Ülküye Dudu Gül

Application of mixed fungal biomass for effective reactive dye removal from textile effluents

ABSTRACT Reactive Remazol Blue (RB) removal properties of growing Aspergillus versicolor and Rhizopus arrhizus were investigated as a function of initial pH (3–7) and dye concentration (50–800 mg/L) in low-cost molasses medium. Decolorization activity of mixed (A. versicolor and R. arrhizus together) culture in the absence and presence of (0.5 and 1 mM) dodecyl trimethyl ammonium bromide (DTAB) was examined at optimal conditions. A. versicolor and R. arrhizus exhibited maximum decolorization at pH 6 as 89.4% and at pH 3 as 69.23% at 100 mg/L dye concentration in six days. The decolorization of A. versicolor depended on fungal growth but R. arrhizus was related with its positively charged surface. Decolorization by both fungi decreased with increasing dye concentration up to 800 mg/L. The mixed culture decolorized 86.5% and 100% of 100 mg/L RB in the absence and presence of 0.5 mM DTAB in three days. Decolorization activities by R. arrhizus (10.06%), A. versicolor (15.79%), the mixed culture (26.59%), the ...

Comparison of color removal from reactive dye contaminated water by systems containing fungal biosorbent, active carbon and their mixture

The adsorption of Everzol Black (EB) from synthetic aqueous solution onto active carbon (AC) and dried fungal biosorbent (Rhizopus arrhizus) was studied under the same experimental conditions. The effects of initial dye concentration, adsorbent dosage and contact time were examined at a batch-scale level. As an alternative to AC, fungus was investigated as a low-cost adsorbent for dye removal. The amount of EB adsorbed onto AC was lower compared with fungal biosorbent; dye adsorption capacity of AC and fungal biosorbent were 94.48 and 106.61 mg/g, respectively. The adsorbent dosage experiments showed that 4 g/L biosorbent removed 100% of EB (Co: 114.39 mg/L) after 2 hours. The results obtained from this study showed that biosorbent effectively removed reactive dye from dye-containing water in a short time period. Langmuir and Freundlich adsorption isotherm models were used for mathematical description of the biosorption equilibrium data; the Freundlich model was found to exhibit good fits to the experimental data. According to the Freundlich isotherm, the maximum dye adsorption capacities of AC and biosorbent were calculated as 344.82 and 357.14 mg/g, respectively. The Fourier transform infrared spectroscopy spectral analysis showed the involvement of functional groups for dye bindings.

COMPARISON THE DYE REMOVAL ACTIVITY OF SYSTEMS CONTAINED SURFACTANTS AND FUNGUS

Dye decolorization ability of the systems contained only R. arrhizus, only cationic surfactants and both of them were studied. The optimal pH (3-7), initial dye (50-800 mg/L) and surfactant concentration (0.5 and 1 mM) for Alkythrimethyl ammonium bromide (CTAB) was determined in three days incubation period and the difference of Remazol Blue dye removal activity between Dodecylthrimethyl ammonium bromide (DTAB), Hegzadecylthrimethyl ammonium bromide (HTAB) and CTAB was identified. In the surfactant effect experiments it was observed that maximum dye removal activity occured in the system contained both fungus and 0.5 mM CTAB as, 77.52%, while the dye removal activity of only fungus and only CTAB were 21.2% and 71.2% in 100 mg/L dye concentration. The optimal conditions for dye removal were pH 5, low initial dye concentratios such as 100 mg/L and 1 mM CTAB concentration at the end of three days incubation period and the 95.4% dye removed by the sytem contained both fungus and CTAB. The dye removal activiy of the system contained fungus and cationic surfactants (DTAB, CTAB and HTAB) was compaired in the same optimal conditions and observed that maximum dye removal occured in the system that contained fungus and 1 mM HTAB, as 98.4%. The systems that contained surfactant and fungus are new approcahes for effective dye removal from textile effluents. According to this study, the CMC of surfactant is an important issue to increase dye removal efficiency.

Degradation of Reactive Blue by the mixed culture of Aspergillus versicolor and Rhizopus arrhizus in membrane bioreactor (MBR) system

AbstractThe main purpose of this study was to investigate reactive dye removal capability of mixed fungal biomasses (Rhizopus arrhizus and Aspergillus versicolor) under non-sterile conditions with the inherent advantages of the submerged membrane bioreactor (MBR) system. Decolorization of Reactive Blue in synthetic textile wastewater by mixed filamentous fungi was carried out in the Erlenmeyer flasks (sterile conditions) and MBR system (non-sterile conditions). The Lab/Pilot Scale MBR system had a working volume of 170 L and was equipped with a coarse and fine air bubble creation mechanism for membrane and biological aeration, respectively. The dye and chemical oxygen demand (COD) concentration values were measured daily in influent as well as effluent to evaluate the removal efficiencies. Most of the analytical techniques used in this study were mentioned in the standard methods. The removal efficiency of color and COD were 90.71 and 90% in the MBR system, respectively. Using mixed fungal strains in the ...

Determination of methylene blue biosorption by Rhizopus arrhizus in the presence of surfactants with different chemical structures.

Methylene blue (MB) biosorption properties of Rhizopus arrhizus were investigated in the presence of surfactants. The effects of cationic and anionic surfactants on MB removal by dead biomass (1 g L−1) were determined. MB removal was tested as a function of initial pH (2–12), contact time (5–1440 min), and dye (37.4–944.7 mg L−1) and surfactant (0–10 mM) concentrations. The opposite charged anionic surfactant dodecylbenzenesulfonic acid sodium salt (DBS) enhanced sorption of cationic MB by biomass dramatically. Maximum biosorption capacity was 471.5 mg g−1 at pH 8 with 0.5 mM DBS at 944.7 mg L−1 MB concentration. The surfactant-stimulated fungal decolorization method may provide a highly efficient, inexpensive, and time-saving procedure in biological wastewater treatment technologies.

Adsorption of Everzol Black by Using Amberlyst A21: Isotherm and Kinetic Studies

Bu calismada Everzol Black boyasinin sulu cozelti ortamindan giderimi Amberlyst A21 ile incelenmistir. pH, temas suresi ve baslangic boya derisimi gibi degisik parametrelerin boya adsorpsiyonu uzerine etkileri calisilmistir. Langmuir, Freundlich ve Temkin izoterm modelleri denge adsorpsiyon verilerinin analizi icin kullanilmistir. Ayrica adsorpsiyon kinetik verileri yalanci birinci ve ikinci dereceden kinetik modeller kullanilarak incelenmistir. Calisma sonuclarina gore Amberlyst A21 ile Everzol Black giderimi Langmuir izoterm modeli ve yalanci birinci dereceden adsorpsiyon kinetigi ile tanimlanabilir.

Biosorption of Acid Red P-2BX by lichens as low-cost biosorbents

ABSTRACT The aim of this study is to examine the dye biosorption properties of lichen species called Cladonia convoluta and Evernia prunastri. Since lichens are extensively found in the environment, their suitability as a cheap adsorbent has been investigated in this study. The optimal parameters for textile dye biosorption were also determined. The dried lichen biomass showed better dye biosorption capacity than ash lichen biomass. C. convoluta had better dye biosorption capacity than E. prunastri. Dye biosorption rate was found as 71.41% at optimal conditions. This study concluded that C. convoluta was a successful and cheap biosorbent for treatment of water contaminated by Acid Red P-2BX dye.

Comparison of nickel biosorption properties of living and dead Rhizopus arrhizus biosorbent

The passive removal of commonly used heavy metal Ni(II), from aqueous solutions by inexpensive biomaterial, fungi Rhizopus arrhizus biomass, termed biosorption, was studied in this study. The effects of biomass type (living and dead) and pH (2-6) on metal removal by fungus were investigated. The dead biomass (44.2%) exhibited higher uptake ability of Ni(II) than living biomass (40.5%) at 100 mg/L heavy metal after 6 h. Optimal pH for biosorption was 6.

The effect of dodecyltrimethilammoniumbromide on Ni biosorption property of white rod fungi

Industrial waste water contains abundant amount of heavy metals, therefore the treatment of heavy metals have gained importance. The effect of Dodecylthrimetylammonium bromide (DTAB) on biological treatment of heavy metal called Nickel by white rot fungus Trametes versicolor was examined in this study. In biosorption experiments, the effects of DTAB, pH and contact time on removal of Nickel by dried T. versicolor were investigated. The results of Nickel removal experiments showed that after 4 hours of incubation Nickel biosorption was 14.95% and 24.81% in the absence and peresence of DTAB, respectively. The addition of surfactant had contribution on metal biosorption. The results of research finding showed that the biolgical heavy metal treatment capacity of fungus was enhanced by using surfactants.

TARIMDA KULLANILAN ATRAZİNİN GİDERİMİNDE RHIZOPUS

Atrazine is commonly used in agricultural activities. Atrazine residues occur in soil and then move to underground and surface waters. The higher amount of Atrazine is toxic for living organisms. The treatment of Atrazine contaminated aquoeous environment is an important issue. Bioaccumulation and biosorption is suggested as an eco-friendly way to remove this kind of pollutans in the environment. The aim of this study is to determine the Atrazine removal capacity of both growing Rhizopus arrhizus culture and dried fungal biomass. The effect of different pH values on Atrazine bioaccumulation and biosorption by R. arrhizus culture was determined in this study. Electrochemical methods were used for Atrazine analyse. The optimal pH for Atrazine removal was determined as 4 and 6 for bioaccumulation and biosorption, respectively. The growing R. arrhizus culture and dried R. arrhizus biomass removed 57.45% and 63.16% of Atrazine, respectively. According to the results of this study the fungal strain was effectively removed Atrazine from pesticide contaminated aquoeous solutions in a short time period. This study showed that the fungal systems can be used as alternative ways to reduce negative environmental impact of Atrazine.