Discussion of “Systems Analysis and Solid Waste Planning”

1974 ◽  
Vol 100 (6) ◽  
pp. 1290-1292
Author(s):  
Marlin U. Thomas
Keyword(s):  
Solid Waste ◽  
Systems Analysis

Systems Analysis and Solid Waste Planning

1974 ◽  
Vol 100 (1) ◽  
pp. 7-24
Author(s):  
Robert M. Clark ◽  
James I. Gillean
Keyword(s):  
Solid Waste ◽  
Systems Analysis

Sequential Batch Anaerobic Composting of the Organic Fraction of Municipal Solid Waste

1992 ◽  
Vol 25 (7) ◽  
pp. 327-339 ◽  
Author(s):  
D. P. Chynoweth ◽  
J. Owens ◽  
D. O'Keefe ◽  
J. F. K. Earle ◽  
G. Bosch ◽  
...  
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Systems Analysis ◽  
Land Application ◽  
Fermentation Products ◽  
Technical Performance ◽  
Energy Product ◽  
Volatile Solids ◽  
Leachate Management ◽  
Recycle Rate

When kept free of toxic components, the biodegradable fraction of municipal solid waste (MSW) may be decomposed by aerobic or anaerobic composting and the residues either disposed of by land application or marketed as compost. Anaerobic composting is more economic because it effects similar conversion, does not require mixing or aeration, and produces the valuable energy product methane. This paper describes technical performance and systems analysis of a novel sequential batch anaerobic composting (SEBAC) process for treatment of high solids wastes that employs leachate management to provide organisms, moisture, and nutrients required for rapid conversion of MSW and removal of inhibitory fermentation products during start-up. The results of 19 trials with this system operated at 55°C and total residence times of 21 or 42 days exhibited about 50% conversion of organic matter with a methane yield of 0.2 m3 kg−1 volatile solids. The process was reliable and stable. A systems analysis showed that tipping fees employing this process were in the $30 per ton range and that economics were highly sensitive to biodegradability of feedstock and residue use options; they were relatively insensitive to process kinetics and leachate recycle rate. This process can be applied to in-vessel or controlled landfill designs.

scholarly journals Systems analysis of municipal solid waste management and recycling system in east Africa: benchmarking performance in Kigali city, Rwanda

2019 ◽  
Vol 80 ◽  
pp. 03004
Author(s):  
Telesphore Kabera ◽  
Honorine Nishimwe
Keyword(s):  
Waste Management ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Systems Analysis ◽  
Solid Waste Management ◽  
Current Status ◽  
Municipal Solid Waste Management ◽  
Private Companies ◽  
Recycling System ◽  
The City

This study assessed the current status of solid waste management (SWM) in the City of Kigali (CoK), the capital city of Rwanda. This assessment was done using systems analysis methodology of “wasteaware” benchmark indicators for integrated sustainable waste management in cities. This method of assessing helps to assess the Municipal Solid Waste Management (MSWM) in a city according to its physical components and governance features. Data were collected during a 6-month period from May to October 2017, but verification took other four months (Up to February 2018). Data were obtained from official reports, legal documents, and interviews with key personnel and operators and also from official and unofficial dumpsites visits. In CoK, approximately 232,870 tons of MSW is generated per year, MSW collection and transportation is done by private companies but the only dumpsite present in Kigali is fully controlled by the City of Kigali. Residents pay waste collectors according to their social classes and their locations. There is no official recycling system; recycling activities are informally performed by private companies and some wastes, like plastic bottles, are taken to Uganda and Tanzania to be recycled. This study found that the recycling rate was 10% contrarily to the 2% which is recorded by official sources. This study has contributed by filling the gap in literature on waste management for the city of Kigali and it recommends that the Government represented by the CoK should do more in terms of investing in SWM and creating a relationship between private waste collectors and local communities, and the private sector should be mobilized to invest in SWM activities.

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