[Removal characteristic of pathogenic protozoan in wastewater treatment and reclamation process]
Tong Zhang1, Hong-Ying Hu, Zu-Sheng Zong
1Environmental Simulation and Pollution Control State Key Joint Laboratory, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
Abstract:
The concentration of pathogenic protozoan (Cryptosporidium and Giardia) in water samples of different units in a full-scale wastewater treatment plant in Beijing was investigated periodically. The average concentrations of Cryptosporidium detected in untreated wastewater, primary sedimentation, secondary sedimentation, flocculation-sedimentation and sand-filtration effluent were 238, 179, 6, 1, 0.3 oocysts/L respectively, and the average concentrations of Giardia were 1568, 1048, 22, 4, 0.6 cysts/L respectively. The total removal efficiencies of Cryptosporidium and Giardia in this treatment process were 2.98 and 3.46 log respectively. Very little protozoan in wastewater could be removed by preliminary treatment process, the removal efficiencies were only 0.13 and 0.18 log respectively. Biological treatment unit had the highest removal efficiency, up to 1.50 and 1.67 log respectively. Advanced treatment process could enhance the removal of the protozoan effectively. The results also showed that the pollution level of pathogenic protozoan in the influent of wastewater treatment and reclamation plant was various according to the climate, high in dry seasons and low in rainy season.
More Related Videos
09:49Use of a Battery of Chemical and Ecotoxicological Methods for the Assessment of the Efficacy of Wastewater Treatment Processes to Remove Estrogenic Potency
Published on: September 11, 2016
06:35Implementation of a Hyperbolic Vortex Plasma Reactor for the Removal of Micropollutants in Water
Published on: July 25, 2025
Related Concept Videos
Biological Treatment of Effluent and Waste Water
Microbial Wastewater Treatment
Overview of Protists
Microbial Bioremediation of Pesticides
Diversity of Protists I
Coagulation
