Decontamination of alachlor herbicide wastewater by a continuous dosing mode ultrasound/Fe2+/H2O2 process

Degradation of alachlor using an enhanced sono-Fenton process with efficient Fenton's reagent dosages

“…In addition, this study investigated the effects of ultrasonic power on the degradation and mineralization of alachlor, as shown in Table 2. Our earlier study [20] proposed that the degradation of alachlor by ultrasound (100 W) was only 6.5% effective with 3.6% TOC removal after 60 min, which indicated that using ultrasound alone was not effective for degrading alachlor. The ultrasonic power designed at 0 W in Table 2 should be defined as the Fenton reaction (only Fe 2C and H 2 O 2 without ultrasound).…”

Degradation and Detoxicity of Tetracycline by an Enhanced Sonolysis

“…The pH level of solution is a key parameter affecting the kinetics of the ultrasound/Fe 2+ /H 2 O 2 process and most studies adopted acidic conditions attained satisfactory degradation efficiency (Oturan et al, 2008;Wang and Liu, 2014). Based on pH changing, the nature of organic compound, the scavenge of OH by H + and the solubility of iron can affect the pollutant treatments (Ma, 2012).…”

“…Our previous studies (Ma, 2012;Wang et al, 2013b;Wang and Liu, 2014) found that a continuous dosing procedure of chemicals into the reactor was effective on the enhancement of refractory compounds degradation in sonochemical systems. Hence, in this study, an enhanced sonolysis, namely, a combination of ultrasound with three transition metals (Fe ), was conducted to degrade the tetracycline and investigate its feasibility; in addition, the transition metals and oxidizing agents were dosed into the reactor with a continuous dosing procedure ultrasound.…”

“…Based on the results shown in above studies, the strength of introduced energy by ultraviolet (UV) light or ultrasound, additions of H 2 O 2 or iron-salts and pH affect the efficiency of tetracycline degradation. Among several available advanced oxidation processes (AOPs), the sonochemical oxidation has been demonstrated as a promising method for the degradation of aqueous refractory compounds (Wang and Liu, 2014) due to its advantages of being non-selective and without secondary pollution. Wang et al (2011) reported that the increase of ultrasonic watts (W) led to the increase of tetracycline degradation and a synergistic effect was achieved in by the combination of ozone and ultrasound.…”

Degradation of organophosphorus pesticide diazinon using activated persulfate: Optimization of operational parameters and comparative study by Taguchi's method

“…Considering treatment approaches, oxidation processes show immense potential for the remediation of contaminated soils in which sturdy oxidants are injected into the subsurface [15,16]. Recently, persulfate (also known as peroxydisulfate) oxidation has emerged as a preferred oxidant for organic contaminants in soils and sediments [17][18][19][20][21][22].…”