预氧化与混凝对水源水中DBPsFP的协同去除规律

Study on removal rule of DBPsFP in source water by pre-oxidation and coagulation

以水库水为研究对象,研究不同条件下,预氧化与混凝对天然水库水氯化消毒过程中消毒副产物前体物(DBPsFP)的协同控制效果.结果表明,随着高锰酸钾投量的增加,三氯甲烷(TCM)、三氯丙酮(1,1,1-TCP)、二氯乙酸(DCAA)和三氯乙酸(TCAA)的质量浓度逐渐下降,二氯丙酮(1,1-DCP)、二氯乙腈(DCAN)的质量浓度先下降后上升,在高锰酸钾投加量为4 mg/L时处理效果最好;随着预氧化时间的延长,1,1-DCP、DCAN、TCM、DCAA和TCAA的质量浓度逐渐下降、1,1,1-TCP的质量浓度逐渐上升,综合分析,预氧化40 min时处理效果最好;在pH值从5增加到9时,1,1-DCP、1,1,1-TCP、DCAN、DCAA和TCAA的质量浓度逐渐下降,TCM的质量浓度先降低后升高;随着温度的升高,TCM、1,1,1-TCP、DCAA和TCAA的质量浓度逐渐上升,1,1-DCP和DCAN的质量浓度先升高后降低.

Taking the water of a reservoir as the research object,pre-oxidation and coagulation on disinfection by-product precursor(DBPsFP)collaborative control during chlorination disinfection of natural reservoir water.The results showed that,with the increase of the potassium permanganate dosage,the concentration of trichloromethane(TCM),1,1,1-trichloroacetone(1,1,1-TCP),dichloroacetic acid(DCAA)and trichloroacetic acid(TCAA)decreased gradually,the concentration of 1,1-dichloroacetone(1,1-DCP)and dichloroacetonitrile(DCAN)decreased at first and then increased,the removal efficiency of DBPs was at highest when the dosage of potassium permanganate was 4 mg/L.The concentration of 1,1-DCP,DCAN,TCM,DCAA and TCAA decreased gradually,the concentration of 1,1,1-TCP increased gradually with the prolongation of pre-oxidation time,overall,the optimum pre-oxidation time was 40 minute.The concentration of 1,1-DCP,1,1,1-TCP,DCAN,DCAA and TCAA decreased gradually,the concentration of TCM decreased at first and then increased as pH rose from 5 to 9.The concentration of TCM,1,1,1-TCP,DCAA and TCAA increased gradually,the concentration of 1,1-DCP and DCAN increased at first and then decreased with the increase of reaction temperature.