去除痕量邻苯二甲酸酯的活性炭选型与试验研究

Activated Carbon Selection and Experimental Study for Trace Phthalates Removal

为了提高饮水厂对微污染水体中邻苯二甲酸酯(PAEs)的去除效果,以活性炭为吸附剂,进行活性炭选型和炭柱吸附PAEs试验。结果表明,木质炭、煤质炭、果壳炭的吸附行为均符合Freundlich经验模型。当果壳炭投加量为8 g/L时,对邻苯二甲酸二丁酯(DBP)、邻苯二甲酸二(2-乙基己基)酯(DEHP)的去除率均达到100%,对邻苯二甲酸二甲酯(DMP)、邻苯二甲酸二乙酯(DEP)的吸附容量分别为14.712和5.143μg/g,高于煤质炭和木质炭的相应值。动态吸附试验中,果壳炭对4种PAEs的去除率均在85%以上,平衡浓度低于0.5μg/L。在PAEs进水浓度为5~20μg/L条件下进行果壳活性炭柱吸附试验,发现该深度处理工艺对PAEs的去除效果均满足《生活饮用水卫生标准》(GB 5749—2006)的要求,且在去除率和吸附稳定性上优于常规水处理工艺。

To improve the removal of phthalic acid ester( PAEs) from micro-polluted water,the activated carbon was used as an adsorbent in an experiment which focused on activated carbon selection and carbon column adsorption of PAEs. The results showed that the adsorption behavior of three activated carbons,namely charcoal,coal charcoal,and shell charcoal,was consistent with the Freundlich empirical model. When the dose of shell charcoal was 8 g/L,the removal rate of dibutyl phthalate( DBP) and di(2-ethylhexyl) phthalate( DEHP) reached 100%,and the adsorption capacity on dimethyl dicarbonate( DMP) and diethyl phthalate( DEP) was 14. 712 μg/g and 5. 143 μg/g,respectively,which were higher than the corresponding removal rates of coal charcoal and charcoal. The removal rates of shell charcoal on the four PAEs were more than 85%,and the equilibrium concentrations were less than 0. 5μg/L. The carbon column adsorption experiment was performed with the PAEs influent concentration of 5-20 μg/L. The removal efficiency of PAEs by the advanced treatment of activated carbon met the Standard for Drinking Water Quality( GB 5749-2006),and was superior to the conventional water treatment process in terms of removal efficiency and adsorption stability.