Large content of total nitrogen (TN) in the tail water discharged from industrial wastewater treatment plant is likely to cause eutrophication in surface water. In order to improve the removal efficiency of TN in the tail water, we investigated into the removal rate of TN by biofilm floating bed strengthened with different amounts of rice straw (0, 0.18 g/L, and 0.54 g/L) by simulated static and dynamic stabilization pond experiment. Static experiment result showed that the removal rate of TN increased significantly along with the increment of rice straw amount; after 10 days, the removal rate of TN was respectively 18%, 40%, and 93% when 0 (CK), 0.18 g/L (T1), and 0.54 g/L (T2) rice straw were added into the floating bed. Dynamic experiment result revealed that the mean TN removal rate of CK, T1 and T2 was respectively 10%, 22%, and 49% when the hydraulic retention time (HRT) was 4 d; no significant difference was found in COD concentration in the influent and effluent under the three conditions due to the fact that rice straw provides organic matter for heterotrophic denitrifying bacteria in biofilms by slowly releasing carbon source.
Key words
industrial tail water /
rice straw /
biofilm /
floating bed /
total nitrogen /
COD
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References
[1] 苑天晓.外加碳源人工湿地处理污水厂尾水的脱氮工艺研究[D].北京:北京林业大学, 2016.
[2] 郑水生.复合生态浮床对微污染水体的修复研究[D].广州:广东工业大学,2011.
[3] 王凌骅.生态浮床技术研究进展与展望[J].绿色科技,2017(8):65-66.
[4] ZHANG L, ZHAO J, CUI N, et al. Enhancing the Water Purification Efficiency of a Floating Treatment Wetland Using a Biofilm Carrier[J]. Environmental Science & Pollution Research International, 2016, 23(8):7437-7443.
[5] YEH N, YEH P, CHANG Y H. Artificial Floating Islands for Environmental Improvement[J]. Renewable & Sustainable Energy Reviews, 2015, 47: 616-622.
[6] PAVLINERI N, SKOULIKIDIS N T, TSIHRINTZIS V A. Constructed Floating Wetlands: A Review of Research, Design, Operation and Management Aspects, and Data Meta-analysis[J]. Chemical Engineering Journal, 2017, 308:1120-1132.
[7] ZHAO D, ZHANG M, LIU Z, et al. Can Cold-season Macrophytes at the Senescence Stage Improve Nitrogen Removal in Integrated Constructed Wetland Systems Treating Low Carbon/Nitrogen Effluent?[J]. Bioresource Technology, 2018, 265:380.
[8] LIU J, WANG F, LIU W, et al. Nutrient Removal by Up-scaling a Hybrid Floating Treatment Bed (HFTB) Using Plant and Periphyton: From Laboratory Tank to Polluted River[J]. Bioresource Technology, 2016, 207:142-149.
[9] 杨 娇,卢岩飞.植物-自然生物膜浮床在水体修复中的应用[J].环境科学与技术,2016,39(增刊1):293-298.
[10]CAO W, ZHANG Y. Removal of Nitrogen (N) from Hypereutrophic Waters by Ecological Floating Beds (EFBs) with Various Substrates[J]. Ecological Engineering, 2014, 62:148-152.
[11]TANG C C, TIAN Y, LIANG H, et al. Enhanced Nitrogen and Phosphorus Removal from Domestic Wastewater via Algae-assisted Sequencing Batch Biofilm Reactor[J]. Bioresource Technology, 2018, 250:185-190.
[12]OBAJA D,MACÉ S,MATA-ALVAREZ J.Biological Nutrient Removal by a Sequencing Batch Reactor(SBR) Using an Internal Organic Carbon Source in Digested Piggery Wastewater[J].Bioresource Technology,2005,96(1):7-14.
[13]邵 留,徐祖信,金 伟,等.以稻草为碳源和生物膜载体去除水中的硝酸盐[J].环境科学,2009,30(5):1414-1419.
[14]曹文平.研究稻草填料碳源释放、脱氮效果及动力学研究[D].徐州:中国矿业大学,2015.
[15]汪松美,周晓红,储金宇,等.空心菜浮床+仿生植物系统对污染物去除效果[J].环境科学与技术,2013,36(3):78-82.
[16]LOPEZ-PONNADA E V,LYNN T J,PETERSON M,et al. Application of Denitrifying Wood Chip Bioreactors for Management of Residential Non-point Sources of Nitrogen[J]. Journal of Biological Engineering,2017,11(1):16.
[17]杨林燕,海热提,李 萌,等.碳纤维湿地式浮床对微污染水体的净化研究[J].环境科学与技术,2013,36(11):136-141,180.
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