Changes in physicochemical and microbial community during co-composting of oil palm frond with palm oil mill effluent anaerobic sludge
Ahmad, Mohd Najib and Mokhtar, Mohd Noriznan and Samsu Baharuddin, Azhari and Lim, Siong Hock and Ahmad Ali, Siti Ramlah and Abd. Aziz, Suraini and Abdul Rahman, Nor'aini and Hassan, Mohd Ali (2011) Changes in physicochemical and microbial community during co-composting of oil palm frond with palm oil mill effluent anaerobic sludge. BioResources, 6 (4). pp. 4762-4780. ISSN 1930-2126
Official URL: http://ojs.cnr.ncsu.edu/index.php/BioRes/article/v...
The aims of this study were to investigate the physicochemical changes and microbial population during co-composting of 1 ton oil palm frond (OPF) with 1,000 L palm oil mill effluent (POME) anaerobic sludge. In the first 30 days of composting, the temperature of the composting piles was observed in the thermophilic phase, within a range of 50 - 56 Â°C. Meanwhile, the oxygen level, moisture content, and pH profiles of the compost were maintained at 2.0 to 12%, 60 to 70%, and 7.9 to 8.5, respectively, throughout the composting process. The total bacteria count was estimated to be about 55 x 1010 CFU/mL in the mesophilic phase, and then it increased up to 66 x 1010 CFU/mL in the thermophilic phase, and finally decreased to 9.0x1010 CFU/mL in the curing phase. The initial C/N ratio, 64, decreased to 18 after 60 days of composting process, indicating the maturity of compost product from OPF-POME anaerobic sludge. The diversity of the bacterial community was investigated using polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) analysis. The results suggested that the co-composting process of OPF with POME anaerobic sludge was dominated by Pseudomonas sp.
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