The effect of landfill leachate composition on organics and nitrogen removal in an activated sludge system with bentonite additive.
The effect of landfill leachate composition on organics and nitrogen removal in an activated sludge system with bentonite additive.
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DOI：
10.1016/j.jenvman.2006.08.001
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发表时间：
2007-10
影响因子：
8.7
通讯作者：
J. Wiszniowski;J. Surmacz-Górska;D. Robert;J. Weber
中科院分区：
文献类型：
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作者：
J. Wiszniowski;J. Surmacz-Górska;D. Robert;J. Weber
采用无内循环的前置反硝化活性污泥系统（AS）对垃圾渗滤液进行了实验室处理研究。膨润土补充剂的比例为1：4（矿物质：生物质），以确保高污泥沉降水平，并作为微生物载体。该系统在不同的参数下运行，如水力停留时间（HRT），氨负荷率（ALR）或外部循环比，这是适应于处理不同的渗滤液浓度的COD和氨，范围分别为1020至2680 mgO 2 l-1和400- 890 mgNH 4-Nl-1。硝化反应完全，氨氧化率达到99%;这是在ALR不超过0.09g NH 4 +-Ng− 1 MLVSS d− 1和HRT不低于1天（在曝气反应器中）时获得的。当原水渗滤液BOD 5/N为4.1时，通过控制外循环速率，成功地提高了反硝化效果。因此，实现了高达80%的N去除。在BOD 5/N比为0.5时，反硝化速率降低了10倍。COD去除率在36%~ 84%之间变化较大。确定了膨润土添加的积极作用，并根据初步研究进行了讨论。实验在填吸式活性污泥中进行，膨润土的生物量比为1：2。用合成的高氨和无有机物的培养基进料具有膨润土的活性污泥。
A pre-denitrification activated sludge system (AS) without internal recycle was used in lab-scale studies of landfill leachate treatment. A bentonite supplement at a ratio of 1:4 (mineral : biomass) was used to ensure high sludge settling levels and to serve as a micro-organisms carrier. The system was operated within different parameters such as hydraulic retention time (HRT), ammonia loading rate (ALR) or external recycle ratio, which was adapted to treat varying leachate concentrations of COD and ammonia, ranging from 1020 to 2680mgO2l−1and 400–890mgNH4-Nl−1respectively. The nitrification was complete and ammonia oxidation reached 99%; this was obtained while the ALR did not exceed 0.09g NH4+-Ng−1MLVSS d−1and HRT was not lower than 1 day (in the aeration reactor). The performance of denitrification was successfully improved by controlling the external recycle rate, when the BOD5/N ratio in the raw leachate was 4.1. Consequently, N-removal of up to 80% was achieved. A 10-fold decrease in the denitrification rate was obtained at a BOD5/N ratio of 0.5. The efficiency of COD removal varied significantly from 36% to 84%. The positive effect of bentonite addition was determined and is discussed based on preliminary studies. The experiments were carried out in fill-and-draw activated sludge with bentonite; the biomass ratio was 1:2. The activated sludge with bentonite was fed with a synthetic high ammonia and organic-free medium.