Waste sorting at home a weak link in Swachh Bharat
Ten years after the Central government introduced the Swachh Bharat Mission (SBM) on October 2, 2014 as a flagship initiative to improve India’s solid waste management, a lack of segregation at source remains a major hindrance in realising the environmental and economic benefits of the mission, experts have said. In India, segregation at source was first introduced as a mandate as part of the Solid Waste Management (SWM) Rules, first notified by the ministry of environment, forests and climate change (MoEF&CC) in the year 2000, later in 2016, and subsequently in the SBM 2.0 guidelines in 2021. Sanitation being a state subject, the onus of implementation was on states and was eventually carried out by municipalities and other local bodies. However, the national capital continues to fare poorly on almost all waste management parameters — slow remediation of landfill sites, cleanliness of residential and market areas, as well as poor door-to-door waste collection. The Municipal Corporation of Delhi (MCD), the civic body for around 94% of the Capital’s geographical area, claims to have achieved 100% door-to-door waste collection and 55% waste segregation at source, but these numbers have been questioned by RWAs, experts and in some instances the mayor herself. During a Supreme Court hearing in July, it was revealed that 3,000 tonnes of unprocessed waste is daily dumped in Delhi, of the 11,000 tonnes of waste generated. The story is not rosy in other big cities either — Mumbai has a source segregation of 65%, with 49% of the waste processed, while in Bengaluru, 99% of the waste is segregated but only 81% is processed. Sectoral experts said despite reporting a high rate of segregation of waste, only a few cities have a robust system of sorting trash at source, or at the household-level itself. Thus, largely, solid waste is manually segregated by waste collectors at large centralised waste processing centres without following standard quality checks or worse mixed waste is dumped in mounting landfills, which makes regular headlines over public health risks. According to experts, the presence of mixed waste leads to undesirable outcomes such as waste-to-energy (WtE) plants running inefficiently and needing more fuel to incinerate waste, leading to both environmental and financial losses. More than 10 WtE plants across India have shut down due to economic infeasibility despite government subsidies since 1987, according to a study by Down to Earth. The ones that are running often are fined by pollution control boards or pulled up by courts over environmental concerns, they said. Further improperly segregated organic waste produces methane during composting—a more potent greenhouse gas than carbon oxides–just as unprocessed waste. Mixing plastics, glass, and synthetics in organic waste also produces compost that leads to poor soil health by stopping water percolation, gas exchange, and overall longer decomposition times. Worse, heavy metal contamination can lead to reduced crop growth and poses a threat to food safety. A study of compost samples from Delhi, Ahmedabad and Bengaluru by the Centre for Science and Environment (CSE) in 2023, showed that compost from various sites in Delhi and Ahmedabad contains high levels of pathogenic bacteria, heavy metal suggesting the need for better quality control. Swati Singh Sambyal, an independent waste management expert, said wherever segregation at source has been successful due to deep engagement between municipal officials and citizens involving community organisations, non-government actors and heavy investment in de-centralised waste management processing centres. But most big cities have models which are often inefficient, she said. In Delhi, the bulk of 8,000 tonnes of waste gets processed majorly via incineration-intensive technologies while the remaining is dumped in landfills. “This means a lot of money is spent on transporting waste which could otherwise be spent on biogas generation, recycling facilities. But in most big cities, most money is spent on collection and transportation alone,” she said.
