(Feature Image: The NTU research team behind the solar-powered method to convert sewage sludge into green hydrogen and animal feed. Source: Science Tech Daily)
On the occasion of World Water Day 2025, SANDRP compiles ten studies and research papers revealing the various cost effective and efficient methods to treat sewage and recover nutrients from sewage sludge. The first part of the series highlights water efficient practices being adopted by farming communities in India and the second part covers the water sources conservation efforts being made by the rural communities in the country. The third part has focused on sewage treatment and rainwater harvesting efforts being made in various cities in the country.
Wetlands are critical part of hydrological systems. They provide multiple ecological services to people living in proximal areas. The invisible contribution of wetlands in saturating aquifers and checking groundwater depletion is essential given the growing water scarcity. Additionally, wetlands are home to a variety of plants and animals species making them fully functional and self-sustaining eco-system. Despite the environmental significance and associated support services, wetlands have been subjected to degradation for past many decades.
As part of annual exercise, SANDRP is presenting overview on the status of wetlands over past one year. The overview focuses on incidents of abuse and threats to wetlands across the country. The report also highlights the details of central and state governments’ initiatives and administration actions taken aiming at wetlands protection. Apart from this, there is attempt to throw some light on judicial intervention and ongoing court cases regarding wetlands conservation.
This week there are exemplary and encouraging wetlands revival stories from three metro cities of Chennai, Hyderabad and Delhi. In the first example from Hyderabad, meticulously chosen plant species such as tulsi, aswagandha, citronella and hibiscus have been used to create an artificial island to clean Neknampur Lake. The treatment islands are composed of four layers of which the bamboo base keeps the entire structure afloat. Based on soil-less hydroponics, these floating treatment wetlands absorb excess nitrates, thereby reducing the chemical content of the lake water. Microorganisms present in the wetland break down organic matter while the root systems filter out pollutants and sediments. https://www.thenewsminute.com/article/3500-saplings-floating-islands-help-rejuvenate-hyd-neknampur-lake-75819 (The News Minute, 3 Feb. 2018)
Image by: Madhulika Choudhary
Similarly, Chennai-based Care Earth Trust along with the public works department (PWD) and the civic body has managed to restore three urban lakes. While many of the smaller wetlands have vanished over time, many mid-sized wetlands seem to have shrunk by almost 65 percent. Thanks to their joint effort, invasive hyacinth was removed from the Narayanapuram Lake in Pallikaranai, while sewer lines, which emptied into the Perungalathur Lake, have now been plugged. A detailed restoration proposal has been forwarded to the PWD regarding the Korattur-Madhavaram-Ambattur lakes. https://timesofindia.indiatimes.com/city/chennai/hyacinth-out-sewer-line-plugged-three-water-bodies-restored/articleshow/62748110.cms (The Times of India, 2 Feb. 2018)
Meanwhile, Delhi Jal Board (DJB) has taken up interesting new project of creating an artificial lake in Dwarka. The project will supply water in sub-city and improve ground water level too. DJB has approved Rs. 56 crore for the project which will be completed in next seven months. This would the first model project wherein a lake will be used to augment water supply. The special lake is being created next to the Dwarka water treatment plant (WTP) will have a sand bed to allow maximum percolation of water into the ground. It will have a capacity of 10 million gallons (MGD). The project is expected to add supply of 5-6 million gallons water to Dwarka every day.
SANDRP 