近海排水口水质BOD_(5)、DO和COD的线性关系分析  

Analysis on the linear relations about BOD_(5),DO and COD in the water of marine outfalls

作　　者：金兴良 孙滔滔 唐天均 廖国威 王煜 戴知广 JIN Xingliang;SUN Taotao;TANG Tianjun;LIAO Guowei;WANG Yu;DAI Zhiguang(Shenzhen Academy of Environmental Science,Shenzhen 518001,China;Shenzhen Ecological Environment Monitoring Station,Shenzhen 518001,China;State Environmental Protection Key Laboratory of Drinking Water Source Management and Technology,Shenzhen 518001,China)

机构地区：[1]深圳市环境科学研究院,广东深圳518001 [2]深圳市生态环境监测站,广东深圳518001 [3]国家环境保护饮用水水源地管理技术重点实验室,广东深圳518001

出　　处：《海洋湖沼通报（中英文）》2024年第3期90-96,共7页Transactions of Oceanology and Limnology

摘　　要：以BOD_(5)、DO与COD三个参数为研究对象,2020年某滨海城市近海排水口处水质监测数据表明,COD与BOD_(5)之间存在较好的一元线性关系;而DO分别与BOD_(5)、COD的一元线性关系均较弱。COD与BOD_(5)和DO三者之间的二元线性函数关系式被建立,其线性确定系数和F检验值均较高,表明三参数之间的线性拟合较好,相关性显著。数据分析较好地阐释了在理论定义上DO与其他两参数无直接关系,但三者因换算表达关系而存在一定关联。当COD大于100 mg/L时,二元线性函数对COD的拟合性优于COD与BOD_(5)构成的一元线性函数。该城市近海排水口2015年的监测数据被用于检验该二元线性函数关系式的可靠性,根据BOD_(5)、DO数据得到的COD模拟值与实测值的相对误差小于25%,符合质量控制要求,进一步证实该函数关系式可靠。The relations about BOD_(5),DO and COD were researched,which were acquired from water of marine outfalls near a coastal city,south China.The results indicated that preferable one-variable linearity existed between COD and BOD_(5),but relatively weak linearity between BOD_(5) and DO,as weakly between DO and COD.A binary linear function was established to express the relation about the three parameters,with a better linear determination coefficient and a larger F-test value.When COD≥100mg/L,the fitting degree of the binary linear function was better than the one-variable linear function between COD and BOD_(5).Monitoring data of BOD_(5),DO and COD from water of marine outfalls of this city in 2015 year was used to verify the binary linear function.The relative error between COD values fitted by the binary linear function and COD values detected in a lab,was less than 25%,which accorded with the precession of quality control criterion,and verified the binary linear function reliable.

关 键 词：近海排水口 BOD_(5) DO COD 线性关系 

分 类 号：X55[环境科学与工程—环境工程] X82