1 CHAPTER 3 3.1 Quantification of waste Quantities of Municipal Solid Waste • The quan tities of MSW generate d in a community may be estimated by one of t hree techniques: input analysis, secondary data analysis, or output analysis. number of products. • For example, if 100,000 cans of soft drinks are sold each week in a particular community, the MSW, including litter , can be expected to include 100,000 . • The estimation techniques is highly inaccurate except in small and isolated communities.
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0.0002L + 44.7,• Where W = wasted generated (tons), S = number of
s ops ma e y e p c up ruc , = num er ofamilies served, D = number of single familydwellings, P = population, and L = adjusted incomeper dwelling unit (dollars)
Quantities of Municipal Solid Waste• Models like this one are inherently inaccurate and
may have no general application.• When possible, solid waste generation should be
, ,refuse dumped at the disposal site, either with truckscales or with portable wheeled scales.
• Daily weight of refuse varies with the day of theweek and the week of the year.
• ea er con ons a so a ec re use we g , s ncemoisture content can vary between 15 to 30%.
Quantities of Municipal Solid Waste• The total waste tonnage can be estimated with the
following equation:• W = T (w/t)• W ere W = t e tota we g t o t e waste e vere to
the facility, T = the total number of trucks thatdelivered waste to the facility, w = the total weight ofthe trucks that were weighed and t = the number oftrucks that were weighed.
•s approac s su e o a ac y a rece ves afairly constant flow of trucks.
Quantities of Municipal Solid Waste• Unfortunately, the rate at which trucks arrive at most
facilities fluctuates during the operating day.• A weighing crew targeting every n th truck will miss
trucks during the busy parts of the day and be idle at.
• Missing trucks during the busy parts of the day canbias the results; the trucks that arrive at these timestend to be curbside collection trucks, which have adistinctive range of weights.
• Also, having a crew and its equipment stand idle atth
reduces the amount of data collected, which reducesthe statistical value of the overall results.