College of Environmental Science and Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China.
Environ Sci Pollut Res Int. 2014;21(13):8157-66. doi: 10.1007/s11356-014-2755-5. Epub 2014 Mar 28.
Sewage sludge (SS) with corn stalk (CS) was used to prepare SS-based activated carbon (SAC) by pyrolysis with ZnCl2. The effects of mixing ratio on surface area and pore size distribution, elemental composition, surface chemistry, and morphology were investigated. The results demonstrated that the addition of CS into SS samples improved the surface area (from 92 to 902 m(2)/g) and the microporosity (from 1.2 to 4.1%) of the adsorbents and, therefore, enhancing the adsorption performance. The removal of leachate chemical oxygen demand (COD) was also determined. It was found that the COD removal rate reached 85% at pH 4 with the SAC (90 wt% CS) dosage of 2% (g/mL) and an adsorption time of 40 min. The adsorption experimental data were fitted by both Langmuir and Freundlich adsorption isotherms. Long-chain alkanes and refractory organics were found in raw leachate, but could be removed by SAC largely.
污水污泥（SS）与玉米秸秆（CS）混合，经 ZnCl2 热解制备 SS 基活性炭（SAC）。考察了混合比对表面积和孔径分布、元素组成、表面化学和形态的影响。结果表明，CS 的添加提高了吸附剂的比表面积（从 92 增加到 902 m2/g）和微孔（从 1.2 增加到 4.1%），从而提高了吸附性能。还测定了浸出液化学需氧量（COD）的去除率。结果发现，在 pH 值为 4 时，SAC（CS 含量为 90wt%）用量为 2%（g/mL），吸附时间为 40 min 时，COD 去除率达到 85%。吸附实验数据同时符合 Langmuir 和 Freundlich 吸附等温线。在原浸出液中发现了长链烷烃和难降解有机物，但 SAC 可有效去除。
