Scribd
Upload
11 views3 pages

Exercise Collection

The document outlines an exercise in solid waste management focused on calculating waste generation in a city based on incomplete data from 2019. It includes tasks to determine waste amounts by district and type, as well as a comparison of current waste collection methods versus proposed decentralized systems. Additionally, it discusses cost implications and other factors influencing the choice of waste management systems.

Uploaded by

Joker
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
11 views3 pages

Exercise Collection

The document outlines an exercise in solid waste management focused on calculating waste generation in a city based on incomplete data from 2019. It includes tasks to determine waste amounts by district and type, as well as a comparison of current waste collection methods versus proposed decentralized systems. Additionally, it discusses cost implications and other factors influencing the choice of waste management systems.

Uploaded by

Joker
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 3

Course: Solid waste management

Exercise: Collection of waste


1) Calculate the waste generation of a City

The City wants to improve their waste management system and hired you to calculate the amounts of waste
the city is generating. Unfortunately, only data on a fraction of the waste generated in 2019 has been
collected and therefore the data set is incomplete (Table 1).
Luckily the income levels are listed in the data set (Figure 1) as below. Based on the Global Waste
Management Outlook (Figure 2) the percentage of the waste´s composition can be allocated to the income
levels.

From this, derive the amount of waste that is generated in the year 2019. Answer the following questions:
1. How much waste is generated by each district?
2. How much waste is generated for each waste type?
3. How much waste is generated in total?
4. Which district generates the most waste?

Others (incl.
District Income Level Organics Paper Plastics Glass Metals
textiles)
[%] [t] [%] [t] [%] [t] [%] [t] [%] [t] [%] [t]
1 High 545,15
2 Upper-middle 365,23
3 High 4.361,24
4 Low 84,17
5 Low 76,54
6 Low 40,08
7 Lower-middle 1.255,46
8 Lower-middle 213,65
9 Upper-middle 6.490,56
Total [t]

Seite: 1/3
Course: Solid waste management

Figure 1: Outline of the districts. Source: Kim et. Al (2005) - Waste collection vehicle routing problem with time windows.

District 1 (round black) and 3 (triangle brown) are high income districts.
District 2 (round blue) and 9 (round-dot purple) are upper-middle income districts.
District 7 (round grey) and 8 (square black) are lower-middle income districts.
District 4 (triangle yellow), 5 (square red) and 6 (square grey) and are low income districts.

Figure 2: Waste generation by different income levels. Source: UNEP (2015) – Global Waste Management Outlook.

Seite: 2/3
Course: Solid waste management

2) Comparison of two collection systems

Currently, all waste of the city is disposed of together with the residual waste and then will be dumped at a
landfill. Costs of 15 US $ per ton for dumping at the landfill and 35 US $ for collection and transfer are
incurred. (Source: Kaza, Yao et al (2018) – What a waste 2.0)
Therefore, the city wants to implement five decentralized collection containers each for paper, glass and
textiles all over the city. Organic waste shall be collected weekly by a garbage truck.
Composting the organic waste costs 32 US $ per ton. Preparation for reuse of paper, glass and textiles costs 35
US $ per ton each. Collecting the organic waste costs 28 US $ per ton and collecting paper, glass and textiles
costs 22 US $ each. (Source: UNEP (2015) – Global waste management Outlook.)

1. Which scenario of collecting the waste is more cost efficient?

2. Which aspects besides costs are also relevant for choosing the system?

Seite: 3/3

You might also like