IJSRSET1849130 | Received : 10 August 2018 | Accepted : 25 August 2018 | July-August-2018 [ 4 (9) : 525-533 ] © 2018 IJSRSET | Volume 4 | Issue 9 | Print ISSN: 2395-1990 | Online ISSN : 2394-4099 Themed Section : Engineering and Technology 525 Treatment of Polluted Aqueous Solutions with different types of Dyes by Eggplant Peels Accessing to Zero Residue Levels Mohammed Nsaif Abbas 1 , Firas Saeed Abbas 1* , Thekra Atta Ibrahim 2 1* Environmental Engineering Department, Mustansiriyah University, College of Engineering, Baghdad, Iraq 2 Department of Biology, Diyala University, College of Education for Pure Science, Diyala, Iraq ABSTRACT This paper is related to study the potential of eggplant peel (EP) to remove nine types of dyes (which were acid orange, brilliant green, Congo red, crystal violent, direct black, direct brown, indigo carmine, methylene blue, and yellow dye) from simulated synthetic aqueous solutions (SSAS) using immobilized Polyphenol Oxidase (PPO) enzyme extracted from EP and adsorption process. Results show high ability of PPO to remove dyes with an efficiency reach to 99%. The residue from PPO extraction from EP was investigated to remove the same dyes as adsorbent media. Higher removal efficiency were (93.15, 95.25, 92.55, 94.75, 92.85, 94.65, 90.25, 91.35 and 93.40)% for acid orange, brilliant green, Congo red, crystal violent, direct black, direct brown, indigo carmine, methylene blue, and yellow dye respectively. Keywords : Eggplant Peel, Dyes, PPO, Adsorption, Residue and ZRL I. INTRODUCTION Several metiers predominantly employ dyes and tinctures to tint their manufactures, like food, textile and lather industries, biological research, paper production, photochemical cell, hair colourings, etc. [1]. Most dyes are apparent in aqueous systems at very minimum concentrations nearly (1 mg.l-1). Between (10-200 mg.l-1) is the range of the concentration of dyes in the wastewaters produced from textile industries. Defilement due to the use of dyes may compose a serious risk because of the enormous amount release. The discharge of the wastewaters of dyes to the open waters may present hazardous problems. In addition to the undesirable aesthetic problems to the water user, the International Agency for Research on Cancer (IARC) has categorized many kinds of dyes like benzidine as being related with the cancer in humans [2]. The treatment of wastewaters effluents produced from textile industries using classical chemical, physical and biological methods are very difficult issue. Adsorption technology may be an effective method for treating different types of water pollutants like odours, suspended solids, oil, and organic matter [3]. The most widely adsorbent used in adsorption method was activated carbon due to its ability to adsorb many metallic ions and organic matters, but it’s used is decreased now day because the expensive cost required. So, cheaper materials instead of activated carbon must be found [4]. Many substitutes like rice husk, sugarcane bagasse, fly ash, sludge ash, bituminous coal, maize cob, coconut shell, wheat straw, cotton waste, groundnut shell, and orange peel have been proposed as an adsorbent for various types of dyes [5-14]. The aim of this investigation is to test the ability of using Eggplant Peel wastes in two ways for adsorption removal of various dyes which are acid orange, brilliant green, Congo red, crystal violent, direct black, direct brown, indigo carmine, methylene blue, and yellow dye from