Department of Environmental Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, PR China.
Bioresour Technol. 2011 May;102(9):5466-72. doi: 10.1016/j.biortech.2010.11.056. Epub 2010 Nov 19.
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 40 days for the treatment of calcium-containing fresh leachate with chemical oxygen demand (COD) removal efficiency above 90% and organic loading rate up to 72.84 kg COD/m(3) day. 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 CH(4) production rate was complex, first positive during the start-up but later on negative.
本研究考察了在中温条件下，膨胀颗粒污泥床（EGSB）生物反应器中钙对新鲜渗滤液厌氧处理的影响。实验观察到，采用厌氧颗粒污泥接种的生物反应器，仅需约 40 天即可启动，对含有化学需氧量（COD）去除率高于 90%和有机负荷率高达 72.84kg COD/m3·d 的含钙新鲜渗滤液进行处理。颗粒上的钙积累与钙浓度单调相关，以碳酸钙、磷酸盐/膦酸盐和羧酸盐的形式占悬浮固体中钙的 17-18wt.%。矿物形成显著提高了颗粒的沉降速度（提高约 50%）和悬浮固体浓度（提高约 100%）。然而，钙沉淀对甲烷特定活性和 CH4 产生速率的影响是复杂的，在启动阶段最初是积极的，但后来是消极的。
