化工废水生化处理节能示范工程实例

An Energy-saving Project Instance of Wastewater Bio-treatment in Chemical Manufacturing

化工污水污染负荷较高、成分复杂且难降解成分较多,污水处理运行成本非常高,节能需求相对较迫切。本文从从曝气风机、曝气器、曝气水深、污泥截留方式、生化污泥处置等角度对生化污水处理能耗的影响进行了探讨,并进行了4 000m3/d的示范工程研究。示范工程研究表明,好氧生化采用磁悬浮风机、板式曝气器、曝气水深6m、二沉池及气浮截留生化污泥、强化缺氧共代谢,在出水达标排放基础上,示范工程生化处理段实现比功率3.2kgCODequ/Kw及零剩余生化污泥,具有较好的环境经济效益。

Due to higher pollution load, complexity and refractory of components of chemical wastewater, the costs of sewage treatment are very high, so its energy-saving demand is more urgent. Effects of aeration fans, aeration, aera- tion depth, sludge retention methods, and sludge disposal on energy consumption of wastewater bio-treatment were discussed, and a 4 000m3/d energy-saving demonstration projects was built. Results showed on the basis of effluent meeting emission standard, using magnetic levitation fan, plate aeration, aeration depth of 6m, sludge retention of secondary sedimentation and flotation, co-metabolism by strengthening the hypoxia, the demonstration project a- chieved energy demand 3.2kgcodequ/kw and zero residual biological sludge, which came with better environmental and economic benefits.