Landfill leachates contain a variety of contaminants including phosphorus, whose entry into the surface waters should be restricted given the eutrophication risks. In this study, we investigated the utility of the ferric iron bioreduction process to remove phosphorus from municipal landfill leachate. An anaerobic bioreduction experiment was conducted in diluted leachate (1:5), in the presence of Shewanella sp. (10⁸ cell mL⁻¹). Two iron minerals, hematite (H) and nontronite (NAU-2) were also employed as Fe(III) sources. Serial sampling was carried out during incubation at 0, 2, 5, 10, 15, 20, 25, and 30 days. The results confirmed that bioreduction of Fe(III) occurred in the presence of both iron minerals but more extensively in the presence of NAU-2. Phosphate was precipitated chemically as struvite during the first days of the experiment, correlated to the high initial concentrations of ammonium and magnesium in the leachate. Subsequently, phosphate removal was shown to be proportional to biological Fe(II) generation and creating the conditions for precipitation of vivianite. Overall, phosphate removal from leachate in suspensions containing hematite or NAU-2 was 83 and 86%, respectively.

Graphical abstract

中文翻译：

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在厌氧条件下使用三价铁生物修复去除垃圾渗滤液中的磷酸盐

垃圾填埋场渗滤液中含有多种污染物，包括磷，鉴于富营养化的风险，应限制其进入地表水中。在这项研究中，我们调查了三价铁生物还原工艺从市政垃圾填埋场渗滤液中去除磷的效用。在Shewanella sp。存在下，在稀释的沥出液（1：5）中进行了厌氧生物还原实验。（10 ⁸ 细胞毫升^-1）。两种铁矿物质，赤铁矿（H）和绿脱石（NAU-2）也被用作Fe（III）来源。在孵育期间的0、2、5、10、15、20、25和30天进行系列采样。结果证实，Fe（III）的生物还原在两种铁矿物质的存在下发生，但在NAU-2的存在下更为广泛。在实验的第一天，磷酸盐以鸟粪石的形式化学沉淀，这与沥滤液中铵和镁的高初始浓度有关。随后，磷酸盐的去除被证明与生物Fe（II）的产生成正比，并为沉淀云母创造了条件。总体而言，在含有赤铁矿或NAU-2的悬浮液中，渗滤液中的磷酸盐去除率分别为83％和86％。

图形概要