不同方法测得稀土废水中COD值之间的数学模型研究

发布时间：2018-06-16 23:51

本文选题：COD + 稀土废水　；参考：《赣南师范学院》2015年硕士论文

【摘要】：化学需氧量(COD)作为反映水体受还原性物质包括有机物、亚硝酸盐、亚铁盐、硫化物等污染程度和评价水污染的一项综合性指标,国家不仅制定各行业的严格排放标准,而且环境监测部门还要随时按照有关标准测定方法进行实验跟踪测定,既是监督企业依法排放,更是为环保执法调查取证所采取的必要措施。赣州是我国离子吸附型稀土的主要集中地,稀土工业的快速发展,在带来丰厚财富的同时,也带来了一定程度的废水、废气、废渣等污染物的排放困扰,严重污染周围环境。然而,稀土生产过程中所产生的含有机物废水成分复杂,严重地影响化学需氧量的测定。且受到复杂因素干扰、实验条件的局限及每种COD的测定方法的氧化率不同,结果会使得同一水样用不同方法测定的COD值不同。因此,探究COD值测定方法之间的内在关系方程显得十分必要。本文用SPSS软件数据统计分析,Excel软件模型拟合与验证,研究了重铬酸钾法、碘化钾碱性高锰酸钾法、氯气校正法对赣南22家稀土公司总排口废水和车间排口废水,经科学采样的150多组水样平行测定数据,以探究COD值测定方法之间的内在方程,结果得到:(1)采用碘化钾碱性高锰酸钾法与重铬酸钾法测定稀土公司排口废水化学需氧量所得的COD_(OH.KI)与COD_(Cr)的模型汇总bR方、F的sig.和回归标准化残差标准P-P图所有数据观测累计散点均与期望累计概率结果显示,COD_(OH.KI)与COD_(Cr)线性效果显著;但常量对应t值的Sig.0.05,说明常量不显著。通过Excel软件进行模型拟合,建立COD_(OH.KI)与COD_(Cr)之间的数学方程为COD_(Cr)=4.8843COD_(OH.KI)。(2)采用碘化钾碱性高锰酸钾法与氯气校正法测定稀土公司排口废水化学需氧量所得的COD_(OH.KI)与COD_(Cl)校正的模型汇总bR方、F的sig.及回归标准化残差标准P-P图所有数据观测累计散点均与期望累计概率结果表明,COD_(OH.KI)与COD_(Cl)校正线性效果显著;但常量对应t值的Sig.为0.05,得到常量不显著。通过Excel软件进行模型拟合,建立COD_(OH.KI)与COD_(Cl)校正之间的数学方程为COD_(Cl)校正=4.6602COD_(OH.KI)。(3)上述二组方程经模型检验和作图验证,在实践中有着非常好的应用价值和指导作用,且COD_(OH.KI)检测范围可达0.2~5000mg/L。
[Abstract]:Chemical oxygen demand (COD) is a comprehensive index to reflect the degree of pollution and evaluate water pollution by reducing substances such as organic matter, nitrite, ferrous salt and sulfide. The country not only formulates strict discharge standards for various industries, Moreover, the environmental monitoring department should carry out the experimental tracking and determination according to the relevant standard measurement method at any time, which is not only to supervise the enterprises to discharge according to the law, but also to take necessary measures for the investigation and evidence collection of environmental protection law enforcement. Ganzhou is the main concentration of ion adsorbed rare earths in China. The rapid development of rare earth industry not only brings rich wealth, but also brings a certain degree of waste water, waste gas, waste residue and other pollutants, which seriously pollute the surrounding environment. However, the composition of organic wastewater produced in rare earth production process is complex, which seriously affects the determination of chemical oxygen demand. Because of the interference of complex factors, the limitation of experimental conditions and the different oxidation rate of each COD determination method, the COD values of the same water samples determined by different methods will be different. Therefore, it is necessary to explore the internal equation of COD value determination method. In this paper, the statistical analysis of SPSS software data and Excel software model fitting and verification are used to study the application of potassium dichromate method, potassium iodide alkaline permanganate method and chlorine gas correction method to 22 rare earth companies in south Jiangxi province. In order to explore the intrinsic equation between the methods of COD measurement, more than 150 groups of water samples were measured in parallel by scientific sampling. Results: (1) the model of determining the chemical oxygen demand of waste water from rare earth company by potassium iodide alkaline potassium permanganate method and potassium dichromate method was obtained. The results of the cumulative divergence points and the expected cumulative probability of all the data observed in the regression standardized residual standard P-P chart show that the linear effect between COD-to-OH.KI and CODStamp Cr-1 is remarkable, but the constant corresponds to Sig.0.05 of t value, which indicates that the constant is not significant. By using Excel software, the mathematical equation between CODStat OH.KI) and CODSP Cr2 was established. The mathematical equation was CODSHAKHKI (4. 8843CODX). Ki. 2) the method of alkaline potassium permanganate iodide and the calibration method of chlorine gas were used to determine the chemical oxygen demand of waste water of rare earth company, and the model was used to sum up the sig of BR square F. (2) the method of determining the chemical oxygen demand of waste water of rare earth company by alkaline potassium permanganate method and the method of chlorine gas correction were used to determine the chemical oxygen demand of waste water of rare earth company. The results of cumulative divergence points and expected accumulative probabilities of all data observed in the regression standardized residual standard P-P map show that the calibration linear effect of CODSP OH.KI) and CODK _ 1) is remarkable, but the constant corresponds to the Sig of t value. 0. 05, the obtained constant is not significant. By using Excel software, the mathematical equation between CODStack OH.KI) and CODKI correction is established. The mathematical equation is CODS / Cl).) the above two sets of equations are verified by model test and charting. The above two equations have very good application value and guiding function in practice, and the detection range of CODX OH.KI is up to 0.2000mg / L 路L ~ (-1), and the above two sets of equations are proved to be of great application value and guidance in practice, and the detection range of CODX / OH.KI can be as high as 0.2000mg / L, and the above two sets of equations are proved to be of great application value and guidance in practice.
【学位授予单位】：赣南师范学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X832;O652

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