生物砂滤网工艺挂膜实验研究

研究了生物砂滤网污水处理工艺的循环挂膜过程,综合考察了滤网M01和M02上表面生物膜的生长变化情况,细菌数量及其微型动物的组成演化。同时在挂膜一定时间后投加生活污水,分别考察了滤网M01和M02对COD、NH₃-N的去除率。通过试验发现微生物能在滤料上生长繁殖,形成生物砂滤网。细菌在整个过程中占主导地位。同时其它微生物的种类也较为丰富,累枝虫、钟虫、聚缩虫等固着类纤毛虫数量较多,而且还出现了轮虫、线虫等微型后生动物,系统中真核微生物呈现多样化的趋势。滤网M01挂膜成熟后CODcr的去除率可高达90%,氨氮的去除率在70%左右,M02的CODcr平均去除率在60%左右,氨氮去除率在20%左右。

Experimental study on biological types during the process of biofilm colonization of biological sand filtration sewage treatment technology

In this experiment,the method of biofilm colonization on sand filtration(M01 and M02)sewage treatment was studied.It is showed the regular change of biofilm development under different conditions,the increment of bacteria number,the success of micro-animal kinds and population etc in the process.The rate of removal of CODcr、NH₃-N is observed.The experimental result shows biofilms can be cultivated on the surface of the biological sand filtration,and bacteria played a key role in this process.Epistylis,Vorticella,Zoothamnium,Rataria,Nemato and other microorgnisms can also be found in the system.The degradation of COD and NH₃-N on M01 can reach 90% and 70% respectively,The degradation of COD and NH₃-N on M02 can reach 60% and 20% respectively.