Case study on the bioeffluent of petrochemical wastewater by electro-fenton method

Abstract

The electro-Fenton method, in which ferrous ion is produced at the anode and used as a catalyst of H2O2, was applied for treating the bioeffluent of petrochemical manufacturing wastewater. The major pollutant in the bioeffluent was identified as hexamine, which was nonbiodegradable and contributed 65% of COD. The goal of this study was to treat the biotreatment effluent with more than 50% of COD removal efficiency. Oxidants that involved ozone, ozone/H2O2, sodium hypochlorite, and Fenton's reagent were employed to treat this effluent by jar tests. However, none could meet the goal in the range of operating conditions used. On the other hand, more than 80% of COD was removed with the electro-Fenton process. These screening tests indicated that only the electro-Fenton process was compatible with the goal.

Combined bioremediation and advanced oxidation of green table olive processing wastewater

“…Moreover, they depend on a series of factors such as electrode type and pH of the solution [27]. In the last decade, a special type of electrochemical reactions, the electro-Fenton system, has attracted considerable research interest [28][29][30][31][32]. These are of three main types: in the first (EF-H 2 O 2 method), H 2 O 2 is electrogenerated from two-electron reduction of sparged oxygen on the cathode while Fe 2+ is added [29]; the second (EF-Feox method) uses added H 2 O 2 and electrogenerated Fe 2+ which is produced via the oxidation of iron, the sacrificial anode [30,31]; and in the third type, H 2 O 2 is added while Fe 2+ is electrogenerated via the reduction of ferric sulphate or ferric hydroxide sludge [28,32].…”

Sorption behavior of Pb(II) and Cd(II) on iron ore slime and characterization of metal ion loaded sorbent

“…Benjamin and Leckie [15] developed a heterogeneous site model for the surface of iron oxide, which can successfully explain the sorption of Cd, Zn, Cu and Pb as a function of pH, metal ion concentration and adsorbent concentration. A low-cost adsorbent, iron oxide on activated alumina was developed by Huang et al [16] for removing heavy metals from wastewater. The iron ore slimes are not suitable in iron and steel making due to their extremely fine size.…”

Thermodynamics and kinetics of adsorption of Cu(II) onto waste iron oxide

“…A novel low-cost adsorbent, iron oxide on activated alumina, was developed as follows [22]. The activated alumina grains were sieved before seeding and then packed into the 30 m 3 FBR (2.1 m Ø × 9 m height).…”