Coking wastewater treatment method and coking wastewater treatment device

Abstract

The invention discloses a coking wastewater treatment method and a coking wastewater treatment device, and relates to the technical field of coking wastewater treatment. The coking wastewater treatment method comprises the following steps: (1) standing wastewater to be treated, and filtering the wastewater to be treated to remove large-particle impurity deposits; (2) adding phosphoric acid to thewastewater, and filtering obtained precipitate; (3) carrying out high pressure atomization on the wastewater, spraying the atomized wastewater into a high-temperature smoke section, carrying out flashevaporation, generating salt crystals through a desulfurization tower, and cooling the wastewater; (4) carrying out multistage countercurrent extraction on the cooled wastewater with an extractant toobtain non-volatile phenols and monohydric phenols; (5) carrying out oxidation treatment on the wastewater through an aeration bio-filter; (6) filtering the wastewater by active carbon with the particle size being 90-130 [mu]m; (7) treating the wastewater by a membrane bioreactor; and (8) carrying out reverse osmosis filtration treatment on the wastewater through a reverse osmosis filtration device. The method and the device have the advantages of significant improvement the treatment efficiency of the coking wastewater, meeting the requirements of circulating water, stability in system running, and low cost.

Description

Technical field [0001] The invention relates to the technical field of coking wastewater treatment, in particular to a coking wastewater treatment method and device. Background technique [0002] Coking wastewater mainly comes from the processes of coking, gas purification and chemical product refining. It is a complex wastewater containing dozens of pollutants such as phenol, cyanide, benzene, ammonia nitrogen, etc. It is a typical high-concentration, toxic, harmful, and difficult-to-degrade organic wastewater. . At present, domestic coking companies generally adopt the coking wastewater process with traditional biological denitrification treatment as the core, which is divided into pretreatment, biochemical treatment and advanced treatment; pretreatment mainly adopts physical and chemical methods; biochemical treatment mainly includes A / O, A2 / O and other processes; advanced treatment is activated carbon adsorption method. However, the existing process has the problems of ser...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a coking wastewater treatment method and device in order to solve the problems of serious fouling and corrosion in the coking wastewater treatment process, immature process, unstable device operation, high operating cost and unsatisfactory treatment effect.

Images