Comparison of UASB and EGSB performance on the anaerobic biodegradation of 2,4-dichlorophenol.
Comparison of UASB and EGSB performance on the anaerobic biodegradation of 2,4-dichlorophenol.
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DOI：
10.1016/j.chemosphere.2009.06.015
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发表时间：
2009-08
期刊：
影响因子：
8.8
通讯作者：
D. Puyol;Á. F. Mohedano;J. Sanz;J. J. Rodriguez-J.
中科院分区：
文献类型：
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作者：
D. Puyol;Á. F. Mohedano;J. Sanz;J. J. Rodriguez-J.
以葡萄糖为主要碳源，研究了升流式厌氧污泥床（UASB）和膨胀颗粒污泥床（EGSB）反应器中2，4-二氯苯酚（2，4-DCP）的厌氧降解。从2，4-DCP和COD去除率、产甲烷量、稳定性、颗粒污泥适应性以及细菌抑制的逆转等方面比较了两种系统的性能。有机物和2，4-DCP的加载速率在整个实验中逐渐变化。当负荷为1.9gCODL-1d-1和100 mg 2，4-DCP L-1d-1时，UASB和EGSB反应器对2，4-DCP的去除率分别为75%和84%，COD消耗率分别为61%和80%。在这些条件下，EGSB反应器中的甲烷产量达到0.088L CH 4g −1COD，而UASB反应器中的甲烷产量几乎可以忽略不计。将2，4-DCP的负荷率降低到30 mgL −1d− 1，在两个反应器中都观察到甲烷产量的改善（UASB和EGSB反应器中的产甲烷活性分别为0.148和0.192 L CH 4g −1COD）。脱氯效率提高，在两个反应器中从约30%至80%，减少一半的COD由于减少的4-氯苯酚浓度积累在两个反应器的流出物。当2，4-DCP的进料浓度超过210 mgL − 1时，由于2，4-DCP在出水中的积累，UASB反应器的脱氯效率受到显著抑制。SEM研究表明，污泥颗粒没有显着的形态变化。
The anaerobic degradation of 2,4-dichlorophenol (2,4-DCP) in upflow anaerobic sludge blanket (UASB) and expanded granular sludge bed (EGSB) reactors using glucose as main carbon source was studied. The performance of both systems was compared in terms of 2,4-DCP and COD removal efficiencies, methane production, stability, granular sludge adaptability as well as reversion of the bacterial inhibition. Both organic and 2,4-DCP loading rates were incrementally varied through the experiments. With loading rates of 1.9gCODL−1d−1and 100mg 2,4-DCP L−1d−1, 75% and 84% removal efficiencies of this compound, accompanied by COD consumption efficiencies of 61% and 80% were achieved in the UASB and EGSB reactors, respectively. In these conditions, methane production reached 0.088L CH4g−1COD in the EGSB reactor whereas in the UASB reactor was almost negligible. Decreasing the 2,4-DCP loading rate to 30mgL−1d−1an improvement in the methane production was observed in both reactors (methanogenic activity of 0.148 and 0.192L CH4g−1COD in UASB and EGSB reactors, respectively). Efficiency of dechlorination was improved in both reactors from around 30% to 80% by reducing to one-half the COD due to a decreasing of the 4-chlorophenol concentration accumulated in the effluents of both reactors. The dechlorination efficiency of the UASB reactor was dramatically inhibited at a 2,4-DCP feed concentration above around 210mgL−1because of 2,4-DCP accumulation in the effluent. SEM studies revealed no significant morphological changes in the sludge granules.