Anaerobic co-digestion of animal manure at different waste cooking oil concentrations

Sunada, Natália da Silva; Orrico, Ana Carolina Amorim; Orrico Junior, Marco Antonio Previdelli; Lucas Junior, Jorge de; Lopes, Walter Renato Teixeira; Schwingel, Alice Watte

doi:10.1590/0103-8478cr20170517

Acessibilidade / Reportar erro

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

RURAL ENGENEERING • Cienc. Rural 48 (7) • 2018 • https://doi.org/10.1590/0103-8478cr20170517 copy

Anaerobic co-digestion of animal manure at different waste cooking oil concentrations

Co-digestão anaeróbica de estrume animal em diferentes concentrações de óleo de descarte de cozinha

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

This study aimed to obtain the best dose of waste cooking oil inclusion for the co-digestion of substrates prepared with dairy cattle and swine manure in order to maximize solids reductions and biogas yield. Analyses of total solids (TS), volatile solids (VS), and neutral detergent fiber (NDF) were performed during the loading and unloading of digesters, while biogas yield was measured twice a week. The maximum reduction in VS (51.4%) was reached with the inclusion of up to 54.6g waste cooking oil.kg manure^-1. Maximum NDF degradation occurred with inclusions of up to 69.4g waste cooking oil.kg manure^-1. Inclusions of up to 64g of waste cooking oil.kg manure^-1 provided specific biogas yield of 291.4 and 251.0L biogas.kg VS^-1 added to substrates with swine and cattle manure, respectively. Adding oil at doses between 45.1 and 69.4g waste cooking oil kg manure^-1 to substrates composed of cattle or swine manure maximizes reductions of solids and fibrous constituents and enhances specific biogas yield. Furthermore, swine manure supports higher doses of waste cooking oil.

Key words:
digestion; biogas; energy recycling

Universidade Federal de Santa Maria Universidade Federal de Santa Maria, Centro de Ciências Rurais , 97105-900 Santa Maria RS Brazil , Tel.: +55 55 3220-8698 , Fax: +55 55 3220-8695 - Santa Maria - RS - Brazil
E-mail: cienciarural@mail.ufsm.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] E-mail: natysunada@hotmail.com. *Corresponding author.

-----------------------Parameter assessed-----------------------		--------------Regression model-------------	R²	P	CV
--------------------------------------------------------------------------------Swine------------------------------------------------------------------------------
----------------------------Effluent pH---------------------------		y = -0.0011x + 7.7432	0.8	<0.001	0.2
	TS (%)	y = -0.002x² + 0.1894x + 33.287	0.9	<0.001	2.3
Reduction	VS (%)	y = -0.0017x² + 0.1856x + 36.82	0.7	<0.001	2.5
	NDF (%)	y = -0.0021x² + 0.2914x + 37.39	0.8	<0.001	1.4
	L.biogas.kg TS added^-1	y = -0.0157x² + 1.6324x + 189.64	0.9	<0.001	2.1
Specific biogas yields	L.biogas.kg VS added^-1	y = -0.0125x² + 1.5997x + 240.24	0.8	<0.001	2.9
	L.biogas.kg TS reduced^-1	y = -0.028x² + 3.7326x + 560.86	0.6	<0.001	6.0
	L.biogas.kg VS reduced^-1	y = -0.0194x² + 2.5794x + 650.54	0.3	<0.001	5.9
------------------------------------------------------------------------------Cattle--------------------------------------------------------------------------------
---------------------------Effluent pH----------------------------		y = -0.001x + 7.7988	0.8	<0.001	0.2
	TS (%)	y = -0.0019x² + 0.2241x + 41.29	0.8	<0.001	2.3
Reduction	VS (%)	y = -0.0018x² + 0.1738x + 47.20	0.7	<0.001	2.5
	NDF (%)	y = -0.0022x² + 0.293x + 39.50	0.8	<0.001	1.4
	L.biogas.kg TS added^-1	y = -0.0134x² + 1.2221x + 179.65	0.8	<0.001	2.1
Specific biogas yields	L.biogas.kg VS added^-1	y = -0.0178x² + 1.6064x + 214.8	0.9	<0.001	2.9
	L.biogas.kg TS reduced^-1	y = -0.0358x² + 3.6448x + 405.04	0.8	<0.001	6.0
	L.biogas.kg VS reduced^-1	y = -0.0487x² + 5.0892x + 426.84	0.8	<0.001	5.9