Effect of heterotrophic nitrogen removal Pseudomonas stutzeri D3b strain and polyphosphate-accumulating Bacillus subtilis DTT.001 strain together with activated sludge (biomass of two strains) and biological fixed contact material (BFCM) for N and P removal in sewage water was carried out in a bioreactor 10-L with aerobic condition in 13 days. The results showed that pH of sewage water ranged from 8 to 9 during experiment time in all treatments
sewage water supplemented with glucose everyday reduced pH of sewage water (6.5) in 8 days after inoculation (DAI) however pH of sewage water increased over 8.0 when glucose stopping from 9 to 12 DAI. Application of activated sludge in sewage water enhanced ammonia removal performance (100 percent) at day 8th and orthophosphate (100 percent) at day 3th and the lowest released ammoniac gas (stripped ammonia). Sewage water supplemented with glucose everyday, a removal efficiency of 99.8 percent for ammonia (at 4 DAI) and 98.2 percent for orthophosphate (at 8 DAI) was attained. In BFCM treatment, both of activated sludge and supplemented glucose in sewage water treatments reduced total of kalium nitrogen (TKN), total of phosphorus (TP), total of suspensed solid (TSS) and chemical oxy demand (COD) of sewage water however TP, TSS and COD in sewage water effluent have not reached to standard of QCVN24 and 25:2009 /BTNMT. Hydraulic retention time (HRI) decreased from 270 h down 30 h.