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.
Unraveling Key Factors of Vivianite Formation: Affinity of Involved Bacteria on Acetic Acid
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第17期
Page:
1-6
Column:
Date of publication:
2022-09-01
- Keywords:
- vivianite; ferric/ferrous iron; dissimilated metal reducing bacteria (DMRB); methane-producing bacteria (MPB); acetic acid; affinity coefficient
- 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.
Last Update:
2022-09-01