电厂循环冷却排污水达标外排处理试验研究  

Experimental study on standard discharge treatment of recirculating cooling sewage of a power plant

作　　者：肖艳 XIAO Yan(Hangzhou Research Institute of China Coal Technology&Engineering Group,Hangzhou 311201,China)

机构地区：[1]中煤科工集团杭州研究院有限公司,浙江杭州311201

出　　处：《能源环境保护》2021年第4期34-38,共5页Energy Environmental Protection

摘　　要：针对电厂循环冷却排污水有机物含量低、氮磷含量高的水质特点,采用同步生物氧化(SBOT)、澄清、砂滤、臭氧氧化及活性炭过滤相结合的处理工艺进行生产性试验。结果表明:SBOT水力停留时间4.5 h、好氧区溶解氧3.0 mg/L、C/N为2左右,澄清池上升流速1.93 m^(3)/(m^(2)·h)、聚合硫酸铝铁投加量35 mg/L、聚丙烯酰胺投加量为0.2 mg/L,滤池滤速8.2 m/h,臭氧投加量55 mg/L、接触时间30 min,活性炭滤池滤速6.8 m/h,出水COD_(Cr)最大为12.9 mg/L、最小为7.6 mg/L、平均为10.8 mg/L,NH^(+)_(4)-N最大为0.86 mg/L、最小为0.12 mg/L、平均为0.47 mg/L,TN最大为8.8 mg/L、最小为6.2 mg/L、平均为7.7 mg/L,TP最大为0.21 mg/L、最小为0.08 mg/L、平均为0.15 mg/L,SS最大为2.4 mg/L、最小为0.5 mg/L、平均为1.7 mg/L,相应的平均去除率分别为64.4%、97.2%、75.7%、54.7%及91.9%,满足《城镇污水处理厂主要水污染物排放标准》(DB33/2169—2018)要求。Based on the water quality characteristics of circulating cooling sewage of power plants,which are low organic matter and high nitrogen and phosphorus concentrations,a combined process of SBOT,clarification,sand filtration,ozone oxidation and activated carbon adsorption was applied for full-scale experiments.Under the conditions that hydraulic residence time(HRT)of SBOT=4.5 h,dissolved oxygen(DO)in aerobic zone=3.0 mg/L and C/N is about 2,the results of experiments show that the upward-flow velocity is 1.93 m^(3)/(m^(2)·h),the dosage of polymeric aluminum ferric sulphate(PAFS)is 35 mg/L,the dosage of PAM is 0.2 mg/L,the filtration rate is 8.2 m/h,the dosage of ozone is 55 mg/L,the contact time is 30 min,and the filtration rate of activated carbon filter is6.8 m/h.The maximum,minimum and average concentrations of COD_(Cr)are 12.9 mg/L,7.6 mg/L and10.8 mg/L,respectively.Those of NH^(+)_(4)-N are 0.86 mg/L,0.12 mg/L and 0.47 mg/L,respectively.Those of TN are 8.8 mg/L,6.2 mg/L and 7.7 mg/L,respectively.Those of TP are 0.21 mg/L,0.08 mg/L and 0.15 mg/L,respectively.Those of SS are 2.4 mg/L,0.5 mg/L and 1.7 mg/L,respectively.The average removal rates of COD_(Cr),NH^(+)_(4)-N,TN,TP and SS are 64.4%,97.2%,75.7%,54.7%and 91.9%,respectively.The effluent concentrations of those pollutants satisfy the requirements of Discharge standard of major water pollutants for municipal wastewater treatment plant(DB 33/2169—2018).

关 键 词：电厂循环冷却排污水 达标处理 SBOT 澄清过滤 臭氧氧化-活性炭吸附 

分 类 号：X703[环境科学与工程—环境工程]