Abstract
This paper aims to present municipal sewage sludge (MSS) elementary analysis and energetic potential based on measurement of heat of combustion (higher heating value HHV) and calculation of calorific values (lower heating value LHV). The analysis takes into the consideration water content in sewage sludge, at different utilization stages, in wastewater treatment plants in Gdańsk Wschód and Kościerzyna – Pomeranian Voivodeship. The study yielded the following results (in % dry matter): ash 19÷31 %, C - 31÷36 %, H - 5÷6 %, N - 4÷6 %, O - 28÷32 %, S – 1 %. Calorific value of stabilized sludges in Gdańsk was on average 13.8÷15 MJ/kg. In case of sludges not undergoing digestion from Kościerzyna WWTP, the calorific value was at the level of 17.5 MJ/kg. Thus, sewage sludges are good energy carriers. High water content though is the problem, as it lowers the useful effect of heat. There is no alternative for thermal sewage sludge neutralization, which is in conformity with valid Polish National Waste Management Plan (KPGO 2022).
Highlights
Sludge production is directly connected to the sewage treatment
The fuel is composed of the combustible substance consisting of chemical compounds of elementary carbon (C), hydrogen (H) and sulphur (S), as well as mineral substances and moisture
Solid fuels are characterized by a series of indicators, such as heat of combustion HHV (MJ/kg), calorific value LHV (MJ/kg), ash content (%), sulphur content (%)
Summary
Sludge production is directly connected to the sewage treatment. Both, primary and secondary sludges, become putrescent. In case of sludges the principle can be fulfilled in two ways: by mass or energy recirculation
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