Enhanced Denitrification Performance by Addition of Polycaprolactone and Ceramsite

doi:10.3969/j.issn.1673-1689.2018.02.013

Home > Archive>Volume 37, Issue 2, 2018 >195-201. DOI:10.3969/j.issn.1673-1689.2018.02.013

Enhanced Denitrification Performance by Addition of Polycaprolactone and Ceramsite
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                        10.3969/j.issn.1673-1689.2018.02.013
                    
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Polycaprolactone（PCL） and ceramsite were used as the solid denitrification carbon source and biofilm carrier respectively for the efficiency enhancement of denitrification. The performance of dissolved organic carbon（DOC） releasing of PCL as well as its roles in the denitrification process was investigated under microbial and amicrobic condition. Further research about the effect of ceramsite addition on denitrification efficiency was carried out by blending PCL with different dosages of ceramsite. Results showed that the DOC releasing rate was fast in the initial period（24 h） with the value of 0.656 mg/（g·d），then became slow and stable（0.095 mg/（g·d）），under amicrobic condition. However，the DOC releasing rate under microbial condition（0.286 mg/（g·d）） was much faster than those under amicrobic condition（0.123 mg/（g·d）），manifesting a 1.33 times of enhancements. This indicated that biological processes could significantly increase the efficiency of DOC release from PCL. Moreover，addition of ceramsite to PCL could improve the denitrification performance. The addition of 20，50 g and 100 g ceramsite to 100 g PCL led to the increase of denitrification rates from 0.813 mg/（L·h）（no addition） to 0.894 mg/（L·h），1.015 mg/（L·h） and 1.056 mg/（L·h），respectively. In addition，no NO2--N accumulation was observed during these processes，while a bit of soluble microbial products（SMP） accumulation was identified by Fluorescence EEM spectra.

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ZHU Xiaowei, MIAO Hengfeng, RUAN Wenquan. Enhanced Denitrification Performance by Addition of Polycaprolactone and Ceramsite[J]. Journal of Food Science and Biotechnology,2018,37(2):195-201.

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