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Effects of ECP (exocellular polymers) Changes to the Dewaterability and Settlability of Wastewater Sludge Pretreated by Acid and Ultrasonic  

Hwang, Sun-Jin (경희대학교 환경.응용화학대학 및 환경연구센터)
Jeong, Kyu-Ho (경희대학교 환경.응용화학대학 및 환경연구센터)
Whang, Gye-Dae (경희대학교 환경.응용화학대학 및 환경연구센터)
Publication Information
Journal of Korean Society of Water and Wastewater / v.16, no.6, 2002 , pp. 733-740 More about this Journal
Abstract
The effects on dewaterability and settlability of wastewater sludge according to acid and ultrasonic pretreatment which was expected to change ECP (exocellular polymers) compounds in the sludge and bulk solution was investigated. Though ECP which attached to the sludge could stimulate coagulation of sludge particles by bridging effect, but ECP in the bulk solution deteriorated dewaterability and settlability of the sludge on the contrary. That is as the pH of the solution was decreased to 3 gradually by acid treatment, proportionally ECP in the bulk solution was attached to the sludge flocs and resulted in improvement of dewaterability and settlability of the sludge. In case of ultrasonic pretreatment, with proportional to the intensity and duration of ultrasonic application, ECP was detached and extracted from sludge flocs and these phenomena deteriorated dewaterability and settlability. Also because of the increasement of minute sludge particles according to ultrasonic, dewaterability became so much the worse.
Keywords
dewaterbility; wastewater sludge; pretreatment; ECP;
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