Denitrification of drinking water using a hybrid heterotrophic/autotrophic/BAC bioreactor

作者：Saeedi Reza; Naddafi Kazem^*; Nabizadeh Ramin; Mesdaghinia Alireza; Nasseri Simin; Alimohammadi Mahmood; Nazmara Shahrokh

来源：Desalination and Water Treatment, 2012, 45(1-3): 1-10.

DOI：10.5004/dwt.2012.3147

• Heterotrophic denitrification
• Autotrophic denitrification
• BAC
• Drinking water NO3- loading rate
• C:N ratio

The performance of a hybrid heterotrophic/autotrophic/BAC bioreactor (HHABB) for denitrification of drinking water was studied in continuous mode for several months to determine the optimal conditions. The HHABB was consisted of three compartments: ethanol heterotrophic part (EH-part), sulfur autotrophic part (SA-part) and BAC-part (including anoxic and aerobic sections). The experiments were conducted at six runs with NO3- loading rates ranged from 0.36 to 1.45 kgN m(-3) d(-1), C:N ratios 0.53 and 0.70 and approximately constant NO3- concentration of 30 mgN l(-1). At lower NO3- loading rates (0.36 and 0.72 kgN m(-3) d(-1)), the C:N ratio 0.53 provided high denitrification efficiencies (96-99%) with very low effluent DOC and trihalomethane formation potential (THMFP) concentrations of 0.33-0.50 mgC l(-1) and 26-41 mu g l(-1), respectively. In contrast, at NO3- loading rate 1.07 kgN m(-3) d(-1), an increase in C:N ratio to 0.70 was required to achieve suitable results. The aerobic BAC-part showed suitable efficiency in the oxidation of NO2- and removal of DOC and THMFP. This study predicted that the HHABB without the anoxic BAC-part could be as a feasible alternative for NO3- removal from drinking water at full-scale.

• 出版日期2012-7