Waste is a very big issue in all countries. Waste management is a solution but how we will pursue it in the same. For that first, you have to understand what waste is, and how it is categorized.

What is a waste?

what is waste

Waste can be anything that is unwanted and unusable material or product. These are substances those discarded after their primary use. Basically, waste is generated from animals and humans. Moreover, urbanization and rapid enhancement in industries in increasing the production and consumption process. This results in a huge amount of waste.

The waste is classified according to different criteria. Next, we will cover all the major and micro classification of waste.

Categories of waste

Broadly waste is classified according to its physical state that is

  • Solid waste
  • Liquid waste
  • Gas waste

Then each category is further classified into subcategories. Let’s have look at the classification table-

Solid waste Waste that is in solid or semi-solid is solid waste. For example- Latex, waste tire, scrap metal, paint, furniture, glass, etc.
Liquid waste Waste that is in liquid form of liquid waste. Also known as sewage. This is mainly produced from domestic washing, chemicals, oils, and other harmful household liquids.
Gas waste The waste generated in gas form is gaseous waste. For example, carbon monoxide, carbon dioxide, sulphur dioxide, nitrogen dioxide,ozone ,etc.

These three types of waste have a further classification, let’s start with solid waste classification.

Solid Waste classification

Solid waste is classified into three main categories that are source-based, types based, property-based solid waste. To understand more about each category. Let’s have a brief about it.

Source-based Solid waste Types based solid waste Property-based solid waste
Municipal solid waste, Industrial waste, Institutional or commercial waste, Biomedical waste, Agriculture waste Plastic, Metal waste, Garbage, Bulk waste, Street waste, Dead animals, Construction waste, Demolition waste, Radioactive waste, Mining waste Biodegradable waste/organic waste. Like plant waste, Nonbiodegradable or inorganic waste.

Furthermore, we have to share the classification of solid waste. Now have a brief about each type of waste-

Next is liquid waste classification-

Liquid waste classification

Simply liquid waste that is in Liquid form. It is classified according to their sources of generation. Here are the categories

Industrial liquid waste Industrial waste that is discarded into rivers and lakes

For example- Acids, alkalis, paint thinner or other chemicals.

Sewage waste Sewage dumped in rivers, lakes and other sources of water by the large underground drains that are known as sewers.
Domestic liquid waste Soaps, detergents and other washing and home cleaning agents that discarded in sewers are domestic waste.
Agriculture waste Use of extra fertilizer means more than the required amount of fertilizer used in the field washed off in natural sources of water.
Petroleum waste Leakage of petroleum oils into sea during mining and shipping.

Next is the classification of gaseous waste

Gaseous Waste Classification-

Gaseous waste is generally produced by combustion of fuel. This waste is classified according to the type of gas produced during any kind of combustion. Here is the name of a gas lie in this category-

  • Carbon monoxide
  • Carbon dioxide
  • Sulfur dioxide
  • Nitrogen oxide
  • Nitrogen dioxide
  • Ozone
  • Smoke

These are the main  reason and categories of gas waste

Name of waste Gas Source
Carbon monoxide Incomplete combustion of fuel(petrol, cow dung cake, wood) produces carbon monoxide.
Carbon dioxide Complete combustion of fuel (petrol, cow dung cake, wood) produces carbon dioxide
Sulfur dioxide Sulfur dioxide is produced from the combustion of fossil fuel at power plants, industrial facilities, fuel combustion in ships, locomotives and other equipment
Nitrogen oxide Nitrogen is produced in the combustion of nitrogen-containing compounds. Moreover, when nitrogen and oxygen present in the environment combine and form nitrogen oxide.
Nitrogen dioxide Main Source of nitrogen oxide is the combustion of fossil fuel. especially fuel used in cars. Also, making of nitric acid, welding and using explosives is also produces nitrogen dioxide
Ozone Ozone is formed when pollutants emitted by cars, appliances, industries and other sources get interacted with each other in the presence of sunlight.
Smoke Smoke is produced in combustion of fuel, wood or in many burning processes.


Waste is a big issue all over the world. We need to manage it and reduce it as much possible. Classification of waste is an important part to understand waste management. We have covered the classification of waste on different criteria. Knowing this category will help you to manage waste in your house, industry, and surrounding.

Keep connected with us we are going to share many more information about waste


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