Determination of Biological Treatability Processes of Textile Wastewater and Implementation of a Fuzzy Logic Model

Harun Akif Kabuk,Yasar Avsar,Fatih Ilhan,S Levent Kuzu,Kubra Ulucan

doi:10.1155/2015/716853

Abstract

This study investigated the biological treatability of textile wastewater. For this purpose, a membrane bioreactor (MBR) was utilized for biological treatment after the ozonation process. Due to the refractory organic contents of textile wastewater that has a low biodegradability capacity, ozonation was implemented as an advanced oxidation process prior to the MBR system to increase the biodegradability of the wastewater. Textile wastewater, oxidized by ozonation, was fed to the MBR at different hydraulic retention times (HRT). During the process, color, chemical oxygen demand (COD), and biochemical oxygen demand (BOD) removal efficiencies were monitored for 24-hour, 12-hour, 6-hour, and 3-hour retention times. Under these conditions, 94% color, 65% COD, and 55% BOD removal efficiencies were obtained in the MBR system. The experimental outputs were modeled with multiple linear regressions (MLR) and fuzzy logic. MLR results suggested that color removal is more related to COD removal relative to BOD removal. A surface map of this issue was prepared with a fuzzy logic model. Furthermore, fuzzy logic was employed to the whole modeling of the biological system treatment. Determination coefficients for COD, BOD, and color removal efficiencies were 0.96, 0.97, and 0.92, respectively.

Highlights

Due to their highly colored substance ingredient and hardly treatable characteristic, treatment studies on textile wastewater remain at the top of densely studied topics
The main aim of this study is to display the biological treatability of the textile wastewater having low biodegradability and investigate its treatability by an membrane bioreactor (MBR) system
The focus of the study was MBR process and MBR application lasted for 81 days

Summary

Introduction

Due to their highly colored substance ingredient and hardly treatable characteristic, treatment studies on textile wastewater remain at the top of densely studied topics. Textile wastewater has nonbiodegradable characteristics [1,2,3]. Textile wastewater is treated by chemical treatment techniques which are expensive and need many chemical applications [4, 5]. Due to the fact that textile industry effluents have a wide variety of pollutant parameters, diverse treatment techniques are required. Used treatment processes, considered to be conventional chemical treatment methods, are used to remove COD and color. Hydroxyl radicals occur as a result of using those kinds of oxidants and decompose the structure of refractory or resistive organics [6,7,8]

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