山东省某污水处理厂准Ⅳ类提标扩建设计

Design of Quasi-Class IV Upgrading and Expansion of a Wastewater Treatment Plant in Shandong

摘要:

山东省某污水处理厂设计处理规模4 万m³/d，为满足当地日益增长的污水处理需求，将污水处理厂扩建2万m³/d，同时全厂出水水质由《城镇污水处理厂污染物排放标准》（GB 18918—2002）一级A标准提高至《地表水环境质量标准》GB 3838—2002中的Ⅳ类标准（总氮不大于10 mg/L）。扩建部分采用“预处理+AAO+沉淀池+粉末活性炭吸附池+磁混凝沉淀池+转盘滤池+消毒”处理工艺路线；提标部分采用改造生化系统+粉末活性炭的工艺路线；污泥采用高压带式连续脱水机，含水率降低至65%以下，出水CODcr、氨氮、TN、TP出水平均值分别为17.8、0.42、8.8、0.24 mg/L，出水水质稳定优于设计标准。

Abstract:

The design treatment scale of a wastewater treatment plant (WWTP) in Shandong is 40 000 m3/d. To meet the increasing local demand for wastewater treatment, the WWTP will be expanded by 20 000 m3/d, while the effluent quality of the whole WWTP is upgraded from the Class 1A standard specified in the Discharge Standard for Pollutants from Municipal Wastewater Treatment Plants (GB 18918—2002) to the Class IV standard (total nitrogen not larger than 10 mg/L) outlined in the Environmental Quality Standards for Surface Water (GB 3838—2002). The treatment process of "pretreatment + AAO + sedimentation tank + powdered activated carbon adsorption tank + magnetic coagulation sedimentation tank + disc filter + disinfection" is adopted in the expansion section. The process of reconstructed biological system + powdered activated carbon is used in the upgrading section. For sludge treatment, the high-pressure belt continuous dewatering machines are used to reduce the moisture content to below 65%. The average effluent concentrations of CODcr, ammonia nitrogen, TN and TP are 17.8 mg/L, 0.42 mg/L, 8.8 mg/L, and 0.24 mg/L, respectively. The effluent quality is stable and is better than the design standards.