| Title |
Determination of BDOCrapid and BDOCslow using Batch Bio-reactor |
| Authors |
손희종 ( Hee Jong Son ) ; 노재순 ( Jae Soon Roh ) ; 강임석 ( Lim Seok Kang ) |
| Keywords |
Biofiltration; BDOC fraction; BDOCrapid; BDOCslow; Optimal incubation time |
| Abstract |
In this study, biodegradable organic matter was divided into a rapidly biodegradable fraction(BDOC_(rapid)) and a slowly biodegradable fraction(BDOC_(slow)) for various waters with different types of DOC. These fractions(BDOC_(rapid) and BDOC_(siow)) were defined by using a shaking incubation method modified from Carlson`s method. Also, in this study, optimum incubation time and accuracy were investigated to determine BDOC_(rapid) and BDOC_(slow). When suspended bacteria obtained from raw water and BAC effluent, or attached bacteria from BAC was respectively used as an inoculum, the difference in total BDOC(BDOC_(total)) was minimal. Therefore, total BDOC was determined in 7~8 days by the shaking method, which is comparable with Servais`s method by which BDOC was determined in 28 days. In addition, the difference of BDOC between these two methods was within 7%. Although BDOC_(rapid) and BDOC_(slow) were effectively determined by a method defined by Klevens, the difference in optimal incubation time was significant for different water samples. However, when using the shaking method, optimal incubation time for BDOC_(rapid) was found to be 3 days, therefore, the BDOC_(rapid) was defined as the difference between DOC_0 and DOC_(3days), and BDOC_(slow) was defined as the difference between BDOC_(total) and BDOC_(rapid). As a conclusion, for determining the fraction of BDOC using the shaking method, the concentrations of an inoculums and optimal incubation times used in this study were very effective. |