Microbial oxygen uptake in sludge as influenced by compost physical parameters |
| |
| Authors: | Ardavan Mohajer Anne Trémier Suzelle Barrington José Martinez Cecile Teglia Marco Carone |
| |
| Institution: | 2. Cemagref, UR GERE, 17 Av. de Cucillé, CS 64427, F-35044 Rennes Cedex, France;3. Université Européenne de Bretagne, F-35000 Rennes, France;4. Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, 615 N. Wolfe St., Baltimore, MD 21205, USA;1. State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China;2. Institute of Waste Treatment and Reclamation, Tongji University, Shanghai 200092, China;3. Centre for the Technology Research and Training on Household Waste in Small Towns & Rural Area, Ministry of Housing and Urban-Rural Development of PR China (MOHURD), China;1. School of Life Sciences, Heriot Watt University, Edinburgh EH14 4AS, Scotland, UK;2. Cambridge Eco Ltd, 75 Derwent Close, Cambridge CB1 8DY, UK;3. Phil Wallace Limited, 26 Westland, Martlesham Heath, Ipswich IP5 3SU, UK;4. Environment, Earth and Ecosystems, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK;5. Engineering and Innovation, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK;1. Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China;2. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;1. Technical University of Denmark, Department of Environmental Engineering, Bygningstorvet, Building 115, 2800 Kongens Lyngby, Denmark;2. Technical University of Denmark, Department of Applied Mathematics and Computer Science, Richard Petersens Plads, Building 321, 2800 Kongens Lyngby, Denmark;1. College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China;2. Beijing Municipal Research Institute of Environmental Protection, Beijing 100037, China |
| |
| Abstract: | The wide range of optimal values reported for the physical parameters of compost mixtures suggest that their interactive relationships should be investigated. The objective of this study was to examine the microbial O2 uptake rate (OUR) in 16 sludge waste recipes, offering a range of moisture content (MC), waste/bulking agent (W/BA) ratio and BA particle size levels determined using a central composite experimental design. The 3 kg samples were maintained at a constant temperature and aeration rate for 28 days, during which a respirometer recorded O2 uptake to provide a measure of microbial activity and biodegradability. The cumulative O2 consumption after 14 and 28 days was found to be significantly influenced by MC, W/BA ratio, BA particle size and the interaction between MC and W/BA ratio (p < 0.05). Using multivariate regression analysis, the experimental data was used to generate a model with good predictive ability for cumulative O2 consumption after 28 days as a function of the significant physical variables (R2 = 0.84). The prediction of O2 uptake by the model depended highly on the interaction between MC and W/BA ratio. A MC outside of the traditional 50–60% (wet basis) range still resulted in a high level of microbial O2 uptake as long as the W/BA ratio was adjusted to maintain a suitable O2 exchange in the sample. The evolution of OUR in the samples was also investigated, uncovering strong associations between short and long-term respirometric indices, such as peak OUR and cumulative O2 consumption (p < 0.005). Combining peak OUR data with cumulative O2 consumption after 14 days allowed for accurate predictions of cumulative O2 after 28 days of aeration (R2 = 0.96), implying that future studies need only run trials up to 14 days to evaluate the overall O2 consumption or biodegradability of similar sludge mixtures. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
