Journal
BIORESOURCE TECHNOLOGY
Volume 264, Issue -, Pages 24-34Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.05.051
Keywords
Acid mine drainage; Sulfate removal; Revolving algae biofilm; Microbial community
Funding
- China Scholarship Council
- Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences
- Iowa State University
- National Natural Science Foundation of China [41373100]
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Industries such as mining operations are facing challenges of treating sulfur-containing wastewater such as acid mine drainage (AMD) generated in their plant. The aim of this work is to evaluate the use of a revolving algal biofilm (RAB) reactor to treat AMD with low pH (3.5-4) and high sulfate content (1-4 g/L). The RAB reactors resulted in sulfate removal efficiency up to 46% and removal rate up to 0.56 g/L-day, much higher than those obtained in suspension algal culture. The high-throughput sequencing revealed that the RAB reactor contained diverse cyanobacteria, green algae, diatoms, and acid reducing bacteria that contribute the sulfate removal through various mechanisms. The RAB reactors also showed a superior performance of COD, ammonia and phosphorus removal. Collectively, the study demonstrated that RAB-based process is an effective method to remove sulfate in wastewater with small footprint and can be potentially installed in municipal or industrial wastewater treatment facilities.
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