Project description:

The project activity qualifies as Type III: Other project activities not included in Type I or Type II that result in GHG emission reductions not exceeding 60 KtCO2e per year in any year of the crediting period.

During the primary treatment of the wastewater of Cali, carried out in the WWTP-C, sludge composed of the organic matter susceptible to the decomposition is generated. The sludge is produced in eight sedimentation tanks and next carried into thickener tank. Later on sludge is redirected to four covered anaerobic digestion tanks (digesters) with the purpose of obtaining more stable end-product and eliminating pathogenic microorganisms present in the untreated sludge. The above mentioned anaerobic digestion, besides stabilizing sludge, generates biogas with high content of methane (between 57% and 64% according to the latest analyses undergone in WWTP-C 1).

The baseline scenario is the existing sludge treatment system without methane recovery and combustion.

This project category comprises measures that recover methane from biogenic organic matter in wastewaters by means of Introduction of methane recovery and combustion to an existing sludge treatment system.

The activity of the proposed Clean Development Mechanism (CDM) small-scale project involves the capture and high efficiency combustion of methane, present in biogas generated during the process of treatment of sludge in the Wastewater Treatment Plant – WWTP Cañaveralejo (further called WWTP-C) – located in Cali, Colombia.

Methane is burned in the internal high efficiency combustion engine of the electricity generation system.

This project advances the following United Nations Sustainability Development Goals:

Standard of issuance:


AMS-III.H. ver. 9 – Methane recovery in wastewater treatment

Amount of reduction:

56,632 tCO2/year

Service offered:



Wastewater management. CDM Post-Registration


June 2019