Title:
METHOD FOR PRODUCING BIOGAS FROM PREDOMINANTLY ANIMAL EXCREMENTS
Document Type and Number:
WIPO Patent Application WO/2012/152266
Kind Code:
A3
Abstract:
The invention relates to a method for producing biogas from predominantly animal excrement, in particular liquid manure or chicken manure, individually or as a mixture. Proceeding from the disadvantages of the prior art, a method is to be provided which is distinguished by a higher yield of crude gas or biogas and also a higher content of methane in the crude gas and enables an economically improved mode of operation. In addition, the biogas produced is intended to have a very low fraction of nitrogen. The proposed method relates, inter alia, to the following measures: - fermentation substrate is mixed with reduced-ammonia fermentation liquid supplied at least in an amount via which a loading of 2.5 g of NH4
+/I or below is set in the fermentation substrate, - the resultant fermentation substrate is subjected to a first fermentation during a time period from one to four days at a pH of below 6.5, wherein a hydrolysis and acidogenesis take place and a weak gas is produced as first biogas stream, - the fermented fermentation substrate is then pumped into a following fermenter and in this is subjected to a further fermentation, wherein further acidogenesis, acetogenesis and methanogenesis take place and in this process a second biogas stream having a lower hydrogen sulphide content than the weak gas is generated.
Inventors:
GUENTHER LOTHAR (DE)
Application Number:
PCT/DE2012/100124
Publication Date:
February 28, 2013
Filing Date:
May 04, 2012
Export Citation:
Assignee:
DGE DR ING GUENTHER ENGINEERING GMBH (DE)
GUENTHER LOTHAR (DE)
GUENTHER LOTHAR (DE)
International Classes:
C12P5/02; C02F11/04
Domestic Patent References:
| WO2011015328A1 | 2011-02-10 | |||
| WO2011010275A1 | 2011-01-27 |
Foreign References:
| DE10316680A1 | 2004-11-04 | |||
| DE19936341A1 | 2001-02-22 |
Attorney, Agent or Firm:
TRAGSDORF, Bodo (Dessau-Roßlau, DE)
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