What is Waste Sorting System and Why Do We Use Them?

24, Mar. 2025

 

What Goes Where? A Guide to Proper Waste Sorting for Residents

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Proper waste sorting is the cornerstone of a sustainable and efficient waste management system. By correctly separating trash, communities can significantly reduce the strain on landfills, conserve natural resources and reduce overflow of trash bins. Additional benefits of proper waste sorting include less volume in the trash dumpsters, fewer contamination fees and more tidy enclosures at your community. When residents understand and participate in effective waste sorting, they contribute to  a healthier environment for all.

The key factor in trash sorting is education. Organics and recycling guidelines can be confusing for managers and residents alike. That is why we have put together a handy infographic and flier that you can distribute to your residents. As always, it is important to check with your jurisdiction for detailed guidelines on what is permissible in your bins. By educating community residents on waste separation, you  ensure that valuable resources are recovered and that waste is managed in the most environmentally friendly way possible. We have created a waste sorting flyer to help in the effort to educate residents. In this blog, we will help you and your residents navigate which items should go into each bin.

Recycling bins are designed for materials that can be reprocessed and turned into new products. Common recyclables include: 

  • Paper
  • Cardboard
  • Glass bottles
  • Metal cans
  • Certain plastics

When recycling items, it is crucial to clean and dry these items before placing them in the recycling bin to avoid contamination. For example, paper products like newspapers, office paper and cardboard boxes are recyclable, while wax-coated paper and soiled napkins are not.

Plastics often have a recycling symbol with a number inside; typically, numbers 1 and 2 (like water bottles and milk jugs) are widely accepted in recycling programs. Glass should be empty and clean, and metals like aluminum cans and tin foil should be free of food residue. By following these guidelines, residents can ensure that their recyclables are actually recycled and not sent to a landfill due to contamination.

Organic waste includes food scraps, yard trimmings and other biodegradable materials that can be composted. Composting these materials helps reduce methane emissions from landfills and creates a nutrient-rich soil amendment that can be used in gardening and agriculture. In the organics bin, residents should include items like:

  • Fruit and vegetable peels
  • Coffee grounds
  • Grass clippings
  • Eggshells (in industrial composts)

It's important to exclude non-compostable materials such as plastics. If they are labeled 'biodegradable,' you may want to research whether your city or county processing facility accepts and handles biodegradable materials, as they may not break down in a typical composting process. In addition to traditional compost materials, encouraging the use of compostable bags made from plant-based materials can help residents keep their organics bin clean and support the composting facility's efforts in creating high-quality compost.

Regular trash bins are reserved for waste that cannot be recycled or composted. The following items should be placed in the regular trash dumpsters:

  • Chip bags
  • Candy wrappers
  • Styrofoam
  • Soiled food containers 

Don't forget! Hazardous materials like batteries, chemicals and electronic waste should not be disposed of in regular trash bins, as they require special handling and disposal methods to prevent environmental contamination. These should be taken to a special collection facility or left outside of the bin for electronic waste pick-up.

Community managers can help residents by posting clear guidelines and providing occasional reminders about what items are suitable for recycling,composting and traditional waste. Educating residents on local waste disposal resources for hazardous items can also prevent improper disposal and promote a safer community.

Community managers are instrumental in fostering a culture of environmental stewardship within their communities. Best practices for education include hosting workshops, distributing informative materials and providing clear signage at waste collection points. Managers can also encourage participation through incentives or recognition programs that reward residents for proper waste segregation.

In addition, establishing a feedback loop where residents can ask questions and express concerns about trash management practices can lead to continuous improvement and greater community involvement. By being thoughtful in their approach, community managers can inspire residents to make a positive impact on the environment through their daily waste sorting habits.

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Waste sorting - Wikipedia

Environmental practice of separating waste categories to make it easy to recycle

Waste sorting is the process by which waste is separated into different elements.[1] Waste sorting can occur manually at the household and collected through curbside collection schemes, or automatically separated in materials recovery facilities or mechanical biological treatment systems. Hand sorting was the first method used in the history of waste sorting.[2] Waste can also be sorted in a civic amenity site.

Waste segregation is the division of waste into dry and wet. Dry waste includes wood and related products, metals and glass. Wet waste typically refers to organic waste usually generated by eating establishments and are heavy in weight due to dampness. With segregation, each form of waste goes into its category at the point of dumping or collection, but sorting happens after dumping or collection. Segregation of waste ensures pure, quality material. Sorting on the other hand will end up producing impure materials with less quality.

These days, automatic waste segregators are gaining popularity and are already being used in many parts of the world like Australia.

Methods

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Waste is collected at its source in each area and separated. The way that waste is sorted must reflect local disposal systems. The following categories are common:[3]

  • Paper
  • Cardboard (including packaging for return to suppliers)
  • Glass (clear, tinted'no light bulbs or window panes, which belong with residual waste)
  • Plastics
  • Textiles
  • Wood, leather, rubber
  • Scrap metal
  • Compost
  • Special/hazardous waste
  • Residual waste

Organic waste can also be segregated for disposal:

  • Leftover food which has had any contact with meat can be collected separately to prevent the spread of bacteria.
    • Meat and bone can be retrieved by bodies responsible for animal waste.
    • If other leftovers are sent, for example, to local farmers, they can be sterilised before being fed to the animals.
  • Peels and scrapings from fruit and vegetables can be composted along with other degradable matter. Other waste can be included for composting, such as cut flowers, corks, coffee grounds, rotting fruit, tea bags, eggshells and nutshells, and paper towels.

Mechanisms for automated sorting

[edit] See also: Materials recovery facility § Process, and Recycling § Sorting

Automation of municipal solid waste sorting process is an active research area.[4] Notable mechanisms for automated sorting include:

  • Standardization of products, especially of packaging[5][6][additional citation(s) needed] which are often composed of different materials, in particular materials hard or currently impossible to either separate or recycle together in an automated way.[7]
    • Laws related to recyclability, waste management, domestic materials recovery facilities, product composition, biodegradability and prevention of import/export of specific wastes.
      • Since around , China,[8] Turkey,[9] Malaysia,[10] Cambodia,[11] and Thailand[12] have banned certain waste imports. It has been suggested that such bans may increase automation[13] and recycling, decreasing negative impacts on the environment.[14]
  • Optical sorting
    • Spectral imaging based sorting[4]
      • Systems that use hyperspectral imaging and algorithms developed via machine learning[15][16][17]
    • Near infrared spectroscopy[18][19]
    • X-ray based sorting[4]
    • Laser-induced breakdown spectroscopy[4]
  • Eddy current based sorting[4]

By country

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In Germany, regulations exist that provide mandatory quotas for the waste sorting of packaging waste and recyclable materials such as glass bottles.[20]

In Denpasar, Bali, Indonesia, a pilot project using an automated collecting machine of plastic bottles or aluminium cans with voucher reward has been implemented in a market.[21]

In India, the government inaugurated the Swachh Bharat Mission ("Clean India Mission") in , a nationwide cleanup effort. Before this national consolidated effort for systematic and total waste management came into common consciousness, many cities and towns in India had already launched individual efforts directed at municipal waste collection of segregated waste, either based on citizen activism and/or municipal efforts to set up sustainable systems.[22]

In Ukraine, people are learning to sort garbage. Garbage is sorted in schools and kindergartens in Khmelnitsky.[23][24]

In the United States, the Environmental Protection Agency reports that the infrastructure for recycling waste has not kept pace with the rate of waste production.[25]

In Australia, Smart Bins have been introduced as a solution for waste management issues that the country faces. The AI-powered smart bin is equipped to segregate recyclables all by itself. Experts also claim that a smart bin like this may also increase waste-recovery rates in the country and help produce better quality recyclable products that will add to Australia's GDP.[26]

Worldwide

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In terms of plastic waste sorting and recycling, an estimated 9% of the estimated 6.3 billion tonnes of plastic waste from the s up to has been recycled and another 12% has been incinerated with the rest reportedly being "dumped in landfills or the natural environment".[27]

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See also

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  • Environment portal
  • Ecology portal

References

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