Treatment method and treatment device for zero discharge and reuse of coking wastewater

Abstract

The invention belongs to the field of wastewater treatment, and particularly discloses a coking wastewater zero-discharge recycling treatment method which comprises the following steps: pretreating wastewater; introducing the pretreated wastewater into an iron-carbon micro-electrolysis tank for treatment, introducing the treated water into a flocculation tank, and carrying out flocculation treatment to obtain supernate and flocculate; the flocculate is introduced into radial flow precipitation equipment to be treated, and precipitates and wastewater are obtained; introducing the supernate in the step S3 and the wastewater treated by the radial flow precipitation equipment in the step S4 into an oxidation reaction tank for oxidation reaction; introducing the residual solution into an ion exchange tank for separation, mixing the obtained anion solution and cation solution, and evaporating to obtain salt and a residual solution; and filtering the residual solution to obtain reuse water. Solid particles in the coking wastewater can be filtered out through pretreatment, and in addition, colloids in the wastewater can be converted into a flocculation state through flocculation treatment, so that the problem of pipeline or membrane blockage caused by the coking wastewater can be avoided.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, in particular to a treatment method and a treatment device for zero discharge and reuse of coking wastewater. Background technique [0002] Coking wastewater mainly comes from coke oven gas primary cooling and coking production process wastewater and steam condensation wastewater. Because of its wide source, complex composition, changeable characteristics and huge harm, it has become one of the most difficult industrial wastewaters to treat. It is difficult to meet the emission standards, and the recycling rate is generally low. Coking wastewater contains pollutants including phenols, polycyclic aromatic compounds and heterocyclic compounds containing nitrogen, oxygen and sulfur, etc. It is a typical refractory organic industrial wastewater with complex water quality and high salt content. It has been recognized as one of the most difficult wastewaters in the industry. At present, ...

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Problems solved by technology

[0005] At present, during the operation of the conventional coking wastewater advanced treatment process, due to factors such as imperfect pretreatment, process connection design or unreasonable operation, phenomena such as colloidal fouling and inorganic salt scaling often occur, making it difficult to ensure long-term stable operation of the process system

[0006] For the shortcomings of existing technologies, there is currently no solution

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