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以长三角比较有代表性的3处水源(太湖、钱塘江、金兰水库)为实验对象,研究不同消毒条件下9种卤乙酸(haloacetic acids,HAAs)的形成及其影响因素,并通过建立多元回归模型来评估水源水氯化后HAAs的形成.结果表明:HAAs的形成水平依次为太湖>钱塘江>金兰水库,且均以二卤乙酸(dihaloacetic acid,DHAA)、三卤乙酸(trihaloacetic acid,THAA)为主.二氯乙酸(dichloroacetic acid,DCAA)、总二卤乙酸(ΣDHAA)、HAA5(USEPA规定的5种HAAs)、HAA9(9种HAA的简称)的回归模型具有良好的预测潜力,准确率达83.3%~94.4%,而三氯乙酸(trichloroacetic acid,TCAA)、一溴二氯乙酸(bromodichloroacetic acid,BDCAA)、ΣTHAA(总三卤乙酸)模型的预测准确率较低,只有47.2%~61.1%.根据偏相关系数分析,影响DCAA、ΣDHAA、HAA5的关键的因子是溶解性有机碳;影响TCAA、ΣTHAA、HAA9的关键的因子是投氯量;影响BDCAA形成的最关键因子是溴离子.
Taking the representative three water sources in the Yangtze River Delta (Taihu Lake, Qiantang River and Jinlan Reservoir) as experimental subjects, the formation and influencing factors of nine kinds of haloacetic acids (HAAs) under different disinfection conditions were studied. Regression model was used to evaluate the formation of HAAs after water chlorination. The results showed that the formation of HAAs followed by Taihu> Qiantangjiang> Jinlan reservoirs, and all were treated with dihaloacetic acid (DHAA), trihaloacetic acid THAA) .The regression model of dichloroacetic acid (DCAA), total dihaloacetic acid (ΣDHAA), HAA5 (5 HAAs regulated by USEPA) and HAA9 (short for 9 kinds of HAA) has good predictive potential, The accuracies were 83.3% ~ 94.4%, while the prediction accuracy of trichloroacetic acid (TCAA), bromodichloroacetic acid (BDCAA) and ΣTHAA (total trihaloacetic acid) ~ 61.1% .According to partial correlation analysis, the key factor influencing DCAA, ΣDHAA and HAA5 is dissolved organic carbon; the key factor affecting TCAA, ΣTHAA and HAA9 is the dosage of chlorine; the most critical factor affecting the formation of BDCAA is bromine ion.