Study On Treatment Of Livestock And Poultry Wastewater And Preparation Of Fuel Cells By Micro Algae

Due to Microalgae require low living environment and can effectively reduce the content of COD,nitrogen,phosphorus and heavy metal,so it is used to treat wastewater.There has electrons produced and passed during the growth and metabolism of microalgae.If the electrons can be efficiently exported from cells,and through microbial fuel cells equipment,it can generate current.The research content of this task is to combine wastewater treatment with electricity production effectively.A total of 15 species of algae were used in this task.After drawing the growth curves of these 15 species of algae,the selection experiment of algae for domestication and wastewater treatment was carried out.Finally,10 strains of algae that can grow will in wastewater were screened out.Dividing 10 species of algae into 2 groups,and each group were conducted wastewater treatment experiment respectively.Then determining the concentration of COD、TN、TP in wastewater every day.After 8 days of processing,there were 5 strains of algae is prominent.The degradation capacity was from high to low:Cl-7、KJ1-7、Twg-13、C366、Th-10.The best degradation capacity of COD is Twg-13,its degradation rate up to 29.85%.The best degradation capacity of TP is KJ1-7,its degradation rate up to 73.2%.And the best degradation capacity of TN is Cl-7,its degradation rate up to 52.62%.Because of the growth of algae in the wastewater was inhibited,the experiment of diluting the wastewater with different concentration gradients was carried out.After 8 days of incubation,the algae Th-10,Cl-7 and C366 grew best in diluted 5 times wastewater,and the algae KJ1-7 grew best in diluted 8 times wastewater.There was no significant difference in the growth of Twg-13 in diluted 8 times and 10 times wastewater.An H-type dual chamber microbial fuel cell reactor was built in this task.Taking BG-11 as blank to do the control experiment is to verify that microalgae can produce electricity.The results showed that microalgae can produce electricity,and the voltage can be maintained at about 20mV.Then,the internal resistance and open circuit voltage of 5 microbial fuel cells with BG-11 as substrate were determined,and the theoretical maximum output power was calculated.The results showed that the internal resistance of C366 was the lowest,the internal resistance of KJ1-7 was the highest.The open circuit voltage of KJ1-7 was the highest,and the lowest open circuit voltage was C1-7 among 5 species of algae.The theoretical maximum output power of KJ1-7 is the highest,followed by C366,Th-10,Twg-13 and Cl-7.Finally,the optimization experiment of the anode electrode was carried out.The results showed that the optimized anode electrode had significant effect on the internal resistance and open circuit voltage.However,there was no significant effect on the theoretical maximum output power.After proving that wastewater as substrate contributed very little to the production capacity,the experiment of wastewater-microalgae electricity production of algae KJ1-7、C366 and Th-10 was conducted.The results showed that the theoretical maximum output power of Th-10 was the highest among the 3 dominant species.