System and method for treating comprehensive wastewater of hazardous waste disposal center

Abstract

The invention relates to a method for treating comprehensive wastewater of hazardous waste disposal center. A regulating tank, a reducing tank, a neutralization tank, a sedimentation tank, a hydrolysis acidification tank, a contact oxidation tank, a coagulation sedimentation tank, an activated carbon filter and a clear water tank are sequentially connected by means of pipelines, and each connecting pipeline is provided with a valve. The reducing tank, the neutralization tank, the coagulation sedimentation tank and the clear water tank are separately provided with a chemical feeding box; the bottom of the sedimentation tank is communicated with a sludge discharge pipeline, and the separated sludge is discharged outside through the sludge discharge pipeline; the coagulation sedimentation tank is internally and separately provided with a mixing paddle type mixer, a flocculation frame type mixer and a sloping plate type sedimentation plate for mixing, flocculating and precipitating the wastewater in the coagulation sedimentation tank; the sediment is shoveled by means of a mud scraper or a mud bucket, and is discharged out from the coagulation sedimentation tank at the fixed period bymeans of a mud discharge pump; a contact oxidation tank is internally provided with an aeration system. All the indexes of the treated comprehensive wastewater can meet the standard limit requirementsof Urban Wastewater Reuse and Urban Miscellaneous Water Quality.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment system and method for comprehensive wastewater in a hazardous waste treatment center. Background technique [0002] Wastewater from the hazardous waste disposal center mainly comes from the flushing water of transport vehicles and containers, temporary storage drainage, laboratory drainage, flushing site water, physical and chemical treatment workshop drainage, landfill leachate, initial rainwater and domestic wastewater. The main pollutants include Chemical oxygen demand, five-day biochemical oxygen demand, suspended solids, ammonia nitrogen, phosphate, petroleum, animal and vegetable oils, anionic surfactants, formaldehyde, volatile phenols, benzene, toluene, organophosphorus pesticides (calculated as P), organic Chlorine pesticides, PCBs, total lead, total chromium, total mercury, total nickel, total arsenic, cyanide, residual chlorine, etc. Affected ...

AI Technical Summary

Problems solved by technology

Since the wastewater in the hazardous waste disposal center contains toxic and harmful substances such as benzene and toluene, the water quality and volume fluctuate greatly, and the biodegradability is poor. It is difficult to achieve stable and up-to-standard discharge or reuse by simply relying on conventional activated sludge and other biological wastewater treatment processes; Although physical and chemical methods such as oxidation reduction and flocculation are used to treat wastewater from hazardous waste disposal centers, the effect is acceptable, but there are many types of chemicals, large dosage, and high operating costs.

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