Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
Waste Manag. 2021 Jun 1;128:64-72. doi: 10.1016/j.wasman.2021.04.040. Epub 2021 May 6.
Large amounts of bioaerosols are generated during the treatment of landfill leachate, which poses potential threat to public health safety. In this study, the concentrations, particle size distribution, and microbial community of bioaerosols emitted from the low-pH biofilter (LPB) and neutral-pH biofilter (NPB) used to treat the odors from landfill leachate, as well as the effect of the inlet flow rate (IFR) and water-containing rate (WCR) were investigated. The results showed that the removal efficiency of the LPB for heterotrophic bacteria and the NPB for fungi were higher when the IFR was higher. The outlet concentrations (OCs) of heterotrophic bacteria, neutral sulfur bacteria, ammonia-oxidizing bacteria, nitrite-oxidizing bacteria, NO, and NO were negatively correlated with the IFR in the LPB, whereas those of fungi and acidophilic sulfur bacteria were positively correlated with the IFR. Inverse correlation between the OCs and IFR was exhibited in the NPB. The proportions of dominant microorganisms with large particle size (> 3.3 μm) reduced significantly after both the LPB and NPB, which was aggravated under higher WCR. The analysis of microbial community illustrated that the dominant heterotrophic bacteria were different, while the dominant fungi were similar in the bioaerosols between the LPB and NPB, respectively. Due to the different emission characteristics, bioaerosols in the LPB and NPB outlet should be distinguished and taken seriously.
大量的生物气溶胶在处理垃圾渗滤液时产生，这对公众健康安全构成潜在威胁。本研究调查了用于处理垃圾渗滤液臭气的低 pH 生物滤池（LPB）和中性 pH 生物滤池（NPB）中生物气溶胶的浓度、粒径分布和微生物群落，以及入口流量（IFR）和含水率（WCR）的影响。结果表明，当 IFR 较高时，LPB 对异养菌的去除效率和 NPB 对真菌的去除效率较高。LPB 中异养菌、中性硫菌、氨氧化菌、亚硝酸盐氧化菌、NO 和 NO 的出口浓度（OC）与 IFR 呈负相关，而真菌和嗜酸硫菌的 OC 与 IFR 呈正相关。NPB 中也表现出 OC 与 IFR 的反向相关性。LPB 和 NPB 后，大粒径（>3.3μm）的优势微生物比例显著降低，在较高 WCR 下加剧。微生物群落分析表明，LPB 和 NPB 生物气溶胶中的优势异养菌不同，而优势真菌相似。由于排放特征不同，LPB 和 NPB 出口处的生物气溶胶应加以区分并引起重视。
