N2O reduction during denitrifying phosphorus removal with propionate as carbon source

Evaluating the efficiency of carbon utilisation via bioenergetics between biological aerobic and denitrifying phosphorus removal systems

There are two biological systems available for removing phosphorus from waste water, conventional phosphorus removal (CPR) and denitrifying phosphorus removal (DPR) systems, and each is characterized by the type of sludge used in the process. In this study, we compared the characteristics associated with the efficiency of carbon utilization between CPR and DPR sludge using acetate as a carbon s...

Denitrifying and Phosphorus Removal Process and Its Affecting Factors

Effect of nitrite on nitrous oxide generation and emission during denitrifying phosphorus removal

Nitrous oxide (N2O) generation and emission may hamper the wide application of denitrifying phosphorus removal technology. In this study, batch experiments were carried out to investigate the effect of nitrite on N2O generation and emission during denitrifying phosphorus removal. Compared to NO3-N, N2O emission was much higher when NO2-N was used as the electron acceptor. N2O emission had no ob...

Influence of carbon source on nitrate removal of contaminated groundwater in a denitrifying submerged filter.

The effectiveness of three selected carbon sources (sucrose, ethanol and methanol) on submerged filters for the removal of nitrate from contaminated groundwater (100mg NO3(-)/litre), was studied. Process yields, nitrite accumulation, biomass production and growth of denitrifying bacteria were compared. Process yields, represented as ratio C/N were 2.5, 1.08 and 1.1 for sucrose, ethanol and meth...

Effects of ammonia on propionate degradation and microbial community in digesters using propionate as a sole carbon source

BACKGROUND: Propionate accumulation may lead to digester failure. This study aimed to investigate the effect of ammonia, a metabolic product of protein, on propionate degradation. The shift of microbial community was also investigated. RESULTS: Propionate accumulated over the experimental period in the reactor with a total ammonia nitrogen (TAN) concentration of 2.5 g N L -1 , as a result the d...