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Abstract
The experiment was conducted to investigate continuous hydrogen production with lower cost and sulphate‐rich wastewater treatment. In this paper, both anaerobic bio‐treatment of sulphate‐rich wastewater and hydrogen production were applied to construct a laboratory‐scale combined sulphur cycle based system. The system consisted of two reactors, which were a photocatalytic reactor and an anaerobic bioreactor, respectively. In the anaerobic bioreactor, sulphate‐reducing bacteria (SRB) converted SO4 2− to S2−. The produced S2− yielded by SRB was further used as a sacrificial reagent to produce H2 in the photocatalytic reactor. Then, S2− was changed into SO4 2−, which returned to the anaerobic bioreactor for treatment again. The present study highlighted an advantage compared with the conventional method, in that no extra S2−was added to the photocatalytic reactor, which reduced the total cost and realized continuous hydrogen production. The average COD removal efficiency was 79.6%.
Acknowledgements
The authors gratefully acknowledge the financial support from the Program for New Century Excellent Talents in University (NCET‐07‐0683) and the National Basic Research Program of China (no. 2009CB220000).