Influence of NaOH and thermal pretreatment on dewatered activated sludge solubilisation and subsequent anaerobic digestion: Focused on high-solid state.

Abstract:

:In this study, the influence of NaOH and thermal pretreatment of dewatered activated sludge (DAS) on the high-solid solubilisation and anaerobic digestion was separately investigated by monitoring common parameters. The results indicated that COD, proteins and carbohydrates were efficiently solubilised in both NaOH and thermal pretreated DAS samples. For NaOH pretreatment, the concentrations of volatile fatty acids (VFAs) and total ammonium nitrogen (TAN) firstly increased followed by decreasing with NaOH dose increasing. However, they decreased with the severity of thermal pretreatment. During the batch digestion experiments (at 37°C), for 80mg NaOHg(-1) total solid (TS) DAS pretreatment it resulted in a 6.99% decrease in cumulative methane yield (CMY) compared to untreated DAS. While for 80, 100, 120°C and 20mg NaOH pretreatment, CMY increased by 15%, 42%, 71% and 35%, respectively, in comparison to untreated DAS.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Zhang S,Guo H,Du L,Liang J,Lu X,Li N,Zhang K

doi

10.1016/j.biortech.2015.02.050

subject

Has Abstract

pub_date

2015-06-01 00:00:00

pages

171-7

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(15)00229-1

journal_volume

185

pub_type

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