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传统的“老三套”污水处理工艺处理炼油废水,外排污水不能满足国家《污水综合排放标准》一级新扩改标准(COD≤60mg/L)。2014年,洛阳石化在炼油污水处理末端增上LHPS(高效沉淀池)+BAF(曝气生物滤池)组合装置,对炼油污水进行深度处理,设计处理规模为350m3/h,浊度、悬浮物、COD、氨氮、总磷的总去除率分别达到91.03%、97.24%、45.04%、38.27%、90.43%,处理后浓度分别为4.43mg/L、1.32mg/L、49.9mg/L、1.21mg/L、0.134mg/L,达到了污水排放标准要求。该工艺在设计和运行中应注意:对难降解污水末端处理,污水BOD和COD的比值较低,深度生化反应困难,投加粉末活性炭比臭氧氧化能更为简易和经济地去由悬浮物所贡献出的COD;要选择优良的BAF滤头和滤料,避免滤头折断和滤料破碎影响处理效果;BAF中氮营养物低,会影响系统内活性污泥微生物的生长,如增加一定量的氮源,BAF处理效果会更好;混凝剂三氯化铁加药系统不能使用不锈钢材质,以免腐蚀。
The traditional “old three ” sewage treatment process for the treatment of oil refinery wastewater, effluent can not meet the national “Integrated Wastewater Discharge Standards,” a new standard (COD ≤ 60mg / L). In 2014, Luoyang Petrochemical added LHPS (High Efficiency Sedimentation Tank) + BAF (Aeration Biofilter) combination unit at the end of the refining wastewater treatment plant to conduct deep treatment of the refinery wastewater. The design and treatment scale is 350m3 / h, turbidity and suspended solids , COD, ammonia nitrogen and total phosphorus reached 91.03%, 97.24%, 45.04%, 38.27% and 90.43%, respectively. The concentrations of COD, ammonia and total phosphorus were 4.43mg / L, 1.32mg / L, 49.9mg / L and 1.21mg /L0.134mg/L, reached the sewage discharge standard requirements. The process should be noted in the design and operation: difficult to degrade the end of the sewage treatment, the sewage BOD and COD ratio is low, the depth of biochemical reactions difficult to add powdered activated carbon than ozone oxidation can be more simple and economical to go by the suspended matter Contribute to the COD; to choose good BAF filter and filter media, to avoid the filter breakage and filter crushing affect the treatment effect; BAF low nitrogen nutrients, will affect the system of activated sludge microbial growth, such as increasing a certain amount Of the nitrogen source, BAF treatment effect will be better; coagulant ferric chloride dosing system can not use stainless steel, to avoid corrosion.