近海排水口水质BOD5、DO和COD的线性关系分析
Analysis on the linear relations about BOD5,DO and COD in the water of marine outfalls
金兴良 1孙滔滔 2唐天均 2廖国威 3王煜 4戴知广3
作者信息
- 1. 深圳市环境科学研究院,广东深圳 518001;深圳市生态环境监测站,广东深圳 518001
- 2. 深圳市环境科学研究院,广东深圳 518001
- 3. 深圳市环境科学研究院,广东深圳 518001;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
- 4. 深圳市生态环境监测站,广东深圳 518001
- 折叠
摘要
以BOD5、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BOD5之间存在较好的一元线性关系;而DO分别与BOD5、COD的一元线性关系均较弱.COD与BOD5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BOD5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BOD5、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.
Abstract
The relations about BOD5,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 line-arity existed between COD and BOD5,but relatively weak linearity between BOD5 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 func-tion between COD and BOD5.Monitoring data of BOD5,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 val-ues fitted by the binary linear function and COD values detected in a lab,was less than 25％,which ac-corded with the precession of quality control criterion,and verified the binary linear function reliable.
关键词
近海排水口/BOD5/DO/COD/线性关系Key words
linear relation/BOD5/DO/COD/marine outfalls引用本文复制引用
出版年
2024
NETL
NSTL
万方数据