清远市南部淡水养殖鱼塘水质抽样调查与污染评价

Water quality sampling survey and pollution assessment of freshwater aquaculture ponds in southern Qingyuan City

选取清远市南部水产养殖区5镇抽样调查的12个典型水产养殖淡水鱼塘的水质进行抽样检测,同时采用环境污染指数评价法对检测结果进行评价。结果表明溶解氧较丰富,pH值和水温基本符合鱼类生长要求,但是主要污染指标COD_(Cr)、NH_(4)^(+)-N和TP超标率分别为90%、33.3%、95%以上,其中TP污染负荷分担率最高,在25.9%~65.71%之间,鱼塘尾水直接排放,氮、磷有污染周边水体风险。

Twelve typical freshwater fish ponds in aquaculture areas of five towns in southern Qingyuan City were selected for water quality sampling and testing,and the results were evaluated using the Environmental Pollution Index method.The results showed that dissolved oxygen was abundant,and pH and water temperature generally met the+requirements for fish growth.However,the overstandard rates of COD_(Cr),NH_(4)^(+)-N and TP were 90%,33.3%and 95%,respectively,among which the TP pollution load sharing rate was the highest,ranging from 25.9%to 65.71%.The effluent from the fish ponds was directly discharged,posing a risk of nitrogen and phosphorus pollution to surrounding water bodies.