a case study of municipal solid waste management in the ... - lumes

Page 26incineratingplantFigure 8. Causa. Loop Diagram of Incinerating & LandfiIIIn this process, the municipal solid waste should be separated into non-combustibleand combustible parts either at source or by machines. Correspondingly, theinvestment of sorting is needed. The non-combustible part is treated in sanitarylandfill and the combustible part is plit into incinerator.Correspondingly, this causal loop diagram consisted of two parts: left and right. Onthe left hand part is similar to single sanitary landfi11. The difference is the loss ofpotential energy and its potential economic value can be partly avoided by energyrecovery. And since the combustible waste is incinerated instead of landfill, theamount of waste for sanitary landfill is less compared to the first approach's. Ofcourse, the investment of sanitary landfill is also less than the single sanitary landfillor under the same investment in sanitary landfill construction, operation and cappinghut with longer full filling up time.On the right hand part shows us the incinerating and energy recover. The loopconsisting of urban population & economic growth, municipal solid waste generated,investment of sorting, combustible waste, incinerator & electricity generator and airpollution, is revealed the new secondary pollution problem due to the emission oforganic pollutants during incinerating process. This might finally result in thenegative effects on urban population & economic growth, so this is balancing loop.The economic benefits from selling e1ectricity is the first positive effect which isdiscussed. The loop consisting of urban population & economic growth, municipal