IMPROVEMENT OF ANAEROBIC DIGESTION RATE
OF BIOSOLIDS IN WASTE ACTIVATED SLUDGE(WAS) BY ULTRASONIC PRETREATMENT

Oh, Sae Eun

doi:2006.11.3.143

Environmental Engineering Research 2006;11(3): 143-148. DOI: https://doi.org/10.4491/eer.2006.11.3.143

IMPROVEMENT OF ANAEROBIC DIGESTION RATE OF BIOSOLIDS IN WASTE ACTIVATED SLUDGE(WAS) BY ULTRASONIC PRETREATMENT

Division of Civil. Environmental & Urban Engineering, Hanbat National University, San 16-1, Dukmyung-dong, Yuseong-gu, Daejeon, Korea, 305-71

Corresponding Author: Sae Eun Oh ,Tel: +82-42-821-1263, Fax: +82-42-821-1476, Email: saeun@hanbat.ac.kr

Received: January 8, 2006; Accepted: March 10, 2006.

ABSTRACT

The ultrasonics is a new technology in waste activated sludge(WAS) treatment. Ultrasonic treatment is well known method for the break up of microbial cells to extract out a variety of intercellular materials inside microorganism cell. This study was done to investigate the effects of the ultrasonic frequency and power on disruption of biosolids in WAS and to examine the effect on methane production of WAS treated by ultrasonics. Biosolids disruption with ultrasound is more effective at ultrasonic frequency of 40 kHz and power of 0.3 watt/mL. In the digestion with WAS pretreated by sonication time for 10 minute at 40 kHz and 0.3 watt/mL, the total quantity of generated methane increased by 75%, as compared with experimental control(non-treatment).

Keywords: Waste activated sludge | Ultrasonic treatment | Anaerobic digestion | Sludge disruption | Biogas