13 research outputs found
Variation in diet composition during the breeding cycle of an Antarctic seabird in relation to its breeding chronology and that of its main food resource
Synergistic Effect of Sulfide and Ammonia on Anaerobic Digestion of Chicken Manure
The effect of the sulfur load on anaerobic digestion of chicken manure
(CM) was investigated in a laboratory scale anaerobic mono-digester at
high total ammonia nitrogen (TAN) concentrations. The digester was
operated for 268 days by increasing the organic loading rate from 0.5 to
2.5kg-VS/m(3)/day and the total Kjeldahl nitrogen up to 5050mg/l. The
CH4 yield of 0.36 +/- 0.02m(3)/kg-VS was achieved at 2.5kg-VS/m(3)/day
of loading rate without any inhibition. The results showed that,
anaerobic mono-digestion of chicken manure was applicable with the
acclimation of microbial consortium to high TAN concentrations. However,
when the sulfur content of the CM fed to the digester increased suddenly
by coincidence, the CH4 yield decreased about 25\% from 0.36 +/- 0.02 to
0.27 +/- 0.03m(3)/kg-VS. As a result, the acetic acid concentration
increased from 130 to 1700mg/l showing that the acetate consuming
methanogens were detrimentally affected from TAN and total sulfide
concentrations above 4000 and 100mg/l, respectively