异龙湖水体化学需氧量赋存物质的形态学分析  

Analysis of Morphological Factors Contributing to Chemical Oxygen Demand in the Water Body of Yilong Lake

作　　者：李爱军 李飞 文诗蕴 普海燕 陈瑜 李文华 黄云 施择 李琴 LI Aijun;LI Fei;WEN Shiyun;PU Haiyan;CHEN Yu;LI Wenhua;HUANG Yun;SHI Ze;LI Qin(Yunnan Eco-environmental Monitoring Centre,Kunming 650034,China;The Ecological and Environmental Monitoring Station of DEEY in Honghe,Honghe 661100,China;Shiping Eco-environmental Monitoring Station,Honghe 662200,China)

机构地区：[1]云南省生态环境监测中心,云南昆明650034 [2]云南省生态环境厅驻红河州生态环境监测站,云南红河661100 [3]石屏县生态环境执法监测站,云南红河662200

出　　处：《中国环境监测》2024年第5期165-170,共6页Environmental Monitoring in China

摘　　要：化学需氧量(COD)是富营养化湖泊的常见超标指标,了解COD赋存物质组成可以为有效削减COD提供重要信息。选择COD长期处于较高水平的云南省异龙湖,根据异龙湖水体悬浮颗粒的形态特征构成,设计静置、不同孔径筛网过滤、离心、0.45μm玻璃纤维滤膜过滤等4类水样处理方法,比较不同方法对水体COD及不同颗粒的削减效果,探究异龙湖水体不同形态物质对COD的贡献。结果表明,拉氏拟柱胞藻和可溶态还原性物质是异龙湖COD的最主要赋存物质,高密度的拟柱胞藻及其代谢产物是异龙湖水体COD长期居高不下的直接原因。异龙湖水质脱劣的研究重点应更多向内源污染去除倾斜,尤其关注以拉氏拟柱胞藻为绝对优势的浮游藻类群落构成的形成原因分析方面,这有可能为从源头上削减异龙湖COD找到更为“治本”的措施。Chemical oxygen demand(COD)is a common indicator of eutrophication in lakes.Understanding the composition of COD occurrence matter is crucial for effective COD reduction.Previous studies have primarily focused on the contribution of inorganic ions and dissolved organic matter to COD,while research on the contribution of suspended particles in COD has been limited.In this study,we examined Yilong Lake in Yunnan Province,a lake with persistently high COD levels.We designed four water sample processing methods based on the composition and morphological characteristics of suspended particles in Yilong Lake,including settling,filtration through screens with different pore sizes,centrifugation,and filtration through 0.45μm glass fiber filter membrane.We compared the effectiveness of these methods in reducing COD and different particles,and explored the contribution of different morphological matter to COD in Yilong Lake.The results showed that Cylindrospermopsis raciborskii and soluble reducible matter were the main contributors to COD in Yilong Lake,and the high-density Cylindrospermopsis raciborskii and their metabolic products were the direct cause of consistently high COD levels in the lake.Therefore,efforts to improve water quality in Yilong Lake should focus on addressing endogenous pollution,particularly the factors leading to the formation of Yilong Lake’s unique community of planktonic algae dominated by Cylindrospermopsis raciborskii.This approach may help identify more fundamental measures for reducing COD in Yilong Lake from the source.

关 键 词：化学需氧量 赋存物质 拉氏拟柱胞藻 内源污染削减 

分 类 号：X323[环境科学与工程—环境工程] X524X824