Abstract
Waste effluents from textile industries, newspaper printing and photography contain residues of dyes and chemicals. Synthetic dyes present in water bodies, even at very low concentrations, can be extremely toxic to the living organisms due to cutting the development of bacteria and preventing the photosynthesis in aqueous flora. Acid Blue 25 (AB25) and Pigment Yellow 101 (PY101) are two types of azodyes which are toxic organic pollutants that consist of both N=N and C=C chromophoric groups. They cause considerable health effects being irritating to skin, eye and respiratory system and in some cases they may cause cancers. In this study, a biofilm of Aspergillus terreus supported on activated carbon was used as a biological tool for removal of these dyes from water body. The adsorption kinetics and contact time were determined along 240 minutes (30 minute interval). The initial concentration of dyes was 100 mg/L for each one. The biomass dosage was 1g / L. The optimum pH value for adsorption process was 3.0. The results depicted that the contact time for biosorption of both dyes was 180 min while adsorption kinetics of was quietly fitted with Pseudo second-order kinetics equation models. The maximum adsorption capacity was 82.3 and 78.2 mg/g for AB 25 and PY 101, respectively. Freundlich model was a good model for adsorption isotherm of two dyes on biofilm.
Highlights
The huge number of azodyes are widely produced annually
The strain Assiut University Mycological Center (AUMC)-050, activated carbons (AC) and Biofilm of AUMC-050 supported on AC were separately tested for biosorption of either Acid Blue 25 (AB 25) or PY 101 (100 mg /L)
The percentage of AB 25 adsorption capacity on AUMC050, AC and Biofilm after 210 min were 52, 70, 82 % (Fig.1), while the percentage of PY 101 removal were 42.1, 56, 78.1%, respectively (Fig. 2). These results depicted that, the biofilm of A. terreus AUMC-050 supported on AC was the most efficient biosorbent for biosorption of AB 25 and PY 101
Summary
The huge number of azodyes are widely produced annually. Dyestuff have variable application in the paper industry, textile, printing and dyehouses. Acid Blue 25 (AB 25) is one of the most applicable anthraquinone azodye in the field of wool and leather dyeing [1]. The pollution of water resources with industrial effluents containing organic compounds and toxic substances is a matter of great concerns. Industrial dyes are one of aromatic toxic compounds presents in water streams. They cause huge harms to all biota and human due to their complex aromatic structures, resistant to the light and moderate oxidizing agents, high stability and they are usually biologically nondegradable. Adsorption has been shown to be the most promising option for all these non-biodegradable organics for the removal from aqueous streams, activated carbons (AC) being the most common adsorbent for this process due to its effectiveness and versatility [5]. By an adsorption process the dye species are transferred to a solid phase (adsorbent) and subsequently can be recovered by a desorption process and stored in a dry place without direct contact with the environment [6]
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