Landfill leachate (LFL) is a very complex effluent that poses considerable threats to humans and to the environment. Selecting the appropriate process for leachate treatment still poses potential concern and challenge for the operation in municipal landfills. The current study aims to assess stabilized leachate degradation through coagulation by using different chemicals (Al₂(SO₄)₃, FeCl₃, FeSO₄). Thereafter, a complementary process using two Candida strains (Candida kefyr and Candida glabrata) is investigated as a biological treatment of treated LFL. Furthermore, the phytotoxicity of treated LFL is examined by seed germination/root elongation tests using barley and tomato seeds. Upon experimentation and research, the results reveal that the optimum removal efficiency for chemical oxygen demand (COD) and ammonium (NH₄⁺-N) is 73.3% and 53.5%, respectively, when using the combined process. The removal efficiency of toxic metal elements (Fe, Pb, and Zn) is improved significantly (up to 80%). In addition, physiological and biochemical analyses confirm that the combined process allows a significant toxicity reduction. The obtained outcome is encouraging and supports the possible use of the treated LFL as a fertilizer for plant growth.

中文翻译：

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在发酵前通过混凝处理对渗滤液进行解毒并可能在灌溉中重复使用

垃圾渗滤液 (LFL) 是一种非常复杂的污水，对人类和环境构成相当大的威胁。选择合适的渗滤液处理工艺仍然是城市垃圾填埋场运营的潜在关注和挑战。目前的研究旨在通过使用不同的化学品（Al ₂ (SO ₄ ) ₃、FeCl ₃、FeSO ₄）通过混凝来评估稳定的渗滤液降解。此后，使用两种念珠菌菌株（Candida kefyr和Candida glabrata ）的互补过程) 被研究作为处理过的 LFL 的生物处理。此外，使用大麦和番茄种子通过种子发芽/根伸长试验检查处理过的 LFL 的植物毒性。经试验研究，结果表明，联合工艺对化学需氧量（COD）和氨氮（NH ₄ ⁺ -N）的最佳去除效率分别为73.3%和53.5%。对有毒金属元素（Fe、Pb 和 Zn）的去除效率显着提高（高达 80%）。此外，生理和生化分析证实，联合过程可以显着降低毒性。获得的结果令人鼓舞，并支持将处理过的 LFL 用作植物生长的肥料。