Comparative study on swine waste digestion by Effective Microorganism (EM) and methane forming bacteria
1996
Suriya Sawanon
Study of swine waste digested under anaerobic condition by EM and methane forming bacteria was carried out to determine comparatively the efficiencies of BOD, COD, TS and TVS removal, total gas production, methane composition, nutritive values of sludge and fertilizing values of sludge and effluent. Two experiments, both utilized RBD were conducted in this study. In the first experiment, swine manure at the concentration of 20 percent was digested in five 4.15 liters reactors. The experimental treatment consisted of control (SM), swine manure added EM in start up (SM & EM), EM treated swine manure (EMSM), EM treated swine manure added methane forming sludge in start up (EMSM & MF) and swine manure added methane forming sludge in start up (SM & MF). Results of the experiment showed that SM & MF and EMSM & MF were not different significant in efficiencies of BOD, COD, TS and TVS removal (P0.05). These two reactors had better efficiencies than the SM and SM & EM (P0.05). EMSM was found to have least efficiencies in BOD, COD, TS and TVS removal (P0.05). EMSM & MF gave the highest value for total gas production (P0.05) but had lower value than SM and SM & MF for methane content (P0.05). While EMSM was found to have least values in both total gas production and methane content (P0.05). In the second experiment, swine waste water was digested in three 10.2 liters anaerobic fixed film reactors. The experimental treatment were control (SW), swine waste water added EM in start up (SW & EM) and swine waste water added methane forming sludge in start up (SW & MF). Results of the second experiment revealed that SW & MF and SW were not different significantly in efficiencies of BOD, COD, TS and TVS removal, while SW & EM was found to have least efficiencies (P0.05).
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