Final disposal of clay wastes from arsenic removal processes

2014 ◽  
pp. 681-683
Author(s):  
E De Seta ◽  
J Meichtry ◽  
A López ◽  
F Reina ◽  
F Mugrabi ◽  
...  
Keyword(s):  
Arsenic Removal ◽  
Final Disposal ◽  
Removal Processes

Arsenic removal by MF membrane with chemical sludge adsorption and NF membrane equipped with vibratory shear enhanced process

2003 ◽  
Vol 3 (5-6) ◽  
pp. 303-310 ◽  
Author(s):  
S.-H. Yi ◽  
S. Ahmed ◽  
Y. Watanabe ◽  
K. Watari
Keyword(s):  
Arsenic Removal ◽  
Membrane Surface ◽  
Membrane Process ◽  
Low Concentrations ◽  
Strong Shear ◽  
Low Levels ◽  
Removal Processes ◽  
Removal Of Arsenic ◽  
Concentration Polarization Layer ◽  
Chemical Sludge

Conventional arsenic removal processes have difficulty removing low concentrations of arsenic ion from water. Therefore, it is very hard to comply with stringent low levels of arsenic, such as below 10 μg/L. So, we have developed two arsenic removal processes which are able to comply with more stringent arsenic regulations. They are the MF membrane process combined with chemical sludge adsorption and NF membrane process equipped with the vibratory shear enhanced process (VSEP). In this paper, we examine the performance of these new processes for the removal of arsenic ion of a low concentration from water. We found that chemical sludge produced in the conventional rapid sand filtration plants can effectively remove As (V) ions of H2AsO4- and HAsO42- through anion exchange reaction. The removal efficiency of MF membrane process combined with chemical sludge adsorption increased to about 36%, compared to MF membrane alone. The strong shear force on the NF membrane surface produced by vibration on the VSEP causes the concentration polarization layer to thin through increased back transport velocity of particles. So, it can remove even dissolved constituents effectively. Therefore, As (V) ions such as H2AsO4- and HAsO42- can be removed. The concentration of As (V) ions decreased from 50 μg/L to below 10 μg/L and condensation factor in recirculating water increased up to 7 times by using NF membrane equipped with VSEP.

Disposal of wastes resulting from arsenic removal processes

2003 ◽  
pp. 483-489 ◽  
Author(s):  
Michael J. MacPhee ◽  
John T. Novak ◽  
David A. Cornwell ◽  
Rodney N. Mutter
Keyword(s):  
Arsenic Removal ◽  
Removal Processes

Arsenic oxidation by UV radiation combined with hydrogen peroxide

2010 ◽  
Vol 61 (2) ◽  
pp. 339-344 ◽  
Author(s):  
S. Sorlini ◽  
F. Gialdini ◽  
M. Stefan
Keyword(s):  
Hydrogen Peroxide ◽  
Uv Radiation ◽  
Advanced Oxidation Processes ◽  
Arsenic Removal ◽  
Abundant Species ◽  
Arsenic In Groundwater ◽  
Groundwater Samples ◽  
Removal Technology ◽  
Arsenic Oxidation ◽  
Removal Processes

Arsenic is a widespread contaminant in the environment around the world. The most abundant species of arsenic in groundwater are arsenite [As(III)] and arsenate [As(V)]. Several arsenic removal processes can reach good removal yields only if arsenic is present as As(V). For this reason it is often necessary to proceed with a preliminary oxidation of As(III) to As(V) prior to the removal technology. Several studies have focused on arsenic oxidation with conventional reagents and advanced oxidation processes. In the present study the arsenic oxidation was evaluated using hydrogen peroxide, UV radiation and their combination in distilled and in real groundwater samples. Hydrogen peroxide and UV radiation alone are not effective at the arsenic oxidation. Good arsenic oxidation yields can be reached in presence of hydrogen peroxide combined with a high UV radiation dose (2,000 mJ/cm2). The quantum efficiencies for As(III) oxidation were calculated for both the UV photolysis and the UV/H2O2 processes.

Arsenic-related microorganisms in groundwater: a review on distribution, metabolic activities and potential use in arsenic removal processes

2017 ◽  
Vol 16 (4) ◽  
pp. 647-665 ◽  
Author(s):  
Simona Crognale ◽  
Stefano Amalfitano ◽  
Barbara Casentini ◽  
Stefano Fazi ◽  
Maurizio Petruccioli ◽  
...  
Keyword(s):  
Arsenic Removal ◽  
Removal Processes ◽  
Metabolic Activities ◽  
Potential Use

Concept for an integrated evaluation of arsenic removal technologies: demonstrated in a case study

2002 ◽  
Vol 2 (2) ◽  
pp. 267-274 ◽  
Author(s):  
A. Ruhland ◽  
M. Jekel
Keyword(s):  
Arsenic Removal ◽  
Evaluation Criteria ◽  
Treatment Plant ◽  
Ferric Hydroxide ◽  
Lower Saxony ◽  
Direct Filtration ◽  
Economical Evaluation ◽  
Removal Processes ◽  
Removal Technologies

A concept for a technical, ecological and economical evaluation of arsenic removal technologies is introduced and demonstrated on the basis of three alternative arsenic removal processes, direct filtration with FeCl3, adsorptive filtration with FeSO4 and adsorption on granulated ferric hydroxide, which were tested in a case study. A set of evaluation criteria is worked out and discussed with regard to the case study. Further, a multi criteria decision support instrument is described and used for identifying the preferential arsenic removal process. The ranking of the analysed alternatives is presented. The results base on the data of a full scale treatment plant of a water supplier in the Lower Saxony, Germany. The adsorption on granulated ferric hydroxide is ranked as preferential process - alternative for arsenic removal on the conditions of the case study.

An overview of arsenic removal processes

Desalination ◽  
1995 ◽  
Vol 103 (1-2) ◽  
pp. 79-88 ◽  
Author(s):  
Ernest O. Kartinen ◽  
Christopher J. Martin
Keyword(s):  
Arsenic Removal ◽  
Removal Processes

scholarly journals An overview of main arsenic removal technologies

2018 ◽  
Vol 11 (2) ◽  
pp. 107-113 ◽  
Author(s):  
Ronald Zakhar ◽  
Ján Derco ◽  
František Čacho
Keyword(s):  
Drinking Water ◽  
Membrane Filtration ◽  
Arsenic Removal ◽  
Chemical Precipitation ◽  
Contaminated Water ◽  
The World ◽  
Removal Processes ◽  
Removal Technologies ◽  
High Concentrations ◽  
Exchange Membrane

Abstract Arsenic (As) is metalloid, naturally present in the environment but also introduced by human activities. It is toxic and carcinogenic and its exposure to low or high concentrations can be fatal to human health. Arsenic contamination in drinking water threatens more than 150 million peoples all over the world. Therefore, treatment of As contaminated water is of unquestionable importance. The present review begins with an overview of As chemistry, distribution and toxicity, which are relevant aspects to understand and develop remediation techniques. The most common As removal processes (chemical precipitation, adsorption, ion exchange, membrane filtration, phytoremediation and electrocoagulation) are presented with discussion of their advantages, drawbacks and the main recent achievements.

Disposing of John Lindley's library and herbarium: the offer to Australia

2008 ◽  
Vol 35 (1) ◽  
pp. 15-70 ◽  
Author(s):  
A. M. LUCAS
Keyword(s):  
United Kingdom ◽  
Botanic Gardens ◽  
Final Disposal ◽  
The United Kingdom ◽  
Royal Horticultural Society ◽  
Royal Botanic Gardens ◽  
United Kingdom Government ◽  
The University ◽  
Joseph Hooker

Shortly before he died, John Lindley decided to dispose of his herbarium and botanical library. He sold his orchid herbarium to the United Kingdom government for deposit at the Royal Botanic Gardens, Kew, and then offered his library and the remainder of his herbarium to Ferdinand Mueller in Melbourne. On his behalf, Joseph Hooker had earlier unsuccessfully offered the library and remnant herbarium to the University of Sydney, using the good offices of Sir Charles Nicholson. Although neither the University of Sydney nor Mueller was able to raise the necessary funds to purchase either collection, the correspondence allows a reconstruction of a catalogue of Lindley's library, and poses some questions about Joseph Hooker's motives in attempting to dispose of Lindley's material outside the United Kingdom. The final disposal of the herbarium to Cambridge and previous analyses of the purchase of his Library for the Royal Horticultural Society are discussed. A list of the works from Lindley's library offered for sale to Australia is appended.

IRON OXIDES FROM ELECTROFILTER ASH FOR WATER TREATMENT (ARSENIC REMOVAL)

2009 ◽  
Vol 8 (4) ◽  
pp. 895-900 ◽  
Author(s):  
Ionel Balcu ◽  
Adina Segneanu ◽  
Marius Mirica ◽  
Mirela Iorga ◽  
Catalin Badea ◽  
...  
Keyword(s):  
Water Treatment ◽  
Iron Oxides ◽  
Arsenic Removal
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