Sludge conditioning using the composite of a bioflocculant and PAC for enhancement in dewaterability

Junyuan Guo; Cheng Chen

doi:10.1016/j.chemosphere.2017.06.111

Sludge conditioning using the composite of a bioflocculant and PAC for enhancement in dewaterability

Chemosphere. 2017 Oct:185:277-283. doi: 10.1016/j.chemosphere.2017.06.111. Epub 2017 Jun 27.

Authors

Junyuan Guo¹, Cheng Chen²

Affiliations

¹ College of Resources and Environment, Chengdu University of Information Technology, Chengdu, Sichuan, 610225, China. Electronic address: gjy@cuit.edu.cn.
² College of Resources and Environment, Chengdu University of Information Technology, Chengdu, Sichuan, 610225, China.

PMID: 28700956
DOI: 10.1016/j.chemosphere.2017.06.111

Abstract

This study investigated the production of a bioflocculant by using rice stover and its potential in sludge dewatering. Production of the bioflocculant was positively associated with cell growth and highest value of 2.37 g L^-1 was obtained with main backbone of polysaccharides. The bioflocculant showed good performances in sludge dewatering, after conditioned by this bioflocculant, dry solids (DS) and specific resistance to filtration (SRF) of typical wastewater activated sludge reached 19.3% and 4.8 × 10¹² m kg^-1, respectively, which were much better than the ones obtained with chemical flocculants. Sludge dewatering was further improved when the bioflocculant and polyaluminum chloride (PAC) were used simultaneously, and the optimized conditioning process by the composite was bioflocculant of 10.5 g kg^-1, PAC of 19.4 g kg^-1, and pH of 8.1. Under this optimal condition, DS and SRF of the sludge appeared as 24.1% and 3.0 × 10¹² m kg^-1, respectively.

Keywords: Bioflocculant; Rice stover; Sludge dewatering.

MeSH terms

Aluminum Hydroxide / pharmacology
Desiccation / methods*
Filtration
Flocculation*
Hydrogen-Ion Concentration
Oryza / chemistry
Sewage / chemistry*
Wastewater

Substances

Sewage
Waste Water
aluminum oxychloride
Aluminum Hydroxide