Waste Segregation – Delhi’s Mixed Garbage Challenge Limits Treatment Progress

Waste Segregation – Delhi waste management remains under pressure as the city struggles to ensure that household and commercial waste is separated before collection. With thousands of tonnes of municipal waste generated every day, weak source segregation continues to affect recycling, composting, treatment capacity and landfill reduction efforts.

Delhi municipal waste segregation remains the key to cleaner processing –

Delhi’s waste problem is often linked to landfill overflow, limited treatment facilities and rising garbage volumes. However, a major part of the challenge begins where waste is first thrown away. When wet, dry and recyclable materials are placed in the same bin, the entire treatment chain becomes more difficult and costly.

The city produces about 11,852 tonnes of municipal solid waste each day. The Municipal Corporation of Delhi, which manages most of this waste, reported source segregation at only 59% of premises in 2024-25. As a result, a large quantity of mixed waste reaches processing plants, reducing the effectiveness of recycling and composting operations.

Large gap between civic agencies

The difference in segregation performance across Delhi’s civic bodies remains significant. The New Delhi Municipal Council has consistently maintained segregation levels above 90% and has recorded complete segregation in several reporting years. During 2024-25, its reported rate was between 92% and 95%.

The civil areas managed by the Delhi Cantonment Board have also remained close to 90%. In comparison, the MCD recorded 56% segregation in 2023-24, rising only slightly to 59% in the following year. The contrast indicates that high segregation levels can be achieved where collection systems, public awareness and enforcement are more closely monitored.

Ward data shows uneven progress

Figures from MCD wards show that progress is far from uniform. In 2022-23, only 12 of the city’s 250 wards reported 100% waste segregation. Around 70 wards achieved rates between 80% and 100%, showing that several localities have developed better systems.

However, many wards remained well below the desired level. Twelve wards recorded segregation between 60% and 80%, while 81 were in the 40% to 60% range. Another 46 wards were between 20% and 40%, and 29 wards reported rates of only 10% to 20%.

This uneven performance affects the city’s ability to manage waste efficiently. Food scraps and other organic material become unsuitable for composting or bio-methanation when mixed with plastic, wrappers and dry waste. Recyclable items also lose value after contamination, increasing the cost of recovery.

Processing capacity still falls short

Delhi has expanded its waste treatment infrastructure, but mixed garbage continues to limit results. The share of waste processed increased from 52.8% in 2018-19 to 64.2% in 2025. Despite this improvement, a substantial amount of waste still remains outside the treatment system.

In 2025, Delhi processed about 7,611 tonnes out of the 11,852 tonnes generated daily. More than 4,200 tonnes were left untreated each day. In 2024, the city processed 66.5% of its daily waste generation of 11,342 tonnes, while the remaining 33.5% was dumped or sent to landfill sites.

Waste-to-energy plants are also affected by poor segregation. Mixed municipal waste often contains high moisture and organic content, which can reduce combustion efficiency. While such facilities may help reduce waste volume, they cannot replace the need for proper sorting at the household and commercial level.

Landfills reflect years of mixed disposal

Delhi’s landfill sites at Bhalswa, Ghazipur and Okhla illustrate the long-term cost of untreated mixed waste. Authorities are using bio-mining to excavate and separate old garbage into recyclable, combustible and inert material.

Bhalswa has completed around 96% remediation, while Okhla has processed about 88% of its legacy waste. Ghazipur remains the largest concern, with only 20% of its old waste processed. The site contains nearly 140 lakh tonnes of legacy waste, accounting for almost half of Delhi’s total landfill burden.

Target set for full segregation

The MCD has set January 2027 as the target for achieving 100% source segregation. It has also identified 633 zero-waste colonies where residents are following segregation and in-house composting practices.

Scaling up these efforts will require consistent door-to-door collection, stronger enforcement, public participation and greater involvement of informal waste workers. Unless segregation improves at the point where waste is generated, Delhi’s treatment plants and landfill remediation efforts will continue to face avoidable pressure.