| Title |
Evaluation of Low-temperature Thermal Pre-treatment and Biogas Characteristics using Waste Activated Sludge |
| Authors |
최재훈 ( Jae-hoon Choi ) ; 정성엽 ( Seong-yeob Jeong ) ; 김지태 ( Ji-tae Kim ) |
| DOI |
https://doi.org/10.15681/KSWE.2019.35.4.299 |
| Keywords |
BMP test; Solubilization; Thermal pre-treatment; Waste Activated Sludge |
| Abstract |
The purpose of this study was to investigate the effect of low temperature thermal pre-treatment on biodegradation of waste activated sludge for anaerobic digestion as a countermeasure for increasing sludge generation. The experimental condition was accomplished in 2 %, 4 %, and 6 % TS concentration, and 70 ℃, 80 ℃, 90 ℃ of temperature for a maximum of 120 minutesretention time. Then, it was followed by analysis of physical/chemical properties, BMP test and composition of biogas. The biogas characteristic was evaluated by applying the modified Gomperz model. As a result, solubility of dissolved substrate, such as SCODCr, soluble carbohydrate, and soluble protein, and biogas production increased as temperature increased.Solubilization efficiency at 90 ℃ was 18.4 %, 17.03 % and 16.88% in 2 %, 4 %, and 6 % TS concentration respectively. Also, solubilization rates of carbohydrate and protein similarly increased. BMP test results also showed that methane production in excess sludgeincreased to 0.194, 0.187 and 0.182 m3/kg VS. respectively, and lag phase decreased to 0.145, 0.220, 0.351 day due to acceleration of the hydrolysis step. Consequently, low-temperature thermal pre-treatment could increase biodegradability of sludge, positively affecting biogas production and sludge reduction. |