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Sri Lanka

Promotion of biogas plants to prevent water pollution and to generate clean energy

About the Implementing organization

Name: Human and Environment Development Organization (HEDO)

Country: Sri Lanka

Year of establishment: 2006

Type of organization: Legally recognized non-profit status


The waste water released from the rubber latex cleaning and coagulation process (Serum), which is slightly acidic are directly discharged without any cleaning and gets accumulated in the open land or in nearby streams and produce gases with extreme odors. As a result of this project, this hazardous waste water is now used as biogas for cooking purposes and the remaining water is released after biological distillation. A simple modification has been done inside the digester which enabled it to efficiently digest acidic waste water. Two model bio gas plants having capacities of 8 & 10 cubic meters were constructed at two homesteads. One of the two biogas plants built through the project helps to prevent pollution of habitats of a point endemic species Puntius bandula.

Nature Element


Type of Action

Protection / Pollution prevention, clean up

Sustainable Development Element

Renewable energy / Climate action

Related Sustainable Development Goal(s)


Environmental Impacts

Water pollution and air pollution due to the rubber effluents has been reduced by using bio gas plants. Since the point endemic critically endangered fish species Puntius bandula is in this vicinity, this project contributes in making the streams a conducive habitat. The sludge and purified water is used as a fertilizer in homesteads preventing the usage of chemical fertilizers.

Sustainable Development Impacts

A total of $1108.02 worth clean energy from waste saw dust and bio gas were provided to the project participants during October 2015 to September 2016. GHG released from fermentation the rubber effluents has been limited by the usage of biogas plants.


The biogas plants can be further developed so that they can be built with less cost. This will be helpful to upscale the project to the district level and to the national level.The NGO is now trying to find out the feasibility of using biogas in the rubber drying houses so that the drying houses could run on clean energy.


The innovative model of biogas plants has become very popular around the project area and many people have requested to build them in their premises. The NGO has plans to replicate this project with the support of Rubber Development Department in newly rubber grown areas of Sri Lanka as well. Awareness programmes and hands on experience programmes will be utilized to promote the modern technology.

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