Sewage Treatment at “HUDIARA DRAIN” by Floating Wetlands

Punjab Municipal Development Fund Company

The Hudaira Drain Floating Wetlands and Aeration Project is an environmental rehabilitation initiative planned for Lahore to improve water quality and environmental conditions along the Hudaira Drain. The project covers a drain stretch of 500 m, equivalent to 1,640 ft, and is designed to address long standing issues related to foul odor, stagnant water and pollution. The project is scheduled for implementation over a duration of 3 months from October 2025 to December 2025 with an estimated cost of PKR 30.3 million.

The project involves installation of 8 floating wetland beds, each measuring 24 ft by 100 ft, along with deployment of 6 aerators to improve dissolved oxygen levels in the drain. Solarization for operating the aerators will be carried out by the University of Lahore. The intervention aims to reduce production of harmful gases such as hydrogen disulphide H2S and methane CH4, lower biochemical oxygen demand and chemical oxygen demand levels by approximately 30 percent to 35 percent, reduce mosquito breeding and transform the drain banks into landscaped green belts with walking trails for public use.

The scope of work includes installation of RCC columns and anchoring systems on both sides of the drain to prevent drifting of floating wetlands and aerators. Indigenous plant species including Phragmites australis, Typha domingensis and Cana indica will be used in the floating wetlands, with plant roots extending up to 6 ft to act as natural biofilters. These roots will clean water through filtration, adsorption and absorption while supplying oxygen and creating habitats for birds. The project represents an innovative nature based solution to urban water pollution and environmental degradation in Lahore.

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