Removal of manganese from water supplies intended for human consumption: a case study

Roccaro, Paolo; Barone, Claudio; Mancini, Giuseppe; Vagliasindi, Federico G.A.

doi:10.1016/j.desal.2006.05.045

Cited by 75 publications

(49 citation statements)

References 17 publications

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“…In surface or ground waters, one finds iron and manganese in different chemical forms (dissolved, precipitated, free or complexed) and in variable concentrations (Myint and Barry, 1999;Omoregie et al, 2002;Muwanga and Barifaidjo, 2006). They may be present in concentrations of about 2 to 5 mg/L of iron and 0.5 to 2 mg/L of manganese (Ellis et al, 2000;Roccaro et al, 2007) or in concentrations that are markedly higher and capable of attaining 20 mg/L of iron and 5 mg/L of manganese (Berbenni et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Effect of pre-chlorination on the efficiency of iron and manganese removal from surface water by coagulation-flocculation using aluminium sulphate: case of the Okpara dam in the Republic of Benin

Zogo¹,

Bawa²,

Soclo³

et al. 2011

International Journal of Biological and Chemical Sciences

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Okpara dam water contained significant amounts of iron and manganese that could be problematic for consumers. In this study, we perfected a deferrization and demanganization technique by coagulationflocculation preceded by chlorination. The maximum iron and manganese concentrations varied from 30 to 50 mg/L and 1.5 to 4.5 mg/L respectively before treatment. Purification yields depended on the conditions of operation. Under the least favourable conditions (coagulation at free pH), the removal yields varied from 10 to 73% for iron and from 2 to 24% for manganese. Under the best conditions (pre-chlorination and coagulation at pH 6.5), we obtained between 50 and 95% elimination for iron and 20 and 45% for manganese. The treatment was therefore little adapted for the removal of manganese.

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Section: Introductionmentioning

confidence: 99%

Effect of pre-chlorination on the efficiency of iron and manganese removal from surface water by coagulation-flocculation using aluminium sulphate: case of the Okpara dam in the Republic of Benin

Zogo¹,

Bawa²,

Soclo³

et al. 2011

International Journal of Biological and Chemical Sciences

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“…If manganese ions are not oxidized during the water treatment process and are present in the public potable water distribution system, they are gradually oxidized, forming insoluble MnO 2 and generating various water quality related issues, such as water color, metallic taste, odor, turbidity, corrosively, hardness, and discoloration of laundry and plumbing fixture (Roccaro et al 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the extensive industrial use of manganese has led to this metal being present in many rivers and sediments around the world. Activities such as metallurgical processes, mining, and the manufacture of ceramics, dry cell batteries, pigments, and paints can all be sources of groundwater pollution (Mejía-Saavedra et al 2005;Nassar 2007;Roccaro et al 2007).…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the Use of Moringa oleifera Seeds for Removal of Manganese Ions from Aqueous Systems

Marques¹,

Alves²,

Coelho³

et al. 2013

BioResources

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Moringa oleifera seeds were investigated for the removal of manganese ions from aqueous solutions. The seeds utilized were obtained from plants grown in Uberlândia, Brazil. After being dried and pulverized, the seeds were treated with 0.1 mol L -1 NaOH. Using the optimized methodology (50 mL of 4.0 mg L -1 Mn(II), pH range of 4.0-6.0, contact time of 5 min, and biosorbent mass of 0.5 g) it was found that 100% of Mn(II) could be removed from water samples. In order to remove up to 95% of Mn ions in 50 mL of a laboratory residue produced during biochemical oxygen demand determinations with 112.0 mg L -1 of manganese, the contact time and pH were maintained, but a mass of 3.0 g was used. The kinetic data were fitted to a pseudo-second-order kinetic model. The sorption data were fitted satisfactorily to the Langmuir and Freundlich isotherm models. Evaluation applying the Langmuir equation gave the monolayer sorption capacity as 5.61 mg/g. In this application the method was found to be efficient, fast, simple, and economical.

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“…Yang et al (1997) demonstrated an increase in dosedependent changes in p53 levels after exposure of a normal thyrocyte to radiation, accompanied by DNA repair in vitro. Another study showed a lower number of ARG genotype homozygous TP53 alleles in PTC adult patients exposed to radiation when compared with sporadic PTC patients and indicated that combinations of alleles can contribute to TP53 DTC risk in individuals exposed to radiation during childhood, adolescence, or even adulthood (for women; Rogounovitch et al 2006). However, mutations in TP53 may not be used as a marker of radiation-induced disease.…”

Section: Radiation Exposurementioning

confidence: 99%

The influence of the environment on the development of thyroid tumors: a new appraisal

Marcello¹,

Malandrino²,

Almeida³

et al. 2014

Endocrine Related Cancer

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Most epidemiological studies concerning differentiated thyroid cancers (DTC) indicate an increasing incidence over the last two decades. This increase might be partially explained by the better access to health services worldwide, but clinicopathological analyses do not fully support this hypothesis, indicating that there are carcinogenetic factors behind this noticeable increasing incidence. Although we have undoubtedly understood the biology and molecular pathways underlying thyroid carcinogenesis in a better way, we have made very little progresses in identifying a risk profile for DTC, and our knowledge of risk factors is very similar to what we knew 30-40 years ago. In addition to ionizing radiation exposure, the most documented and established risk factor for DTC, we also investigated the role of other factors, including eating habits, tobacco smoking, living in a volcanic area, xenobiotics, and viruses, which could be involved in thyroid carcinogenesis, thus, contributing to the increase in DTC incidence rates observed.

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Removal of manganese from water supplies intended for human consumption: a case study

Cited by 75 publications

References 17 publications

Effect of pre-chlorination on the efficiency of iron and manganese removal from surface water by coagulation-flocculation using aluminium sulphate: case of the Okpara dam in the Republic of Benin

Effect of pre-chlorination on the efficiency of iron and manganese removal from surface water by coagulation-flocculation using aluminium sulphate: case of the Okpara dam in the Republic of Benin

Assessment of the Use of Moringa oleifera Seeds for Removal of Manganese Ions from Aqueous Systems

The influence of the environment on the development of thyroid tumors: a new appraisal

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