INFLUENCE OF THE APPLIED ORGANIC LOAD (OLR) ON TEXTILE WASTEWATER TREATMENT USING SUBMERGED ANAEROBIC MEMBRANE BIOREACTORS (SAMBR) IN THE PRESENCE OF REDOX MEDIATOR AND POWDERED ACTIVATED CARBON (PAC)

B E L Baêta,S Queiroz Silva,D R S Lima,S F Aquino

doi:10.1590/0104-6632.20160334s20150031

B E L Baêta, S Queiroz Silva + Show 2 more

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https://doi.org/10.1590/0104-6632.20160334s20150031

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Abstract

Abstract - This paper evaluated the treatment of textile wastewater in submerged anaerobic membrane bioreactors (SAMBR) operated on a bench scale. Particularly, the influence of operational conditions, such as the applied organic rate (OLR) and the dilution factor (for toxicity attenuation) of the textile wastewater, was evaluated on color and organic matter removal. In addition, the effect of powdered activated carbon (PAC) on SAMBR-1 and the addition of yeast extract (source of the redox mediator riboflavin) were also investigated. The results showed that reducing the textile wastewater dilution factor from 10× (phase 1) to 4× (phase 2) and 0× (no dilution) decreased the COD and color removal efficiencies in both SAMBRs, probably due to an increase in the toxic load. Nevertheless, PAC adsorbed toxic compounds found in the textile wastewater and helped biomass acclimatization, which led to higher COD and color removal efficiencies in SAMBR-1. The presence of yeast extract enhanced color removal efficiencies 3-fold in both SAMBRs when they were fed with undiluted textile wastewater.

Highlights

AND RELEVANCEDuring their productive processes, textile industries consume large quantities of water and thereby generates high amounts of wastewater
By comparing the median chemical oxygen demand (COD) removal efficiency of submerged anaerobic membrane bioreactors (SAMBR)-1 of 88.6%, 51.6% and 43.3% in phases 1 (DF of 10×), 2 (DF of 4×) and 4, respectively and of SAMBR-2 of 78.3%, 50.7% and 44.9% in the respective phases 1, 2 and 4, it is possible to see that the decrease in dilution factors (DF) caused a reduction in the SAMBR performance
It is possible to see that in these phases the COD removal efficiencies were higher in SAMBR-1

Summary

Introduction

Textile industries consume large quantities of water and thereby generates high amounts of wastewater. Textile effluents are characterized by being impactful to the environment, exhibiting high color and moderate biodegradability due to the presence of dyes that did not. Textile dyes damage the environment and pose a threat to human health, since some of them or their byproducts are known carcinogenic or mutagenic compounds (Kalyuzhnyi and Sklyar, 2000). It is estimated that there are more than 3,000 types of dyes and that the azo type, characterized by the presence of one or more –N=N- bond, represents ~70% of the colorants commercialized worldwide (Hunger et al, 2004)

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