Removal of manganese ions from synthetic groundwater by oxidation using KMnO4 and the characterization of produced MnO2 particles

Abstract

The aim of this study is to investigate the conditions for the removal of manganese ions from synthetic groundwater by oxidation using KMnO(4) to keep the concentration below the allowed level (0.05 mg/L). The process includes low-level aeration and addition of KMnO(4) in a Jar test system with Mn(2 + ) concentration of 0.50 mg/L, similar to that of natural groundwater in Taiwan. Different parameters such us aeration-pH, oxidant dose, and stirring speed were studied. Aeration alone was not sufficient to remove Mn(2 + ) ions completely even when the pH was increased. When a stoichiometric amount of KMnO(4) (0.96 mg/L) was used, a complete Mn(2 + ) removal was achieved within 15 min at an optimum pH of 8.0. As the amount of KMnO(4) was doubled, lower removal efficiency was obtained because the oxidant also generated manganese ions. The removal of Mn(2 + ) ions could be completed at pH 9.0 using an oxidant dose of 0.48 mg/L because Mn(2 + ) could be sorbed onto the MnO(2) particles. Finally, The MnO(2) particles were characterized using scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX).

Removal of manganese(II) and iron(II) from synthetic groundwater using potassium permanganate

“…Experiments were carried out using a standard jar test system, similar to those reported in Phatai et al [9]. Jar tests were done in triplicate and the average was obtained.…”

“…Therefore, an optimum amount of KMnO 4 is determined in order to reduce Mn 2+ and Fe 2+ to a concentration below the MCL. The optimum conditions such as pH and stirring speed obtained from the previous study [9] would be utilized in the removal of Fe 2+ and Mn 2+ in this study.…”

Removal of Some heavy metals Contaminants from Aqueous Solutions By Applying Biomass-Based Modified Activated Carbon

“…The Increase in rate of removal of metal ions with increasing adsorption time could be due to greater contact between the surface of the adsorbent and metal ions. Also, the existence of a large number of active surface sites on active carbon and the rapid diffusion of metal ions from the bulk of the solution to the adsorbent surface [28]. The adsorption was very rapid initially and large amount of Fe 3+ as well as Mn 2+ removed in first 50 min.…”

The Oxidative Precipitation of Thallium at Alkaline pH for Treatment of Mining Influenced Water

“…It has been reported that stoichiometric addition of KMnO 4 is not necessary for complete oxidation of some metals in solution (Phatai et al 2010;Roccaro et al 2006;US EPA 1999). Roccaro et al (2006) found that a pH adjustment to 8.5 coupled with the addition of half the stoichiometric amount of KMnO 4 was sufficient to reduce dissolved Mn from about 1.5 to \50 lg/L.…”

“…Roccaro et al (2006) found that a pH adjustment to 8.5 coupled with the addition of half the stoichiometric amount of KMnO 4 was sufficient to reduce dissolved Mn from about 1.5 to \50 lg/L. Phatai et al (2010) also demonstrated that a half stoichiomteric dose of KMnO 4 successfully reduced the dissolved concentration of Mn A B Fig. 4 Tl (lg/L) (a), Mn (lg/L) (b), and pH with time for actual MIW under three KMnO 4 conditions: quarterstoichiometric, halfstoichiometric, and stoichiometric (based on initial Mn concentration in actual MIW of 13 mg/L); error bars show the standard deviation for the triplicate analyses from 0.5 to \50 lg/L at pH 9.0.…”