Advanced Water Management Centre

AWMC Seminar Program: Sludge deep-dewatering with chemical reagent pretreatment

Abstract: Activated sludge is a by-product in wastewater treatment plant (WWTP). Deep-dewatering of raw sludge (RS) could reduce sludge volume, and further save the costs for the subsequent transportation and disposal. However, some pretreatments are indispensable for deep-dewatering of sludge to destruct the colloid structure of extracellular polymeric substances (EPS) in sludge flocs, and reduce the bound water content. Fenton’s reagent is used for the degradation of EPS to enhance sludge dewaterability. Sludge samples of different volatile solids (VS) contents were used to derive optimal dosages of Fenton's reagent. The optimal dosages of the oxidation reagents based on VS contents were proved to be consistent and effective for different sewage sludge with different organic matter contents from different wastewater treatment plants (WWTPs). Fenton’s oxidation can be regarded as “extracellular oxidation”, which is beneficial to sludge deep-dewatering. In contrast, ferrous iron activate Ca(ClO)2 in sludge pretreatment can be regarded as “intracellular oxidation”. Cell lysis in sludge pretreatment worsen dewaterability. A full-scale project of sludge deep dewatering by using oxidation reagent achieves stable continuous production in an industrialized WWTP (Daily production of 20 t sludge cake with 55% water content) in Shenzhen, China.


AWMC hosts a free seminar every Friday from 9am.

Event Details
Date & Time: 
Friday, 15 November 2019
9am - 10am
Venue: 76-228 Molecular science Building
  • Wenbo Yu (Visiting Academic, AWMC)

Event Contact: