占地受限下北方某高标准新建污水厂工程设计

Engineering Design of a New High-standard Wastewater Treatment Plant with Limited Footprint Area in North China

东北地区某新建污水厂设计规模3.0×10^(4)m^(3)/d,设计出水要求TN低于12 mg/L,SS低于10 mg/L,其余指标满足《地表水环境质量标准》(GB 3838—2002)中Ⅳ类水标准。该污水厂面临占地受限、排放标准高、低温等难题。污水处理采用"改良Bardenpho-MBBR+矩形周进周出二沉池+磁加载沉淀"组合工艺,实现了各工艺段的紧凑布置。实际运行效果显示,出水各指标稳定达标,Bardenpho-MBBR工艺提高了系统的耐低温性能,并实现了高效脱氮除磷效果。磁加载沉淀工艺提高了深度处理系统应对SS冲击的能力,实现了高效、稳定的SS和TP去除。污水厂占地面积0.641 m^(2)/(m^(3)·d^(-1)),直接运行费用0.512元/m^(3)。该组合工艺具有流程简洁、占地省、出水效果好等优势,特别适用于占地受限条件下的高标准污水厂的建设和运行。

Design treatment capacity of a new wastewater treatment plant(WWTP)in north China is 3.0×10^(4)m^(3)/d.TN and SS in the effluent are required to be lower than 12 mg/L and 10 mg/L,respectively,and other indicators need to meet classⅣlimitations of Environmental Quality Standards for Surface Water(GB 3838-2002).The construction of the WWTP is faced with problems such as limited footprint area,high discharge standard and low temperature.A combined process of modified Bardenpho-MBBR,secondary sedimentation tank with rectangular peripheral inflow and peripheral outflow and magnetic coagulation precipitation was selected to realize compact layout of each process section.The actual operational results showed that all the indices of the effluent could stably meet the discharge standards.The Bardenpho-MBBR process improved the low temperature resistance of the system and achieved efficient nitrogen and phosphorus removal.Magnetic coagulation precipitation improved the ability of the advanced treatment system to resist SS impact and realized efficient and stable SS and TP removal.The WWTP covered an area of 0.641 m^(2)/(m^(3)·d^(-1)),and the direct operational cost was 0.512 yuan/m3.The combined process has the advantages of simple process,less footprint area and good effluent water quality,which is suitable for construction and operation of high-standard WWTPs,especially those with limited footprint area.