Combination of TiO2-photocatalytic process and biological oxidation for the treatment of textile wastewater

Combined photocatalytic and biological process for textile wastewater treatments

“…As already mentioned, there are few studies that associate these two technologies for textile dye decolorization in the presence of additives. Nevertheless, researchers who evaluated the two techniques achieved high color removal efficiencies, on the same order of magnitude as the present work (Ahmadi et al, ; Chen, Kuo, Yang, & Chung, ; Deveci et al, ).…”

“…The success of the combined processes with TiO 2 is because they are complementary: The photocatalytic treatment removes color and the bioprocess removes carbon, improving the wastewater quality (Padovan & Azevedo, ). In addition, the photocatalytic pretreatment may improve the biodegradation of textile wastewater, though change the structures of the components, as observed by Ahmadi et al ().…”

“…Despite research advances of combined AOP and biological treatments for decolorization of textile dyes, there are few studies associating heterogeneous photocatalysis and bioprocess for treating solutions containing dyes and additives usually present in this type of waste (Ahmadi, Amiri, & Amiri, ; Deveci, Dizge, Yatmaz, & Aytepe, ). Different combinations of chemical oxidation methods and biological methods have been described by Holkar, Jadhav, Pinjari, Mahamuni, and Pandit () in a critical review on textile wastewater treatments.…”

“…Ahmadi et al () investigated the combination of AOP followed by biological process to remove color and COD from wastewater obtained from a textile plant in Iran—chemical oxygen demand (COD) ≅ 1,650 mg O 2 L −1 and color (absorbance at 335 nm) ≅ 0.81 a.u. In this case, photocatalytic pretreatment with TiO 2 /UV of the wastewater enhances the subsequent biodegradation using aerobic moving bed biofilm reactor (MBBR), reaching 79% and 87% for COD and color removal, respectively.…”

Performance and kinetic modeling of modified attached-growth anoxic-oxic-anoxic reactor for onsite sanitation system treating septic tank effluent

“…Table 3 comparison of the kinetic coefficients of various types of the attached-growth reactor. The μ max and K B for COD removal of this study were relatively higher than other studies such as up-flow anoxic-aerobic sludge reactor [13], up-flow aerobic-anoxic sludge bed reactor [24], integrated anaerobic-aerobic reactor [25], up-flow aerobic anoxic sludge fixed film [7], moving bed biofilm reactors [5,[26][27][28], biofilm processes [10,29], modified septic tank system [29], anaerobic-anoxic-aerobic moving bed bioreactors [20], and integrated rotating biological contactor-activated sludge system [31]. However, the values of μ max, and K B in this study were lower than those of the down-flow hanging sponge bioreactor by Nga [32], probably which used lower strength wastewater in their studies.…”