文章基本信息

标题：Autotrophic denitrification of synthetic nitrate-contaminated groundwater in up-flow fixed-bed bioreactor by pumice as porous media
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作者：Masoud Tourang ; Behnoush Aminzadeh ; Ali Torabian 等
期刊名称：Environmental Health Engineering and Management
印刷版ISSN：2423-3765
电子版ISSN：2423-4311
出版年度：2018
卷号：5
期号：1
页码：1-7
DOI：10.15171/EHEM.2018.01
语种：English
出版社：Kerman University of Medical Sciences
摘要：Background: Increasing nitrate concentrations in groundwater resources is considered a common environmental and public health problem worldwide. In this research,an autotrophic up-flow bioreactor with pumice as media was used to study the effects of the sulfur-to-nitrogen (S/N) ratio and empty bed contact time (EBCT) on nitrate removal efficiency and byproducts. Methods: Experiments were carried out in a 3.47 L up-flow,fixed-bed reactor with 3 sampling ports. To evaluate the overall impact of S/N ratio and EBCT on the performance of the bioreactor,several phases with different S/N ratios and EBCTs were applied. Results: At a constant S/N ratio of 3.85 g/g,as EBCT decreased from 24 hours to 2 hours,the nitrate removal efficiency decreased from 98% to 64%. On the other hand,at the desired EBCT of 4 hr,as S/N ratio decreased from 3.85 to 1.51 g/g,nitrate removal efficiency was reduced from 85% to 32%. Changing the EBCT and S/N ratio also affected the effluent nitrite and sulfate concentrations as byproducts. At the S/N ratio of 3.85 g/g and EBCT of 24 hours,effluent nitrite and sulfate concentrations were 0.1 mg NO2--N/L and 463 mg SO4 2-/L,respectively. Decreasing the S/N ratio to 1.51 g/g and the EBCT to 4 hours caused drastic changes in effluent nitrite and sulfate concentrations. Conclusion: The results indicated that the autotrophic denitrification with thiosulfate as electron donor and pumice as media was feasible and applicable for nitrate contaminated groundwater..
关键词：Autotrophic Denitrification; Pumice; Nitrate; Nitrite; Thiosulfate