[1]郝晓地,孙群,于文波,等.蓝铁矿形成要素探究：涉及细菌对乙酸的亲和性[J].中国给水排水,2022,38(17):1-6.
HAOXiao-di,SUNQun,YUWen-bo,et al.Unraveling Key Factors of Vivianite Formation: Affinity of Involved Bacteria on Acetic Acid[J].China Water & Wastewater,2022,38(17):1-6.
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HAOXiao-di,SUNQun,YUWen-bo,et al.Unraveling Key Factors of Vivianite Formation: Affinity of Involved Bacteria on Acetic Acid[J].China Water & Wastewater,2022,38(17):1-6.
蓝铁矿形成要素探究：涉及细菌对乙酸的亲和性
中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第38卷 期数: 2022年第17期 页码: 1-6 栏目: 出版日期: 2022-09-01
- Title:
- Unraveling Key Factors of Vivianite Formation: Affinity of Involved Bacteria on Acetic Acid
- Keywords:
- vivianite; ferric/ferrous iron; dissimilated metal reducing bacteria (DMRB); methane-producing bacteria (MPB); acetic acid; affinity coefficient
- 摘要:
- 蓝铁矿是继鸟粪石后又一种被关注的高含磷量磷酸盐化合物。不同的是，蓝铁矿只能在污泥厌氧消化过程中形成，且需要污泥中含有足量的三价铁（Fe3+）。有关蓝铁矿的研究目前又到了趋之若鹜的程度，但是蓝铁矿形成的关键制约因素仍未完全明晰。为此，通过序批式厌氧消化反应探究了厌氧消化系统中铁还原细菌（DMRB）与产甲烷菌（MPB）对共同基质——乙酸的竞争关系，以确定蓝铁矿的形成是否会因MPB消耗乙酸而被影响（共性问题）。结果发现，两种微生物对挥发性脂肪酸（VFAs）确实存在底物竞争关系，因DMRB对乙酸的亲和系数比MPB低约1个数量级，使其在竞争中立于不败之地。因此，MPB并存并不会明显影响Fe3+还原速率及蓝铁矿形成。然而，蓝铁矿大量形成会减少甲烷（CH4）产量，平衡二者关系应为后续研究重点。
Abstract:- Vivianite is a concerned phosphate compound with a high P-content, following struvite. Differently, vivianite can only be formed during anaerobic digestion of excess sludge, in which enough ferric iron (Fe3+) in sludge is required. Present researches on vivianite are being pursued, but key factors controlling vivianite formation are still not fully understood. Thus, the competition between dissimilated metal reducing bacteria (DMRB) and methane-producing bacteria (MPB) for acetate was mainly investigated to unravel whether vivianite formation was controlled by consuming acetic acid by MPB (a generic question). Experimental results indicated that there was indeed the competition between DMRB and MPB for acetic acid. But the affinity coefficient of DMRB on acetic acid was about one order of magnitude lower than that of MPB, which made DMRB become an unrivaled competitor. As a result, coexistence of MPB did not significantly affect the reduction rate of Fe3+ for vivianite formation. However, a large amount of vivianite formation could reduce methane (CH4)production, and thus the balance between the two bacteria should be a focus in subsequent researches.
更新日期/Last Update: 2022-09-01
