| Title |
Evaluation of Physical Shear Pre-treatment and Biogas Characteristics using Mixed Sludge |
| Authors |
최재훈 ( Jae-hoon Choi ) ; 정성엽 ( Seong-yeob Jeong ) ; 김지태 ( Ji-tae Kim ) |
| DOI |
https://doi.org/10.15681/KSWE.2019.35.4.362 |
| Keywords |
BMP test; Mixed Sludge; Shear Pre-treatment; Solubilization |
| Abstract |
In this study, biodegradation efficiency improvement of mixed sludge for the anaerobic digestion process in wastewater treatment plant was investigated. In order to release the organic material contained in the sludge cell and promote the hydrolysis step, mixed sludge of 7% TS (Total Solids) was physically shear-treated at a shear strength of 1,000 ~ 4,000 rpm and a maximum of 120 mins. As a result of the comparison between mixed sludge before and after the treatment, the concentration of SCODCr(Soluble Chemical Oxygen Demand-chromium method) was increased through the conversion of granular organic matter into dissolved organic matter as shear strength and treatment time increases. The solubilization efficiencyincreased rapidly after 30 min of solubilization application time, and they were 11.23 %, 20.10 %, 22.52 % and 25.43% at 120 min for each shear strength conditions, respectively. Additionally, the BMP(Biochemical Methane Potential) test was conducted with the optimized samples to determine the increase of methane production by the shear pre-treatment. Consequently, methane production of each samples were 0.275, 0.310, 0.323 and 0.335 m3/kg VSadd, which indicates that methane production was increased to a maximum of 21.28 % compared to the control without the solubilization process (0.262 m3/kg VSadd). As a result, the physical shear-treatment is a promising process for sewage sludge pre-treatment to reduce the organic waste and increase the energy production. |