Identification of new critical points for logistics model in cumulative methane yield curves after co‐digestion of apple pulp and chicken manure with sulphuric acid pretreatment and a new modelling study

The work is aimed at increasing the biogas yield rate at biogas plants by means of codigestion poultry manure in combination with extruded wheat straw. To achieve this goal a series of batch tests were performed to study the yields of biogas and CH4 in anaerobic fermentation of mixtures of manure with extruded wheat straw. The working hypothesis of the study was that the wheat straw addition would allow optimizing carbon to nitrogen ratio reducing thus the inhibitory effect of ammonium nitrogen contained in poultry manure on the digestion process. The most important result of the study consisted in the development of a methodology for determining the efficient ratios of extruded straw to poultry manure, at which the highest rate of methane yield was ensured. The two series of the batch assays at 36°C were performed to study the effect of the straw addition to chicken manure at high and low initial volatile solids concentrations. In each series, three types of mixtures were prepared – with 100%, 65% and 35% of poultry manure by volatile solids content in the combination with wheat straw pellets. The significance of the research results was in the fact that the use of extruded straw together with chicken manure could increase the rate of methane yield by almost two times, compared to the fermentation of only poultry manure. The positive effect of wheat straw addition to poultry manure was found in mixtures with a high initial volatile solids concentration, and hence, a high concentration of nitrogen.

Download Full-text

Dilute sulphuric acid pretreatment and enzymatic hydrolysis of Moringa oleifera empty pods

Industrial Crops and Products ◽

10.1016/j.indcrop.2012.11.001 ◽

2013 ◽

Vol 44 ◽

pp. 227-231 ◽

Cited By ~ 18

Author(s):

Ena Hernández ◽

Ariel García ◽

Michael López ◽

Jürgen Puls ◽

Juan C. Parajó ◽

...

Keyword(s):

Enzymatic Hydrolysis ◽

Sulphuric Acid ◽

Moringa Oleifera ◽

Acid Pretreatment ◽

Hydrolysis Of

Download Full-text

ROLE OF THE SEED COAT IN GERMINATION OF CISTUS POPULIFOLIUS L.

Israel Journal of Plant Sciences ◽

10.1080/07929978.1997.10676696 ◽

1997 ◽

Vol 45 (4) ◽

pp. 329-331 ◽

Cited By ~ 3

Author(s):

Félix Pérez-García ◽

Adrian Escudero

Keyword(s):

Sulphuric Acid ◽

Seed Coat ◽

Hot Water ◽

Thermal Treatments ◽

Distilled Water ◽

Acid Pretreatment ◽

Dry Heat

Effect of mechanical scarification, dry heat, hot water, and sulphuric acid on the germination behavior ofCistus populifoliusL. (rockrose) was studied. Untreated seeds after 60 days of incubation germinated less than 7%. After thermal treatments, 90% germination was achieved, and sulphuric acid pretreatment gave 61% germination. Soaking in distilled water did not increase germination, but scarification of the seed coat gave 57%. Hardness and impermeability of the seed coat appear to cause deep dormancy inC. populifoliusseeds.

Download Full-text