Home composting explained

Home composting is the process of using household waste to make compost at home. Composting is the biological decomposition of organic waste by recycling food and other organic materials into compost.[1] Home composting can be practiced within households for various environmental advantages, such as increasing soil fertility, reduce landfill and methane contribution, and limit food waste.[2]

History

While composting was cultivated during the Neolithic Age in Scotland, home composting experienced a much later start.[3] Indoor composting, also known as home composting, was discovered in 1905 by Albert Howard who went on to develop the practice for the next 30 years.[4]

J.I. Rodale, considered the pioneer of the organic method in America, continued Howard’s work and further developed indoor composting from 1942 on. Since then, various methods of composting have been adapted. Indoor composting aided in organic gardening and farming and the development of modern composting. It originally entailed a layering method, where materials are stacked in alternating layers and the stack is turned at least twice.

Fundamentals

Aerobic vs. Anaerobic

Two ways to home compost are through the aerobic and anaerobic method. Aerobic composting involves the decomposition of organic materials using oxygen and is the recommended method for home composting.[5] There are several benefits of aerobic (with oxygen) composting over anaerobic (without oxygen) composting such as less harmful byproducts. While aerobic composting does produce some carbon dioxide, anaerobic composting releases methane, which is a greenhouse gas significantly more harmful than carbon dioxide.[6] Aerobic compost is a faster process due to availability of oxygen allowing for growth of composting microorganisms. Aerobic composting calls for larger bins, oxygen, moisture, and turning (only if without worms).

Organic Waste

There are various types of organic waste that can be used to compost at home. Composting requires two types of organic materials: "green" waste and "brown" waste.[7] This is due to organic waste requiring four elements to decompose: nitrogen, carbon, oxygen, and water. A proper carbon-to-nitrogen ratio must be maintained along with proper oxygen and water levels in order to create compost. An effective ratio is 25-30 parts carbon to 1 part nitrogen.

All compostable material has carbon, but have different levels of nitrogen. Greens have a lower carbon-to-nitrogen ratio. Greens refer to leafy or fresh organic ingredients and are generally wet. Browns are richer in carbon and are generally dry ingredients.[8] Too much carbon will result in a drier compost pile that will take more time to decompose while too much nitrogen will result in a more moist, slimy, and pungent pile. To obtain an effective ratio for decomposition, include two to four parts brown compost to one part green compost in the pile.

What to Compost at Home[9] [10] !Greens!Browns
Fresh grass clippings/leavesDead leaves
Fruits and vegetablesBranches
Fruit and vegetable peels and rindsTwigs
Food scrapsNut shells (except walnuts)
Cooked rice/pastaPaper (stationary, newspaper, toilet paper, napkins, etc.)
Stale breadPlain cardboard (not glossy)
Egg shellsPaper egg cartons
Coffee groundsUsed paper coffee filters
Tea bagsLint
Hair, fur, and nail clippingsPet bedding (from hamsters and such)
What Not to Compost at Home!Materia!Reason
Meat or fish (including bones)Creates odor and attracts pests
Dairy products (eggs, milk butter, etc.)Creates odor and attracts pests
Fats and oilsCreates odor and attracts pests
Pet fecesMight have harmful parasites, bacteria, viruses, etc. to humans
Coal ashMight have harmful substances to plants
Yard trimmings with pesticidesMight have harmful substances to plants

Implementation

Step 1: Set Up Bin

The first step of composting at home is to secure a composting bin and location.

Securing an additional smaller compost bin to collect food scraps is recommended if the primary bin is further from the main area where compost materials are frequently produced. This will avoid the inconvenience of constantly moving to the location of the main compost bin.[13]

Step 2: Gather Materials

The next step to home composting is to gather materials for the compost layers. Most items available in a household include various food scraps, coffee grounds, tea bags, shredded paper, and more.[14] To maintain a proper carbon-to-nitrogen ratio, collect approximately two to four parts of brown compost matter to one part green compost matter. Breaking down ingredients before adding them to the compost pile will allow them to decompose more easily and quickly.

Step 3: Add to Bin

There are various methods of composting but the suggested method at home involves aerobic composting with worms (vermicomposting) or without worms.

Layering

Home composting can be completed through a layering process. Start with a layer of coarse ingredients to allow for airflow, then alternate with layers of nitrogen-rich (greens) and carbon-rich materials (browns), and mix together. Bury food scraps in the center of the pile and add soil on top for every few layers.

Vermicomposting

To vermicompost, approximately one pound of worms can be added to the top of the soil layer but will need ample bedding (newspaper, shredded paper, etc.). Red wiggler worms (Eisenia fetida) are suggested as they are able to eat half their body weight in one day.[15] Vermicomposting can take place indoors or outdoors. However, it is recommended to keep the worm bin indoors since worms can die from extreme temperatures. Vermicomposting is faster (2–3 months) than no-worm composting (3–9 months), involves minimal maintenance, limits odor, and provides multiple nutrients to the soil.[16]

Step 4: Aftercare

Maintenance

Regardless of the method used, a proportionally small amount of water may need to be added to the pile when dry to ensure proper moisture content. Composting without worms will require turning the pile every few weeks to guarantee proper aeration. The more often it is turned, the faster the compost will decompose.[17] Vermicomposting does not require turning.

Usage

Compost is finished if the material is dark, crumbly, smells earthy, and contains no added scraps.[18] Finished compost can be used in a multitude of ways such as for mulch, amending soil, fertilizer, and compost tea.

Methods of Using Compost!Use!Instruction
MulchApply a 3-6 inch layer to the bed and rake.
Amend SoilMix 1–2 inches of the compost into the top 3–5 inches of the soil. This can also be done before adding plants or seeds to aerate the soil and add nutrients.[19]
FertilizerAdd 1-2 inches of compost to grass or plant pots and rake or mix.
Compost Tea (liquid fertilizer)Steep the compost in water for a few days, strain, and use it to water or mist plants.

Environmental Benefits

Increase Soil Health

Home composting will promote soil health biologically, chemically, and structurally.[20] It contains three major nutrients (nitrogen, phosphorus, and potassium) as well as other elements like calcium, iron, magnesium, and zinc that assist in soil and plant health. It works as a natural and organic fertilizer as opposed to using synthetic fertilizers with harmful chemicals.[21] Home compost is also able to improve soil water retention, capacity, and productivity.[22] It provides beneficial microbes that increase nutrients and humus formation in the soil. Humus acts like a glue agent and binds soil together, which helps prevent soil erosion.[23]

Reduce Greenhouse Gas Emissions

One benefit of aerobic home composting is the reduction in methane emissions, one of the most threatening greenhouse gases to the environment.[24] Food waste and packaging are responsible for 70% of household waste that resides in landfills.[25] It is estimated that one third of all food produced will be wasted.[26] Over 95% of food waste ends up at landfills where it produces methane, carbon dioxide, and other greenhouse gases through anaerobic digestion. For example, meats such as beef are the greatest producers of methane gas in landfills.[27] These greenhouse gases trap heat within the atmosphere and further contribute to climate change.[28] It is predicted that by 2050, global greenhouse gas emissions will increase by 80% from food production alone.[29] Home composting can limit landfill waste and therefore, methane emissions as well.

When food waste is thrown out and ends up in waterways, it can contribute to algae blooms. Algae blooms can produce toxic emissions that have harmful health effects on mammals and organisms, including humans.[30] Eutrophication, or extreme nutrient levels, leads to dense algae bloom formation which can damage drinking water and develop “dead zones” that harm marine life. Algae blooms also heavily contribute to global methane emissions.[31]

Greenhouse gases are emitted in the manufacturing of synthetic fertilizers so by using organic compost material to fertilize home gardens instead, these emissions will be reduced. By limiting the amount of food waste that ends up in landfills and using homemade fertilizer through home composting, households will reduce their carbon footprint.

Reduce Waste

Food waste contributes to the hunger crisis, in which 690 million people in the world are undernourished[32] and households are the reason behind a significant fraction of food waste.[33] A food chain waste study of Melbourne demonstrated that 40% of waste occurs post-consumer. This adds to the wastage of energy, emissions, and cost of production and supply.[34] Almost an equal amount of food that is produced is disposed of (approximately 40%). The U.S Department of Agriculture estimates that approximately 133 billion pounds and $161 billion worth of food were wasted in 2010 alone.[35] Home composting can limit the amount of waste contributed by households since it will not be disposed of but instead be used productively.

Notes and References

  1. Book: 2011-01-01. Agriculture and Agro-Industrial Wastes, Byproducts, and Wastewaters: Origin, Characteristics, and Potential in Bio-Based-Compounds Production. en. 531–545. Academic Press . 10.1016/B978-0-08-088504-9.00389-5. 9780080885049 .
  2. Web site: Hu. Shelia. 2020-07-20. Composting 101. 2021-07-27. NRDC. en.
  3. Web site: Carry on Composting ~ Introduction . 2023-08-03 . Carry on Composting . en-US.
  4. Web site: Short History of Compost. 2021-07-27. Earth Matter.
  5. Misra, R. V., R. N. Roy, and H. Hiraoka. On-farm composting methods. Rome, Italy: UN-FAO, 2003.
  6. Web site: Worp. Sarah. Aerobic vs Anaerobic Composting Systems - CompostNow. 2021-08-04. compostnow.org. 2 March 2020 . en.
  7. Web site: US EPA. OLEM. 2013-04-17. Composting At Home. 2021-07-29. www.epa.gov. en.
  8. Web site: How To Compost At Home : Life Kit. 2021-07-29. NPR.org. en.
  9. Web site: Making Your Own Compost Is Easy With this Step-by Step Guide. 2021-07-31. Better Homes & Gardens. en.
  10. Web site: What to Compost - List of Household Items Safe for Composting. 2021-07-31. Organic Lesson. en.
  11. Web site: 2017-09-13. All You Need to Know About Indoor Composting. 2021-08-03. Bob Vila. en.
  12. Web site: Home Composting & Green Landscaping. 2021-08-03. www.mass.gov. en.
  13. Web site: Greatley. Dan. 2018-06-16. Composting in Small Spaces. 2021-08-04. Tiny Life Gear. en-US.
  14. Web site: Vanderlinden. Colleen. 2020-07-30. Tips for Indoor Composting. 2021-08-05. The Spruce. en.
  15. Web site: B.. Donny. 2014-01-01. Why Red Wiggler Worms? -. 2021-08-07. thesquirmfirm.com. en-US.
  16. Web site: 2017-08-21. What is the Difference Between Vermicomposting with Worms and Hot Composting?. 2021-08-06. Uncle Jim's Worm Farm. en-US.
  17. Web site: Rhoades. Heather. 2021-02-22. Turning Your Compost Heap – How To Aerate A Compost Pile. 2021-08-07. www.gardeningknowhow.com.
  18. Web site: Krosofsky. Andrew. 2020-11-03. How to Use Compost as Fertilizer. 2021-08-08. Green Matters. en-US.
  19. Web site: Ellis. Mary Ellen. 2020-01-13. What To Do With Compost – Learn About Compost Uses In The Garden. 2021-08-08. www.gardeningknowhow.com.
  20. Web site: Compost – Improves Soil Health. 2021-08-08. US Composting Council.
  21. Chai, R., Ye, X., Ma, C. et al. Greenhouse gas emissions from synthetic nitrogen manufacture and fertilization for main upland crops in China. Carbon Balance Manage 14, 20 (2019).
  22. Web site: O'Connor. Claire. 2014-08-11. Using compost to improve soil health and crop productivity. 2021-08-08. NRDC. en.
  23. Web site: Compost – Erosion Control Benefits. 2021-08-08. US Composting Council.
  24. Web site: Borunda. Alejandra. 2019-01-23. Methane facts and information. https://web.archive.org/web/20210218020654/https://www.nationalgeographic.com/environment/article/methane. dead. February 18, 2021. 2021-08-09. National Geographic. en.
  25. Web site: Paul. Arindam. 2019-06-11. 13 Daily Habits That Are Bad For The Environment. 2021-07-23. Blue and Green Tomorrow.
  26. Web site: May 19, 2024 . Fight climate change by preventing food waste . World Wildlife Fund.
  27. Web site: Goldsmith . Tom . May 19, 2024 . [wmich.edu/sites/default/files/attachments/u2182/2019/On-Campus Composting_ "On-Campus Composting: How to Start, Evolve, And ..." ]. Western Michigan University.
  28. Melikoglu, M., Lin, C. S. K., & Webb, C. (2013). "Analysing global food waste problem: pinpointing the facts and estimating the energy content." Central European Journal of Engineering, 3(2), 157-164.
  29. Lentz, Cheyenne. (2018-11-05). "5 Things You Do Every Day That Are Good for the Environment and 5 That Are Hurting It." Insider. Retrieved 2021-07-23.
  30. Carmichael, W. W., & Boyer, G. L. (2016). "Health impacts from cyanobacteria harmful algae blooms: Implications for the North American Great Lakes." Harmful algae, 54, 194-212.
  31. Web site: Worsening Algae Blooms Could Significantly Increase Global Methane Emissions. 2021-08-11. Yale E360. en-US.
  32. Action Against Hunger. (2021). "World Hunger: Key Facts and Statistics 2021." Action Against Hunger. Retrieved 2021-07-23.
  33. Web site: 2020. The Problem of Food Waste. 2021-07-23. FoodPrint. Grace Communications Foundation.
  34. Pears, A. (2017). "Targeting energy efficiency: Halve consumption, double productivity." ReNew: Technology for a Sustainable Future, (141), 20-21.
  35. Web site: Why should we care about food waste?. 2021-07-23. www.usda.gov. en.