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Effects of the addition frequency of trace metals on biogas production characteristics in dairy manure by anaerobic fermentation

ZHANG Han1,2,LI Wenzhe2(1.Agricultural Engineering College,Tarim University of Agricultural Reclamation,Alar Xinjiang 843300,PRC;2.Engineering College,Northeast Agricultural University,Harbin Heilongjiang 150030,PRC)  
In order to research the effects of trace metal elements on the anaerobic fermentation characterization of dairy manure,Fe,Co,Ni was added into the anaerobic fermentation reactor on every 1,3,5,7 days.Theresults showed that a appropriate frequency of the addition trace metals is every seven days.It′s biogas rate and the COD removal rate is the highest.In the reactor by swinging trace metals every day the biogas production is the lowest,perhaps a redundant supplement of trace metals could cause toxic.
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