活性污泥系统中微型动物监测与指示生物的应用

Study on microfauna monitoring and application of bioindicator in activated sludge plant

在某炼油厂污水处理车间曝气池活性污泥系统中,通过微生物镜检监测出30多种原生和后生微型动物。实验研究发现,固着型纤毛虫的种数最多,出现频率也较高。对曝气池微型动物种群出现的相关性分析证实:小口钟虫和固着型纤毛虫可作为曝气池中混合液溶解氧浓度的指示生物,当小口钟虫密度达到1 440 ind./mL时,溶解氧质量浓度达到3.0 mg/L以上,固着型纤毛虫密度在250 ind./mL以下时,则曝气池混合液溶解氧质量浓度低于0.5 mg/L。草履虫和轮虫的多寡可判断水质净化的程度。自由游泳型纤毛虫数量多表明污泥的沉降性能较差,而大多数的钟虫等固着型纤毛虫的出现则是污泥沉降性能良好的指示生物。

Research was performed in the activated sludge system of waste water treatment plant in a petroleum refinery. The aim of this study was to investigate certain protozoan species that indicate certain conditions of an activated sludge plant. Among more than 30 species of protozoa, showing in the plant, stalked ciliares such as vorticella microstoma showed a largest population during the experiment period. Vorticella microstoma had a close correlation with DO in aeration pit. When the density of vorticella microstoma was 1 440 ind./mL, the conceutration of DO was over 3.0 mg/L. Rotifers can be indicator species of good quality of effluent water. Free-swimming ciliates demonstrated a good settlement performance of sludge.