臭氧-上向流BAC工艺对常规及新污染物的控制效果

Control of Conventional and Emerging Contaminants by Ozone-Upflow Biological Activated Carbon Process

为了解“臭氧-上向流生物活性炭”深度处理工艺对新污染物及其他痕量污染物的去除效果,对深圳市某深度处理水厂进行了为期一年的调研与监测。结果表明,该深度处理工艺可以有效去除常规污染物,在一年的监测期内,其出水CODMn、TOC与氨氮的平均浓度分别为0.49、0.9、0.014 mg/L。荧光类有机物主要由深度处理工艺去除,去除率在50%以上;同时,可将生物可同化有机碳(AOC)的去除率从常规工艺的11.4%提升至41.4%,但在检测期内出厂水的AOC均不能满足生物稳定性要求。经深度处理后,出厂水中二甲基三硫醚(DMTS)、2-甲基异莰醇(2-MIB)和土臭素(GSM)均能满足深圳市饮用水标准要求。“臭氧-上向流生物活性炭”深度处理工艺对37种药品及个人护理品(PPCPs)和8种内分泌干扰物(EDCs)具有较好的去除效果,平均去除率分别为85.9%和80.4%,有效控制了新污染物对人体健康造成的风险,但出水炔雌醇风险熵值仍远高于高风险限值(冬季为27.7,夏季为169.6),需要重点关注。

In order to understand the removal effect of advanced treatment processes on emerging pollutants and other trace pollutants,a one‑year investigation and monitoring was conducted on the ozoneupflow biological activated carbon(O3-BAC)process of a advanced treatment water plant in Shenzhen City.The results indicated that the advanced treatment process could effectively remove conventional pollutants,with average concentrations of CODMn,TOC,and ammonia nitrogen in the effluent being 0.49 mg/L,0.9 mg/L,and 0.014 mg/L,respectively.Fluorescent organic compounds were mainly removed by the advanced treatment process,with a removal rate of over 50%.The advanced treatment process could improve the removal rate of assimilable organic carbon(AOC)from 11.4%in conventional processes to 41.4%,but the AOC in the effluent did not meet the biological stability requirements during the monitoring period.After advanced treatment,the effluent concentrations of DMTS,2‑MIB and GSM met Shenzhen’s drinking water standard.The O3-BAC process demonstrated good removal efficiency for 37 PPCPs and 8 EDCs,with average removal rates of 85.9%and 80.4%,respectively.The advanced treatment process could effectively control the risk of emerging contaminants on human health,but the risk entropy value of estrone in the effluent was still much higher than the high‑risk limit value(27.7 in winter and 169.6 in summer),which required special attention.