Enhancement in mesophilic aerobic digestion of waste activated sludge by chemically assisted thermal pretreatment method.

Abstract:

:The effects of hybrid microwave (MW)-alkali pretreatment methods on the efficiency of mesophilic aerobic digestion were studied. The MW-alkali pretreatment (95°C-pH 12) was observed to enhance the sludge solubilization synergistically from 0.5% (raw) to 52.5% (MW-NaOH) and 48.7% (MW-KOH), which are 20% greater than the additive value of MW only and alkali only (16%(MW)+28.4%(NaOH)=44.4% and 16%(MW)+25.5(KOH)=41.5). The higher VSS solubilization was observed for hybrid MW-NaOH (53.9%) and MW-KOH (47.4%) methods. The batch mesophilic (35°C) aerobic digestion system led to 81.1% TCOD degradation and 72.4% VSS degradation at 20 days of retention time, with 35% higher TCOD and VSS reduction in comparison with the control system. The filterability of microwave-alkali pretreated sludge was improved remarkably after aerobic digestion. Moreover, the proposed method is capable of effectively sanitize the sewage sludge and produce Class A biosolids.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Tyagi VK,Lo SL

doi

10.1016/j.biortech.2012.05.134

subject

Has Abstract

pub_date

2012-09-01 00:00:00

pages

105-13

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(12)00898-X

journal_volume

119

pub_type

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