A novel algal biofilm membrane photobioreactor for attached microalgae growth and nutrients removal from secondary effluent

Bioresource Technology, Volume 179, March 2015, Pages 8-12. 

Feng Gao1,2, Zhao-Hui Yang2,3, Chen Li1, Guang-Ming Zeng2,3, Dan-Hui Ma1, Li Zhou1

  1. College of Marine Science, Zhejiang Ocean University, Zhoushan 316000, China and
  2. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China and
  3. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.

 

 

Abstract

In this study, a novel algal biofilm membrane photobioreactor (BMPBR) equipped with solid carriers and submerged membrane module was developed for attached growth of Chlorella vulgaris and secondary effluent treatment. The volumetric microalgae production achieved in BMPBR was 0.072 g L−1 d−1, which was 1.44-fold larger than that in suspended growth membrane photobioreactor (MPBR). Furthermore, 72.4% of the total produced algal biomass was immobilized as algal biofilm in BMPBR. Advanced nutrients removal from secondary effluent was achieved both in BMPBR and MPBR, with average reduction of about 85% for PO43−-P in the stable stage. Additionally, BMPBR showed better nitrogen removal performance than MPBR due to its higher algal biomass productivity. Moreover, with the filtration effect of the submerged membrane module in the reactor, suspended microalgae could be completely isolated from the effluent and a low average SS concentration of 0.28 mg L−1 was achieved in the effluent of BMPBR.

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A novel algal biofilm membrane photobioreactor for attached microalgae growth and nutrients removal from secondary effluent. Renewable Energy Global Innovations

 

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