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| Effects of anaerobic fermentation on reducing organicpollutants in sewage of large-scaled pig farms |
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| Abstract: |
| Anaerobic fermentation technology is widely used to treat piggery sewage. 10 large-scaled pig
farms were selected and the organic pollutants in sewage from hoggery and newlybuilt methane tank were monitored
dynamically. The value of CODCr and BOD5 in hoggery sewage ranged from 1057.6 to 3873.7 mg/L and 1847.8 to
5515.4 mg/L，respectively. In sewage discharged from the methane tank，value of CODCr and BOD5 ranged from 266.7
to 1 420.4 mg/L and 534.4 to 2 490.2 mg/L，respectively. The value of CODCr and BOD5 in hoggery sewage reduced
63.33%-90.09% and 54.82%-87.06%，respectively，as treated by anaerobic fermentation system. The ratio of
BOD5/CODCr in sewage of methane tank was 0.53-0.71，which facilitated the subsequent aerobic treatments. Sewage
discharged from the methane tank received further treatment by the fish pond and oxidation pond and then discharged
out of the pig farm. The concentrations of COD and BOD
in effluent of pig farm increased significantly compared
to that in effluent of methane tank. Among the 10 pig
farms，contents of COD and BOD in the effluent of
nine pig farms met the value of the discharge standard
of pollutants for livestock and poultry breeding，which
did not pose any pollution potential on surrounding
environment. |
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