Sustainable Development Goal "Goal 11: Sustainable Cities and Communities" ile GSSET- Environmental Biotechnology Graduate Program - Master Degree'a göz atma
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ÖgeTreatment of textile wastewater using completely mixed anaerobic reactor: Start-up(Fen Bilimleri Enstitüsü, 2020) Bilgiç, Cenk Ali ; Arıkan, Osman Atilla ; 644357 ; Çevre BiyoteknolojisiThe textile industry is one of the major industries for many countries and it is developing day by day. In the textile industry, mainly fiber is turned into yarn, and yarn turns into a fabric that is used to manufacture end products such as clothes, curtains, towels and etc. and most of these end products are colored by dyes. The textile industry demands high water consumption because of processes applied. Dyes are the most important consumables for the textile industry. Consuming a high amount of water, dyes and other auxiliaries such as detergents, acids, inorganic salts and etc. make textile wastewater highly pollutant for the environment. Textile wastewaters contain a high amount of chemical oxygen demand (COD), total suspended solids (TSS), color, etc. and it is possible to say that COD and color removals are the main criteria researchers focus on. Because of its environmental impacts, regulations, and discharge criteria, demand for searching more feasible, cheaper, or more effective solutions has been increasing lately. There are many approaches for the treatment of textile wastewaters, such as physicochemical, biological or combined processes. Physicochemical systems effluents do not meet discharge limits alone although their investment costs are low. Due to the suitability of anaerobic processes for high COD containing wastewaters, these systems can easily be applied for the textile industry. Moreover, anaerobic systems have some additional advantages such as energy recovery. In addition to this, it is possible to reuse textile wastewater in case of applying well designed combined biological and physicochemical systems. The purpose of this study was to investigate the treatability of synthetic textile wastewater by using pilot-scale anaerobic completely stirred tank reactor (CSTR) which was operated at mesophilic conditions (35°C) and infinite sludge age. However, technical and operational problems were occurred at the beginning of the study. For this reason, only the results of the start-up part was presented. Total duration of study was 264 days. The inoculum was supplied from Atakoy advanced biological wastewater treatment plant of Istanbul Water and Sewerage Administration (ISKI). The study was conducted in two phases. The first phase was operated for 81 days to investigate COD removal of synthetic textile wastewater which has an average of 2.400 mg COD/l initial concentration with 24 h HRT. The average COD removal was ~54% of the first phase. The second phase was investigated under two periods by using similar synthetic wastewater which has an average 875 mg COD/l and 975 mg COD/l for phase two/period one and phase two/period two, respectively. The first period of this phase was operated for 93 days with 24 h HRT and ~45% average COD removal was reached at this period. Moreover, the second period of this phase was run 90 days with 48 h for HRT and ~86% average COD removal was reached. The average pH was around 6,9 and average MLSS concentration was in between 2.500-3.000 mg/l during the study. At the last period (phase two/period two) of the study, average MLVSS/MLSS ratio was calculated as 0,62 and 86% COD removal was achieved. This COD removal efficiency is comparable with literature.