Types of waste

The classification of waste can be according to its origin, that is, where it comes from or what type of human or natural activity it is generated. This approach allows us to better understand its impact and design appropriate strategies for waste management. Let’s see what the main types of waste are according to where they originate:

• Domestic waste: is waste generated in homes as a result of daily activities. They include solid waste such as food scraps, packaging, paper, plastics, glass, old clothing and small appliances. Also liquid waste such as oils, soaps, etc.
• Industrial waste: produced in factories, workshops and other facilities linked to industrial activities. They can be very varied, from metals, chemicals and plastics to remains from production processes. Here you can learn more about Industrial Waste: what it is, examples, types, classification and management.
• Agricultural waste: coming from agricultural and livestock activities, these waste include crop remains, manure, plastics used in crops (such as blankets or packaging), and chemicals such as fertilizers and pesticides.
• Commercial waste: generated in commercial establishments, such as stores, offices, markets and restaurants. They include packaging, organic waste, paper, cardboard and products discarded in large quantities.
• Construction and demolition waste (CDR): originates from construction, remodeling and demolition works. Among them are debris, wood, metals, cement and other materials.
• Sanitary waste: is waste originating from hospitals, clinics and laboratories. They include biological materials, expired medications, syringes and other objects that may be infectious or dangerous.
• Natural waste: these are those generated by the ecosystems themselves, such as fallen branches, leaves, fruits or animal corpses.

Classifying waste according to its composition allows us to understand its physical and chemical nature, which is essential to define its potential for recycling, treatment or final disposal:

• Organic waste: these wastes have biological origin and are biodegradable, that is, they can decompose naturally thanks to the action of microorganisms. They include food remains, leaves, wood, shells and animal excrement. In this other summary we explain what organic waste is and examples.
• Inorganic waste: these are those that do not have biological origin and do not degrade easily naturally. Among them are plastics, glass, metals and ceramics. Here you can see more information about Inorganic Waste: examples for children.
• Hazardous waste: these wastes have characteristics that make them harmful to human health and the environment. They can be toxic, flammable, corrosive, reactive or infectious.
• Recyclable waste: this group includes materials that can be transformed into new products through industrial processes. These include paper, cardboard, plastic, glass and metals. Here you can learn about the Types of recycling.
• Non-recyclable waste: refers to those materials that, due to their composition or because they are polluting waste, cannot be recycled in a practical or profitable way. Examples are certain types of plastics, synthetic textiles and waste composed of several inseparable materials.
• Biodegradable waste: Although it overlaps with organic waste, this term is used specifically for materials that decompose quickly in the environment without leaving contaminants, such as untreated paper, cardboard, and compostable bags.
• Non-biodegradable waste: these are those that do not decompose or do so extremely slowly, such as plastics, glass and metals.

Biodegradability refers to the ability of materials to decompose naturally thanks to the action of microorganisms such as bacteria and fungi. Classifying waste according to this criterion allows us to identify those that can be reintegrated into the environment without causing significant damage and those that require special handling to minimize their impact:

Biodegradable waste

• Food remains (fruits, vegetables, peels).
• Untreated paper and cardboard.
• Untreated wood.
• Agricultural and livestock waste, such as manure or crop residues.

Non-biodegradable waste

• Non-compostable plastics.
• Glass.
• Metals.
• Synthetic chemicals.

The hazardousness of waste is determined by its capacity to cause harm to the environment or human health, whether due to its chemical composition, physical properties or biological characteristics. Let’s see how they are classified depending on their danger:

Hazardous waste

They are those that have properties that make them harmful or that represent significant risks. Some examples are:

• Batteries and batteries (due to their content of heavy metals such as mercury, cadmium or lead).
• Industrial chemical waste (acids, solvents, pesticides).
• Hospital waste (syringes, contaminated surgical material).
• Used oils and petroleum products.
• Radioactive materials.

Here we tell you more about Hazardous Waste: classification, examples and management.

Non-hazardous waste

They are those that do not present characteristics harmful to health or the environment, as long as they are managed properly. We have common examples like:

• Food remains.
• Paper and cardboard.
• Uncontaminated glass and metals.
• Non-toxic plastics.

This type of waste requires specialized management due to the risks it may represent for public health and the environment, such as infections, chemical or radiological contamination. These are the main categories:

• Non-hazardous biomedical waste: these are those generated in medical activities that do not represent specific risks to health or the environment, such as uncontaminated gloves, masks and gowns.
• Hazardous biosanitary waste: includes materials that have been in contact with body fluids, tissues or infectious agents, making them potentially dangerous to human or animal health. Some examples are: needles, syringes, scalpels and other sharp objects.
• Chemical sanitary waste: these are those that contain chemical substances used in hospitals and medical laboratories, which can be toxic, corrosive or reactive, such as expired or leftover medications and disinfectant solutions.
• Radioactive health waste: is waste that contains radioactive materials used in medical treatments or research, such as radioactive isotopes used in cancer therapies and equipment contaminated with radiation, such as gloves or protective suits.
• General non-hazardous waste: this is common waste generated in hospitals, similar to domestic waste. Although they do not present special risks, they require correct separation to prevent them from mixing with hazardous waste.

You can learn more about Sanitary Waste: what it is, types and management at this link.

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