Biological treatment of Mn(II) and Fe(II) containing groundwater: kinetic considerations and product characterization.

Removal of Fe(II) from tap water by electrocoagulation technique.

Evaluating the effectiveness of copper sulphate, chlorine, potassium permanganate, hydrogen peroxide and ozone on cyanobacterial cell integrity.

Today, heavy metal pollution is of prime concern from the environmental point of view. Among the heavy metals, manganese is a very common contaminant of wastewater and ground water, as it is a significant raw material for industry. This paper reviews various technologies that have been used to treat manganese containing wastewater and ground water, such as chemical precipitation, coagulation, flotation, ion-exchange, oxidation/filtration, electrochemical treatment, adsorption, and membrane filtration. Recovery of manganese is also very imperative due to its economical and environmental aspects.

A review of technologies for manganese removal from wastewaters

Iron and manganese removal and membrane fouling during UF in conjunction with prechlorination for drinking water treatment

Removal of iron and manganese from groundwater by oxidation and microfiltration

Conventional greensand treatment for the removal of iron and manganese from groundwater is not quite appropriate for waters with a high content of iron and manganese. In this pilot study, different modifications to this process were tested to improve treatment performances for water with a high concentration of iron and manganese: addition of a settling tank, use of sand and anthracite covered with manganese oxides, and aeration. Different oxidants and oxidation sequences were also tested. Results show that the presence of a high quantity of iron significantly improves removal of manganese. These results also confirm that manganese oxidation can be realized with free chlorine inside a filter bed other than greensand, provided that the excess of free chlorine is sufficient. Within the conditions studied, the target area for filtration performances can be attained for every treatment sequence tested and for a filtering aid dose ranging from 0.25 to 0.5 mg/L. Although groundwater aeration leads to better set...

Donald Ellis

Papers

Removal of iron and manganese from groundwater by oxidation and microfiltration

Traitement physico-chimique d'une eau souterraine fortement chargée en fer et en manganèse