Performance of an UASB reactor treating synthetic wastewater at low-temperature using cold-adapted seed slurry
Performance of an UASB reactor treating synthetic wastewater at low-temperature using cold-adapted seed slurry
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DOI：
10.1016/j.procbio.2006.09.010
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发表时间：
2007-03-01
影响因子：
4.4
通讯作者：
Chandra, T. S.
中科院分区：
文献类型：
--
作者：
Akila, G.;Chandra, T. S.
本研究是一种尝试，调查如果长期驯化的消化内容，以低温将改善废水处理在低温类似中温范围。在上流式厌氧污泥床反应器中，使用来自适应于15 ℃的牛粪消化器的接种物，研究了合成废水的低温（15 ℃）厌氧处理的可行性。通过将停留时间从7天减少到1天来研究改变水力停留时间的效果。在15 ℃的恒温条件下，水力停留时间为1天，相应的负荷率为7.2克-化学需氧量（COD）/升/天，达到90-95%的去除率。在标准温度压力（STP）下去除250 l/kg-COD的甲烷产量是该研究的一大亮点，补充了所实现的高处理效率。负荷率> 5克COD/升/天，伴随着增加流出的挥发性脂肪酸（VFA）浓度。由于在反应器的下部隔室中存在高浓度的活性颗粒污泥，在反应器的颗粒床内发生80%的COD降低。对低浓度废水的短期处理表明，去除率为70-75%，甲烷产率为300 l/kg-COD去除。具体的产甲烷活性曲线的厌氧生物质显示低温（15摄氏度）的最佳，表明在驯化过程中的冷活性微生物的选择。SMA测定还表明，一个puericolphilic嗜冷acetoclastic产甲烷群落的发展和沼气分析表明，75%的效率，在能源回收甲烷。(c)2006爱思唯尔有限公司保留所有权利。
The present study is an attempt to investigate if a long-term acclimation of digester contents to low-temperatures would improve wastewater treatment at low-temperatures similar to mesophilic ranges. The feasibility of low-temperature (15 degrees C) anaerobic treatment of synthetic wastewater in an upflow anaerobic sludge blanket reactor was studied using inoculum from a cattle manure digester adapted to 15 degrees C. The effect of varying hydraulic retention time was studied by decreasing the retention time from 7 days to 1 day. Under a constant temperature of 15 degrees C with a hydraulic retention time of I day and a corresponding loading rate of 7.2 g-chemical oxygen demand (COD)/l/day, 90-95% removal efficiency was achieved. The methane production of 250 l/kg-COD removed at standard temperature pressure (STP) is a major highlight of the study complementing the high treatment efficiency achieved. Loading rates > 5 g-COD/l/day was accompanied by increase in effluent volatile fatty acids (VFA) concentrations. Due to the presence of a high concentration of active granular sludge in the lower compartment of the reactor, 80% reduction of COD occurred within the granular bed of the reactor. Treatment of low strength wastewater for a short period showed 70-75% removal efficiencies with methane yield of 300 l/kg-COD removed. Specific methanogenic activity profiles of the anaerobic biomass revealed low-temperature (15 degrees C) optima, indicating selection of cold-active microorganisms during the acclimation process. The SMA assays also indicate the development of a putatively psychrophilic acetoclastic methanogenic community and biogas analysis showed 75% efficiency in energy recovery as methane. (c) 2006 Elsevier Ltd. All rights reserved.