Evaluation of the Digestibility of Attached and Suspended Growth Sludge in an Aerobic Digester for a Small Community
AbstractThe aerobic sludge digestion process for waste sludge generated from suspended biomass (i.e., activated sludge process, ASP) and attached biomass (i.e., moving bed bioreactor, MBBR and modified packed bed biofilm, PBBR) reactors in a residential complex were analyzed. The rate of digestion with respect to different sludge characteristics generated through these various treatment processes were examined; the results revealed that waste sludge from ASP took 16 days to achieve complete digestion while MBBR and PBBR took nine and seven days, respectively. The most important factors influencing the sludge digestion such as sludge volume index (SVI), mixed liquor suspended solid (MLSS), and mixed liquor volatile suspended solid (MLVSS) were examined. The ASP which had the highest initial MLSS and MLVS took a longer time for digestion. Aerobic sludge digestion in all the treatment reactors was studied under laboratory scale conditions in batch experimentation to evaluate sludge characteristics and the rate of digestion as well as through a continuous bench scale pilot system to optimize the process parameters. Removal efficiencies of volatile solids (VS) 90.71% in ASP, 84.27% in MBBR and 84.07% in PBBR in aerobic digestion during batch mode were also observed. The study revealed that the aerobic sludge digestion process utilized in curbing sludge is not feasible application for a small community due to very long digestion times and a large amount of space although Packed Bed Biofilm (PBBR) used the lowest time (seven days) compared to the other systems. View Full-Text
Scifeed alert for new publicationsNever miss any articles matching your research from any publisher
- Get alerts for new papers matching your research
- Find out the new papers from selected authors
- Updated daily for 49'000+ journals and 6000+ publishers
- Define your Scifeed now
Azizi, S.; Kamika, I.; Tekere, M. Evaluation of the Digestibility of Attached and Suspended Growth Sludge in an Aerobic Digester for a Small Community. Water 2018, 10, 161.
Azizi S, Kamika I, Tekere M. Evaluation of the Digestibility of Attached and Suspended Growth Sludge in an Aerobic Digester for a Small Community. Water. 2018; 10(2):161.Chicago/Turabian Style
Azizi, Shohreh; Kamika, Ilunga; Tekere, Memory. 2018. "Evaluation of the Digestibility of Attached and Suspended Growth Sludge in an Aerobic Digester for a Small Community." Water 10, no. 2: 161.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.