Beijing Key Lab for Source Control Technology of Water Pollution, Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science & Engineering, Beijing Forestry University, Beijing, 100083, China.
College of Environment, Zhejiang University of Technology, Hangzhou, 310014, China.
Chemosphere. 2021 Sep;279:130924. doi: 10.1016/j.chemosphere.2021.130924. Epub 2021 May 17.
Emission of dimethyl sulfide (DMS) and dimethyl disulfide (DMDS) during sludge aerobic composting has limited the use and development of this economical sludge treatment process. In this study, cheap and easily available sludge was used as raw material for the preparation of adsorbents to eliminate DMS and DMDS. A series of sludge-based activated carbons (SACs) were prepared by acid or base activation, and coconut shell mix was also assessed. The results revealed that SAC preparation by KOH activation without coconut shell mix could significantly enhance the surface area and pore volume of SAC, and showed the maximum adsorption capacity for DMS (53.45 mg g) and DMDS (151.28 mg g). In addition, SAC had a good adsorption effect on a mixture of DMS and DMDS. The SAC adsorbents could efficiently adsorb DMS and DMDS after four cycles of regeneration. Thermodynamic and kinetic analyses demonstrated that adsorption between the SAC and DMS/DMDS was via physical adsorption. The SAC developed in this study utilized waste in a useful way that could significantly reduce the cost of adsorbents and use them for odor elimination during sludge aerobic composting.
在污泥好氧堆肥过程中，二甲基硫（DMS）和二甲基二硫（DMDS）的排放限制了这种经济有效的污泥处理工艺的使用和发展。在本研究中，使用廉价且易得的污泥作为制备吸附剂的原料，以去除 DMS 和 DMDS。通过酸或碱活化制备了一系列基于污泥的活性炭（SAC），并评估了椰子壳混合物。结果表明，不添加椰子壳混合物的 KOH 活化制备的 SAC 可以显著提高 SAC 的表面积和孔体积，并表现出对 DMS（53.45mg/g）和 DMDS（151.28mg/g）的最大吸附能力。此外，SAC 对 DMS 和 DMDS 的混合物也有良好的吸附效果。SAC 吸附剂在经过四次再生循环后可以有效地吸附 DMS 和 DMDS。热力学和动力学分析表明，SAC 与 DMS/DMDS 之间的吸附是通过物理吸附实现的。本研究开发的 SAC 以废物利用的方式利用了废物，可以显著降低吸附剂的成本，并在污泥好氧堆肥过程中用于消除异味。
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