%0 Journal Article
	%A K. V. Kalinichenko and  G. N. Nikovskaya
	%D 2014
	%J International Journal of Environmental and Ecological Engineering
	%B World Academy of Science, Engineering and Technology
	%I Open Science Index 85, 2014
	%T Principles of Municipal Sewage Sludge  Bioconversion into Biomineral Fertilizer
	%U https://publications.waset.org/pdf/9997018
	%V 85
	%X The efficiency of heavy metals removal from sewage 
sludge in bioleaching processes with heterotrophic, chemoautotrophic 
(sulphur-oxidizing) sludge cenoses and chemical leaching (in 
distilled water, weakly acidic or alkaline medium) was compared. 
The efficacy of heavy metals removal from sewage sludge varies 
from 83 % (Zn) up to 14 % (Cr) and follows the order: Zn > Mn > Cu 
> Ni > Co > Pb > Cr. The advantages of metals bioleaching process 
at heterotrophic metabolism were shown. A new process for 
bioconversation of sewage sludge into fertilizer at middle 
temperatures after partial heavy metals removal was developed. This 
process is based on enhancing vital ability of heterotrophic 
microorganisms by adding easily metabolized nutrients and synthesis 
of metabolites by growing sludge cenoses. These metabolites possess 
the properties of heavy metals extractants and flocculants which 
provide the enhancement of sludge flocks sedimentation. The process 
results in biomineral fertilizer of prolonged action with immobilized 
sludge bioelements. The fertilizer satisfies the EU limits for the 
sewage sludge of agricultural utilization. High efficiency of the 
biomineral fertilizer obtained has been demonstrated in vegetation 
experiments.

 

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