| Title |
Municipal Wastewater Reuse System Using Biofilter |
| Authors |
권중천 ( Joong Chun Kwon ) ; 문서연 ( Seo Yeon Moon ) ; 양창환 ( Chang Hwan Yang ) ; 최경민 ( Kyung Min Choi ) |
| Abstract |
In this study, a biofilter was applied to a municipal wastewater reuse system. It is an effective unit process in which the biological oxidation by the biofilm attached on the media and the filtration by the packed media happen simultaneously. First of all, the denitrification efficiency of this process was assessed according to the HRT, influent COD/N ratio, and media type. As a result, the effluent NO_3^--N concentration was less than 2 mg/L at the HRT 1∼3hr, and then denitrification efficiency ranged 74∼95 %. Without regard to the type of media used to pack biofilter, a maximum denitrification rate of about 164 g NO_3^--N/m^3-d was achieved with methanol, than the required COD/N ratio was close to 4.5 g COD/g NO_3^--N. And the biofilter was scaled up and operated for the treatment of the municipal wastewater passed through the biological advanced treatment. Under the filtration rate of 0.25∼0.5 m/hr, effluent SS concentration was less than 6 mg/L. If the filtration rate is increased, it have to increase that the media packed layer of the biofillter. |