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Sewage treatment plant sludge: a source of potential microorganism for citric acid production

Jamal, Parveen and Alam, Md. Zahangir and Ramlan, M. and Salleh, M. and M. Akib, Munirah (2005) Sewage treatment plant sludge: a source of potential microorganism for citric acid production. American Journal of Applied Sciences, 2 (8). pp. 1236-1239. ISSN 1546-9239

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Abstract

This research emphasizes on the utilization of Sewage Treatment Plant (STP) sludge, which is an inexpensive and easily available raw material and a good source for growth of microorganisms because it has enough nutrients and trace elements. This can be considered as an alternative cost effective solution for waste management in addition to production of a value added product citric acid, one of the important chemicals used in various industrial processes. The isolation of filamentous fungi especially Aspergillus was done from STP sludge for better adaptability. Six strains of Aspergillus were isolated from STP sludge and identified using slide culture technique followed by image analysis. Four strains (SC906, A103, A2017 and A1020) were selected from lab stock. All strains were screened under controlled fermentation conditions such as pH range of 2-3, temperature 30°C and agitation 150 rpm, using 1% (w/w) of substrate (STP sludge), 2% (w/w) co-substrate (wheat flour) with inoculum’s size of 2% (spore mL‾1), using liquid state fermentation process for the maximum production of citric acid. Evaluation of fungal potentiality was done in terms of maximum citric acid production, biosolids production (TSS %) and chemical oxygen demand (COD) removal. Strain A-SS106 produced the highest concentration of citric acid (0.14 g L‾1), TSS (15.18 g L‾1) and COD removal (90.1%) on fourth day of fermentation.

Item Type: Article (Journal)
Additional Information: 2937/9730
Uncontrolled Keywords: Isolation, screening, fermentation, COD removal and liquid state bioconversion
Subjects: Q Science > QR Microbiology
T Technology > TA Engineering (General). Civil engineering (General) > TA164 Bioengineering
T Technology > TA Engineering (General). Civil engineering (General) > TA170 Environmental engineering
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: Prof.Dr. Parveen Jamal
Date Deposited: 19 Jul 2013 12:19
Last Modified: 19 Jul 2013 12:19
URI: http://irep.iium.edu.my/id/eprint/9730

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