Assessing the performance of wastewater treatment with the combination of Fenton and ferrite process

Abstract

Industrial wastewater typically contains various metal ions. Traditional metal ion treatment processes such as chemical precipitation generate large volumes of toxic sludge which needs to be further solidified or disposed of. The ferrite process (FP), which is another effective approach of treating metal ion-containing wastewater, can crystallize metal ions into ferrites; the sludge easily precipitates, is stable and can be recycling. This investigation explores the feasibility of the Fenton process and the FP (FFP) for treating wastewater that contains metal ions. It considers one factor that adds noise to the FP, ethylenediaminetetraacetic acid, and establishes the optimum parameters of each procedure. The analytical results demonstrate that the proper conditions for Fenton process were pH = 2, [Fe(2+)] = 10(-2) M, H(2)O(2) dosing rate = 5 x 10(-4) mol min(-1), reaction time = 12 min. For the proposed multi-stage FP, the preferred Fe(2+) dosage was 0.098 mol in each stage and the sludge met the toxicity characteristic leaching procedure standards. Following the FFP, the effluent water or the sludge easily met Taiwan's standards. Finally, the SEM test demonstrated that size of the sludge particles was 50-110 nm.

Magnetic field generation in the water treatment perspectives: An overview

“…However, in 1919 Kramers postulated a mechanism of exchange between metal ions through the intermediary oxygen ions. Néel combined his theory on antiferromagnetism with Kramers ideas on indirect exchange and formulated his new theory for antiferromagnetic oxides and later for ferrites (Kefeni et al, 2017;Lou and Huang, 2009;Yang, 1994;Navratil, 2016;Ali, 2012;Ghernaout et al, 2009;Ghernaout et al, 2010). Later, this theory was put on a mathematical basis and called it super exchange.…”

Fenton oxidation and combined Fenton-microbial treatment for remediation of crude oil contaminated soil in Assam – India

“…As a rule, it was hypothesized that the acidic pH conditions of 2.0-4.0 favoured the oxidation of organic compounds, as it is known that the decomposition rate of hydrogen peroxide reaches the maximum in this pH range. 36 This phenomenon is attributed to the progressive hydrolysis of the ferric ion, which provides a relatively large catalytically active surface for contact with H 2 O 2 . The accelerator Fe 2+ ion in H 2 O 2 decomposition will yield more hydroxyl radicals.…”

Removal of residual contaminants in petroleum-contaminated soil by Fenton-like oxidation

“…An excess of Fe 3+ in the solution may cause unproductive consumption of hydroxyl radicals. Moreover, EDTA can also consume a certain number of hydroxyl radicals, since hydroxyl radicals non-specifically oxidize the organic compounds [22]. However, it may be observed that once the ratio of H 2 O 2 :Fe 3+ had reached 150 (pH 6.0) or 200 (pH 7.0 and 7.5), the removal levels of TEO decreased as the concentration of iron diminished.…”

“…The catalyst seemed to be less active at pH 6.0 than at pH 7.0. Lou and Huang [22] demonstrated that the destruction efficacy of EDTA increased with decreasing pH due to the enhanced generation of hydroxyl radicals. In the present study, the degradation of EDTA might be quicker at pH 6.0 than at pH 7.0, which caused the precipitation of ferric iron.…”