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| Analysis and evaluation of sewage discharge fromlarge-scaled pig farms in Guangdong province |
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| Abstract: |
| Ten large-scaled pig farms in Guangdong province were selected to monitor the pollutant contents
in sewage discharged from the farms. The results showed that，concentrations of ammonia nitrogen（NH3-N），
total phosphorus（TP），CODCr，BOD5，total suspended solids（TSS）and fecal coliforms were 277.4-921.8 mg/L，
57.6-132.8 mg/L，677.4-5 046.9 mg/L，248.2-4 122.5 mg/L，374.8-3 290.3 mg/L and 75 420×104-3 961 610
×104，respectively. Significant decreases of 10.9%-97.8%，33.4%-99.0%，75.4%-95.1%，25.6%-99.3%，
54.0%-97.3% and 55.7%-99.9% were observed for pollutants mentioned above as the piggery sewage treated with the
sewage disposal systems. The discharge standard of pollutants for livestock and poultry breeding was used to evaluate
the potential sewage contamination by nutrients，organic pollutants，TSS and fecal coliforms. The results indicated
that fecal coliform bacteria exceeded the standard in most pig farm sewage，while NH3-N，TP，CODCr，BOD5 and TSS
exceeded the standard in sewage mainly from the pig
farms in Yuanzhou，Luoyang，Longxi and Changning
towns. In summary，the sewage disposal systems
performed well in purifying piggery sewage，however，
several pollutants especially fecal coliforms in pig farm
discharge exceeded the standard due to other exogenous
pollutant sources |
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