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The effect of calcium on the treatment of fresh leachate in an expanded granular sludge bed bioreactor |
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| Authors: | Liu Jianyong Hu Jun Zhong Jiangping Luo Jinghuan Zhao Aihua Liu Feng Hong Ruijing Qian Guangren Xu Zhi Ping |
| Institution: | a Department of Environmental Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, PR China b Shanghai Engineering Research Center of Municipal Solid Waste Treatment and Recycle, No. 345 Shilong Road, Shanghai 200232, PR China c ARC Centre of Excellence for Functional Nanomaterials, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane QLD 4072, Australia |
| Abstract: | 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/m3 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 CH4 production rate was complex, first positive during the start-up but later on negative. |
| Keywords: | Fresh leachate EGSB bioreactor Granule settling Calcium accumulation Specific methanogenic activity |
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