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Biogas Magazine | Edition 07 | 10
lagers used to supply the cattle dung to the biogas plant and in return they were getting the Biogas and Biofertilizer. The balance was settled monthly in cash. The whole model was based on SYMBIOSIS, which in other word meant if the villagers would increase the price of raw material then they would need to pay higher price for Biogas and Biofertlizer.
in the above flow is generalized but in many cases similar process chain may occur e.g., in case of restaurant and household items. Many times the hygienization becomes important e.g., in case of slaughter house waste. There can also be the importance of highlighting different pretreatment methods.
Figure 1
Organic source
Collecting
Trans-shipment
Transport
The supply chain model is always a function of local scenario. Therefore, Identifying barriers and enablers is one of the critical step for a successful biogas plant. A typical process chain may look like (figure 1) Please note that the actual steps may vary depending on the type of substrates and places of availability and utilization of such feedstock. The optimization potentials for the collective utilization of waste must be studied beforehand. In addition to different process chain scenarios are to be considered methodically from end to end for different substrates and in the observation of results regarding their cost efficiency they should then be compared with another. The linkages
Extraneous material disposal
Homogenization
Sanitation
Biogas production
It is important that we should consider that raw material quantities can deviate within the stipulated range. The logistic components (collection, transport or storage) and the plant specific components (drainage, cutting, sorting, hygienization and sterilization plants) are important to be observed. It is possible to calculate the entire supply chain between the collecting points and the processing plants by using the several existing model. The direct route between sources and processing plants can also be considered. The CO2 emission which is caused by transport collecting process should also be considered with the entire covered distance.
Prof. P. K. Mishra H.O.D., Department of Chemical Engineering & Technology IIT-BHU, Varanasi