Coked and petrochemical wastewater treatment process having deep biochemical treatment and physicochemical treatment

Abstract

The invention discloses a process method for treating coking wastewater and petrochemical wastewater with advanced biochemical and physic-chemical treatment. The method comprises a step of pretreatment, a step of conventional biological treatment, a step of advanced biochemical treatment and a step of materialized treatment, wherein, the step of pretreatment comprises adjustment, oil removal and floatation; the step of conventional biological treatment consists of an anaerobic-anoxybiotic-aerobic activated sludge process, an anoxybiotic-aerobic bio-film activated sludge process or an anoxybiotic-aerobic bio-film process which are performed in sequence; the step of advanced biochemical treatment adopts a filtering stage and a back purging stage which are performed alternately and repeatedly in a biological aerated filter, and the switching of the two stages are executed by an automatic control system; the step of materialized treatment adjusts pH of water treated in the biological aerated filter to be subacidity, adds Fe<2+> salt and H2O2 into the water and stirs to react in an advanced chemical oxidation pond, and then performs an operation mode of neutralization and precipitation. Therefore, final effluent organic substances can be reduced to a lower level, which can completely fulfill the first-grade national effluent standard, and can achieve recycle-water quality through increasing the dosage for the advanced chemical oxidation pond. The wastewater treatment process has simple operation and maintenance, and both BAF and ACO adopt automatic control.

Description

technical field [0001] The invention belongs to the coking wastewater and petrochemical wastewater treatment process, in particular to the coking and petrochemical wastewater treatment process with deep biochemical and physical chemical treatment. Background technique [0002] At present, coking wastewater and petrochemical wastewater are generally treated by a treatment process consisting of three parts: pretreatment (such as adjustment, oil removal, flotation, etc.), conventional biochemical treatment, and physical and chemical treatment (such as coagulation, sedimentation, etc.). Among them, the biochemical and physical chemical treatment part is the key to the treatment of coking wastewater and petrochemical wastewater. The effect of biochemical and physical chemical treatment is directly related to the quality of the treated effluent. At present, the biochemical treatment mainly adopts the A / O biological method, and the physical and chemical treatment mainly adopts the ...

AI Technical Summary

Problems solved by technology

At present, the biochemical treatment mainly adopts the A / O biological method, and the physical and chemical treatment mainly adopts the method of coagulation and sedimentation, but this physical and chemical treatment process method, from the current analysis of the effect of coking wastewater and petrochemical wastewater treatment, it is believed that it has the following Disadvantages: First, the quality of the treated effluent is not high, especially the content of organic matter (expressed in COD) in the treated water is not easy to meet the national first-level discharge standards, and it is even more difficult to meet the water quality requirements for reused water. Second, the impact load resistance is low. When the water quantity and water quality of wastewater raw water fluctuate, the effluent water quality is very unstable, and it is difficult to maintain the wastewater treatment process

Therefore, the coking wastewater and petrochemical wastewater treatment process with A / O biochemical, coagulation and sedimentation treatment can no longer meet the technical requirements of coking wastewater and petrochemical wastewater treatment

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