The roles of calcium in sludge granulation during UASB reactor start-up.
The roles of calcium in sludge granulation during UASB reactor start-up.
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DOI：
10.1016/s0043-1354(00)00345-6
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发表时间：
2001-03
期刊：
影响因子：
12.8
通讯作者：
H. Yu;J. Tay;H. H. Fang-H.
中科院分区：
文献类型：
--
作者：
H. Yu;J. Tay;H. H. Fang-H.
6个上流式厌氧污泥膜反应器（UASB）同时运行146d，考察启动时钙对污泥造粒过程的影响。150 ~ 300mg/l浓度Ca2+的引入促进了生物质积累和造粒过程。颗粒中钙的浓度与饲料中钙的浓度几乎成正比，碳酸钙是颗粒中钙的主要沉淀物。颗粒的比活性随着进水钙浓度的增加而降低。造粒的最佳钙浓度为150 ~ 300mg/l。在UASB反应器中添加低浓度钙可以提高污泥造粒的三个步骤：吸附、粘附和增殖，但没有导致颗粒中优势微生物的增殖不同。
Six upflow anaerobic sludge blanket (UASB) reactors were concurrently operated for 146d to examine the effects of calcium on the sludge granulation process during start-up. Introduction of Ca2+at concentrations from 150 to 300mg/l enhanced the biomass accumulation and granulation process. The calcium concentration in the granules was nearly proportional to the calcium concentration in the feed, and calcium carbonate was the main calcium precipitate in the granules. The specific activity of granules decreased with increasing influent calcium concentration. The optimum calcium concentration for the granulation was from 150 to 300mg/l. The addition of low-concentration calcium to the UASB reactors appeared to enhance the three steps of sludge granulation: adsorption, adhesion and multiplication, but it did not lead to a different proliferation of predominant microorganisms in the granules.