Post-Graduate Program in Environmental Engineering - PPGCTA, Department of Sanitary and Environmental Engineering, Paraíba State University (UEPB), Bodocongó, 58429500 Campina Grande, Paraíba State, Brazil.
Post-Graduate Program in Environmental Engineering - PPGCTA, Department of Sanitary and Environmental Engineering, Paraíba State University (UEPB), Bodocongó, 58429500 Campina Grande, Paraíba State, Brazil.
Sci Total Environ. 2023 Oct 1;893:164870. doi: 10.1016/j.scitotenv.2023.164870. Epub 2023 Jun 15.
Sanitary landfills are widely accepted and promoted as the environmentally friendly way to properly dispose of solid waste. However, a harmful aspect is the leachate generation and management, which are currently recognized as one of the greatest challenges in the environmental engineering field. Due to the high leachate recalcitrance, Fenton treatment has been accepted as a viable and efficient treatment process, which significantly reduces the organic matter: 91 % of COD; 72 % of BOD5; and 74 % of DOC. However, the acute toxicity of leachate must be assessed, mainly after the Fenton process, with the view of performing a low-cost biological post-treatment of the effluent. Despite the high redox potential, degrading 185 organic chemicals compounds identified in raw leachate, the present work reports a removal efficiency of almost 84 %, counting 156 organic compounds removed, and almost 16 % of persistent compounds. After Fenton treatment, 109 organic compounds were identified, beyond the persistent fraction of almost 27 %, wherein 29 organic compounds remained unchanged after Fenton treatment, counting 80 new short chain and lower complexity organic compounds formed. Despite the biogas production ratio increase (3-6 times), and significant enhancement of the biodegradable fraction susceptible to oxidation in respirometric test, a higher reduction in the oxygen uptake rate (OUR) was identified after Fenton treatment due to persistent compounds and their bioaccumulation. Additionally, the D. magna bioindicator parameter indicated that treated leachate is three times more toxic than raw leachate.
卫生填埋场被广泛接受和推广，是一种妥善处理固体废物的环保方式。然而，其渗滤液的产生和管理是一个有害的方面，这是当前环境工程领域面临的最大挑战之一。由于渗滤液的高稳定性，芬顿处理已被认为是一种可行且高效的处理工艺，可以显著降低有机物：化学需氧量（COD）的 91%；生化需氧量（BOD5）的 72%；和溶解有机碳（DOC）的 74%。然而，必须评估渗滤液的急性毒性，主要是在芬顿工艺之后，以便对废水进行低成本的生物后处理。尽管具有高氧化还原电位，可降解原始渗滤液中鉴定出的 185 种有机化学品，但本工作报告的去除效率几乎为 84%，计数去除了 156 种有机化合物，几乎 16%的持久性化合物。经过芬顿处理后，鉴定出 109 种有机化合物，除了持久性物质几乎占 27%之外，其中 29 种有机化合物在芬顿处理后没有变化，形成了 80 种新的短链和低复杂度的有机化合物。尽管沼气产量比增加（3-6 倍），并且呼吸计测试中可氧化的可生物降解部分显著增强，但由于持久性化合物及其生物累积，芬顿处理后发现耗氧速率（OUR）的降低更大。此外，大型蚤生物指示剂参数表明，处理后的渗滤液比原始渗滤液毒性高 3 倍。
