广东某污水厂二期工程集约化设计

Intensive Design of the PhaseⅡProject of a Sewage Treatment Plant in Guangdong

广东某污水处理厂二期工程设计规模为10×10^(4)m^(3)/d,采用预处理—五段Bardenpho生物池—矩形周进周出二沉池—高效沉淀池—精密过滤器工艺,出水水质执行《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准以及广东省地方标准《水污染物排放限值》(DB 44/26—2001)第二时段一级标准中的较严值。污泥采用机械浓缩—化学调理—高压板框脱水工艺,将污泥含水率降至60%后外运处置。实际运行表明,出水水质完全达到设计标准。针对用地紧张的问题,合理选择处理工艺,优化单体设计,采用集约化、紧凑型布置,减少占地。在第二级缺氧池同时布置推流器和曝气盘,实现AAOAO和A2O两种生物处理模式的切换,灵活应对水质波动。设置精确曝气系统,按需调节和分配曝气量,实现节能降耗。

The design scale of the phaseⅡproject of a sewage treatment plant in Guangdong is 10×104 m3/d.The process consists of pretreatment,five-stage Bardenpho bioreactor,rectangular secondary sedimentation tank with peripheral inflow and outflow,high efficiency settling tank and precision filter.The effluent quality is required to meet first level A limit specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002)and the stricter value of first level limit in the second period specified in Discharge Limits of Water Pollutants(DB 44/26-2001).The water content of sludge is reduced to 60%after treated by the process of mechanical thickening,chemical conditioning,and high pressure plate and frame dehydration,and then it is transported outside for disposal.The actual operation shows that the effluent quality meets the design discharge standards completely.The design reduces the footprint area by reasonable selection of the treatment technology,optimization of the single structure design and intensive and compact layout of the structures.The submersible water impeller and aeration disk are equipped simultaneously in the second-stage anoxic tank to realize the switching between AAOAO and A2O biological treatment modes,and flexibly cope with water quality fluctuations.The energy saving and consumption reduction is achieved by setting a precise aeration system to adjust and distribute aeration rate according to the need.