ECONOMIC AND FINANCIAL VIABILITY OF DIGESTER USE IN CATTLE CONFINEMENT FOR BEEF

Montoro, Stela B.; Santos, David F. L.; Lucas, Jorge de

doi:10.1590/1809-4430-Eng.Agric.v37n2p353-365/2017

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Scientific Paper, Professional Teaching, Researching, Extension and Politics • Eng. agríc. 37 (02) • Mar-Apr 2017 • https://doi.org/10.1590/1809-4430-Eng.Agric.v37n2p353-365/2017 copy

ECONOMIC AND FINANCIAL VIABILITY OF DIGESTER USE IN CATTLE CONFINEMENT FOR BEEF

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

This research analyzes the economic and financial feasibility of implementing a biodigester for confinement of beef cattle on a farm located in the State of São Paulo, through the approach of discounted cash flow. The anaerobic digestion technology arouses interest, due to its advantages with the generation of electricity and the pollution reduction of water resources, soil and air, from the biogas and bio-fertilizer production, high value-added products to cattle raising. It was verified that the treatment system of cattle manure with biodigesters generate biogas and fertilizer as revenue, with free cash flows that enable a return on investment in 3.8 years and return an IRR 26.40% and an MIRR of 10.69%; all above than the minimum rate of attractiveness which confirmed the economic and financial viability of the investment.

KEYWORDS:
biogas; biofertilizer; cattle; discounted cash flow

Dimension of Biodigester	Daily load of 466,550L after dilution (1: 6)	Useful biodigester volume of 13,996.500L after HRT= 30	4 Biodigesters	3,500 m³
Biogas Potential	TS in daily load 2.93%	0.274m³/kg TSad	3.741.9m³ of biogas/day	7,519.45Kwh/day
Biofertilizer Potential	1.87% of DM in biofertilizer	2.81% of N	1.46% of P	2.68% of K
Biofertilizer Potential	1.87% of DM in biofertilizer	245.15kg of N/day	127.37kg of P /day	233.81kg of K /day

Production of biogas (m³.day⁻¹)	Hours of Operation (h)	Power of 2 generators (kW.h⁻¹)	Production of energy (kW. Year⁻¹)	Revenue from electricity (R$Year⁻¹)
3,741.90	17.82	422	2,744,800.00	686,149.43

	Nutrients (kg. Year⁻¹)	Fertilizer (kg. Year⁻¹)	Fertilizer Price (R$. Kg⁻¹)	Total
Ammonium sulfate (21% N)	89,482.68	447,413.40	0.75	335,560.05
Super Simple Phosphate (20% P2O5)	106,468.47	591,491.49	0.83	490,937.93
Potassium chloride (60% K2O)	102,411.49	170,685.82	1.24	211,650.42
Total				1,038,148.41

Motor Generator Set and Installation	Unit	Quantity	Unit cost (R$)	Sub-Total
Motor Generator Set	Unit	2	350,000.00	350,000.00
Electrical Installations	-	-	19,069.00	19,069.00
Shelter of the generator set (civil engineering s)	-	-	1,970.93	1,970.93
Total				721,039.93

Concrete of the Containment (civil engineering ) 4080 m³	Unit	Quantity	Unit Cost (R$)	Sub-total
Concrete FCK=25 MP	m³	4,080	312.70	1,275,816.00
Labor (5)	daily	100	180.00	135,000.00
Shipping	300 Km	80	1,500.00	120,000.00
Total				1,530,816.00

Biodigester (equipment)	Unit	Quantity	Sub-Total
Biodigesters	-	4	R$ 664,623.17
Excavation, piping, labor and civil engineering	-	-	R$ 443,017.75
Total			R$ 443,017.75

Annual Costs (R$)
Maintenance		Operation
Biodigester	R$ 83,231.16	Labor (2 employees)	R$ 32,595.84
2 Motor-Generator	R$ 111,084.67	IPEs	R$ 1,404.24
Total of Maintenance	R$ 194,315.82	Total of Operation	R$ 34,000.08

YEAR	Total Revenue	Net Revenue	Operational costs	Net income	Free Cash Flow	Discounted Cash Flow
0					-4,362,506.75	-4,362,506.75
1	1,149,532	1,110,217.90	228,315.90	881,902.00	881,902.00	834,344.37
2	1,72,298	1,684,983.84	228,315.90	1,456,667.94	1,456,667.94	1,303,798.83
3	1,724,298	1,684,983.84	228,315.90	1,456,667.94	1,456,667.94	1,233,489.91
4	1,724,298	1,684,983.84	228,315.90	1,456,667.94	1,456,667.94	1,166,972.47
5	1,724,298	1,684,983.84	561,240.53	1,123,743.31	1,123,743.31	851,710.85
6	1,724,298	1,684,983.84	228,315.90	1,456,667.94	1,456,667.94	1,044,505.28
7	1,724,298	1,684,983.84	228,315.90	1,456,667.94	1,456,667.94	988,179.07
8	1,724,298	1,684,983.84	228,315.90	1,456,667.94	1,456,667.94	934,890.32
9	1,724,298	1,684,983.84	228,315.90	1,456,667.94	1,456,667.94	884,475.23
10	1,724,298	1,684,983.84	925.086.23	759,897.62	759,897.62	436,521.07
NPV		5,316,380.64		IRR	26.40%

Associação Brasileira de Engenharia Agrícola SBEA - Associação Brasileira de Engenharia Agrícola, Departamento de Engenharia e Ciências Exatas FCAV/UNESP, Prof. Paulo Donato Castellane, km 5, 14884.900 | Jaboticabal - SP, Tel./Fax: +55 16 3209 7619 - Jaboticabal - SP - Brazil
E-mail: revistasbea@sbea.org.br

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[1] * Corresponding author. São Paulo State University (UNESP), School of Agricultural and Veterinarian Sciences/ Jaboticabal - SP, Brazil. E-mail: stelamontoro@hotmail.com