The effect of calcium on the treatment of fresh leachate in an expanded granular sludge bed bioreactor.
The effect of calcium on the treatment of fresh leachate in an expanded granular sludge bed bioreactor.
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DOI：
10.1016/j.biortech.2010.11.056
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发表时间：
2011-05
影响因子：
11.4
通讯作者：
Jianyong Liu;Jun Hu;Jiangping Zhong;Jinghuan Luo;A. Zhao;Feng Liu;R. Hong;G. Qian;Z. Xu
中科院分区：
文献类型：
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作者：
Jianyong Liu;Jun Hu;Jiangping Zhong;Jinghuan Luo;A. Zhao;Feng Liu;R. Hong;G. Qian;Z. Xu
在中温条件下，在膨胀颗粒污泥床(EGSB)生物反应器中考察了钙对新鲜渗滤液厌氧处理的影响。试验结果表明，接种厌氧颗粒污泥的生物反应器处理含钙新鲜渗滤液仅需40d左右即可启动，化学需氧量(COD)的去除效率可达90%以上，有机负荷可达72.84 kg/m~3·d。钙在颗粒上的积累量与钙浓度呈单调关系，占悬浮固体中以碳酸钙、磷酸盐/磷酸盐和羧酸盐形式存在的钙的17-18wt.%。矿物形成显著提高了颗粒沉降速度(∼50%)和悬浮物浓度(∼100%)。然而，钙沉淀对比产甲烷活性和产甲烷速率的影响是复杂的，在启动过程中先是正的，然后是负的。
This research investigated the calcium effect on the anaerobic treatment of fresh leachate in an expanded granular sludge bed (EGSB) bioreactor under mesophilic conditions. The observations show that the bioreactor, inoculated with anaerobic granular sludge, can be started up only in about 40days for the treatment of calcium-containing fresh leachate with chemical oxygen demand (COD) removal efficiency above 90% and organic loading rate up to 72.84kg COD/m3day. The calcium accumulation onto the granules was monotonically related to the calcium concentration, accounting for 17–18 wt.% of Ca in the suspended solid in the form of calcium carbonate, phosphates/phosphonates and carboxylates. The mineral formation significantly increased the granule settling velocity (by ∼50%) and the suspended solid concentration (by ∼100%). However, the effect of calcium precipitation on the specific methanogenic activity and the CH4production rate was complex, first positive during the start-up but later on negative.