Effects of high calcium concentrations on the development of methanogenic sludge in upflow anaerobic sludge bed (UASB) reactors
Effects of high calcium concentrations on the development of methanogenic sludge in upflow anaerobic sludge bed (UASB) reactors
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DOI：
10.1016/s0043-1354(97)00335-7
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发表时间：
1998-04
期刊：
影响因子：
12.8
通讯作者：
E. Langerak;G. Gonzalez-Gil;A. V. Aelst;J. B. Lier;H. Hamelers;G. Lettinga
中科院分区：
文献类型：
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作者：
E. Langerak;G. Gonzalez-Gil;A. V. Aelst;J. B. Lier;H. Hamelers;G. Lettinga
研究了高钙含量（600- 1200 mgCa 2 +.l-1）废水厌氧处理的可行性。研究了沉淀量和生物量差异对厌氧污泥生长的影响。实验在实验室规模的升流式厌氧污泥床（UASB）反应器中进行，接种粉碎的颗粒污泥。四个反应器在14gCOD.l-1.d-1的恒定有机负荷下运行180天，处理进水中不同钙浓度的完全和部分酸化废水。处理钙浓度为1200 mgCa 2 +.l-1的完全酸化的废水导致不稳定的COD去除率（60-90%）。此外，污泥床在运行180天后发生胶结，导致运行问题。当废水完全酸化且进水钙浓度较低（600 mgCa 2 +.l-1）时，钙沉淀较少，COD去除率始终超过98%。培养的污泥具有较高的灰分含量，80- 90%，产甲烷活性大致保持在0.7gCOD.gVSS-1.d-1。然而，在后一种条件下，反应器隔室发生结垢。一部分非酸化底物（即葡萄糖）的存在降低了胶结的风险，导致产甲烷污泥更好的颗粒化，似乎可以防止反应器隔室结垢。相当数量的磷酸盐被证明是从进水中去除，最有可能通过共沉淀，并纳入厌氧污泥。结果表明，部分酸化的基质比完全酸化的基质在UASB反应器中厌氧处理高钙废水更可行。
The feasibility of anaerobic treatment of wastewaters with a high calcium content (600–1200mgCa2+.l−1) was studied. The influence of the amount of precipitation and the influence of differences in biomass yield were investigated on the development of anaerobic sludge. The experiments were performed in lab scale Upflow Anaerobic Sludge Blanket (UASB) reactors, inoculated with crushed granular sludge. Four reactors were operated during 180days at a constant organic loading rate of 14gCOD.l−1.d−1, treating completely and partly acidified wastewater with different calcium concentrations in the influent. Treatment of completely acidified wastewater with a calcium concentration of 1200mgCa2+.l−1resulted in an unstable COD removal efficiency (60–90%). Furthermore, cementation of the sludge bed occurred after 180days of operation, leading to operational problems. With completely acidified wastewater and a lower calcium concentration in the influent (600mgCa2+.l−1), less calcium precipitated and COD removal efficiency always exceeded 98%. The cultivated sludge had a high ash content, 80–90%, and methanogenic activity remained more or less constant at 0.7gCOD.gVSS−1.d−1. However, scaling of reactor compartments occurred under the latter condition. The presence of a fraction of non-acidified substrate, i.e. glucose, decreased the risk of cementation, resulted in better granulation of the methanogenic sludge and seemed to prevent scaling of reactor compartments. Considerable amounts of phosphate were shown to be removed from the influent, most probably by coprecipitation, and incorporated in the anaerobic sludge. The results indicate that anaerobic treatment of high calcium wastewaters in UASB reactors is more feasible for partly than for completely acidified substrates.