Turbidity fluctuation as a measure of floc size in a coagulation pilot study
Resource
DESALINATION AND WATER TREATMENT, 30(1-3), 98-104
Journal
Desalination and Water Treatment
Pages
98-104
Date Issued
2011
Date
2011
Author(s)
Cheng, Wen Po
Chang, Jen Neng
Chen, Ping Hung
Yu, Ruey Fang
Huang, Yu Wei
Abstract
A nephlometric turbidimeter was coupled with a data acquisition unit for online measurement of turbidity fluctuation, called the Nephelometric turbidimeter monitoring system (NTMS). According to Poison-distribution theory, the turbidity Standard Deviation (SD) calculated from the data collected by an NTMS follows the computed value obtained from the "turbidity fluctuation technique". Hence, using SiO2 solution as test waters (10 NTU-1000 NTU), the experimental results reveal that it exists a good correlation between the turbidity SD and the square root of particle numbers (N1/2). Furthermore, the NTMS was applied in the operation of a 500 ml/min coagulation pilot plant. The pilot plant was operated with a range of coagulation pH values, coagulant doses and velocity gradients (G). Floc sizes were determined from digital images. The result shows that the standard deviation of the turbidity measurement (turbidity SD) was correlated with floc size under the various operating conditions. Therefore, turbidity SD can be utilized to determine the appropriate operation conditions including the coagulation pH, dose and velocity gradient. This newly developed technology may be used in water treatment plants in the near future. © 2011 Desalination Publications. All rights reserved.
SDGs
Type
journal article
File(s)![Thumbnail Image]()
Loading...
Name
index.html
Size
23.43 KB
Format
HTML
Checksum
(MD5):740b0b6774e61b390bc85b168a03ca66