ABSTRACT
Presently the main industrial De-NOx measures are SCR and SNCR, which both have the disadvantages of high capital investment, complex operation, and vulnerability for secondary pollution and low NO removal rate was still (Jin Y.M et al. 2005). The bio-denitrification can overcome these defects and is considered as a promising technology. Wei Li (2003) used Fe(II)EDTA as complexing agent to absorb NO from flue gas and because Fe(II) EDTA was continuously consumed by the oxygen in the flue gas, it needed another system to reduce Fe(III)EDTA to Fe(II)EDTA and nitrogen oxide to nitrogen in anaerobic environments. These led
1 INTRODUCTION
During recent decades, developing renewable energy has become the global consensus (Petroleum B. 2008). Microalgae is considered as an ideal feedstock for biodiesel due to high reproducibility, rapid growth, shortened growing cycle, high photosynthetic rate, no competition for cropping land, and resilient to climate change (Rittmann B.E. 2008, Smith V.H et al. 2010). But the high cultivation cost challenged its application at larger industrial scale. To develop low-cost cultivation technology has become a focus in many countries (Miao X.L & Q.Y. Wu. 2004, Zhou et al. 2006, Kalva, A. et al. 2008).
