The Characterization And Composting Of The
Municipal Solid Waste Of Riyadh City,
Saudi Arabia
Author(s)
S. O. Mutairi, A. M. Ghoneim, A. S. Modaihsh, M. O. Mahjoub
& R. A. Abdel-Aziz
Abstract
The rapid increase in population and change in life style in Riyadh city, Saudi
Arabia have resulted in a dramatic increase in municipal solid waste (MSW)
which has recently reached 12,000 tons per day. Most of it (about 85%) is
disposed as land fill. The present study was initiated to address the problems of
MSW disposal and assess the feasibility of the composting of separated organic
matter of MSW generated in low, middle and high income districts of Riyadh
city. A complete characterization of MSW compost was conducted. Results
showed that the average recyclable materials in the three districts were more or
less similar. The average organic fraction in the three districts was about 52%.
The organic fraction had a number of coli form cells at the starting time of
composting which completely disappeared after 21 days from starting the
composting process. The composting of MSW resulted in a significant reduction
in the volume of municipal solid waste and finally produced earthy smelling soillike
material compost. The obtained mature compost contained high levels of the
different major elements; N (2.0%), P (0.5%) and K (0.25%). On the other hand,
levels of Cd, Cr and Pb were below the standard values suitable for compositing.
The pH and organic matter content of the mature compost were typically 7.70
and 33%, respectively. The C/N ratio showed high rates of change during the
first 60 days after composting, and then stabilized. In general, the obtained
results demonstrated the good quality of the produced compost, which can safely
be used for enhancing physical, chemical and biological soil properties.
Keywords: municipal solid waste, composting, Riyadh city, recycle.
Keywords
municipal solid waste, composting, Riyadh city, recycle.
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