1. REVALORIZATION OF FOOD INDUSTRY WASTE
3rd Metallurgical & Materials Engineering Congress of South-East Europe 2017
REVALORIZATION OF FOOD INDUSTRY WASTE
Zorica Lopičić1, Tatjana Šoštarić1, Jelena Milojković1, Jelena Petrović1, Marija Mihajlović1, Marija Petrović1, Mirjana Stojanović1
1Institute for Technology of Nuclear and Other Mineral Raw Materials
Abstract
Various industries produce and discharge waste containing different heavy metals into the environment, which presents serious threat both to environment and human health. Most commonly used techniques for removing heavy metals from wastewater have certain limitations which have induced necessity for developing low-cost processes. Application of cheap and abundant low-cost polymers in sorption process represents one of the promising techniques for heavy metal removal, especially at its low concentrations.
On the other hand, worldwide depleting of non-renewable energy sources are causing a serious economic and environmental threats, leading to intensive research and investments in renewable resources. The most important source of renewable energy in Serbia represents biomass, where almost half of this potential is agricultural and industrial waste. Most of these wastes are disposed at open landfills with negligible revalorization. On the other hand, electricity production in the Republic of Serbia is still based on the combustion of low – rank domestic coals in thermal power plants and utilization of available hydro potential.
Peach (Prunus persica L.) has an important role in Serbia’s fruit production with average annual production in 2016 of t that generates more than t peach stone (PS) waste. This kind of lignocellulosic waste has been proven as renewable source of many chemicals, components and biofuels.
For all the reasons previously described, the authors have investigated the possibility of application of this cheap, wasted material from food industry in sustainable manner-first as heavy metal sorbent and later as fuel based on energy renewable source. For this purpose, sorption experiments with different heavy metals (Cu, Pb, Zn, Cd) were conducted, and after desorption process, the exhausted sorbent was thermally degraded. Sorption and energetic characteristic were investigated using FTIR, SEM and TG techniques. Obtained equilibrium results confirmed possible application of this waste material as a heavy metal sorbent, while the kinetic parameters calculated from thermal degradation results, confirmed its possible application as a fuel.
Keywords: heavy metals pollution, sorption, desorption, thermal degradation, fuel
Conclusions
The FT-IR, SEM and TGA analysis have approved following:
the presence of the functional groups: carbonyl, carboxyl
and hydroxyl that acted as the binding sites for Cu sorption
sorption equilibrium data showed satisfactory capacity (12.73 mg/g)
multilayer porous structure which are favorable for ions diffusion
thermal decomposition data confirmed the lignocellulosic composition of the PS and its thermal stablity, indicating that this material have properties which are beneficiary for fuel application
Key objectives of this paper are to investigate the possibility to apply bio based waste material as a heavy metal sorbent and later as a fuel. This would improve environment quality by avoiding waste landfilling, reducing GHG emissions, increasing the implementation of renewable energy sources, keeping the quality and the availability of clean water and promoting a more sustainable and healthy way of life
Acknowledgements: These results are part of the project supported by the Ministry of Education and Science of the Republic of Serbia, TR 31003: “Development of technologies and products based on mineral raw materials and waste biomass for protection of natural resources for safe food production”
4th ICSD 2016 Poster Number