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| Effects of newly anaerobic fermentation system onreducing nitrogen and phosphorus contentin sewage of large-scaled pig farms |
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| Abstract: |
| In order to evaluate the operation of anaerobic fermentation system，ten large-scaled pig farms were
selected in Guangdong province to monitor the contents of nitrogen and phosphorus in sewage discharged from the
hoggery and methane tank. The results showed that anaerobic fermentation system effectively decreased the content of
nitrate nitrogen and nitrite nitrogen of hoggery sewage，and the reduction rates of 19.89%-59.02% and 18.75%-83.97%
（2# excluded）were observed for nitrate nitrogen and nitrite nitrogen，respectively. The anaerobic fermentation system
in several pig farms did not performed well in total nitrogen，ammonium nitrogen and total phosphorus as evidenced by
the increase of these index in sewage of methane tank. The reduction rates of total nitrogen，ammonium nitrogen and total
phosphorus were -49.18%-43.14%，-83.72%-21.07% and -13.89%-52.82%，respectively. 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 concentration of NO2
--N and NO3
--N in effluent of pig farm increased significantly，compared to that in effluent of
methane tank，whereas the concentration of TN，NH3-N
and TP in effluent of pig farm decreased sharply in
contrast with the effluent of methane tank. However，the
TP content in effluent of ten farms all exceeded the value
of the discharge standard of pollutants for livestock and
poultry breeding，which would pose a pollution potential
to surrounding environment. |
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