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ID 24974
file
creator
Deevanhxay, Phengxay
Hasegawa, Takako
Okada, Mitsumasa
subject
Coagulant
Crypto-Tracer
Flocculation Performance
Sedimentation
Synthetic Cryptosporidium Oocyst
NDC
Chemical technology
abstract
The improvement of Cryptosporidium oocysts removals is an urgent need in drinking water treatment and one of the possible solutions is to use high-performance coagulant such as poly-silicate iron coagulant (PSI) instead of conventional coagulants like poly aluminum chloride (PAC). The efficiency of synthetic Cryptosporidium oocysts (S-Crypto) removal using PSI was evaluated by both jar tests and pilot plant experiments. The residual concentration of S-Crypto could be reduced even though the coagulation was operated under the optimum conditions for turbidity removal. The removal efficiencies of S-Crypto using PSI were up to 42-1073766880gher than those using PAC in the pilot plant. The higher performance of PSI is brought about by the presence of ferric species in the coagulant which promotes better sedimentation and not by the higher flocculation performance of the coagulant. In addition, the performance of PSI was independent of temperature, and S-Crypto removal by ferric chloride (FC) was not stable in cold raw water. It was suspected that the bound polymerized silica of PSI increases the stability of coagulation in cold water.
journal title
Journal of Chemical Engineering of Japan
volume
Volume 39
issue
Issue 2
start page
137
end page
143
date of issued
2006
publisher
The society of chemical engineers, Japan
issn
0021-9592
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2006 The society of chemical engineers, Japan
relation is version of URL
http://dx.doi.org//10.1252/jcej.39.137
department
Institute for Waste Waters Treatment
Graduate School of Engineering