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首页> 外文期刊>The Science of the Total Environment >Treatment train for mature landfill leachates: Optimization studies
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Treatment train for mature landfill leachates: Optimization studies

机译：成熟垃圾填埋场渗滤液治疗火车：优化研究

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In the current study, a treatment train strategy for urban mature leachates, comprising biological and physicochemical processes, was tested for full legal compliance. The leachate presents a high organic and nitrogen content (1.1 g C/L; 3.6 g O-2/L; 2.0 g N/L) and low biodegradability (BOD5/COD 0.05). In the first stage, a sequential batch reactor (SBR), operated in a 24 h-cycle mode (15 h aeration +8.5 h anoxic, with methanol as external carbon source +0.5 h settling), was tested for total nitrogen (TN) removal. The maximum daily TN load that could be treated, reaching the legal limit ( 15 mg N/14, increased by 50% with the rise in temperature from 20 to 30 degrees C. For the following coagulation stage, the highest dissolved organic carbon (DOC) removal (64%) and lower final turbidity (33 NTU) were obtained with 240 mg Fe3+/L, at pH 3.0. The jar-tests, comparing nitrified (L-NIT) and nitrified/denitrified (L-N/D) leachate, stressed the effect of the leachate alkalinity, generated during the denitrification reaction, on process efficiency. For the coagulated LN,D., with alkalinity of 1.1 g CaCO3 L, the final concentration of sulfate was only slightly below the legal limit ( 2 g/L). A photo-Fenton (PF) oxidation process (pH range of 2.8-3.0, 60 mg Fe2+/L), as third treatment step, promoted a significant enhancement on leachate biodegradability, consuming 75 mM of H2O2 and 8.9 kl 1 of accumulated UV energy, to achieve an effluent that can be further biologically treated in compliance with the COD discharge limit (150 mg O-2, L) into water bodies. Biological continuous mode tests using a conventional activated sludge process, with an hydraulic retention time (HRT) of 12 h, allowed to obtain COD and TSS values (107 +/- 3 and 50 +/- 2 mg/L, respectively) below the legal limit. (C) 2019 Elsevier B.V. All rights reserved.
机译：在目前的研究中，测试了包括生物和物理化学过程的城市成熟渗滤液的治疗火车策略，以进行全法律遵守。渗滤液呈现高有机和氮含量（1.1g C / L; 3.6g O-2 / L; 2.0g N / L）和低生物降解性（BoD5 / COD 0.05）。在第一阶段，用24h循环模式（15h曝气+8.5h杀氧液，用甲醇作为外部碳源+0.5h沉淀）进行顺序间歇式反应器（SBR），进行总氮气（TN）移动。可以治疗的最大每日TN负荷达到法定极限（<15mg N / 14，随着下列凝血阶段的最高凝血阶段，温度升高，增加了50％，升高了50％。在pH3.0处，在240mg Fe 3 + / L中，获得除去（64％）和更低的最终浊度（33 nTU）。罐试验，比较硝化（L-镍氢）和硝化/解硝化（LN / D）渗滤液，强调渗滤液碱度的效果，在反硝化反应期间产生的，对工艺效率产生。用于凝结的LN，D.，含有1.1g CaCO3 L的碱度，硫酸盐的最终浓度仅略低于法定限制（<2 G / L）。作为第三处理步骤的光芬顿（PF）氧化过程（pH范围为2.8-3.0,60mg FE2 + / L），促进了对渗滤液生物降解性的显着提高，消耗75毫米H2O2和8.9 KL 1累积的紫外线能量，实现流出物，可以进一步依全生物学治疗COD放电限制（150mg O-2，L）进入水体。使用常规活性污泥工艺的生物连续模式试验，液压保留时间（HRT）为12小时，允许获得鳕鱼和TSS值（分别为107 +/- 3和50 +/- 2 mg / L）以下法律限制。 （c）2019 Elsevier B.v.保留所有权利。

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