Author/Authors :
Ge، Zhigang نويسنده 1College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing, P.R. China , , Zhang، Hui نويسنده , , Zhang، Yuejin نويسنده College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing, P.R. China , , Yan، Long-cheng نويسنده , , Zhao، Yongjun نويسنده College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing, P.R. China ,
Abstract :
The high-strength wastewater is now well known as a threat to the natural water since it is highly possible to
arouse water eutrophication or algal blooms. The effects of various light emitting diode wavelengths and intensities
on the microalgae biological wastewater treatment system was studied in this research. The various nutrient
removals and economic efficiencies represented similar variation trends, and these variations under both high C
and N loading treatments were similar too. The order for microalgae C. vulgaris reproduction in terms of dry weight
and nutrient removal efficiency both were red > white > yellow > blue, under high carbon and nitrogen loading
treatments, indicating that the red light was the optimum light wavelength. Furthermore, considering the optimal
light intensity in terms of nutrient removal efficiency was 2500 and 2000 ?mol/m2•s, while in terms of economic
efficiency was 1000, 1500 and 2000 ?mol/m2•s. Therefore, the optimum light intensity was found to be 2000 ?mol/
m2•s. In addition, the optimal experimental illumination time was determined as 120 h. The Chlorella vulgaris
microalgae biological wastewater treatment system utilized in this research was able to purify the high-strength
carbon and nitrogen wastewater effectively under optimum light wavelength and intensity.
