含硫气体是垃圾填埋场恶臭的主要来源,这已经成为环境污染和人类健康的大问题。生物覆盖物有望用于处理垃圾填埋场的气味,具有耐用性和环境友好性的优点。在这项研究中,木炭污泥堆肥被用作新型替代垃圾填埋场的主要有效成分,并在9种不同的操作条件下模拟了城市固体废物填埋过程中含硫气味的原位控制。结果表明,五种含硫气味(硫化氢,H2S;甲硫醇,CH3SH;二甲基硫醚,CH3SCH3;乙硫醇,CH3CH2SH;二硫化碳,CS2)被生物覆盖物监测和移除,对H2S的最高去除效率为77.18%,CH3SH为87.36%,反应器8#中CH3SCH3为92.19%,在反应器3#中,CH3CH2SH为95.94%,CS2为94.44%。正交试验表明,影响含硫气味去除效果的因素由高到低依次为:温度>重量比>湿度。20%重量比的参数组合,温度25°C,基于去除效率和经济效益的考虑,建议含水量为30%。分析了生物覆盖物内部硫转化的机理。大多数有机硫首先降解为还原硫化物或元素硫,然后氧化为硫酸盐,可以在层中稳定作为最终状态。在这个过程中,硫氧化细菌发挥了很大的作用,以及它们在1号反应堆中的分布,5#,8#被特别监测。缓生根瘤菌科和红螺旋菌科是利用硫化物作为物质产生硫酸盐和元素硫的优势种,分别。根据OUT的结果,这些硫氧化细菌的生物多样性,这些微生物,被证明受不同参数的影响。这些结果表明,用竹炭堆肥改性的新型替代垃圾填埋场覆盖物可有效去除垃圾填埋场中的硫气味。同时,这些发现对通过参数调整解决垃圾填埋场气味问题具有直接意义。
Sulfur-containing gases are main sources of landfill odors, which has become a big issue for pollution to environment and human health. Biocover is promising for treating landfill odors, with advantages of durability and environmental friendliness. In this study, charcoal sludge compost was utilized as the main effective component of a novel alternative landfill cover and the in situ control of sulfur-containing odors from municipal solid waste landfilling process was simulated under nine different operating conditions. Results showed that five sulfur-containing odors (hydrogen sulfide, H2S; methyl mercaptan, CH3SH; dimethyl sulfide, CH3SCH3; ethylmercaptan, CH3CH2SH; carbon disulfide, CS2) were monitored and removed by the biocover, with the highest removal efficiencies of 77.18% for H2S, 87.36% for CH3SH, and 92.19% for CH3SCH3 in reactor 8#, and 95.94% for CH3CH2SH and 94.44% for CS2 in reactor 3#. The orthogonal experiment showed that the factors influencing the removal efficiencies of sulfur-containing odors were ranked from high to low as follows: temperature > weight ratio > humidity content. The combination of parameters of 20% weight ratio, 25°C temperature, and 30% water content was more recommended based on the consideration of the removal efficiencies and economic benefits. The mechanisms of sulfur conversion inside biocover were analyzed. Most organic sulfur was firstly degraded to reduced sulfides or element sulfur, and then oxidized to sulfate which could be stable in the layer as the final state. In this process, sulfur-oxidizing bacteria play a great role, and the distribution of them in reactor 1#, 5#, and 8# was specifically monitored. Bradyrhizobiaceae and Rhodospirillaceae were the dominant species which can utilize sulfide as substance to produce sulfate and element sulfur, respectively. Based on the results of OUTs, the biodiversity of these sulfur-oxidizing bacteria, these microorganisms, was demonstrated to be affected by the different parameters. These results indicate that the novel alternative landfill cover modified with bamboo charcoal compost is effective in removing sulfur odors from landfills. Meanwhile, the findings have direct implications for addressing landfill odor problems through parameter adjustment.