Abstract
This paper assesses the potential environmental effects of the optimization of the kitchen waste management in Opole. The separate collection of kitchen waste is improved by distribution of separate collection kits consisting of an in-home bin and 10 L biodegradable bags. The surplus of collected kitchen waste is diverted from treatment in a mechanical-biological pretreatment (MBP) along with the residual waste to anaerobic digestion (AD) with the biowaste. This has positive effects on European and Polish goals, ambitions, and targets, such as (i) increasing the level of renewables in the primary energy supply, (ii) decreasing the level of greenhouse gas (GHG) emissions, (iii) increasing the level of preparation for reuse and recycling of municipal waste. The environmental effects of 1 ton additionally separately collected and treated kitchen waste are determined by using life cycle assessment. It was shown that in all selected impact categories (global warming potential, marine eutrophication potential, acidification potential, and ozone depletion potential) a clear environmental benefit can be achieved. These benefits are mainly caused by the avoided emissions of electricity and heat from the Polish production mix, which are substituted by energy generation from biogas combustion. Optimization of the waste management system by diversion of kitchen waste from mechanical-biological pretreatment to anaerobic digestion can lead to considerable saving of 448 kg CO2-eq/t of waste diverted. With an estimated optimization potential for the demonstration site of 40 kg/inh·year for the city of Opole, this would lead to 680,000 t CO2-eq savings per year for the whole of Poland. The sensitivity analysis showed that with a choice for cleaner energy sources the results would, albeit lower, show a significant savings potential.
Highlights
The ambition of the European Union when it comes to making the energy sector greener is strongly evolving; from the 20-20-20 target for 2020 over intermediate goals of a share of at least 27% of renewable sources in the EU-wide electricity production and 32%for the overall primary energy supply by the year 2030 [1,2,3,4]
The potential effects of treatment in both cases are shown for the considered impact categories: global warming potential (GWP), marine eutrophication potential (MEP), acidification potential (AP), and ozone depletion potential (ODP)
The optimization of the collection and treatment of kitchen food waste has a positive effect on the environment
Summary
The ambition of the European Union when it comes to making the energy sector greener is strongly evolving; from the 20-20-20 target for 2020 over intermediate goals of a share of at least 27% of renewable sources in the EU-wide electricity production and 32%for the overall primary energy supply by the year 2030 [1,2,3,4]. The ambition of the European Union when it comes to making the energy sector greener is strongly evolving; from the 20-20-20 target for 2020 over intermediate goals of a share of at least 27% of renewable sources in the EU-wide electricity production and 32%. For the greenhouse gas (GHG) emissions, the ambition is even higher with a planned increase of the 2030 reduction target of 40% to 55% compared to the 1990 level. As a keystone within the European Green Deal the Circular Economy Action Plan was launched [7]. Central goal is striving to reuse and circulation of the material content products and packaging after their (first) use phase. This refers both to organic and nonorganic materials. Part of the Circular Economy Action Plan is the development of an Integrated Nutrient Management Plan, which should ensure, among others, enhancing the recovery of nutrients [7]
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