Enhancement of the advanced Fenton process by ultrasound for decolorisation of real textile wastewater

Abstract

Successful decolorisation of real textile wastewater was achieved by means of the advanced Fenton process in conjunction with ultrasound technology. A synergy factor of 6.9 for this combined method was determined. The decolorisation followed zero‐order kinetics, and the rate increased with increasing zero‐valent iron dose and decreasing pH and hydrogen peroxide concentration. The optimum conditions for an American Dye Manufacturers Institute decolorisation value of 1638 ADMI was found to be a pH of 3.0, an ultrasound frequency of 47 kHz, a zero‐valent iron dose of 1.0 g l−1, and a hydrogen peroxide concentration of 1.03 × 10−2 m. Under these conditions, the estimated operating cost to decolorise 96% true colour was estimated to be $US 4.51 m−3. The study demonstrated that the given combined method could be applied to decolorise textile wastewaters.

Enhanced oxidation of erythromycin by persulfate activated iron powder–H 2 O 2 system: Role of the surface Fe species and synergistic effect of hydroxyl and sulfate radicals

“…(2) and (3) especially when using micrometric ZVI powder [9]. Thus, for ZVI-H 2 O 2 system (designated as HR system), most of the studies are conducted under acid condition [10], using nano-ZVI [11,12] or enhanced by ultrasound and heat [13][14][15] to accelerate the electron transfer.…”

Advanced oxidation treatment of pentoxifylline in aqueous solutions

“…The kinetics of concentration removal for PTX in photo-Fenton system followed pseudo-first order reaction with the reaction rate constants: 0.099 min -1 (R 2 0.91); 0.054 min -1 (R 2 0.96); 0.053 min -1 (R 2 0.96), 0.0028 min -1 (R 2 0.90) for 0.5, 0.75, 1 and 10 mM PTX, respectively. In the following experiments, to 200 cm 3 of solution A, 0.18 of mM ferrous sulfate and 1.22 mM of hydrogen peroxide and into 200 cm 3 of solution E, 1.80 mM of ferrous sulfate and 12.20 mM of hydrogen peroxide were added. For reaction of 200 cm 3 of 10 mM PTX 18 mM ferrous sulfate and 122 mM hydrogen peroxide were applied.…”

“…In order to improve the quality of wastewater entering to the large bodies of water, multi-stage _________________________ waste treatment may be applied. Recently more attention has been paid to advanced oxidation processes (AOPs) which have demonstrated to be efficient to remove non--biodegradable pollutants [3]. AOPs are based on reaction between organic molecules and hydroxyl radicals ( • OH) generated in water systems and characterized by high oxidation potential (E° = 2.8 V vs. standard hydrogen electrode (SHE)), high reactivity and non-selectivity.…”

Fabrication of hollow and nonhollow SiO2 nanofibers for removal of cationic dyes from aqueous solutions

“…Among the various methods (adsorption, nanofiltration, ozonation, electrocoagulation, ultrasound, Fenton, and photocatalytic degradation) used for the removal of dyes from wastewater , procedures based on adsorption phenomenon is considered as an effective approach . Many low‐cost adsorbents are available such as magnetite , zeolite , green tea waste , natural clay , and agriculture wastes like rice husk , and wheat straw .…”