East Kolkata Wetlands: Sewage-Fed Fisheries Treating Kolkata's Wastewater
India
A 125 km² Ramsar wetland east of Kolkata where cooperative fisheries treat ~910 million litres of the city's sewage daily, …
China · Beijing · See the China profile · See the Beijing profile
Top 80% 33/100 · Ask Evidence Copilot about this practice
In 2023 Beijing recycled 1.28 billion m³ of wastewater — nearly 30% of total water consumption — with 1.18 billion m³ returned to rivers, lakes and wetlands, per Beijing Water Authority figures reported by state media.
Beijing, a historically water-stressed capital, has built up large-scale wastewater reclamation infrastructure as part of its water-supply strategy alongside the South-to-North Water Diversion project. According to the Beijing Water Authority, reported via Xinhua and the State Council's gov.cn, the city recycled 1.28 billion cubic metres of water in 2023.
Of that total, 1.18 billion cubic metres — the large majority — was used for 'ecological and environmental purposes', replenishing rivers, lakes and wetlands, while recycled water separately accounted for over 30% of water consumption in the industrial and sanitation sectors. Overall, reclaimed water met nearly 30% of Beijing's total water consumption in 2023, a figure both outlets describe as a record high that has made recycled water the city's stable 'second water source'.
These figures come from the Beijing municipal water authority via state media and were not independently audited in the sources reviewed. No ecological-outcome monitoring data (for example, measured changes in wetland health or species presence) accompanying the ecological-replenishment claim were found, so the stated ecological benefit, while plausible given the volumes involved, is only partially evidenced.
Read the full analysis: https://english.news.cn/20240926/101b89d32ccd45fca182796127f24077/c.html
Implementation detail (cost, timeline, staffing, conditions for success) is not yet available for this practice.
Do you run this practice? Claim it — verified implementers get a public contact pathway and can propose corrections.
Where this practice's information was retrieved from, and when.
India
A 125 km² Ramsar wetland east of Kolkata where cooperative fisheries treat ~910 million litres of the city's sewage daily, …
China
A 14-hectare former steel-mill and shipyard on Shanghai's Huangpu River was rebuilt as a 1-mile constructed wetland that biologically treats …
India
A ~12,500-hectare Ramsar wetland east of Kolkata has informally treated the city's sewage since the 1930s through ~254 fish ponds, …
Uganda
A papyrus wetland once filtered up to 99% of faecal coliforms from Kampala's wastewater before Lake Victoria, valued at US$1,500–2,900/ha/year …
Open full copilot Grounded in cited practices — always check the sources.