摘要
以某湖区水体为研究对象,参照《地表水环境质量标准》(GB3838-2002)及《地表水环境质量评价办法(试行)》,对2011-2020年该湖区高锰酸盐指数(CODMn)、化学需氧量(COD)、总氮(TN)、总磷(TP)、氨氮(NH4+-N)、叶绿素a(Chl-a)、透明度(SD)等水质指标进行调查与分析。结果表明:该湖区近十年水质除2017-2019年TP超标为Ⅳ类水外,其他时间基本稳定在Ⅲ类水质水平;TN近十年一直超过Ⅲ类,2016年达到最高值3.4 mg/L,之后下降至1.3 mg/L左右,但2018年之后又有略微上升的趋势;结合NH4+-N浓度不断下降的趋势,发现近十年该湖区有机氮和无机氮的输入不断增加。通过对湖区水质进行加密分析,发现TN、TP在东湖东岸边以及南岸附近浓度较高,Chl-a在东湖北部和西湖西北部圩区附近含量较高。通过富营养化状态指数分析可知,自2014年以来,该湖区富营养化程度呈明显上升趋势,且西湖有高于东湖的趋势。
Taking a lake body as the research object,permanganate index,chemical oxygen demand(COD),total nitrogen(TN),total phosphorus(TP),ammonia nitrogen(NH+4-N),chlorophyll a(Chl-a),lake clarity(secchi disk depth,SD)and other water quality indexes during 2011-2020 were investigated and analyzed,with reference to the surface water environmental quality standard(GB3838-2002)and the Surface Water Environmental Quality Evaluation Measures(Trial).The results showed that TP of the lake area in the past ten years was basically stable at the level of ClassⅢ,except for 2017-2019,when it exceeded the standard of ClassⅣ.TN had been exceeding ClassⅢin 2011-2020,reaching a peak of 3.4 mg/L in 2016,and then decreasing to about 1.3 mg/L,but it increased slightly after 2018.Combined with the decreasing trend of concentration of NH+4-N during this period,it was found that the input of organic nitrogen and inorganic nitrogen in the lake increased.Through intensive monitoring analysis of the water quality of the lake,the concentrations of TN and TP were higher near the east and south shores of the East Lake,and the concentrations of Chl-a were higher near the north of East Lake and the polder area in the northwest of West Lake.By comparing the eutrophication index,since 2014,the rich nutrition level of the lake showed a significant upward trend,and the index of West Lake was a higher than that of East Lake.
作者
林保国
许大强
胡广志
陈铁龙
褚巍
Lin Baoguo;Xu Daqiang;Hu Guangzhi;Chen Tielong;Chu Wei(Anhui Kexin Environmental Protection Co.,Ltd.,Hefei 230601,Anhui,China;School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,Anhui,China)
出处
《绿色科技》
2024年第18期76-82,87,共8页
Journal of Green Science and Technology
关键词
湖区
水质指标
加密分析
富营养化
lake bodies
water quality indexes
intensive monitoring analysis
eutrophication
