A Review on the Physical Dewatering Methods of Sludge Pretreatment in Recent Ten Years

Abstract

Due to the increasingly tight land resources and the increasingly intensified ecological environment of pollution, sludge treatment has become an important subject of environmental protection research, among which sludge dewatering is the primary link of sludge treatment. Many researchers have used physical methods to improve the dewatering performance of sludge. Through the distribution of sludge water, this paper analyzes the influence of several important factors of sludge dewatering, and expounds several methods for sludge dewatering pretreatment such as electrolysis, freezing and thawing method, ultrasonic method and activated carbon adsorption method and corresponding dehydration mechanism such as change the sludge particle size, increase the sludge water channel, shatter extracellular polymers and change the charge distribution of sludge.