Study on Purification Treatment of Anaerobic Digested Slurry by Means of Planting Economic Algae

摘要

A few of algae including Chlorella and Oscillatoria etc. were applied. The anaerobic digested slurry from pig waste was treated through two processes as algae-floating and algae-fixing. The result showed that Via 15 days of static treatment, floating algae reduced NH_3-N by 93.9%, TP by 78.4%, the color by 51.4%, while the surface removing effect to COD was not apparent; The fixing algae process was outside dynamic and divided into three stages. At the second stage, COD was removed by 8.3%, NH_3-N by 79.1%; At the third stage, COD was removed by 41.9%, NH_3-N by 68.5%, TP by 85.4%, the color by 84.4%; Comparing two processes, we could see that the purification effect of fixing algae process to anaerobic digested slurry from pig waste was apparently better than that of floating algae. Besides, during the purification, a large quantity of mixed algae could be produced. It could be used as the additive of green animal feed for various economic animals, increasing the quality and quantity of animals.