| Title |
Assessment of Anaerobic Pretreatment of Swine Wastewater Using Anaerobic Filter for the Subsequent Nitrogen and Phosphorous Removal |
| Authors |
강호(Ho Kang),신경숙(Kyung Sook Shin),문서연(Seo Yeon Moon) |
| Abstract |
This study was performed to optimize the anaerobic pretreatment of swine wastewater for the subsequent nitrogen and phosphorous removal. Step-wise decrease in hydraulic retention time(HRT) and increase in organic loading rate(OLR) were utilized in anaerobic filter reactor at mesophilic temperature(35℃). Total chemical oxygen demand(TCOD) removal efficiency of 36-45% at HRTs of 1-2days was observed with the OLR range of 6-12g TCOD/L-d. The suspended solids removal showed 30-39% at HRTs of 1-2days. The methane production rate appeared to be 1.45v/v-d at an HRT of 1 day and the methane content showed unusually high(ranged 71-82%) during the entire operational periods. The reactor alkalinity concentration over 2,000㎎/L as CaCO₃ during the operation could play an important role for compensating pH drop caused by nitrification. The COD/TKN ratio of 11-23, COD/TP ratio of 30-50 and higher buffering capacity of the effluent from the anaerobic filter could be adequate substrate condition for the subsequent biological nitrogen and phosphorous removal. |