الفهرس 
Composition of Municipal Solid Waste
Experimental WorkOnly 14 pages are availabe for public view
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Abstract
The objective of this study is to study and compare the effect of sludge
addition on the enhancement of municipal solid waste (MSW)
biodegradation and leachate characteristics in conventional and bioreactor
landfills. Two groups of reactors, each consisting of three cells were used
to conduct this study. Three reactors simulating the bioreactor landfill
(Group-B) operated under anaerobic conditions with leachate
recirculation. Group-A reactors operated as sanitary landfills under
similar conditions without leachate recirculation. The first reactor of each
group served as a control reactor, being loaded only with MSW, while
12.5% and 25% (w/w) waste activated sludge was added to the other two
reactors in each group, respectively.
in all reactors, pH, chemical oxygen demand (COD), biological oxygen
demand (BOD), total solids (TS), total volatile solids (TVS)
concentrations in the leachate as well as the total amount of gas produced
were regularly monitored. The initial COD values for the three reactors of
group A were 32000, 21500 and 20500 mg/I, respectively. While those
for Group-B reactors were 32000, 28000 and 29000 mg/1, respectively.
The overall COD reduction after 93 days of 17.02%,48.50% and 48.51 %
were recorded for Group-A reactors and 12.79%, 18.06% and 24.43%
were recorded for Group-B reactors. After 93 days, it was observed that
the pH, COD, BOD concentrations, and BODs/COD ratio in the leachate
were higher by 28.20% in the control reactor of each group compared to
the other two reactors. However, the reactor with the highest sludge
percentage of each group revealed a better leachate treatment and more
biogas produced. Total volume of biogas produced was 65.45, 74.81 and
76.80 L for reactors (A-I), (A-2) & (A-3), respectively. On the other hand, total volume of gas produced was 92.86, 104.00 and 106.85 L for
reactors (B-1), (B-2) and (B-3), respectively. It was observed that sludge
addition application enhanced the rate of biodegradation of MSW as well
as the volume of sludge produced.