Recycle in upflow anaerobic sludge blanket reactor on treatment of real textile dye effluent

Abstract

The discharge of textile wastewater containing dye in the environment is varying for both toxicology and esthetical reasons as dyes impede light penetration, damage the quality of the receiving streams. Upflow anaerobic sludge blanket reactor with anaerobic digester sludge treating starch wastewater has been used to investigate the removal efficiency of chemical oxygen demand (COD) and colour of textile dye wastewater. In this study, the starch and textile dye wastewater was mixed at 70 and 30%, respectively, and the experiments were carried out with recycle of treated wastewater at different percentage as 10, 20, 30 and 40. Maximum removal of COD and colour was 96% and 93.3%, respectively, at 30% recycle. At various OLR and HRT, the maximum removal of COD, colour was 95.9%, 93% at 6.81 kg COD/m 3 d and 96%, 93% with 24 h of HRT. The maximum production of biogas at 24 h of HRT with 30% recycle was about 355 l/d. The Volatile fatty acid/Alkalinity ratio of methanogenic reactor was found to be 0.049-0.053. The result provided evidence, the starch and dye wastewater have wide variation in their characteristics was treated on combination, this new technology supports the effective utilization of starch waste in destruction of dye.

Методы Удаления Пигментов Из Сточных Вод

“…G. Gnanapragasam и др. [59] изучали очистку текстильных сточных вод в иловом реакторе выше по течению. При 6,81 кг ХПК/м 3 /сут.…”

Reduction of azo dyes by anaerobic bacteria: microbiological and biochemical aspects

“…It is important to mention that hydrolytic and fermentative bacteria may play an important role during the anaerobic treatment of textile wastewaters because this kind of effluents contain different polymers, such as starch, which are utilized during the production of fabrics (Dos Santos et al 2006a). In fact, high decolourisation efficiencies have been achieved in anaerobic bioreactors in which starch and carboxymethyl cellulose have been used as energy source (Isik and Sponza 2008;Gnanapragasam et al 2010). Recent experiments documented in detail the role of glucose-fermenting bacteria on the reductive decolourisation of azo dyes.…”

Influence of hydraulic retention time in a two-phase upflow anaerobic sludge blanket reactor treating textile dyeing effluent using sago effluent as the co-substrate

“…Biogas production in relation to COD is about 0.4 m 3 /kg COD removed, corresponding to a methane production of 0.35 m 3 CH 4 per kilogramme of COD removed. Biogas production is directly related to COD stabilization, for example without biogas production minimal COD removal occurs (Grady et al 1999). Gnanapragasam et al (2010) had reported the maximum production of biogas was about 355 L/day at 24 h of HRT by recycling the treated wastewater.…”