ZHANGMin,XUYing,MIAOYi,et al.Utilization of CT Value in Urban Sewage Chlorine Disinfection and the Impact of Phosphorus Removal Agents[J].China Water & Wastewater,2024,40(17):79-83.
城镇污水氯消毒CT值应用及除磷药剂的影响
- Title:
- Utilization of CT Value in Urban Sewage Chlorine Disinfection and the Impact of Phosphorus Removal Agents
- Keywords:
- sewage treatment plant; disinfection; sodium hypochlorite; CT value; phosphorus removal agent
- 摘要:
- 浓时积（CT值）是一种指导消毒工艺的实用准则，不同的CT值通常对应不同消毒方式处理后微生物的去除率，通过CT值可以确定各污水处理厂相应的氯消毒参数。以出水总余氯计算拟合的CT值与粪大肠菌群对数去除率，CT值曲线相关性系数可达0.8。通过拟合得到的CT值曲线发现，要满足《太湖地区城镇污水处理厂及重点工业行业主要水污染物排放限值》（DB 32/1072—2018）中出水粪大肠菌群数<1 000 个/L的要求，出水总余氯推荐控制在0.5 mg/L，有效氯投加浓度推荐控制在3~5 mg/L，而除磷药剂中若铁含量过高（>3%）则会抑制次氯酸钠的消毒效果，因此使用此类除磷药剂的污水处理厂需适当提高消毒药剂有效浓度。
- Abstract:
- The concentration time product (CT value) serves as a practical criterion for guiding the disinfection process. Different CT values are typically associated with varying levels of microorganism removal following different disinfection methods, and the corresponding chlorine disinfection parameters for each sewage treatment plant can be determined based on CT values. The fitted CT value and the logarithmic removal rate of fecal coliforms were determined based on the total residual chlorine in the effluent, yielding a correlation coefficient of 0.8 for the CT value curve. Based on the fitted CT value curve, it was recommended to control the total residual chlorine in the effluent at 0.5 mg/L, and the effective chlorine concentration should be maintained within a range of 3-5 mg/L, so as to comply with the effluent fecal coliforms requirement of less than 1 000 count/L as stipulated in Discharge Standard of Main Water Pollutants for Municipal Wastewater Treatment Plant ＆ Key Industries of Taihu Area (DB 32/1072-2018). However, if the iron content of phosphorus removal agents exceeded 3%, it would hinder the disinfection performance of sodium hypochlorite. Therefore, sewage treatment plants using such phosphorus removal agents should appropriately increase the effective concentration of disinfectants.
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