北方某城市污水处理厂节能降耗改造及运行

Reconstruction for Energy Saving and Consumption Reducing and Actual Operation of a WWTP in North China

北方某城市污水厂设计规模为10×10~4m^3/d,采用典型A^2/O二级处理+曝气砂过滤+ClO_2消毒工艺。针对冬季出水TN难达标和运行能耗高的问题进行了综合改造。分析了污水厂各处理单元能耗特点,提出了节能降耗具体措施。改造后运行结果表明,预处理单元降低电耗近17.3%,生化处理单元降低电耗近24.1%,深度处理单元降低电耗近4.6%,污泥处理及加药单元降低电耗近7.3%,且出水水质稳定,各项指标均可达到《城镇污水处理厂污染物排放标准》(GB18918—2002)一级A标准。最后对该工艺进一步提升节能降耗效果的潜力进行了分析。

The design capacity of a WWTP in north China was 10 x 10^4 m3/d, and the A2/O/aeration sand filtration/Cl02 disinfection process was adopted. To address the problems of high concentration of TN in the effluent and high operation energy consumption in winter, a comprehensive reconstruction was carried out. The characteristics of energy consumption in each treatment unit were analyzed, and theenergy saving measures were put forward. After the reconstruction, the operation results indicated that 17.3% of power consumption was saved in pre-treatment unit; 24.1% of power consumption was saved in biochemical treatment unit; 4.6% of power consumption was saved in advanced treatment unit; and 7.3% of power consumption was saved in sludge treatment and dosing unit. The effluent quality could meet the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （GB 18918 -2002）. The potential for further improving the energy saving and consumption reducing effect was analyzed.