Browsing by Author "Tirsit Kiremt"

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    Tungsten-Based Activated Carbon Matrix for The Catalytic Oxidation of Volatile Organic Compounds (VOCS) In Leather Industries
    (Addis Ababa University, 2024-10) Tirsit Kiremt; Shegaw Ahmed (PhD)
    The term “leather waste water” refers to the liquid waste that tanneries produce as a consequence of tanning leather. Among the numerous components that made up effluents from tanneries, VOCs make the largest portion of it. VOCs are compounds that volatilize readily when exposed to air. Due to their volatility, these substances cause air pollution, water and soil contamination by the portion that rains and snowmelt can carry deep in to the soil. Because of this VOCs pose a threat to people, animal and plants. Thus it is important to identify the sources of VOCs, to characterize and treat them before releasing to the environment. In this VOCs treatment process catalytic oxidation is one of the effective procedure that may be used to remove VOCs. Generally the objective of this study was to investigate the catalytic degradation of VOCs from leather waste water using tungsten based activated carbon matrix. Tungsten based activated carbon matrix was prepared from rice husk. A Tiger SXT gas detector was used to investigate the VOCs found in leather effluent. Physico chemical characterization was performed using parameters like COD, TDS, TSS, density, ash content, PH, ORP and TOC. Instrumental characterization of tungsten impregnated catalyst was conducting using FTIR, XRD, EPR, TGA, DSC and SEM. The COD of the aerated sample was 35000 mg/L during the physical-chemical characterisation of leather waste (tannery waste), and it was reduced to 180 mg/L following tungsten treatment. In addition, the TOC in the aerated sample was reduced to 160 mg/L following treatment from 6460 mg/L. TDS concentration was 260 mg/L following treatment, whereas the parameter was 17000 mg/L in aerated water. This outcome was obtained with an optimal WACM of 3%. Following treatment, the lowering of the indicated parameters denotes a decrease in VOCs. In this investigation, water polluted with toluene, ethyl benzene, chlorobenzene, and LVOCS was produced in an optimal environment for catalytic oxidation. Regarding TOC, the relative VOC removal efficiencies were 80.5%, 85.5%, 80.9%, and 85.4% for toluene, ethylbenzene, chlorobenzene, and LVOCs.