Putative anaerobic activity in aerated composts |
| |
Authors: | C F Atkinson D D Jones J J Gauthier |
| |
Institution: | (1) Department of Biology, University of Alabama at Birmingham, 35294 Birmingham, AL, USA;(2) Present address: Kennedy Space Center, NASA, Mail Code MD-RES, 32899, FL, USA |
| |
Abstract: | It has been suggested that anaerobic microenvironments develop in aerobic composts, regardless of the aeration system used, and that anaerobic activity is responsible for odor generation and nitrogen losses. This study was designed to measure levels of microorganisms capable of anaerobic growth in two aerated composts: municipal solid waste, a relatively nutrient-rich compost, and pulp and paper-mill solid waste, which is relatively nutrient-poor. Anaerobic microorganisms were isolated from both composts at mesophilic and thermophilic temperatures. The majority of the anaerobic mesophiles were facultative anaerobes, whereas facultative, anaerobic thermophiles varied from 0 to 100%. Serially-diluted samples were spot-plated onto various media to preserve microbial consortia. Levels of aerobic and anaerobic exoenzyme production on spot-plates were similar on cell-wall, starch, and casein media. Although microbial levels on spread plates indicate that aerobes are present in much higher numbers than anaerobes (in 47 of 56 subsamples, 90% of the population were aerobes), microbial growth levels and exoenzyme production on spot-plates indicate that anaerobes may be responsible for a large portion (greater than or equal to 72%) of the metabolic activity in anaerobic microenvironments of aerobic composts. |
| |
Keywords: | enzymes anaerobes municipal solid waste pulp and paper |
本文献已被 SpringerLink 等数据库收录! |
|