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Efekt badań statutowych
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Finansowanie:
This work was financially supported within the statutory research of particular scientific units under
subvention for a science program.
The improvement of energy efficiency ensuring high nutrients removal is a great concernfor many wastewater treatment plants (WWTPs). The energy balance of a WWTP can be improvedthrough the application of highly efficient digestion or its intensification, e.g., through the introductionof the co-substrates with relatively high energy potential to the sewage sludge (SS). In the presentstudy, the overview of the energetic aspect of the Polish WWTPs was presented. The evaluation ofenergy consumption at individual stages of wastewater treatment along with the possibilities of itsincreasing was performed. Additionally, the influence of co-digestion process implementation on theenergy efficiency of a selected WWTP in Poland was investigated. The evaluation was carried outfor a WWTP located in Iława. Both energetic and treatment efficiency were analyzed. The energybalance evaluation of this WWTP was also performed. The obtained results indicated that the WWTPin Iława produced on average 2.54 GWh per year (7.63 GWh of electricity in total) as a result of theco-digestion of sewage sludge with poultry processing waste. A single cubic meter of co-substratesfed to the digesters yielded an average o.f 25.6±4.3 Nm3of biogas (between 18.3 and 32.2 Nm3/m3).This enabled covering the energy demand of the plant to a very high degree, ranging from 93.0% to99.8% (98.2% on average). Importantly, in the presence of the co-substrate, the removal efficiency oforganic compounds was enhanced from 64% (mono-digestion) to 69–70%.
