title: [Effect of reaction conditions on the removal of pathogenic protozoan from secondary effluent in flocculation process].
abstract: Cryptosporidium and Giardia in reclaimed water are endangering the health of human beings by direct and indirect ways. Compared with traditional disinfection measures, flocculation, clarification and filtration can remove the pathogenic protozoan from wastewater more effectively. The factors affecting the removal of pathogenic protozoan from secondary effluent in flocculation process, including type and dosage of flocculant, pH, temperature and other reaction conditions were studied. The experimental results showed that the effectiveness of pathogenic protozoan removal appeared to be good at pH 6 - 8 and bad at low temperature. The effectiveness increased with the increase of ferric chloride dosage. Aluminium sulphate and poly aluminium chloride gave better performance in removal of pathogenic protozoan at the dosage of 70 mg/L and 20 mg/L respectively.
authors.affiliation: Environmental Simulation and Pollution Control State Key Joint Laboratory, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China. zt00@mails.tsinghua.edu.cn
authors.forename: Tong
authors.initials: T
authors.lastname: Zhang
authors.forename: Hong-Ying
authors.initials: HY
authors.lastname: Hu
authors.forename: Qian-Yuan
authors.initials: QY
authors.lastname: Wu
authors.forename: Zu-Sheng
authors.initials: ZS
authors.lastname: Zong
mesh_terms: D000534:Alum Compounds / Q000737:chemistry; D000077410:Aluminum Chloride; D017607:Aluminum Compounds / Q000737:chemistry; D000818:Animals; D002712:Chlorides / Q000737:chemistry; D003458:Cryptosporidium / Q000302:isolation & purification*; D005290:Ferric Compounds / Q000737:chemistry; D005427:Flocculation; D005872:Giardia / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D014867:Water / Q000469:parasitology*; D018508:Water Purification / Q000379:methods*
chemical_list: D000534:Alum Compounds; D017607:Aluminum Compounds; D002712:Chlorides; D005290:Ferric Compounds; D014867:Water; C041524:aluminum sulfate; D000077410:Aluminum Chloride; C024555:ferric chloride