Phd Thesis On Biogas Production

Phd Thesis On Biogas Production-56
The “Design of Experiment” (DOE) technique was employed as investigation method, since the response of interest (“methane yield”) was affected by several variables which can interact with each other.The advantage with respect to the traditional method of studying the effect of “One Factor at a Time” (OFAT) is that the DOE can detect and quantify the interactions between variables.

The “Design of Experiment” (DOE) technique was employed as investigation method, since the response of interest (“methane yield”) was affected by several variables which can interact with each other.The advantage with respect to the traditional method of studying the effect of “One Factor at a Time” (OFAT) is that the DOE can detect and quantify the interactions between variables.Macroalgae, commonly known as seaweeds, are particularly suitable as substrate for biogas (~ 60% methane) production through anaerobic digestion (AD).

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Altogether, research outcomes from this study are relevant for the production of protein concentrates from locally grown crops and for further development of green biorefineries in Denmark.

Algal biomass is attracting more and more interest due to new potentials for overcoming the drawbacks relating to first and second generations of biomass for biofuel generation.

In general, prior AD a pretreatment step is necessary; this has to be efficient both in terms of methane yields and energy consumption.

An optimal organic substrate concentration has to be selected in order to maximise the yields and avoid overloading phenomena.

The organic matters contained in these de-oiled cakes can be converted to useful energy by adopting a proper waste-to-energy conversion process.

Hence, an attempt was made in this investigation to use the Karanja seed cake (SCK) as a potential feedstock for producing biogas by anaerobic digestion, and the produced biogas was proposed as an alternative fuel for CI engines.A leaf protein concentrate suited as protein feed for monogastric animals is produced, while using a process that is in agreement with the organic production guidelines.In laboratory trials, overall protein recoveries from 12% up to 42% of total plant proteins were achieved in the leaf protein concentrate.The leaf protein concentrates presented relatively high protein contents up to 46% DM, balanced amino acid compositions compared with soybeans and high proportions of essential amino acids for pigs and poultry.Anaerobic co-digestion of the process side stream fractions i.e.It is produced from edible and non-edible oils, animal fat, and algae by the transesterification process.In India, Karanja (Pongamia pinnata) a non-edible oil seed is considered as a potential feedstock for biodiesel production.The extraction of proteins from leaves, integrated in a green biorefinery, may represent an attractive solution to the increasing demand for protein-rich animal feeds while decreasing the dependency on soybean imports.Thereby such green biorefineries could contribute to the development of more self-sufficient and sustainable agricultural systems in Europe.Important parameters, such as the p H, temperature, hydraulic retention time (HRT), and carbon/nitrogen ratio (C/N) were evaluated and analyzed.The results indicated that the sample S3 gave the best result, in comparison with the other samples, and the methane (CH4) and carbon dioxide (CO2) contents in the biogas were found to be about 73% and 17% respectively.

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