Changes in microbial activities, nutrient mineralization and heavy metal concentration in sewage sludge treated with PGPR
2008
Nur Aizat, A.R | Radziah, O. (eds), Putra Malaysia Univ. (UPM), 43400 UPM Serdang, Selangor (Malaysia). Faculty Agriculture. Dept. of Land Management. Lab. of Micribiology
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 activitiesand nutrient released in sewage slidge. Sewage sludge was inoculated with three bacterialisolates; Azospirillium, Nacillus and Klebsiella spp., and a non-inculated control. It was then incubated in a flask at room temperature for 3 months. At each sampling, CO2evolution microbial population, heavy metal (Pb,Cd,Cu and Zn)concentration andnutrient release (N and P) were determined weekly. The result shows that the CO2 evolution from sludge treated with bacterial isolates decrease gradually throughout theincubation period. The declining pattern coincided with the increased bacterial and fungal population. AT the en d of incubation, the mineralizable nutrients (C,N and P)decreased as they wew 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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