%0 Journal Article
%T Diffusion Coefficients of Ammonia, Nitrate and Nitrite in Cell-free and Cell-containing PVA Gel Membranes<br>氨氮、硝酸盐氮和亚硝酸盐氮在PVA凝胶膜中的扩散性能
%A Cao Guomin
%A Zhao Qingxiang
%A Sun Xianbo
%A Zhang Tong
%A <br>曹国民
%A 赵庆祥
%A 孙贤波
%A 张彤
%J 环境科学
%D 2002
%I 
%X The cell free PVA gel membrane and cell containing PVA gel membrane were prepared by iterative freezing and thawing, and the diffusion coefficients of ammonia, nitrate and nitrite in PVA gel membranes were determined. The effect of the conditions of preparing PVA gel membranes and cell concentration on the diffusion coefficients of ammonia in PVA gel membranes were investigated. The results shown the diffusion coefficients of ammonia in PVA gel membranes decreased while the iteration times of freezing thawing or PVA concentration or cell concentration increased. The diffusion coefficients of ammonia, nitrate and nitrite in cell free PVA gel membranes (PVA concentration was 15%) were 0.69×10-9 m2/s, 0.52×10-9 m2/s, and 0.56×10-9 m2/s, respectively. The diffusion coefficients of ammonia, nitrate and nitrite in cell containing PVA gel membranes (the cell concentration was 60g/L) were 0.55×10-9 m2/s, 0.46×10-9 m2/s, and 0.45×10-9 m2/s, respectively.
%K iffusion coefficient
%K immobilized cells
%K PVA
%K biological nitrogen removal<br>扩散系数
%K 固定化细胞
%K PVA
%K 生物脱氮
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=EB09C4FC3BA46CD6&yid=C3ACC247184A22C1&vid=EA389574707BDED3&iid=0B39A22176CE99FB&sid=8BD23BD67BF01A5C&eid=68D88C2FCF9C3098&journal_id=0250-3301&journal_name=环境科学&referenced_num=5&reference_num=11