氯化对二级处理出水中溶解性有机物结构的影响

Effect of Chlorination on the Structure of Dissolved Organic Matters in Secondary Effluent

以哈尔滨市W污水处理厂污水为研究对象,利用XAD树脂对二级处理出水中的溶解性有机物（DOM）进行分级分离.按照DOM在不同树脂上的吸附特性将其分为5个部分：疏水性有机酸（HPO-A）、疏水性中性有机物（HPO-N）、过渡亲水性有机酸（TPI-A）、过渡亲水性中性有机物（TPI-N）和亲水性有机物（HPI）.考察了二级处理出水中有机组分的组成分布、三卤甲烷生成势、紫外光谱和红外光谱.结果表明,二级处理出水中的主要成分是HPO-A和HPI,两者含量之和达70.8%.HPO-A是加氯消毒时产生三卤甲烷的主要有机组分,其三卤甲烷生成活性（STHMFP）为232.9μg/mg.而HPO-N、TPI-A、TPI-N和HPI的STHMFP介于100-125μg/mg之间.氯化反应后,HPO-A、HPO-N、TPI-A和HPI的紫外-可见吸光度均降低,而TPI-N则相反.并且HPO-A、HPO-N、TPI-A和TPI-N中的O—H、C= C和苯环的含量降低,而C—O的含量升高,还生成了C =O和C—Cl.

Dissolved organic matter in the secondary effluent from the W wastewater treatment plant（Harbin） was fractionated using XAD resins into five fractions： hydrophobic acid（HPO-A）,hydrophobic neutral（HPO-N）,transphilic acid（TPIA）,transphilic neutral（TPI-N） and hydrophilic fraction（HPI）.The distribution,trihalomethane formation potential（THMFP）,UV-Vis and FTIR spectra of organic fractions in the secondary effluent were examined.XAD fractionation results showed that HPO-A and HPI dominated in the secondary effluent,collectively accounting for about 70.8%.HPO-A was the main precursors for THMFP following chlorination.HPO-A had the highest specific THMFP（STHMFP） and averaged 232.9μg/mg.The STHMFP of HPO-N,TPI-A,TPI-N and HPI ranged from 100μg/mg to 125μg/mg.Chlorination resulted in increased UV-Vis absorbance for TPI-N and decreased UV-Vis absorbance for HPO-A,HPO-N,TPI-A and HPI.After chlorination,O—H,C=C and aromatic ring were found to decrease while C—O was observed to increase for HPO-A,HPO-N,TPI-A and TPI-N.In addition,C=O and C—Cl were found to occur as by-products from the chlorination reaction.