Document Detail

Effect of alkaline pretreatment on anaerobic digestion of solid wastes.
MedLine Citation:
PMID:  18068345     Owner:  NLM     Status:  MEDLINE    
The introduction of the anaerobic digestion for the treatment of the organic fraction of municipal solid waste (OFMSW) is currently of special interest. The main difficulty in the treatment of this waste fraction is its biotransformation, due to the complexity of organic material. Therefore, the first step must be its physical, chemical and biological pretreatment for breaking complex molecules into simple monomers, to increase solubilization of organic material and improve the efficiency of the anaerobic treatment in the second step. This paper describes chemical pretreatment based on lime addition (Ca(OH)2), in order to enhance chemical oxygen demand (COD) solubilization, followed by anaerobic digestion of the OFMSW. Laboratory-scale experiments were carried out in completely mixed reactors, 1 L capacity. Optimal conditions for COD solubilization in the first step of pretreatment were 62.0 mEq Ca(OH)2/L for 6.0 h. Under these conditions, 11.5% of the COD was solubilized. The anaerobic digestion efficiency of the OFMSW, with and without pretreatment, was evaluated. The highest methane yield under anaerobic digestion of the pretreated waste was 0.15 m3CH4/kg volatile solids (VS), 172.0% of the control. Under that condition the soluble COD and VS removal were 93.0% and 94.0%, respectively. The results have shown that chemical pretreatment with lime, followed by anaerobic digestion, provides the best results for stabilizing the OFMSW.
M López Torres; Ma del C Espinosa Lloréns
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Publication Detail:
Type:  Journal Article     Date:  2007-12-18
Journal Detail:
Title:  Waste management (New York, N.Y.)     Volume:  28     ISSN:  0956-053X     ISO Abbreviation:  Waste Manag     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-09-04     Completed Date:  2009-02-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9884362     Medline TA:  Waste Manag     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2229-34     Citation Subset:  IM    
National Center for Scientific Researcher (CNIC), Environmental Pollution Department (DECA), Ave. 25 y 158, Cubanacan, Playa, Havana City, Cuba.
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MeSH Terms
Analysis of Variance
Calcium Hydroxide
Hydrogen-Ion Concentration
Methane / analysis
Organic Chemicals / analysis
Refuse Disposal / methods*
Urban Population
Reg. No./Substance:
0/Organic Chemicals; 1305-62-0/Calcium Hydroxide; 74-82-8/Methane

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