Remediation of fuel oil contaminated soils by activated persulfate in the presence of MnO₂

Abstract

Mazloomi S., Nasseri S., Nabizadeh R., Yaghmaeian K., Alimohammadi K., Nazmara S., Mahvi A.H. (2016): Remediation of fuel oil contaminated soils by activated persulfate in the presence of MnO 2 . Soil & Water Res., 11: 131-138.In this study, batch system experiments were carried out for evaluating the capability of persulfate (PS) to remediate fuel oil contaminated soils. Remediation was performed by spiking soil samples with fuel oil and then treating the mixture with sodium PS. Different controlling factors including pH (3, 6, and 9), PS concentrations (50-500 mmol/l), metal activators (ferrous sulfate, magnetite, and MnO 2 ), and temperature (25, 40, and 60°C) were considered. Results proved that PS oxidation is effective in fuel oil degradation. The best PS : Fe 2+ molar ratios were reported 400 : 2 and 250 : 1 for silty clay and loamy sand soil samples, respectively. Lower pH was more of interest in removal of fuel oil by PS oxidation. MnO 2 improved fuel oil degradation when used together with metal activators. The results showed that when MnO 2 was used together with ferrous sulfate and magnetite at acidic condition (pH = 3), the removal efficiencies were the best. Increasing temperature from 25 to 60°C improved the fuel oil degradation in the PS oxidation batch system. The results showed that activating PS by using ferrous sulfate along with MnO 2 at acidic condition in 60°C could increase fuel oil degradation near to 58% in silty clay soil samples, while the degradation rate for loamy sand soil samples in similar conditions was 62%.

An investigation of desalination by nanofiltration, reverse osmosis and integrated (hybrid NF/RO) membranes employed in brackish water treatment

“…Also another study declared that with increasing operation pressure removal of materials in water were increased [40, 41]. Other Researches of performance nanofiltration in Iran have done and revealed that NF membranes could decrease TDS in permeable very well if the concentration TDS in row water is around 3000 mg/L.…”

Performance of Advanced Oxidization UV/S2O8-2 in Removing Acid Green 3 from Aqueous Solutions: Modeling Based Linear Regression, Kinetic Studies

“…These reactions are caused by the radiation of photons resulting from UV radiation (7). However, with UV radiation in the presence of S 2 O 8 -2 , the photolysis process occurs which produces highly active SO 4radicals which have a high ability for oxidating organic compounds (12). Moreover, by increasing the concentration of S 2 O 8 -2 , an increase was observed in efficiency due to the increase in SO 4radical compared to the dye concentration, consistent with the results of Moradi et al (18).…”

“…UV/ S 2 O 8 -2 is an AOP method with a significant expansion in environmental pollutant removal processes. The widespread use of S 2 O 8 in AOP processes may be its high oxidation ability (2.01 V), stability, low cost, easy storage, high solubility, and production of highly active radicals SO 4with the oxidation potential of 2.5 -3.1 V and OH • with the potential of 1.8 -2.8 (10)(11)(12). Equations 1 -3 show the pathways for the production of these radicals.…”

Heterogeneous catalytic degradation of methylparaben using persulfate activated by natural magnetite; optimization and modeling by response surface methodology

“…The common approaches used for persulfate activation include thermal, ultraviolet (UV) irradiation, ultrasound (US), microwave (MW), magnetic nanoparticle‐functionalized carbon (MNP@C), TiO 2 ‐functionalized magnetic activated carbon (T@MPAC) and transition metal ion (e.g. Fe 2+ , Co 2+ , Mn 2+ , Ag 2+ and Ni 2+ ) methods . Among the transition metal ions, Fe 2+ is superior and is broadly employed for the decomposition of persulfate.…”

“…Fe 2+ , Co 2+ , Mn 2+ , Ag 2+ and Ni 2+ ) methods. [25][26][27][28][29][30][31] Among the transition metal ions, Fe 2+ is superior and is broadly employed for the decomposition of persulfate. It is important to note that other metal ions are considered as toxic elements.…”