Removal of ammonium-N from ammonium-rich sewage using an immobilized Bacillus subtilis AYC bioreactor system

查看全文 作　　者：Jingjing Xiao Changxiong Zhu Dongyuan Sun Ping Guo Yunlong [1]Tian

机构地区：[1]Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China.

出　　处：《Journal of Environmental Sciences》索引2011年第23卷第8期,共7页

基　　金：supported by the National Water Special Funding Project on Control and Rectification of Water Body Pollution (No. 2008ZX07425-002, 2009ZX07103002) 摘　　要：A self-design bioreactor system employing a fixed bed operation process with immobilized Bacillus subtilis AYC beads for NH 4 + -N removal from slightly polluted water was proposed. Polyvinyl alcohol and Na-alginate were used as a gel matrix to entrap Bacillus subtilis AYC to form the immobilized beads. The NH 4 + -N removal process was studied in a intermittent operation mode to examine the start-up and steady state behaviors of the immobilized AYC in the reactor. The results indicated that the reactor was in the start-up state during the first week. NH 4 + -N began to be steadily removal since the second week, and the nitrogen removal rate was between 84.61% and 96.19% when the hydraulic retention time (HRT) was 30 min. To apply Bacillus subtilis AYC to develop a practical nitrogen removal system and further understand its nitrogen removal ability, the bioreactor was continuously operated under different experimental perameters. The results showed that under the optimum conditions of an HRT of 20 min and DO of 3.77-5.80 mg/L, the NH 4 + -N removal rate reached 99.55%. The NH 4 + -N removal rate increased as the C/N ratio increased. However, a high C/N may cause a high residual carbon level in the effluent, therefore, the most suitable C/N ratio was 10. In addition, the results showed that the bioreactor system could remove many types of nitrogen such as NH 4 + -N, NO 3 -N and organic-N, and had a good performance for inorganic nitrogen removal from sewage. 关键词：生物反应器系统枯草芽孢杆菌铵态氮污水固定化反应器水力停留时间海藻酸钠操作过程

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Removal of ammonium-N from ammonium-rich sewage using an immobilized Bacillus subtilis AYC bioreactor system

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