Changes in microbial activities nutrient mineralization and heavy metal concentration in sewage sludge treated with PGPR

Radziah O., . and Nur Aizat A.R, . (2008) Changes in microbial activities nutrient mineralization and heavy metal concentration in sewage sludge treated with PGPR. [Proceedings Paper]

Recycling of sewage sludge to land offers an economically and environmentally sustainable option for its disposal. The properties of the sludge play a crucial role in determining the initial release and subsequent availability of nutrient in amended soils. A laboratory was conducted to determine the effect of PGPR on microbial activities and nutrient released in sewage sludge. Sewage sludge was inoculated with three bacterial isolates; Azospirillium Bacillus and Klebsiella spp. and a non-inoculated control. It was then incubated in a flask at room temperature for 3 months. At each sampling CO2 evolution microbial population heavy metal Pb Cd Cu and Znconcentration and nutrient release N and P were determined weekly. The result shows that the CO2 evolution from sludge treated with bacterial isolates decrease gradually throughout the incubation period. The declining pattern coincided with the increased bacterial and fungal population. AT the end of incubation the mineralizable nutrients C N and Pdecreased as they were fully utilized by the microorganisms. There was significant effect of Bacillus Azozpirllium and Klebsiella spp.on heavy metal concentrations in sewage sludge.

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Abstract

Recycling of sewage sludge to land offers an economically and environmentally sustainable option for its disposal. The properties of the sludge play a crucial role in determining the initial release and subsequent availability of nutrient in amended soils. A laboratory was conducted to determine the effect of PGPR on microbial activities and nutrient released in sewage sludge. Sewage sludge was inoculated with three bacterial isolates; Azospirillium Bacillus and Klebsiella spp. and a non-inoculated control. It was then incubated in a flask at room temperature for 3 months. At each sampling CO2 evolution microbial population heavy metal Pb Cd Cu and Znconcentration and nutrient release N and P were determined weekly. The result shows that the CO2 evolution from sludge treated with bacterial isolates decrease gradually throughout the incubation period. The declining pattern coincided with the increased bacterial and fungal population. AT the end of incubation the mineralizable nutrients C N and Pdecreased as they were fully utilized by the microorganisms. There was significant effect of Bacillus Azozpirllium and Klebsiella spp.on heavy metal concentrations in sewage sludge.

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Item Type:	Proceedings Paper
Additional Information:	Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. mal S590.2 S683 2008 Call Number
AGROVOC Term:	SEWAGE SLUDGE
AGROVOC Term:	FERMENTATION
AGROVOC Term:	NUTRIENT AVAILABILITY
AGROVOC Term:	CYCLING
AGROVOC Term:	MINERALIZATION
AGROVOC Term:	HEAVY METALS
AGROVOC Term:	RHIZOBACTERIA
AGROVOC Term:	MICROORGANISMS
Geographical Term:	MALAYSIA
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 05:13
URI:	http://webagris.upm.edu.my/id/eprint/11242

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