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A solid waste collection company is collecting all the residential solid waste generated by a city with a population of 45,000. The average solid waste generation rate is 1.55 kg/capita per day, and the average uncompacted density is 100 kg/m³. Waste will be collected once every three days, with no rear-of-house pickups. Collectors will work 8 hours per day, 7 days a week.

Determine how many trucks of what size the company should plan on using, using the following data:

- Average residential occupancy: 4 people per residence
- Maximum number of cans per stop: 2 at 0.0757 m³/can
- Side loader compactor truck with a crew of one
- Truck compactor density rating: 400 kg/m³
- Truck unloading time: 9 minutes
- Delay time: 0.5 hours
- Distance to disposal site: 20 km
- Average hauling speed: 45 km/h
- Number of trips to disposal site: 1 per day
- Time between pickup stops: 0.3 minutes
- Dump time (regression coefficient \( a_2 \)): 0.2 min/can
- Standard side loading compactor truck capacities (in m³): 9.0, 10.0, 12.0, 14.0, 15.0, 18.0
- Total break time: 30 minutes per day

Answer :

To determine the number and size of trucks needed for the solid waste collection, we can follow these steps:

1. Calculate the total solid waste generated per day:
- Population: 45,000
- Average waste generation rate: 1.55 kg/cap.d
- Average occupancy: 4/residence

Total waste generated per day = population * waste generation rate * occupancy
Total waste generated per day = 45,000 * 1.55 kg/cap.d * 4/residence

2. Calculate the volume of waste generated per day:
- Average uncompacted density: 100 kg/m3

Volume of waste generated per day = (total waste generated per day) / (average uncompacted density)
Volume of waste generated per day = (45,000 * 1.55 * 4) / 100 m3/day

3. Calculate the number of stops per day:
- Maximum number of cans per stop: 2 cans
- Can volume: 0.0757 m3/can

Number of stops per day = (volume of waste generated per day) / (maximum number of cans per stop * can volume)
Number of stops per day = [(45,000 * 1.55 * 4) / 100] / (2 * 0.0757)

4. Calculate the number of trucks needed:
- Truck capacity options: 9.0 m3, 10.0 m3, 12.0 m3, 14.0 m3, 15.0 m3, 18.0 m3

Number of trucks needed = (number of stops per day) / (number of stops truck can make in one trip)
Number of trucks needed = (number of stops per day) / (truck capacity)

Try different truck capacities and calculate the number of trucks needed for each capacity option. Choose the option that minimizes the number of trucks while ensuring all waste is collected.

By following these steps, you can determine how many trucks of what size the consulting company should plan on using.

To know more about number and size of trucks visit:

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