[1]郝曉地,孫群,于文波,等.藍鐵礦形成要素探究：涉及細菌對乙酸的親和性[J].中國給水排水,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.
藍鐵礦形成要素探究：涉及細菌對乙酸的親和性
中國給水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第38卷 期數(shù): 2022年第17期 頁碼: 1-6 欄目: 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:
- 藍鐵礦是繼鳥糞石后又一種被關注的高含磷量磷酸鹽化合物。不同的是，藍鐵礦只能在污泥厭氧消化過程中形成，且需要污泥中含有足量的三價鐵（Fe3+）。有關藍鐵礦的研究目前又到了趨之若鶩的程度，但是藍鐵礦形成的關鍵制約因素仍未完全明晰。為此，通過序批式厭氧消化反應探究了厭氧消化系統(tǒng)中鐵還原細菌（DMRB）與產(chǎn)甲烷菌（MPB）對共同基質——乙酸的競爭關系，以確定藍鐵礦的形成是否會因MPB消耗乙酸而被影響（共性問題）。結果發(fā)現(xiàn)，兩種微生物對揮發(fā)性脂肪酸（VFAs）確實存在底物競爭關系，因DMRB對乙酸的親和系數(shù)比MPB低約1個數(shù)量級，使其在競爭中立于不敗之地。因此，MPB并存并不會明顯影響Fe3+還原速率及藍鐵礦形成。然而，藍鐵礦大量形成會減少甲烷（CH4）產(chǎn)量，平衡二者關系應為后續(xù)研究重點。
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
