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    Biomining - biotechnological systems for the extraction and recovery of metals from secondary sources
    (Global Network Environmental Science & Technology, 2018) Kucuker, M. A.; Kuchta, K.
    Biomining is the common term used to define processes that utilize biological systems to facilitate the extraction of metals from ores. Nowadays, a biomining concept can be defined as a two stage combined biological systems (1st stage bioleaching and 2nd stage biosorption) in order to perform the extraction and recovery of the metals from secondary sources such as industrial and mining waste, waste electrical and electronic equipment (WEEE), bottom ash and end of life vehicles. Overwhelming demand and limited sources of metals have resulted in searching new sources so that attentions have been shifted from mining process towards recycling of secondary resources for the recovery of metals. There are several metallurgical processes for metal recovery from the secondary sources such as pyrometallurgical processing, hydrometallurgical and bio/hydronnetal-lurgica I processing. Biomining processes are estimated to be relatively low-cost, environmentally friendly and suitable for both large scale as well as small scale applications under the bio/hydrometallurgical processing. Thus, the process involves physical separation (pre-treatment) and biomining (bioleaching and biosorption) and hydrometallurgical processes for recovery of base metals, rare earth elements (REEs) and precious metals from e-waste was evaluated.
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    Öğe
    Enhanced biogas production from chicken manure via enzymatic pretreatment
    (Springer, 2020) Kucuker, M. A.; Demirel, B.; Onay, T. T.
    Livestock production residues are commonly used as substrates in agricultural biogas plants for energy recovery. Cattle and poultry manure can be converted to biogas in farm-scale or centralized biogas plants to produce heat and power. This study investigated batch anaerobic digestion of chicken manure coupled with a biological pre-treatment step. The primary objective of this laboratory-scale work was to improve the biological degradability of the mono substrate to obtain higher biogas and methane yields through using an enzymatic pre-treatment. The experimental results showed that the enzymatic pre-treatment for the chicken manure significantly increased the biogas production by about 35% in comparison to the control without enzymatic pre-treatment. Therefore, it can be concluded that the enzymatic pre-treatment of chicken manure could provide improved biogas and methane yields when the chicken manure is used as mono substrate for anaerobic digestion in agricultural biogas plants.