Title: Study on the Water Body of Aquiculture for Aerobic Simultaneous Nitrification-Denitrification
Abstract: Seven denitrifying bacteria strains were screened,and NH_4~+ was converted NO_2~-,NO_2~- by those strains,furthermore, they was reduced to N_2 under aerobic conditions,and NO_2~- was accumulated.200 mg/L of NH_4~+ was removed for 36 h.The removal rate of NH_4~+ is at 99 %.The appropriate pH and temperature for the growth of mixed bacteria was 79 and 30 ,respectively.pH control policy for the high density mixed culture in 10 L fermentor was proposed.By controlling pH value lower then 8 in the early stage and without controlling pH afterwards,cell growth period was shortened and NH_4~+ removal rate was improved,dry cell weight reached at 3.9 g/L,increased 62.5 % higher than that under natural pH conditions.Immobilization of the denitrifying bacteria was more stable and more active cells than the dissociated bacteria.The ratio of the former to the latter in the denitrification rate was at 70 %.
Publication Year: 2005
Publication Date: 2005-01-01
Language: en
Type: article
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