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Kubratovo wastewater
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Kubratovo wastewater

Located in Bulgaria, the project is both a methane emissions reduction and energy production project.Methane produced is captured in common methane tanks serving as a buffer and then supplied to the newly installed CHP gas engines for electricity and heat production.

Project type

Renewable energy


Project location



Gold Standard
Available vintages
220 947 tCO2
Available volumes
2021 - 2028
Crediting period


SDG Goal(s):

SDG Goal 6 - Clean Water and Sanitation
SDG Goal 11 - Sustainable Cities and Communities
SDG Goal 13- Climate Action

Project Image(s)

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Project description:

The project's main purpose is to transform the existing low tech sludge treatment process into a modern advanced treatment process matching the best sludge treatment practice available in Western Europe.

This transformation has a major effect on the environment by dramatically reducing the existing methane gas emissions at the plant while also reducing the volume of sludge (to as much as 50%) that needs to be transported;

The project's overall objective is to provide an environmentally friendly sludge treatment process reducing methane and carbon dioxide emissions that under a business-as-usual scenario –would have continued.

Other objectives are:

• Replace the traditional sludge drying beds and landfill options with mesophilic digestion of all primary and secondary sludge followed by mechanical dewatering in order to reduce GHG emissions;

• Effectively mitigate problems from the existing treatment of sludge and sludge liquors through the introduction of digestion;

• Production of fertilizer by mechanical dewatering of the digested stabilized sludge;

• Production of electricity from the utilization of the biogas in CHP gas engines thereby reducing GHG emissions from electricity production by the grid.

The project delivers the following key results:

• All primary and secondary sludge thickened and digested as per EU recommendations and guidelines;

• All biogas produced within the digestion process used for power and heat generation via CHP gas engines thus reducing on-site electricity purchases from the national grid;

• Reduction in on-site fossil fuel usage as all site-heating requirements will be met by the CHP gas engines;

• All sludge is stabilized and pathogen-free.

Long term strategic reductions of GHG emissions include:

• Reduction in open release of CH4 from open anaerobic sludge tanks and drying beds;

• Reduction in open release of CH4 from landfill disposal site;

• Reduction in CO2 emissions due to replacement of electricity production from fossil fuels;

• Reduction in CO2 emissions due to replacement of heat generation from fossil fuels.

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