Succession of bacterial community in anaerobic–anoxic–aerobic (A2O) bioreactor using sludge fermentation liquid as carbon source

Three different organic-phosphorus-mineralizing bacteria (OPMB) strains were inoculated to soil planted with soybean (Glycine max), and their effects on soybean growth and indigenous bacterial community diversity were investigated. Inoculation with Pseudomonas fluorescens Z4-1 and Brevibacillus agri L7-1 increased organic phosphorus degradation by 22% and 30%, respectively, compared with the control at the mature stage. Strains P. fluorescens Z4-1 and B. agri L7-1 significantly improved the soil alkaline phosphatase activity, average well color development, and the soybean root activity. Terminal restriction fragment length polymorphism analysis demonstrated that P. fluorescens Z4-1 and B. agri L7-1 could persist in the soil at relative abundances of 2.0%–6.4% throughout soybean growth. Thus, P. fluorescens Z4-1 and B. agri L7-1 could potentially be used in organic-phosphorus-mineralizing biofertilizers. OPMB inoculation altered the genetic structure of the soil bacterial communities but had no apparent influence on the carbon source utilization profiles of the soil bacterial communities. Principal components analysis showed that the changes in the carbon source utilization profiles of bacterial community depended mainly on the plant growth stages rather than inoculation with OPMB. The results help to understand the evolution of the soil bacterial community after OPMB inoculation.

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Characteristics of dissolved organic nitrogen in effluent from a biological nitrogen removal process using sludge alkaline fermentation liquid as an external carbon source

Water Research ◽

10.1016/j.watres.2020.115741 ◽

2020 ◽

Vol 176 ◽

pp. 115741 ◽

Cited By ~ 5

Author(s):

Haidong Hu ◽

Sijia Ma ◽

Xuxiang Zhang ◽

Hongqiang Ren

Keyword(s):

Carbon Source ◽

Nitrogen Removal ◽

Dissolved Organic Nitrogen ◽

Organic Nitrogen ◽

Biological Nitrogen Removal ◽

External Carbon Source ◽

Removal Process ◽

Fermentation Liquid ◽

Biological Nitrogen

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Efficient recovery of carbon, nitrogen, and phosphorus from waste activated sludge

Water Science & Technology ◽

10.2166/wst.2013.331 ◽

2013 ◽

Vol 68 (4) ◽

pp. 916-922 ◽

Cited By ~ 3

Author(s):

Yinguang Chen ◽

Xiong Zheng ◽

Leiyu Feng ◽

Hong Yang

Keyword(s):

Carbon Source ◽

Activated Sludge ◽

Precipitation Method ◽

Waste Activated Sludge ◽

Nitrogen And Phosphorus ◽

Nitrogen And Phosphorus Removal ◽

Fermentation Time ◽

Fermentation Liquid ◽

Efficient Recovery ◽

Biological Nitrogen

Carbon, nitrogen, and phosphorus need to be recovered to reduce the environmental impact of waste activated sludge (WAS). In this study the improved short-chain fatty acid (SCFA) production from WAS by the addition of kitchen waste to adjust the ratio of carbon to nitrogen (C/N), and the efficient recovery of nitrogen and phosphorus from the fermentation liquid were reported. Firstly, the optimum conditions for SCFA production were found to be pH 8, temperature 35 °C, C/N ratio 21 mg-C/1 mg-N, and fermentation time 6 d, using the response surface methodology. After alkaline fermentation, the struvite precipitation method was applied to efficiently and simultaneously recover the released ammonia and phosphorus from the fermentation liquid. Finally, the fermentation liquid was used as the additional carbon source for biological nitrogen and phosphorus removal. It was observed that, compared with acetic acid, the use of fermentation liquid as carbon source showed greater removal efficiencies of total nitrogen and total phosphorus.

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