1 / 10

Composting

Composting. 27-1-2007. What is composting?. Composting is the process of producing compost through aerobic decomposition of biodegradable organic matter. Compost produced at the end of the process can be used in farming and gardening to improve soil quality. Principles of Composting.

Rita
Télécharger la présentation

Composting

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Composting 27-1-2007

  2. What is composting? • Composting is the process of producing compost through aerobic decomposition of biodegradable organic matter. • Compost produced at the end of the process can be used in farming and gardening to improve soil quality.

  3. Principles of Composting • Composting is the controlled decomposition of organic matter. • Rather than allowing nature to take its slow course, a composter provides an optimal environment in which decomposers can thrive. To encourage the most active microbes, a compost pile needs the correct mix of the following ingredients: • Carbon, Nitrogen (from composting materials) • Oxygen (from the air) • Water

  4. Type of composting • Active (hot) composting • ~55oC • Higher temperature kill most pathogens • Regularly stirring ensure aeration • Faster (take weeks) • Passive (cold) composting • ~30oC • Much slower (may take months) • May develop anaerobic condition, releasing odor and greenhouse gas (e.g. methane)

  5. Carbon : Nitrogen ratio • High-carbon sources provide the cellulose needed by the composting bacteria for conversion to sugars and heat. (e.g. starch and cellulose) • High-nitrogen sources provide the most concentrated protein, which allow the compost bacteria to survive and multiply. (e.g. animal manures, fruit and vegetable trimmings, leaves) • The most rapid composting occurs with the ideal carbon:nitrogen ratio of 25~30: 1 by dry chemical weight.

  6. Garden Composting Links (section 1.2.1)

  7. Composting in Hong Kong • Composting in Hong Kong is restricted to livestock waste at this moment. • Only 23 tonnes out of 200 tonnes of livestock waste collected daily is used in composting by contractor (EPD, 2003) • Take 6-8 weeks for compost to become mature

  8. Location of Sha Ling Livestock Waste Composting Plant (SLCP)

  9. Click to Link

  10. Further reference • Wikipedia • Green Hong Kong Campaign—Green School Handbook

More Related