Classify solid waste in terms of source and types of solid wastes. Explain the steps to manage this waste. Add a note on advantages and disadvantages of landfills.

Source and Type

Waste is classified by origin (municipal, industrial, agricultural, biomedical, e-waste) and by type (biodegradable, non-biodegradable, recyclable, hazardous, inert). Andhra Pradesh’s agrarian economy yields mostly biodegradable waste, but urban areas like Visakhapatnam face increasing non-biodegradable and hazardous waste. This classification guides appropriate handling and disposal methods.

Management Steps

Segregation at source into biodegradable, recyclable, and non-recyclable waste is critical; Andhra Pradesh’s 2022 audit revealed only 75% actual segregation despite claims of 98%. Collection uses colour-coded bins, followed by processing (composting, recycling, biomethanation) and disposal. Efficient collection and transportation reduce littering and contamination.

Advantages

Landfills are cost-effective, reduce odor and pests by daily soil covering, and can be repurposed post-closure as parks or parking lots, aiding urban land use.

Disadvantages

Traditional landfills cause leachate contamination and methane emissions. In Andhra Pradesh, only 4 out of 123 ULBs had sanitary landfills in 2022, highlighting infrastructure gaps. Methane contributes to climate change, and leachate pollutes groundwater.

Sanitary Landfills

Engineered with impermeable liners to prevent leachate leakage, sanitary landfills are more sustainable but costly to build and maintain, requiring investment for wider adoption.