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A continuous stirred hydrogen-based polyvinyl chloride membrane biofilm reactor for the treatment of nitrate contaminated drinking water
- Xia, Siqing, Zhang, YanHao, Zhong, FoHua
- Bioresource technology 2009 v.100 no.24 pp. 6223-6228
- biofilm, denitrification, drinking water, effluents, electrons, hydrogen, nitrate reduction, nitrates, nitrites, nitrogen content, poly(vinyl chloride), sulfates, water pollution
- 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 100days, and the result showed that the average nitrate denitrification rate of 1.2g [formula removed]-N/m²d and the total nitrogen (TN) removal of 95.1% were achieved with the influent nitrate concentration of 50mg [formula removed]-N/L and the hydrogen pressure of 0.05MPa. Under the same conditions, the average rate of hydrogen utilization by biofilm was 0.031mgH₂/cm²d, which was sufficient to remove 50mg [formula removed]-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.