Enhanced settleability and dewaterability of fungal treated domestic wastewater sludge by liquid state bioconversion process

Alam, Md. Zahangir and Fakhru’l-Razi, Ahmadun (2003) Enhanced settleability and dewaterability of fungal treated domestic wastewater sludge by liquid state bioconversion process. Water Research, 37 (5). pp. 1118-1124. ISSN 0043-1354

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Abstract

A study was conducted to evaluate the settleability and dewaterability of fungal treated and untreated sludge using liquid state bioconversion process. The fungal mixed culture of Aspergillus niger and Penicillium corylophilum was used for fungal pretreatment of wastewater sludge. The fungal strains immobilized/entrapped on sludge particles with the formation of pellets and enhanced the separation process. The results presented in this study showed that the sludge particles (pellets) size of 2–5mm of diameter were formed with the microbial treatment of sludge after 2 days of fermentation that contained maximum 33.7% of total particles with 3–3.5mm of diameter. The settling rate (measured as total suspended solids (TSS) concentration, 130 mg/l) was faster in treated sludge than untreated sludge (TSS concentration, 440 mg/l) after 1 min of settling time. In 1 min of settling operation, 86.45% of TSS was settled in treated sludge while 4.35% of TSS settled in raw sludge. Lower turbidity was observed in treated sludge as compared to untreated sludge. The results to specific resistance to filtration (SRF) revealed that the fungal inoculumhad significant potentiality to reduce SRF by 99.8% and 98.7% for 1% w/w and 4% w/w of TSS sludge, respectively. The optimum fermentation period recorded was 3 days for 1% w/w sludge and 6 days for 4% w/w sludge, respectively, for dewaterability test.

Item Type:	Article (Journal)
Additional Information:	4157/5021
Uncontrolled Keywords:	Settleability; Dewaterability; Specific resistance to filtration (SRF); Domestic wastewater sludge; Fungal treatment;Aspergillus niger; Penicillium corylophilum
Subjects:	T Technology > TP Chemical technology T Technology > TP Chemical technology > TP248.13 Biotechnology
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Biotechnology Engineering
Depositing User:	Dr. Md. Zahangir Alam
Date Deposited:	17 Jul 2013 10:56
Last Modified:	17 Jul 2013 10:56
URI:	http://irep.iium.edu.my/id/eprint/5021

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