1) The initial volume of mass of MSW is 20m3 and after compaction the volume is reduced to 4m3. What is the percent volume reduction and the compaction ratio? If it is desired to increase the volume reduction to 95% what would the compaction ration be?

2) The minimum waste compaction ration reported by the manufacturer of a high pressure compaction machine is 8:1. What is the corresponding percent volume reduction of the waste? What was the un-compacted volume of a 2.5m3 bale?

3) A community of 20,000 people generated MSW at rate of 2 3) A community of 20,000 people generated MSW at rate of 2.1 kg per capita per day. The compacted unit mass of the MSW in the collection truck is 300kg/m3. If the capacity of a collection truck is 12m3 how many truck loads of MSW, on average will be unloaded at the landfill each day?

Moisture content moisture content of solid waste usually is expressed in one of two ways In the wet-weight method of measurement. The moisture in a sample is expressed as a percentage of the wet weight of the material, in the dry-weight method, it is expressed as a percentage of the dry weight of the material

In the equation form, the wet-weight moisture content is expressed as The wet-weight method is used most commonly in the field of solid waste management In the equation form, the wet-weight moisture content is expressed as Moisture content (%) = (a-b) * 100 a where, a = initial mass of sample as delivered b = mass of sample after drying

Typical data on moisture content Component Moisture (%) Range Typical Food wastes 50-80 70 Paper 4-10 6 Cardboard 4-8 5 Plastics 1-4 2 Textile 6-15 10 Rubber Leather 8-12 Garden trimmings 30-80 60 Wood 15-40 20 Misc. organics 10-60 25 Glass Tin cans 2-4 3 Non ferrous metals Ferrous metals 2-6 Dirt, ashes, brick 6-12 8 MSW (noncomp.)

Example 1: estimate the moisture content of a solid waste sample with the following composition Components Percent by mass Food wastes 15 Paper 45 Cardboard 10 Plastics Yard wastes Wood 5 Tin cans

Solution 15 45 10 5 Component Percent by mass Moisture content (%) Dry mass, (kg) Food wastes 15 Paper 45 Cardboard 10 Plastics Yard wastes Wood 5 Tin cans Total 100

Solution Component Percent by mass Moisture content (%) Dry mass, (kg) Food wastes 15 70 4.5 Paper 45 6 42.3 Cardboard 10 5 9.5 Plastics 2 9.8 Yard wastes 60 4.0 Wood 20 Tin cans 3 4.9 Total 100 79 Based on 100kg waste

Therefore, moisture content = 100 – 79 x 100 100 = 21% Determine the moisture content using the equation Therefore, moisture content = 100 – 79 x 100 100 = 21%