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论文类型：期刊论文

发表时间：2014-07-01

发表刊物：WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY

收录刊物：SCIE、EI、PubMed、Scopus

卷号：30

期号：7

页面范围：1985-1992

ISSN号：0959-3993

关键字：Microbial immobilization; Entrapment carrier; Ammonium oxidation rate; Modification of PVA hydrogel beads

摘要：In this study, we developed a novel technique for preparing polyvinyl alcohol (PVA) hydrogel as an immobilizing matrix by the addition of sodium bicarbonate. This resulted in an increase in the specific surface area of PVA_sodium bicarbonate (PVA_SB) hydrogel beads to 65.23 m(2) g(-1) hydrogel beads, which was approximately 85 and 14 % higher than those of normal PVA and PVA_sodium alginate (PVA_SA) hydrogel beads, respectively. The D (e) value of PVA_SB hydrogel beads was calculated as 7.49 x 10(-4) cm(2) s(-1), which was similar to the D (e) of PVA_SA hydrogel beads but nearly 38 % higher than that of the normal PVA hydrogel beads. After immobilization with nitrifying biomass, the oxygen uptake rate and the ammonium oxidation rate of nitrifying biomass entrapped in PVA_SB hydrogel beads were determined to be 19.53 mg O-2 g MLVSS-1 h(-1) and 10.59 mg N g MLVSS-1 h(-1), which were 49 and 43 % higher than those of normal PVA hydrogel beads, respectively. Scanning electron microscopy observation of the PVA_SB hydrogel beads demonstrated relatively higher specific surface area and revealed loose microstructure that was considered to provide large spaces for microbial growth. This kind of structure was also considered beneficial for reducing mass transfer resistance and increasing pollutant uptake.