title: A continuous stirred hydrogen-based polyvinyl chloride membrane biofilm reactor for the treatment of nitrate contaminated drinking water.
abstract: A continuous stirred hydrogen-based polyvinyl chloride (PVC) membrane biofilm reactor (MBfR) was investigated to remove nitrate from the drinking water. The reactor was operated over 100 days, and the result showed that the average nitrate denitrification rate of 1.2 g NO(3)(-)-N/m(2) d and the total nitrogen (TN) removal of 95.1% were achieved with the influent nitrate concentration of 50 mg NO(3)(-)-N/L and the hydrogen pressure of 0.05 MPa. Under the same conditions, the average rate of hydrogen utilization by biofilm was 0.031 mg H(2)/cm(2) d, which was sufficient to remove 50 mg NO(3)(-)-N/L from the contaminated water with the effluent nitrate and nitrite concentrations below drinking water limit values. The average hydrogen utilization efficiency was achieved as high as 99.5%. Flux analysis demonstrated that, compared to sulfate reduction, nitrate reduction competed more strongly for hydrogen electron, and obtained more electrons in high influent nitrate loading.
authors: State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. siqingxia@tongji.edu.cn
authors: Siqing
authors: S
authors: Xia
authors: YanHao
authors: Y
authors: Zhang
authors: FoHua
authors: F
authors: Zhong
mesh_terms: D018441:Biofilms; D019149:Bioreactors; D004583:Electrons; D006859:Hydrogen / Q000737:chemistry*; D008567:Membranes, Artificial; D009566:Nitrates / Q000302:isolation & purification*; D009573:Nitrites / Q000302:isolation & purification; D009584:Nitrogen / Q000302:isolation & purification; D011143:Polyvinyl Chloride / Q000737:chemistry*; D013431:Sulfates / Q000302:isolation & purification; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*; D014881:Water Supply / Q000032:analysis*
chemical_list: D008567:Membranes, Artificial; D009566:Nitrates; D009573:Nitrites; D013431:Sulfates; D014874:Water Pollutants, Chemical; D006859:Hydrogen; D011143:Polyvinyl Chloride; D009584:Nitrogen