选择性吸附法处理含表面活性剂和多环芳烃的土壤淋洗液研究

比较研究了H103树脂、活性炭、沸石、硅藻土和膨润土等5种吸附剂对土壤淋洗液中TX-100与PAHs的吸附性能.批实验结果表明,H103树脂、活性炭、沸石、硅藻土和膨润土吸附后,淋洗液中T-PAHs及TX-100浓度分别为0.03和0 mg·L~(-1)、0.16和3623 mg·L~(-1)、15.21和6175 mg·L~(-1)、15.98和6555 mg·L~(-1)、9.49和4332 mg·L~(-1),选择性吸附系数排序依次为活性炭膨润土沸石硅藻土H103树脂.其中,活性炭能够去除淋洗液中99%的PAHs,同时保留51.33%的TX-100回收再利用,选择吸附系数达到109.5.活性炭固定床实验中,由淋洗液溶质的穿透曲线计算出物质的吸附容量.当空隙体积为2.5-7PV时,活性炭能够去除淋洗液中72%的PAHs,同时保留81%的TX-100,平均选择吸附系数为10.08.由此可见,活性炭固定床可有效处理含表面活性剂土壤淋洗液中的多环芳烃,同时实现表面活性剂的回收再利用.

Treatment of washing leachate containing polycyclic aromatic hydrocarbon and surfactant by selective sorption

In the study, we chose five adsorbents including resin, activated carbon, zeolite, diatomite and bentonite to explore the adsorption characteristics of TX-100 and PAHs in the organic washing leachate. The batch experiment results show that the concentrations of PAHs and TX-100 after the adsorption of the five materials are 0.03 and 0 mg·L^-1, 0.16 and 3623 mg·L^-1, 15.21 and 6175 mg·L^-1, 15.98 and 6555 mg·L^-1, 9.49 and 4332 mg·L^-1, respectively. The selective adsorption coefficients from high to low were activated carbon, bentonite, zeolite, diatomite and resin. The adsorption capacity was calculated based on breakthrough curve. According to results, the activated carbon could remove 99% PAHs and retain 51.33% TX-100 in the leachate, with a selective adsorption coefficient of 109.5. The activated carbon could remove 72% PAHs and keep 81% TX-100 available in the lechate when the pore volume ranged from 2.5 to 7 PV, having a selective adsorption coefficient of 10.08. The activated carbon fixed bed can effectively remove the PAHs in the leachate in the presence of surfactant, realizing the recycling and reusing of the surfactant at the same time.