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Petrochemical wastewater treatment

2016-06-23 14:36:15 天工欧凯 Read

石油化工废水处理方案.jpg

     

Petrochemical waste water discharged into the aquatic environment of oil, can prevent oxygen from the air into the water, plankton in the water and died from lack of oxygen and cause fish and shellfish and other sour, unfit for human consumption, and in surface water coalescing oil combustion may also create security problems. At present, most of the oil has entered the post-production phase, the produced fluid water content annually, over 90% in many fields. The petrochemical industry uses chemical and physical separation method of combining processed into the desired products with crude petroleum and natural gas as raw materials, industrial raw materials and other products. The major pollutants were oil, sulfur, cyanide, phenols, suspended solids, and various organic compounds and some heavy metals. If not treated discharged into the receiving water body, can cause serious pollution.

By grill large pieces of suspended solids removal, grease and preliminary oil and suspended solids in the water is partially removed. Then water was added demulsifier, creamy structure which enables liquid damage to the emulsion in order to separate the phases purposes. It refers to the use of crude oil demulsification demulsifier chemical action of the water emulsified mixture of oil and water to leave, so as to achieve the purpose of dehydration of crude oil, in order to ensure Crude Oil Transportation aqueous standards. And then into the conditioning tank, where regulation of water, water quality and PH. Effluent into the coagulating sedimentation tank by adding coagulant, coagulation produce floc precipitation to reduce the effluent chroma, CODcr, SS and other indicators. Coagulating sedimentation tank effluent into the hydrolysis acidification pool, by hydrolyzing bacteria and facultative anaerobic bacteria coordinating role of acid production, partially decomposed organic matter, and the insoluble organic matter into soluble organics, the biodegradable macromolecules into readily biodegradable small molecules to improve the wastewater biodegradability. Anoxic mainly biological contact oxidation pond was subjected to nitrification denitrification to remove ammonia, sludge in the anoxic tank for biological denitrification reaction, the conversion of nitrate to nitrogen gas to escape. Anoxic tank effluent into the biological contact oxidation pond, pool set up special biochemical efficient means to accumulate a large number of active micro-organisms, so that most of organic matter in sewage is degraded to CO2 and H2O, a small part into the activated sludge. Ammonia, organic nitrogen oxygen in the process of being converted to nitrite and nitrate nitrogen, is returned to the process section of hypoxia denitrification process degradation, removal, so as to achieve the purpose of denitrification. Sludge and biological contact oxidation pond water generated by the original insoluble small particles of suspended solids with water from flowing into the subsequent secondary settling tank, using its own gravity precipitation concentrated supernatant overflow into the automatic filter, secondary sedimentation tank sludge pump back to the biochemical pool and pool acid hydrolysis, on the one hand continue to provide its species, to maintain a high pool of biomass, the waste water is further purified into clean water tank after the water discharge standards.



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