Complex electrical conductivity as a new technique to monitor the coagulation-flocculation processes in the wastewater treatment of the textile Industry
“…Furthermore, azo-dyes from textile is sometimes complicated to entirely degrade through conventional Physico-chemical strategies such as coagulation, flocculation, reverse osmosis technique, and activated carbon adsorption [ 16 , 17 ]. Moreover, such traditional treatments have various disadvantages, including excess chemicals, more energy consumption, the formation of a huge quantity of sludge, and secondary pollution [ 18 , 19 ].…”
The effluents from textile industries without proper treatment contains a remarkable amount of synthetic dyes which are harmful to the environment and a big challenge globally to degrade it with a eco-friendly way. Conventional methods are extremely energy-consuming, non-effective and generate a toxic sludge impacting the environment. Several microorganisms can be utilized to treat these effluents. The research deals with five bacteria isolated from textile effluent and their consortium for the biodegradation ability of Novacron dyes. The isolates were identified through the Biolog™ identification system and molecular technique. Biodegradation was confirmed by measuring optical density (OD) optimizing conditions (pH 7.0, temperature 37 °C, 10 % inoculums and 100 mg/L dye) under static condition. The isolates started decolourization at 24 h whereas, the consortium started decolourization at 18 h and exhibited a maximum after 72 h. The presence of low molecular weight protein as metabolite supported the biodegradation and non hazardous to environment. This study revealed that these bacteria might have degradation potentials, and research results will help to set up dye removal eco-friendly methods to expose the dye effulents to environment in future.
“…Furthermore, azo-dyes from textile is sometimes complicated to entirely degrade through conventional Physico-chemical strategies such as coagulation, flocculation, reverse osmosis technique, and activated carbon adsorption [ 16 , 17 ]. Moreover, such traditional treatments have various disadvantages, including excess chemicals, more energy consumption, the formation of a huge quantity of sludge, and secondary pollution [ 18 , 19 ].…”
The effluents from textile industries without proper treatment contains a remarkable amount of synthetic dyes which are harmful to the environment and a big challenge globally to degrade it with a eco-friendly way. Conventional methods are extremely energy-consuming, non-effective and generate a toxic sludge impacting the environment. Several microorganisms can be utilized to treat these effluents. The research deals with five bacteria isolated from textile effluent and their consortium for the biodegradation ability of Novacron dyes. The isolates were identified through the Biolog™ identification system and molecular technique. Biodegradation was confirmed by measuring optical density (OD) optimizing conditions (pH 7.0, temperature 37 °C, 10 % inoculums and 100 mg/L dye) under static condition. The isolates started decolourization at 24 h whereas, the consortium started decolourization at 18 h and exhibited a maximum after 72 h. The presence of low molecular weight protein as metabolite supported the biodegradation and non hazardous to environment. This study revealed that these bacteria might have degradation potentials, and research results will help to set up dye removal eco-friendly methods to expose the dye effulents to environment in future.
“… Fig. 2 Peristaltic pump [1] , ZnO synthesized nanoparticles on stone bed [2] , UV lamp [3] , cubic reactor [4] , Transformer [5] . …”
Section: Reactor Design and The Process Operationmentioning
confidence: 99%
“…The textile industry wastewater contains many contaminants such as dyestuff, chemical compounds and nonionic surfactants therefore, the textile industry is one of the most polluting industries [1] . Azo dyes are non-degradable, resistant to light, have one or more nitrogen-nitrogen band.…”
Azo dyes are the largest group of synthetic organic dyes which containing the linkage C—N
N—C and used in various industries such as textile industries leather articles, and some foods. Azo dyes are resistant compounds against the biodegradation processes. The purpose of this research was hybrid UV/COP advanced oxidation process using ZnO as a catalyst immobilized on a stone surface for degradation of acid red 18 (AR18) Dye. In the hybrid process using some parameters such as the dye initial concentration, pH, contact time and catalyst concentration, the process efficiency was investigated. In order to the dye removal, the sole ozonation process (SOP), catalytic ozonation process (COP) and photocatalytic process (UV/ZnO) were used. The ZnO nanoparticles were characterized by XRD, SEM and TEM analyses. The maximum dye removal was achieved 97% at the dye initial concentration 25 mg/L, catalyst concentration 3 g/L, contact time 40 min and pH 5. As a real sample, the Yazdbaf textile factory wastewater was selected. After that, the physicochemical quality was evaluated. As well as, in the optimal conditions, the AR18 dye removal efficiency was achieved 65%. The kinetic results demonstrated that the degradation reaction was fitted by
pseudo
-first-order kinetic. The UV/COP hybrid process had high efficiency for removal of resistant dyes from the textile wastewater.
Advantages of this technique were as follows:
ZnO nanoparticles were synthesized as catalyst by thermal method and were immobilized on the stones.
pH changes had no significant effect on the removal efficiency.
In the kinetic studies, the decomposition reaction followed
pseudo
-first order kinetic.
“…They affect aquatic life by causing disorders and serious threats to public health (Khan et al 2014). This is the reason why many researchers in the field of water treatment are interested in the elimination of dye pollutant by adapting several methods such as: coagulation, adsorption, biodegradation, precipitation, membrane separation and advanced oxidation processes (AOPs) (Meziani et al 2016;Ikhsan et al 2020;Berkessa et al 2020;Bilińska et al 2020;He et al 2020;Kiani et al 2020;Mortadi et al 2020). In recent years, advanced oxidation processes have been studied as a promising kind of treatment method for organic wastewater, based on in situ generation of highly oxidant species, such as hydroxyl radicals (HO • , 0 2.81 V/NHE E ) among others (Zaviska et al 2009).…”
Hydroxyapatite (HA), a calcium hydroxyphosphate was prepared via precipitation method and used as a catalyst in a Fenton like process for methyl violet (MV) dye degradation. This study is aimed to evaluate the effect of hydrogen peroxide concentration, HA dose, initial pH, temperature and MV concentration on the catalyst performance to find out the optimum conditions leading to maximum efficiency of the Fenton process. The results showed that MV dye with a concentration of 20 mg L-1 can be removed within just 10 minutes at the optimal conditions of 36 mmol L–1 H2O2 and 2.5 g L–1 HA at pH of 6.65 and T = 48 °C). The experimental outcome of this study also demonstrates that HA displayed a good recyclability over three cycles; while the use of scavenger highlighted that the hydroxyl radical HO• was the main active species for MV degradation. The catalytic tests result of MV dye degradation were analyzed by the first-order, second-order and Benhnajady-Modirshahla-Ghanbery (BMG) kinetic models, those showing that the Fenton like reaction follows the first-order and BMG models. The activation energy of the reaction and the values of thermodynamic parameters such as standard enthalpy (ΔH*0), entropy (ΔS*0) and Gibbs free energy (ΔG*0) were also evaluated. Those results revealed that the degradation of MV over the as-synthesized material is an endothermic and non-spontaneous process.
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