Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China.
J Environ Manage. 2024 Sep;367:122038. doi: 10.1016/j.jenvman.2024.122038. Epub 2024 Aug 3.
There are a large number of simple landfills in hilly areas, and the results of previous studies have shown that pollutants in landfills can spread via interflow and cause surface source pollution. The hybrid activated sludge-membrane aerated bioreactor (H-MABR) developed in a previous study can be used for the treatment of interflow with a low chemical oxygen demand (COD)/total nitrogen (TN) ratio, and it has been shown to be effective in laboratory simulations. To investigate the effectiveness of the H-MABR in treating interflow around landfills in real-world applications, an in-situ pilot-scale evaluation of the effectiveness of H-MABR operation was conducted at a landfill. The results indicated that the removal efficiencies of COD, TN, and ammonia nitrogen in interflow by H-MABR were 87.1 ± 6.0%, 80.9 ± 7.9%, and 97.9 ± 1.4%, respectively. The removal rate of TN reached 148.6-205.6 g-N/m·d. The concentration of each pollutant in the effluent was in accordance with China's "Standard for pollution control on the landfill site of municipal solid waste (GB16889-2008)," wherein the COD, TN, and ammonia nitrogen of effluent should be less than 100 mg/L, 40 mg/L, and 25 mg/L, respectively. The results of community composition analysis and PICRUSt analysis based on 16S rRNA gene sequencing showed that there were different dominant functional bacteria between the inner and outer rings, but functional genes involved in the nitrification-denitrification, assimilated nitrate reduction, and dissimilated nitrate reduction pathway were all detected. Furthermore, except for the nitrite oxidation gene narG, the abundance of which did not significantly differ between the inner and outer rings, the abundance of the other functional genes was higher in the outer ring than in the inner ring. An economic evaluation revealed that the operation cost of interflow treatment by the H-MABR was as low as ¥2.78/m; thus, the H-MABR is a shock-load-resistant and cost-effective technology for interflow treatment.
有大量的简易垃圾填埋场位于丘陵地区，之前的研究结果表明，填埋场中的污染物可以通过渗流传播，造成地表水源污染。之前的研究中开发的混合活性污泥-膜曝气生物反应器（H-MABR）可用于处理化学需氧量（COD）/总氮（TN）比低的渗流，并且在实验室模拟中已证明是有效的。为了研究 H-MABR 在实际应用中处理垃圾填埋场周围渗流的效果，在一个垃圾填埋场进行了原位中试规模的 H-MABR 运行效果评估。结果表明，H-MABR 对渗流中 COD、TN 和氨氮的去除率分别为 87.1±6.0%、80.9±7.9%和 97.9±1.4%。TN 的去除速率达到 148.6-205.6 g-N/m·d。出水各污染物浓度均符合我国《生活垃圾填埋场污染控制标准（GB16889-2008）》要求，即出水 COD、TN 和氨氮应分别小于 100mg/L、40mg/L 和 25mg/L。基于 16S rRNA 基因测序的群落组成分析和 PICRUSt 分析结果表明，内外环之间存在不同的优势功能菌，但均检测到硝化-反硝化、同化硝酸盐还原和异化硝酸盐还原途径的功能基因。此外，除了内外环之间亚硝酸氧化基因 narG 的丰度没有显著差异外，其他功能基因的丰度外环均高于内环。经济评价表明，H-MABR 处理渗流的运行成本低至 2.78 元/m，因此，H-MABR 是一种抗冲击负荷且具有成本效益的渗流处理技术。
