Design And Experimental Research On Nitrogen And Phosphorous Removal Efficiency Of A Chlorella-based Photobioreactor

Nowadays, the problems of water pollution, especially the nitrogen and phosphorus pollution has been becoming a global environmental issue. These years processing sewage utilizing the algae biotechnology is also concerned by the entire community. This research mainly investigates the potential of nitrogen and phosphorous removal efficiency from synthetic wastewater by Chlorella Photobioreactor which was designed by myself. In order to explore the optimal conditions for Chlorella Photobioreactor to deal with sewage include nitrogen and phosphorous respectively, impacts of the factors of temperature and minute ventilation volume on nitrogen and phosphorous removal efficiency have been discussed in detail. The main conclusions of the whole thesis are as follows:1. An airlift photobioreactor for Chlorella has been designed and manufactured technically using the CFD fluent simulation technology and theoretical research. Ascertained the ratio of height and diameter for this photobioreactor is 5 and the diameter is 96 mm for the draft tube based on the results of Fluent simulation;2. Studied on the effects of ventilation volume and temperature on removal efficiency of the nitrogen and phosphorous from artificial urine and oxygen creation. The results show that the most optimized condition for photobioreactor for Chlorella dealing with the artificial urine is under 25℃and 2L/min ventilation volume. Under this condition, the removal efficiency is 79.26% for TP, 86.70% for TN and 71.72% for COD;3. Discussed the effects on removal efficiency of nitrogen and phosphorous from artificial urban sewage. The results show that under the condition of 25℃ and 2L/min ventilation volume, the removal efficiency is 98.65% for TP, 84.87% for TN and 85.06% for COD;4. Initially discussed the continuous dealing efficiency of artificial urine and urban sewage for Chlorella utilizing the flat panel Photobioreactor made by self, and found the removal efficiency of nitrogen, phosphorous and COD is good, but no more favorable than the effect by using airlift Photobioreactor.