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CV0001

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by

Brenda Teo

on 2 November 2013

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Transcript of CV0001

FOOD WASTE
What is food waste?
Leftovers
Expired food products
Unwanted/Rejected fruits and vegetables
3. Landfilled
2. Incinerated
1. Collected as bulk organic waste by waste management companies such as Colex Holdings Ltd and SembWaste Pte Ltd
How food waste is treated
in Singapore?
IUT Global
1) Save space for landfills
2) Incineration process is not energy efficient
3)Useful by-products from recycling food waste:
-Compost and fertilisers
-Biogas
Reasons to recycle food waste
Project Title: Segregation of food waste impurities for recycling
CV0001 - Sustainable waste management
Group 15
Content
1)Background knowledge
2)Case Study
3)Solutions
4)Justifications
5)Conclusion
Aims
Process 800 tonnes of food waste daily, producing up to 2.13 megawatts of electricity enough to power up to 10000 homes
Case Study
Reality
Processed only 120-130 tonnes of food waste a day, producing electricity enough for only 500 homes
Consequences
Incurred losses of $8.8million over 3 years
High impurity content due to non segregation of food waste impurity
Main Problems of IUT Global
Resulting in high maintenance costs as wear and tear of machines occur more frequently due to processing of wastes with high impurity content (> 15%)
Solutions
&
Justifications
Group 15
Solutions
Justifications
1) Feasibility of Rotating Tunnel
- Experiment showed that more than 95% of the fibrous impurities are being captured.
- Rotating Tunnel is highly effective in removing fibrous impurities.
2) Feasibility of Fan Machine
- Function of Fan Machine is to blow off light weight impurities.
- Fan Machine uses a technology that is similar to that of an Air Classifier.
- Air Classifier is an existing product that has been used for many years.
- The Fan Machine can be anticipated to be feasible as well.
3) Simplicity of the project
- Capability and complexity of the Air Classifier far exceeds the requirements for Step 5
of our process.
- Only the air emitting component
of the Air Classifier will be
used in the Fan Machine.
Justifications
4) Solutions to the problems faced by IUT
Wholesale centres
Supermarkets
Food centres
Amount of food waste collected increases significantly
5) Avoidance of high maintenance costs
Maintenance and additional labour costs
Food waste collected & recycled
Start-up costs will be recovered
X
Avoided
Solutions
•Addition of procedures to the current practice
•To enhance the effectiveness of food waste recycle
Step 4
Step 6
Because..
Step 2
Step 1
6 steps solution - Segregation of food waste impurities for recycling
• Separating larger visible impurities via handpicking.
• Workers at the side to remove impurities from the conveyer belt.
• Handpicking is still preferred over the rest due to the context.
•Remaining-
Absorbent
&
Non-absorbent
Impurities
->Step 5 limitation - to only remove absorbent impurities
What exactly are the absorbent impurities?
Fibrous impurities which are
decomposable
Eg: Tissue paper, kitchen paper towels
Why do we want to remove it?
Higher chemical stability - resistant to industrial rapid biological breakdown of organics.
Affect efficiency of process
Decomposing reaction
Affect compost quality
Liquification & Fiberisation
Liquified food waste will go through a simple fiberisation machine
Strip down fibrous impurities
The details
Disturbance flaps - introduce
turbulence


->Re-distribute the impurities fibres towards the capturing surface

->Designed to cause minimum disruption to capture fibres
Clearing through reverse rotation.
Remaining food wastes are drained using a sieve
This is to facilitate the next process.
Step 5
•Food wastes are loaded onto conveyer belt that is designed with container at one side and fan machines on the other.
•The purpose is to remove light weight impurities such as plastics.
•Using an existing technology called Vertical Composting Unit (VCU).
•The technology hasten the aerobic decomposition by controlling air and temperature .
Methane and fertilizers will be produced.
Conclusion
Keep out non-targeted materials -
->Hooks will be sized accordingly
->Maximise hooks placement density
Amount
of impurities
Implemented
solution
without
with
More efficient in recycling food waste & contributes towards sustainable waste management
Credits: Group 15 - Brenda Teo, Jane Teo, Chew Jing Xuan, Joel Goh, Francis Young, Wong Zhi Hao
->They are food items that are discarded and usually being handled by waste management companies.
Impurities:
Plastics
Styrofoam
Fibrous Materials
step 3
•Rotating tunnel
->Hooks lining - Based on
Velcro's 'hook-and-loop' theory
5-8%
Hooks - pointing with rotation direction
->faciliate capturing of fibrous impurities
Full transcript