摘要
目前,城市污水处理厂设计方式还是依据设计手册选取参数,难以准确预测不同进水负荷和污染物组分条件对出水产生的影响。利用污水处理模型软件对污水处理厂设计文件进行模拟可以快速地验算不同条件对处理效果的影响。利用BioWin模型对重庆市某镇级污水处理厂设计方案进行模拟,结果表明:在设计进水水质及运行条件下,该厂各出水水质均能达到一级B标准,满足设计要求;通过进水特征变化模拟,按照设计文件的变化系数增大进水水量后或降低进水COD浓度时,均会导致出水超标;通过运行特征变化模拟,降低内回流比,在原有设计基础上可减少1台曝气机,既能节能降耗又能保证出水水质达标;对原有设计方案进行优化,在原方案基础上优化方案为减少1台曝气机曝气量,调整内回流比为50%,调整污泥回流比为75%。优化方案模拟结果表明,不论是在平均运行温度还是在不利运行温度下,该优化方案均能使出水各项指标达到一级A标准。
The design method of municipal wastewater treatment plant is based on the design manual at present, but it is difficult to predict the impact of different influent load and pollutant composition condition on the effluent. Using sewage treatment model software to simulate sewage treatment plant design documents can quickly check the impact of different conditions on the treatment effect. This study provided process simulation and design optimization for a sewage treatment plant in Chongqing based on the BioWin software. The result showed that in the design of influent water quality and operating conditions, the water quality of the plant could reach Class I-B standard to meet the design requirements. Through the simulation of water inlet characteristics change, according to the variation coefficient of design documents, increasing the influent water or reducing the influent COD concentration would lead to effluent exceeding the standard. By simulating the operation characteristics and reducing the internal reflux ratio, one set of aerator could be reduced on the basis of the original design, which not only saved energy but also ensured the effluent quality. Based on the original plan, the optimized plan reduced the aeration rate of one set of aerator and adjusted the ratio of internal reflux to 50%. The sludge reflux ratio was adjusted to 75%. The simulation results showed that the optimized plan could reach Class I-A standard whether at average operation temperature or unfavorable operating temperature.
作者
陈建
周谐
李萍
黄伟
龚玲
CHEN Jian;ZHOU Xie;LI Ping;HUANG Wei;GONG Ling(Ecological and Environmental Monitoring Center of Chongqing, Chongqing 401147, China)
出处
《环境影响评价》
2017年第6期79-86,共8页
Environmental Impact Assessment
基金
科技部港澳台科技合作专项项目(2014DFH90030)
重庆市社会民生科技创新专项(cstc2015shmszx20013)
