling indexes of the national standard. The anoxic tank, the first-stage aerobic tank and the secondary settling tank construct a first-stage anoxic-aerobic system; and the aerobic tank, the second-stage aerobic tank and the triple settling tank construct a second-stage anoxic-aerobic system. After treatment, the removing efficiencies of major organic pollutants, particularly ammonia nitrogen and total nitrogen in the coal chemical industry are increased greatly; due to the arrangement of a two-stage anoxic-aerobic system, the reflux amount of a nitration liquid is reduced, system energy consumption is lowered, and the removing efficiency of total nitrogen is increased greatly simultaneously; and due to the arrangement of a coagulation, decolorizing and reaction unit, the COD (Chemical Oxygen Demand) of discharged water is further lowered, and decolorizing, sterilizing and deodorizing functions are realized.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, in particular to a method for treating waste water by using aerobic and two-stage anoxic and aerobic. Background technique [0002] Coal chemical industry is an industry that produces chemical products with coal as the main raw material. It is mainly divided into coal coking, coal gasification (including the production of synthetic ammonia, production of alcohol ethers and indirect liquefaction of oil and olefins and other industrial chains) and coal liquefaction. At present, my country is in a period of great development of new coal chemical industry. Compared with the obvious development obstacles of traditional coal chemical industry, new coal chemical industry represented by coal gas (oil) has high energy conversion rate, low water consumption, and carbon dioxide The obvious advantages of low emissions and large market potential have become the new favorite of petrochemical in...

AI Technical Summary

Problems solved by technology

At present, the vast majority of coal chemical enterprises have realized the biotechnology treatment of wastewater and can only meet the first-level discharge standard of the national "Comprehensive Wastewater Discharge Standard" (GB8978-1996), which is difficult to meet the requirements of the draft for comments. New water treatment processes have been developed to achieve The discharge of total nitrogen is imminent

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