Long Yuyang, Zhang Siyuan, Fang Yuan, Du Yao, Liu Weijia, Fang Chengran, Shen Dongsheng
Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310012, China.
Key Laboratory of Recycling and Eco-treatment of Waste Biomass of Zhejiang Province, Zhejiang University of Science and Technology, Hangzhou, 310023, China.
Biodegradation. 2017 Dec;28(5-6):327-335. doi: 10.1007/s10532-017-9799-4. Epub 2017 Jul 3.
Municipal solid waste landfills are responsible for odors affecting the environment and human health. Dimethyl sulfide (DMS) is one of the major odorous compounds known for its low odor threshold and wide distribution. This study examined the generation, migration and emission of DMS in four artificial landfill-simulating reactors: Reactor 1 and Reactor 2, running under anaerobic and semi-aerobic conditions, respectively, without leachate recirculation; and Reactor 3 and Reactor 4, running under anaerobic and semi-aerobic conditions, respectively, with leachate recirculation. From the odor control perspective, aeration can efficiently inhibit maximum DMS headspace concentration by 31.7-93.7%, especially with the functioning of leachate recirculation. However, leachate recirculation in anaerobic conditions may double the DMS emission concentration but may also shorten the period over which DMS is effective because of the upward migration of liquid DMS in the recirculated leachate. The DMS generation was active in the acidification and methane fermentation phase of the simulated landfill and was possibly affected by the volatile fatty acid concentration, chemical oxygen demand, total organic carbon concentration and pH of the leachate, as well as total organic carbon in the refuse. Most significantly, DMS emission can be effectually dealt with by aeration along with leachate recirculation.
城市固体垃圾填埋场是造成影响环境和人类健康气味的原因。二甲基硫醚（DMS）是主要的有气味化合物之一，以其低气味阈值和广泛分布而闻名。本研究考察了二甲基硫醚在四个模拟垃圾填埋场的反应器中的产生、迁移和排放情况：反应器1和反应器2分别在厌氧和半好氧条件下运行，且无渗滤液回流；反应器3和反应器4分别在厌氧和半好氧条件下运行，但有渗滤液回流。从气味控制的角度来看，曝气能够有效抑制二甲基硫醚顶空最大浓度达31.7% - 93.7%，特别是在渗滤液回流起作用时。然而，厌氧条件下的渗滤液回流可能使二甲基硫醚排放浓度加倍，但由于液态二甲基硫醚在回流渗滤液中的向上迁移，也可能缩短二甲基硫醚起作用的时间。在模拟垃圾填埋场的酸化和甲烷发酵阶段，二甲基硫醚的产生较为活跃，其可能受到渗滤液中挥发性脂肪酸浓度、化学需氧量、总有机碳浓度和pH值以及垃圾中总有机碳的影响。最显著的是，通过曝气以及渗滤液回流可以有效处理二甲基硫醚的排放。
