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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

Registry

Project location

Bulgaria

Certification

Gold Standard
2016-2019
Available vintages
220 947 tCO2
Available volumes
2021 - 2028
Crediting period

Certification(s):

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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