Title:
Effect of Ultrasonic Pre-Treatment on Anaerobic Digestability and Sludge Characteristics of Two Different Effluents
Author(s):
Koch, K., Bandeline, J.
Document(s):
Paper
Abstract:
The effects of an ultrasonic pre-treatment of the effluents from a municipal wastewater treatment plant (WWTP) and an agricultural biogas plant (ABP) were analyzed. By comparing the resulting methane productions of the treated samples to the untreated ones, a maximum temporarily acceleration of 80% was measured for the WWTP effluent with a pre-treatment duration of 30 minutes. For ABP effluent, the 0.5 minutes pre-treatment gained the maximum temporarily plus of 30 %. In both cases, the maximum was reached after about 4 days of incubation and this advance was partly compensated by the untreated sample until the end of the experiment. Furthermore it was shown that the soluble COD is a reliable parameter to estimate the methane potential and hence, the performance of the pre-treatment method. Examination of the change in viscosity due to the treatment indicated no significant influence on the rheological properties. When focusing on the remaining methane potential of the concerning effluents, between 40 % (WWTP effluent) and 45 % (ABP effluent) of the already tapped potential can additionally be hauled out during another 18 days of retention time. Due to the stimulating effect of the ultrasound on the degradation process, pre-treatment could help to intensify the methane productivity at given retention time.
Keywords:
biogas, efficiency, sewage sludge, pretreatment, hydrolysis, agricultural biogas plant
Topic:
R&D on Biomass Conversion Technologies for Heating, Electricity and Chemicals
Subtopic:
Anaerobic digestion for biogas production
Event:
21st European Biomass Conference and Exhibition
Session:
2DV.4.19
Pages:
1242 - 1245
ISBN:
978-88-89407-53-0
Paper DOI:
10.5071/21stEUBCE2013-2DV.4.19
Price:
FREE
