Keywords

Eutrophication Of Total Nitrogen And Total Phosphorus In Spirulina Platensis Biogas Slurry

Abstract

In an outdoor pilot-scale racetrack tank, the biogas slurry treated by coagulation and sedimentation was used to cultivate highly pollution-resistant Spirulina platensis. The growth of Spirulina and the removal of nitrogen and phosphorus in the biogas slurry were studied. The amount of nitrogen and phosphorus in the biogas slurry was calculated. The conversion efficiency of nitrogen and phosphorus into Spirulina. On this basis, combined with the small-scale study, the problems and countermeasures in the process of using biogas slurry to cultivate Spirulina on an outdoor scale were analyzed and summarized. Taking 12 days as a culture cycle, a total of Six batches of culture tests were conducted, of which the concentration of Spirulina cultured in three batches could meet the harvest requirements (D560>0.8); while the other three batches failed to harvest Spirulina. Among the three successful culture batches, Spirulina was harvested. COD, ammonia nitrogen, total nitrogen, and total phosphorus in the biogas slurry after harvesting were reduced by 28.6%~48.5%, 30.4%~48.5%, 41.8%~48.6%, and 14.3%~94.5% respectively; the total nitrogen and total phosphorus removed were transferred to The conversion rates of Spirulina cells were 12.1%~98.5% and 21.2%~83.7% respectively. The high concentration of ammonia nitrogen in the biogas slurry and the insect damage caused by the hatching of residual eggs were the main factors that caused the slow growth of the other three batches of cultured Spirulina. The use of biological treatment technology to reduce the ammonia nitrogen content in biogas slurry and the use of membrane filtration technology to remove insect eggs in biogas slurry are very necessary to stably obtain high-yield spirulina.

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Original research done by Liu Xiao, Liu Rui, Guo Qingqing, Wang Genrong, Luo Jinfei, Chen Lujun

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