Food Waste Treatment in Hong Kong

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Questions and Answers

What is the main product of anaerobic digestion technology?

Clean water
Natural gas (correct)
Organic waste
Fertilizer

What is the estimated capacity of an Organic Waste Treatment Facility (OWTF) for optimal operations?

50 to 100 tonnes per day
300 to 500 tonnes per day
500 to 700 tonnes per day
100 to 300 tonnes per day (correct)

Which of the following is NOT a method for treating food waste mentioned?

Composting
Anaerobic digestion
Incineration (correct)
Dehydration

How many Organic Waste Treatment Facilities (OWTFs) are envisioned to be built in Hong Kong by 2024?

Five to six (B) Signup and view all the answers

What is a significant benefit of anaerobic digestion technology compared to other methods?

Production of biogas for renewable energy (A) Signup and view all the answers

What is the primary limitation mentioned regarding public participation in food waste recycling programs?

Insufficient treatment capacity (B) Signup and view all the answers

How much surplus electricity can the estimated OWTF produce?

1 million kWh (D) Signup and view all the answers

Which method for recycling food waste is considered less effective compared to anaerobic digestion?

Bokashi method (D) Signup and view all the answers

What is the primary issue caused by grease and oil entering the sewer system?

It accumulates in sewer pipes, leading to reduced capacity. (C) Signup and view all the answers

What measures are in place in Hong Kong regarding grease and oil discharge into sewers?

Limits are set by the Water Pollution Control Ordinance. (A) Signup and view all the answers

Why is food waste unsuited for compaction at RTS?

It generates offensive odors when compacted. (B) Signup and view all the answers

Which food waste recycling method utilizes anaerobic digestion to enhance energy potential?

Biodiesel production from UCO (B) Signup and view all the answers

What is one of the goals of creating a network of recycling plants for food waste?

To recycle food waste into compost efficiently. (B) Signup and view all the answers

What is a significant benefit of local technology innovation in food waste recycling?

Enhanced biological treatment methods (D) Signup and view all the answers

What is the capacity range for on-site composting schemes for individual estates in Hong Kong?

50 kg to 100 kg per day. (C) Signup and view all the answers

How does separating food waste impact its recycling?

It allows for quick transportation to recycling facilities. (B) Signup and view all the answers

Which factor is being researched to improve the quality of composting end products?

Reducing composting duration (D) Signup and view all the answers

Which method is promoted for recycling food waste in Hong Kong?

Creating a network of recycling plants for compost. (B) Signup and view all the answers

What method is often explored to reduce odour and nitrogen loss in food waste recycling?

Anaerobic digestion (D) Signup and view all the answers

What is one outcome observed from private sector-led food waste recycling initiatives?

Increased participation in food waste collection programs (C) Signup and view all the answers

What is a potential environmental hazard of untreated grease deposits in sewers?

Sewage overflows and offensive odors. (C) Signup and view all the answers

Which of the following statements about food waste recycling technologies is TRUE?

They include local research supported by various funding sources. (A) Signup and view all the answers

What is one of the goals in developing composting techniques for food waste?

To shorten the composting time. (A) Signup and view all the answers

What does ECF stand for in the context of food waste treatment funding?

Environmental Conservation Fund (D) Signup and view all the answers

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Study Notes

Food Waste Treatment - Hong Kong

Hong Kong is focused on developing local technology for food waste recycling
Anaerobic digestion is a mature technology for large-scale food waste recycling
- Can produce biogas (natural gas) and compost
- Example: OWTF1 can produce up to 14 million kWh of surplus electricity
- Optimal capacity of an OWTF is between 100 to 300 tonnes per day
Hong Kong plans to build a network of 5 to 6 OWTFs between 2014 and 2024
Combined recycling capacity of 1,300-1,500 tonnes per day
Grease and oil in the sewer system presents a significant environmental concern
- It causes blockages, overflows and unpleasant odours
- The Water Pollution Control Ordinance limits the amount of grease and oil discharged into the sewer system
Food waste is not suitable for long-haul transport due to quick decomposition
OWTFs provide a suitable way to efficiently recycle food waste
- Reduces transportation distance and potential nuisance
Hong Kong has been promoting food waste separation:
- Compost is the main method of recycling
- Kowloon Bay Pilot Food Waste Composting Plant is operational
- On-site composting schemes for households have a capacity of 50-100kg per day

Food Waste Treatment Cost Data

Table: (The text describes a table with cost data for various food waste treatment options. It mentions the pilot plant, On-site Composters, and various composting facilities. However, it doesn't include specific cost values in the text, it only mentions the headers for a table.)

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