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The purification efficiency of the Hangu Stabilization Ponds and its relationship with biodiversity of protozoan community

XU Mu Qi 1,CAO Hong 1,WANG Yu Long 2 (1 Institute of Zoology,The Chinese Academy of Sciences,Beijing 10080,China;2 Hangu Environmental Monitoring Station,Tianjin 300480,China)  
The Hangu multiple cell stabilization ponds with the daily treatment capability of 50 000 tons of wastewater was constructed in 1993 and put into operation in 1995.Establishment of this system is important for controlling the red tide and improving water environment in the Bohai Sea.The investigations on the relationship between self purification efficiency and variation in biodiversity of protozoan community in various levels of ponds were carried out.The results indicated that the main pollutants were removed in high rate and that variations in protozoan community's structure and function were strongly related to water quality in ponds with different purification grade.Five sampling stations from the input pond to the output pond were distinguishable in differences in species richness,individual abundance,diversity index and PFU colonizing rate during 1~3 day.In the first pond with the highest concentrations of COD,BOD,N and P the species richness,individual abundance and PFU colonization rate were zero.Water quality in the last pond was greatly improved and this situation could be reflected by dramatic increase in the species richness,the high PFU colonization rate and high diversity index d value,along with the reduction of pollutants.The number of protozoan species colonising on PFU after exposure of 1 to 3 days was found to give a clear comparative indications of the water quality at the five stations.
【Fund】: 国家自然科学基金重点资助项目 !( 3 973 0 0 70 ) ;; 中国科学院“九五”重点资助项目! ( 6-1 52 1 1 1 -0 6)
【CateGory Index】: X17
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