论文部分内容阅读
提出新的DBPs生成模型,并进行DBPFP测定方法优化,优化因素包括投氯量、消毒时间和p H-温度联合因素。在优化投氯量时,发现低投氯量下五种DBPs生成量与投氯量之间存在明显的线性关系,线性拟合的确定性系数(R2)均大于0.980。优化消毒时间时,提出了ttrend的概念,发现8种DBPs的ttrend均包括3 d这一时间点。在pH-温度联合因素优化时,得到CHCl_3、CHCl_2Br、CHClBr_2和C_2Cl_4生成量响应曲面拟合的R2均大于0.970,拟合效果较好;但三种卤乙酸生成量响应曲面拟合的R2为0.671~0.874,拟合效果一般。这可能是因为pH-温度联合因素对卤乙酸生成量的影响较小,或试验过程引入过大误差造成模型残差过大。得到优化的DBPFP测定方法是投氯量为5 mg/L,消毒时间为3 d,pH值为7.5,温度为11℃。可根据DBPs生成量与三个优化因素的关系,使用DBPs生成模型和DBPFP测定值计算出不同条件下水样消毒过程中的DBPs生成量。
A new generation model of DBPs was proposed and the method of DBPFP determination was optimized. The optimization factors included the dosage of chlorine, disinfection time and p H-temperature. When the dosage of chlorine was optimized, it was found that there was a clear linear relationship between the amount of five DBPs generated and the dosage of chlorine under the low dosage of chlorine. The deterministic coefficients (R2) of the linear fit were both greater than 0.980. When optimizing the disinfection time, the concept of ttrend was proposed and it was found that the ttrends of the eight kinds of DBPs all included the time point of 3 days. When the combination of pH and temperature was optimized, the R2 of the response curves of CHCl_3, CHCl_2Br, CHClBr_2 and C_2Cl_4 were more than 0.970, and the fitting effect was better. However, R2 of the three haloacetate yield response curves fitting was 0.671 ~ 0.874, the fitting effect is average. This may be because the combination of pH and temperature has little effect on the yield of haloacetic acid, or too large error in the test process leads to excessive model residuals. The optimized method for determination of DBPFP was 5 mg / L of chlorine, 3 days of disinfection, pH value of 7.5 and temperature of 11 ℃. Based on the relationship between the amount of DBPs generated and the three optimization factors, DBPs generation models and DBPFP measurements were used to calculate the amount of DBPs generated during water samples disinfection.