THE COMBINED USE OF VALUE-FOCUSED THINKING AND THOR 2 TO CHOOSE A BIODIGESTER IN A BRAZILIAN PUBLIC UNIVERSITY

Souza, L. O. G. R.; Santos, M.; Gomes, C. F. S.; Quelhas, O. L. G.; Barud, N. A.

doi:10.1590/0101-7438.2023.043.00268084

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ARTICLES • Pesqui. Oper. 43 • 2023 • https://doi.org/10.1590/0101-7438.2023.043.00268084 copy

THE COMBINED USE OF VALUE-FOCUSED THINKING AND THOR 2 TO CHOOSE A BIODIGESTER IN A BRAZILIAN PUBLIC UNIVERSITY

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

There are liabilities for society because of the increase in the amount of waste. This work will choose a biodigester to treat organic waste at Universidade Federal Fluminense. For this, the VFT approach was used to structure the problem and the multicriteria decision support method THOR 2 was used to choose the option that has the most excellent preference considering three scenarios. The experts say that six criteria can be used to choose a biodigester, namely Capacity, Input of organic matter, Input of water, Average expected production of biogas and average output of biofertilizer. The research showed that biodigester 7 had the best performance as a result. The relevance of the study refers to the contribution to the reduction of organic solid waste in the environment. This research applies THOR 2 method in a new context.

Keywords:
Circular Economy; VFT; THOR 2

Nº	Techniques	Possible questions
1º	Elaborate on a Wish List	What do you want? What do you value?
2º	Identify Alternatives	What would be a perfect alternative, a terrible and a reasonable one? What is good or bad about each one of them?
3º	Identifying problems and weaknesses	What's right and wrong about the organization?
3º	Identifying problems and weaknesses	What needs to be fixed?
4º	Predict consequences	What happened that was good and bad?
4º	Predict consequences	What is your concern about what might happen?
5º	Check goals, restrictions, and directions	What are your aspirations?
5º	Check goals, restrictions, and directions	What limitations are placed on you?
6º	Evaluate multiple perspectives	What are your aspirations?
6º	Evaluate multiple perspectives	What limitations are placed on you?
7º	Define strategic objectives	What are your ultimate goals?
7º	Define strategic objectives	What are your core values?
8º	Establish generic goals	What goals do you have for your customers, employees, shareholders, and yourself?
8º	Establish generic goals	What environmental, social, economic, health, and safety objectives are important?
9º	Finding structural goals	Follow means-ends: why is this goal important and how can you reach it?
9º	Finding structural goals	Specify: what do you mean by this objective?
10º	Measure goals	How do you assess the achievement of this objective?
10º	Measure goals	Why is goal A more important than goal B?

Criteria	Measures	Unit	Goal
Capacity	The total volume that the biodigester holds	L	↑
Organic matter input	The total amount of organic matter that the biodigester can process per batch	kg	↑
Water input	The total amount of water needed by the biodigester to process organic matter	L	↓
Average expected biogas production	The average daily amount of biogas generated by the biodigester from the decomposition of the amount of organic matter supported by its capacity	m3 /day	↑
Average biofertilizer production	The average monthly amount of biofertilizer generated by the biodigester from the decomposition of the amount of organic matter supported by its capacity	L/month	↑
Price	Biodigester acquisition cost	R$	↓

Biodigester	Criteria
Biodigester	Capacity	Organic matter input	Water input	Average expected biogas production	Average biofertilizer production	Price
1	10,000	150	150	5	113	8,950
2	10,000	150	150	5	113	5,900
3	5,000	75	75	2.5	4,500	6,850
4	5,000	75	75	2.5	4,500	3,800
5	5,000	75	75	1.5	3,500	2,779
6	7,500	113	113	2.25	5,250	3,223
7	10,000	150	150	3	7,000	3,644

Criteria	Capacity	Organic matter input	Water input	Average expected biogas production	Average biofertilizer production	Price
Weight	8	8	5	7	6	5
P	2,500	50	50	1	500	1,000
Q	1,000	30	30	0.5	200	500
D	20,000	300	300	12	10,000	15,000

Position	S₁	S₂	S₃
1ª	Biodigester 1 - 4.038	Biodigester 7 - 4.511	Biodigester 1 - 5.173
2ª	Biodigester 7 - 3.951	Biodigester 1 - 4.384	Biodigester 7 - 5.017
3ª	Biodigester 2 - 3.91	Biodigester 2 - 4.256	Biodigester 2 - 4.818
4ª	Biodigester 6 - 3.0	Biodigester 6 - 2.454	Biodigester 6 - 2.718
5ª	Biodigesters 3,4,5 - 1.5	Biodigesters 3, 4 - 1.132	Biodigester 3 - 2.0
6ª		Biodigester - 0.0	Biodigester 4 - 1.773
7ª			Biodigester 5 - 0.0

Position	S₁	S₂	S₃
1ª	Biodigester 7 - 3,685	Biodigester 7 - 3,993	Biodigester 7 - 4,861
2ª	Biodigester 2 - 3,274	Biodigester 2 - 3,483	Biodigester 2 - 4,097
3ª	Biodigester 1 - 3,27	Biodigester 1 - 3,357	Biodigester 1 - 3,744
4ª	Biodigester 6 - 3,101	Biodigester 6 - 2,347	Biodigester 6 - 2,657
5ª	Biodigesters 4 e 5 - 1,5	Biodigesters 3, 4, 5 - 1	Biodigester 4 - 1,825
6ª	Biodigester 3 - 1,0		Biodigester 3 - 1,598
7ª			Biodigester 5 - 1,088

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↓	Cost monotonic - the lower the value, the better.
↑	Profit Monotone - The higher the value, the better.