宜昌市集中连片池塘养殖尾水污染调查

Monitoring and Analysis of Tail Water Discharge in Winterin Centralized Continuous Pond Culture Area of Yichang

于2022年11月—2023年3月,对宜昌东部集中连片池塘养殖区冬季养殖尾水污染进行调查,采集水样本265个。采用单因子污染指数法,对总氮(TN)、总磷(TP)和高锰酸盐指数(IMn)进行评价。结果表明,采样点位TN、TP、IMn月均值符合《淡水池塘养殖水排放要求》(SCT 9101—2007)二级标准值,监测期间,池塘水体TN、TP和IMn总体合格率分别为85.81%,97.42%和99.35%,沟渠等TN、TP、IMn总体合格率分别为94.55%,100%和100%。单因子污染指数分析结果表明,宜昌东部集中连片池塘养殖区未受到TN、TP和IMn污染,TN为潜在污染物。

From November 2022 to March 2023,we investigated the water quality of aquaculture tail water in the eastern pond culture area of Yichang in winter,265 water samples were collected.The single-factor pollution index method was employed for individual evaluation of total nitrogen(TN),total phosphorus(TP)and chemical oxygen consumption(IMn).The results showed that the contents of TN,TP and IMn were in line with the Level II standard of stipulated in the Freshwater Pond Aquaculture Water Discharge Requirements.During the monitoring period,the eligible rate of TN,TP and IMn in the pond was 85.81%,97.42%and 99.35%respectively,and the eligible rate of TN,TP and IMn in ditches was 94.55%,100%and 100%respectively.The results of single-factor pollution index analysis showed that the tail water was not polluted by TN,TP and IMn.TN is a potential water pollutant.