Efficacy of hydrolytic enzyme augmentation and thermochemical pretreatments for increased secondary anaerobic digestion of treated municipal sewage sludges |
| |
Authors: | Nagle N J Rivard C J Adney W S Himmel M E |
| |
Institution: | 1.Biotechnology Research Branch Fuels & Chemicals Research & Engineering Division, Solar Energy Research Institute, 80401, Golden, CO ; |
| |
Abstract: | Rising costs for landfill disposal of municipal sewage residues have prompted evaluation of alternative methods for reducing
the bulk of the final waste. Representative samples of municipal sewage sludge residues were obtained from three major treatment
plants in the United States, including Los Angeles (Hyperion), Denver (North Metro), and Chicago (Stickney). The majority
of the treated, dewatered sewage sludge solids was found to be volatile (50–60%) and, presumably, biodegradable. Additionally,
much of the volatile content was solubilized by both acid detergent fiber and neutral detergent fiber treatments, and was
presumed to be proteineous microbial biomass in nature. Both low- and high-solids anaerobic digester systems, as well as the
standard biochemical methane potential (BMP) assay, were utilized to evaluate the anaerobic digestibility of these sewage
sludge residues. The low methane yields and, thus, the poor organic waste conversion indicated the need for treatment prior
to bioconversion. The effectivenesss of various pretreatments based on assessment of increased soluble protein or organics
and anaerobic digestibility as determined by the BMP assay was evaluated. |
| |
Keywords: | Index Entries" target="_blank">Index Entries Sewage sludge pretreatment thermochemical enzyme anaerobic digestion CSTR high solids BMP |
本文献已被 SpringerLink 等数据库收录! |
|