Study the biocatalyzing effect and mechanism of cellulose acetate immobilized redox mediators technology (CE-RM) on nitrite denitrification |
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Authors: | Haibo Li Jianbo Guo Jing Lian Zhenhua Xi Lijun Zhao Xiaoyu Liu Chenxiao Zhang Jingliang Yang |
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Institution: | 1. School of Environmental Science and Engineering, Hebei University of Science and Technology, Yuhua East Road 70#, Shijiazhuang, 050018, People’s Republic of China
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Abstract: | The biocatalyzing effect of a novel cellulose acetate immobilized redox mediators technology (CE-RM) on nitrite denitrification process was studied with anthraquinone, 1,8-dichloroanthraquinone, 1,5-dichloroanthraquinone and 1,4,5,8-tetrachloroanthraquinone. The results showed that the immobilized 1,4,5,8-tetrachloroanthraquinone presented the best biocatalyzed effect which increased nitrite denitrification rate to 2.3-fold with 12 mmol/L 1,4,5,8-tetrachloroanthraquinone. The unequal biocatalyzing effect was due to the quantity and position of –Cl substituent in anthraquinone-structure. Moreover, the nitrite denitrification rate was increased with the oxidation reduction potential (ORP) values becoming more negative during the biocatalyzing process. The stabilized ORP value with 12 mmol/L immobilized 1,4,5,8-tetrachloroanthraquinone were 81 mV lower than the control. At the same time, the more OH? was produced with the higher nitrite removal rate achieved in the nitrite denitrification process. In addition, a positive linear correlation was found between the nitrite removal reaction constants k gNO2 ?–N/(gVSS d)] and immobilized 1,4,5,8-tetrachloroanthraquinone concentration (C 1,4,5,8-tetrachloroanthraquinone), which was k = 1.8443 C 1,4,5,8-tetrachloroanthraquinone + 33.75(R 2 = 0.9411). The initial nitrite concentration of 179 mgNO2 ?–N/L resulted in the maximum nitrite removal rate, which was 6.526gNO2 ?–N/(gVSS d)]. These results show that the application of cellulose acetate immobilized redox mediators (CE-RM) can be valuable for increasing nitrite denitrification rate. |
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