Mechanical Biological Treatment Case Study
MBT is one of the waste treatment technologies that can be applied for municipal solid waste. The process mainly concentrates on removing partially mixed household waste mechanically and treating biologically. So very little amount of residual waste is useful. In this method the organic waste is stabilized and to recover the waste for fewer purposes.
Basic flow chart of a typical MBT Plant. Objectives of MBT:
Reduces the emission of methane from landfill.
Low open spaces in landfill.
Recyclabes are separated.
Minimising the contamination of landfill lechate.
Secondary fuels of high calorific value.
Production of solid or liquid fertilizers.
Working of MBT:
These are generally …show more content…
Before the biological treatment or sorting of material the preparation of residual mixed waste is done. The initial process goes with the removal of large sized waste like mattresses, carpets etc. This step helps in avoiding damage in machinery. Further, for separation stage 2 the methods of mechanical waste are set up for the materials. The main aim of this method is to split open deny sacks which subsequently open and blend the materials inside or to shred and homogenize the waste into smaller particle sizes suitable for mixed bags of partition procedures, or else to the biological treatment which rely on MBT plant.
Stage 2 - Separation of waste.
As shown in the above figure (), the sorting of material should be possible before or after biological treatment. By using the mechanical techniques the blended waste is sorted into different fractions.
Stage 3 - Biological treatment. The biological treatment can be done either before or after mechanical treatment. The procedure involves of sorting and disposal to landfill of the stabilized residual MSW. The following table explains the various types of biological …show more content…
Economical compared to other waste treatment technologies.
Disadvantages of MBT:
It is not an ultimate solution for treatment of waste.
Residual waste with decent volumes must be disposed to landfill.
The operating costs are very high compared with other techniques.
Low yields for markets.
Aerobic MBT Anaerobic MBT Mechanical Biological Stabilization Mechanical Physical Stabilization.
It requires low investment costs. Higher investment costs Reliable aerobic process.
Simple and most reliable MBT. MBTs with anaerobic are more complex. Increased risks in fire
50% and more landfill diversion in spite of the simple technique. Operation requires high technical skills. High yield of RDFs and 60-90% landfill diversion
No Biogas production and it consumes energy. It produces Biogas. No biogas production. Needs high fossil energy.
MBT with Aerobic Composting/Digestion.
The mechanical biological treatment which has aerobic digestion/composting as biological treatment generally called as Aerobic MBT.
Process by which organic waste is decomposed by micro-organisms under specific conditions to a biologically stable and end product in the presence of Oxygen.Also known as Aerobic