Resource recovery and nitrogen removal from piggery waste using the combined anaerobic processes

The combined ADEPT (Anaerobic Digestion Elutriated Phased Treatment)- SHARON (Single reactor system High Ammonium Removal Over Nitrite) – ANAMMOX (Anaerobic Ammonium Oxidation) processes were operated for the purpose of resource recovery and nitrogen removal from slurry-type piggery waste. The ADEPT operated at acidogenic loading rates of 3.95 gSCOD/L-day, the SCOD elutriation rate and acid production rate were 5.3 gSCOD/L-day and 3.3 gVFAs(as COD)/L-day, respectively. VS reduction and SCOD reduction by hydrolysis were 13% and 0.19 gSCOD_prod./gVS_feeding, respectively. Also, the acid production rate was 0.80 gVFAs/gSCOD_production. In the methanogenic reactor, the gas production rate and methane content were 2.8 L/day (0.3 m³CH₄/kgCOD_removal@STP) and 77%, respectively. With these operating condition, the removal of nitrogen and phosphorus were 94.1% as NH₄-N (86.5% as TKN) and 87.3% as T-P, respectively.