Enhancing denitrification phosphorus removal with a novel nutrient removal process: Role of configuration

Role of influent split ratio in a two-line BNR process performing denitrifying phosphorus removal

“…Some researchers reported that nitrate and carbon resources were two essential factors in denitrifying phosphorus removal by acting as electron acceptor and donor respectively [15,16]; while the external and/ or internal sludge reflux ratios were found to be two parameters affecting operating cost and performances [17]. Other operational parameters such as pH, dissolved oxygen (DO) in different compartments, hydraulic retention time (HRT) and sludge retention time (SRT) were also reported to affect denitrifying phosphorus removal [18][19][20].…”

“…In our previous works, we developed a DPB-enrich configuration characterized by dividing a big rectangular bioreactor into six identical compartments, the two-line AN/AO process; it is flexible in operational modes by installing plate valves between the shared walls and could be operated as some major BNR processes such as A 2 /O, UCT and BCFS [10,17]. The two-line operational mode was proved to be an efficient approach that enriching DPB in the configuration [10]; it could avoid the interference between common PAOs and DPBs: the AO line was operated with the anaerobic-aerobic-aerobic mode while the AN line was operated with the anaerobic-anoxic-anoxic mode (Fig.…”

Organic substrate transformation and sludge characteristics in the integrated anaerobic anoxic oxic–biological contact oxidation (A2/O–BCO) system treating wastewater with low carbon/nitrogen ratio

“…In the anaerobic stage, both DNPAOs and PAOs took up volatile fatty acids (VFAs) to synthesize poly-β-polyhydroxyalkanoates (PHA) and stored it internally [10]. DNPAOs consumed the energy from glycogen glycolysis and polyphosphate hydrolysis, and resulted in the release of DNPAOs have a unique advantage over conventional EBPR of PAOs: the capability of utilizing the limited carbon sources for simultaneous nitrogen and phosphorus removal, especially treating municipal wastewater with low carbon/nitrogen (COD/N) ratio [11,12]. However, glycogen accumulating organisms (GAOs) [13,14] and denitrifying GAOs (DNGAOs) [15] competed with DNPAOs for carbon sources without phosphorus release and uptake, and deteriorated phosphorous removal efficiency [16,17].…”

Study on Influence of Nitrate on Induction of Denitrifying Phosphate Accumulating Organisms

“…It is well known that excessive phosphorus and nitrogen discharged from domestic and industrial wastewater bring about eutrophication [1].which impairs the quality of the water, which is not satisfied for drinking water source, irrigation, industrial, and so on [2].Nitrogen and phosphorus must be removed from wastewater to meet stringent standards. So far biological nutrient removal (BNR) is a frequently used and environmentally sustainable method.…”