Coking wastewater purifying agent as well as preparation method and application thereof

Abstract

The invention discloses a coking wastewater purifying agent as well as a preparation method and an application thereof and belongs to the technical field of environmental protection. The purifying agent consists of a coagulant, a coagulant aid and an accelerant, wherein the coagulant consists of an iron salt, an aluminum salt, a magnesium salt and a zinc salt; the coagulant aid consists of PAM (polyacrylamide) and bentonite; and the accelerant consists of zeolite powder and chitosan. The purifying agent is powdery, is convenient to use, and is simple in preparation process and low in cost. The purifying agent is applied to treatment of coking wastewater to effectively reduce COD (chemical oxygen demand) and the concentrations of ammonia nitrogen, chroma, volatile phenol and cyanide in the coking wastewater, and the quality of produced water is stable.

Description

technical field

[0001] The invention belongs to the technical field of environmental protection and relates to the preparation and application of a waste water purifying agent, in particular to a coking waste water purifying agent and its preparation method and application. Background technique

[0002] Coking wastewater is wastewater of a large amount of aromatic compounds and heterocyclic compounds produced in the process of coal coke, gas purification and coking product recovery, which belongs to high-concentration refractory organic wastewater. At present, domestic coking wastewater adopts biological method as the main treatment process, but due to its high concentration of organic matter, difficult biodegradation, high biological toxicity, many types of substances, high concentration of ammonia nitrogen, etc., it is difficult to discharge wastewater treated solely by biological methods. standard requirements.

[0003] The coagulation and sedimentation method is an econ...

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