Cosmetic wastewater treatment by the ZVI/H₂O₂ process

Abstract

The ZVI/HO process was applied for cosmetic wastewater treatment. Two commercial zero-valent iron (ZVI) types with different granulations were chosen: Hepure Ferrox PRB and Hepure Ferrox Target. In addition, the pH and stirring method influence on ZVI/HO process efficiency was studied. During the ZVI and ZVI/HO processes, linear Fe ions concentration increase was observed. The addition of HO significantly accelerated the iron dissolution process. The highest COD removal was obtained using finer ZVI (Hepure Ferrox Target) for doses of reagents ZVI/HO 1500/1600 mg/L, in a HO/COD weight ratio 2:1, at pH 3.0 with stirring on a magnetic stirrer. After 120 min of the process, 84.0% COD removal (from 796 to 127 mg/L) was achieved. It was found that the efficiency of the process depends, as in the case of the Fenton process, on the ratio of the reagents (ZVI/HO) and their dose in relation to the COD (HO/COD) but does not depend on the dose of the iron itself. Statistical analysis confirms that COD removal efficiency depends primarily on HO/COD ratio and ZVI granulation, but ZVI dose influence is not statistically significant. The head space, solid-phase microextraction, gas chromatography, mass spectrometry results confirm high efficiency of the ZVI/HO process.

Effect of pH on Zero Valent Iron Performance in Heterogeneous Fenton and Fenton-Like Processes: A Review

“…In the second stage the homogeneous Fenton reaction occurred in the presence of leached Fe, with enhancement of degradation because of the synergistic effect between Fenton reaction and reduction by ZVI-K [13]. A study on cosmetic wastewater treatment with ZVI showed that, while COD removal <15% was obtained by using ZVI or H 2 O 2 alone, the ZVI-Fenton process (ZVI + H 2 O 2 ) removed 84% of COD after 120 min [6]. Likewise, Segura et al have applied the ZVI-Fenton process for the treatment of drug manufacturing plant wastewater [3], achieving 60% of TOC mineralization.…”

“…Moreover, the reaction is fast and requires easy-to-use reagents [5]. The Fenton process can be applied either to decontaminate wastewater so that it meets the standards for safe discharge into natural water bodies, or to minimize the effluent toxicity and enhance its biodegradability, thereby allowing for an efficient biological depuration in municipal wastewater treatment plants [6]. In the classic homogeneous Fenton process, strong oxidant species are primarily produced by reaction of H 2 O 2 with iron ions (Fe 2+ ) in acidic conditions [7].…”

“…Among the catalysts used in heterogeneous Fenton and Fenton-like processes, zero-valent iron (ZVI) has attracted wide attention from researchers. ZVI is one of the most promising materials for water and wastewater treatment, due to its cost-effective and environmentally friendly production [18], non-toxicity [19], and ability to efficiently degrade or transform various pollutants such as halogenated compounds [20,21,22], nitrate [23], phosphate [24], polycyclic aromatic hydrocarbons [3,25], heavy metals [23,26,27], arsenic [28], dyes [6,29], and phenol [4,30].…”

Treatment of Landfill Leachates with Combined Acidification/Coagulation and the Fe0/H2O2 Process

“…Changing the stirring method from magnetic into a mechanic one could result in a decrease in process efficiency because of the paramagnetic properties of oxygen. Under the magnetic stirrer, the magnetic field increased the treatment efficiency [56,57]. It was also proved that radical generation is higher in oxic conditions [50], with a bigger amount of dissolved oxygen [58], or with more intensive stirring [53].…”

Luminescence characteristics of rare-earth-doped barium hexafluorogermanate BaGeF6 nanowires: fast subnanosecond decay time and high sensitivity in H2O2 detection

“…In addition, the inuences of several surrounding media on the PL characteristics of these nanowires have been studied and it is observed that the red PL emission is sensitive to H 2 O 2 , a reactive oxygen species, at low concentrations. H 2 O 2 is used in a wide range of applications, such as disinfectant, antiseptic and oxidizer in food, 25 pharmaceutical, 26 biomedical, 27 cosmetic, 28 and chemical industries, involving biological and environmental implications. 29,30 Besides, it is a propellant in rockets, 31 and a precursor and a decomposition product of triacetone triperoxide, a progressively used explosive by terrorists.…”