Abstract
Phosphorus is one of the main factors causing water eutrophication, and the traditional phosphorus removal process causes phosphorus-rich sludge pollution. The facultative MBR process uses phosphate-reducing bacteria to convert phosphate into directly recyclable gaseous phosphine to solve this malpractice and make sewage become a new phosphorus resource. In order to investigate the phosphorus removal efficiency and the mechanism under facultative conditions, run the facultative MBR reactor for 30 days. The COD value, phosphate concentration, and phosphine yield were measured, and the changes of sludge metabolic pathway abundance and community composition in different periods were detected. According to the measurement, the maximum phosphorus removal efficiency is 43.11% and the maximum yield of phosphine is 320 μg/m3 (measured by the volume of sewage). Combined with thermodynamic analysis, the microbial mechanism of the reactor was proposed, and the possible transformation pathway of phosphorus was analyzed. At last, changes the phosphorus removal process from the ‘removal type’ to the ‘recycling type’.
Highlights
Phosphorus is a kind of non-renewable and non-metallic mineral resource
It is generally accepted that phosphine in the ecosystem is produced by the reduction reaction of microorganisms [1,6,7], in which the phosphate-reducing bacteria use the energy and reducing forces produced by carbon source degradation to reduce the phosphate [8,9]
The mechanism of phosphine production by phosphate-reducing bacteria was analyzed from the point of view of carbon source degradation
Summary
Phosphorus is a kind of non-renewable and non-metallic mineral resource. there still exist widespread global contradictions between the reduction of phosphorus mineral resources and water eutrophication caused by too high phosphorus contents. Traditional biological phosphorus removal methods mainly focus on discharging the phosphorus-rich sludge. It is generally accepted that phosphine in the ecosystem is produced by the reduction reaction of microorganisms [1,6,7], in which the phosphate-reducing bacteria use the energy and reducing forces produced by carbon source degradation to reduce the phosphate [8,9]. On this basis, the mechanism of phosphine production by phosphate-reducing bacteria was analyzed from the point of view of carbon source degradation. In order to find the metabolic pathway and microbial population related to the production process of phosphine, the biological metabolic pathway and microbial population structure of phosphorus in the system were studied
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