COMPARISON OF SOME NON-CONVENTIONAL SORBENTS FOR THE REMOVAL OF ARSENIC FROM WATERS

2016 ◽  
Vol 15 (8) ◽  
pp. 1721-1728
Author(s):  
Pavel Janos ◽  
Alexandra Eletskaya ◽  
Vera Pilarova
Keyword(s):  
Removal Of Arsenic

REMOVAL OF ARSENIC AND HEAVY METALS FROM ARSENICCONTAINING ACID WASTEWATER WITH IRON SALT AND LIME

2019 ◽  
Vol 18 (12) ◽  
pp. 2655-2662
Author(s):  
Yongliang Wang ◽  
Peiwei Han ◽  
Yonggang Lu ◽  
Li Xiao ◽  
Yingchao Du ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Iron Salt ◽  
Removal Of Arsenic

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.

EVALUATION OF REACTIVE MIXTURES FOR REMOVAL OF ARSENIC FROM GROUNDWATER

2019 ◽  
Author(s):  
Joanne U. Angai ◽  
◽  
Carol J. Ptacek ◽  
Brent R. Verbuyst ◽  
Jeff G. Bain ◽  
...  
Keyword(s):  
Removal Of Arsenic

Removal of Arsenic from Water Using a Composite of Iron–Manganese Oxide Incorporated Active Rice Husk Silica

2021 ◽  
Vol 49 (4) ◽  
pp. 2000233
Author(s):  
Trung Huu Bui ◽  
Van Sy Pham ◽  
Nguyen Thanh‐Nho ◽  
Quoc An Trieu
Keyword(s):  
Manganese Oxide ◽  
Rice Husk ◽  
Rice Husk Silica ◽  
Removal Of Arsenic ◽  
Iron Manganese

Potential of arsenic bioremediation by a cyanobacterium isolated from the Salado River in the Atacama Desert

2021 ◽  
Vol 43 (2) ◽  
pp. 156-160
Author(s):  
Pablo Pérez-Portilla ◽  
Juan Araya ◽  
Karem Gallardo ◽  
Adriana Aránguiz-Acuña
Keyword(s):  
Atacama Desert ◽  
Aquatic Systems ◽  
Arid Environments ◽  
Northern Chile ◽  
Evolutionary Mechanisms ◽  
Alkaline Conditions ◽  
Ph Conditions ◽  
Removal Of Arsenic ◽  
Salado River ◽  
Over Time

Abstract Cyanobacteria and microalgae are recognized as excellent metal(loid)s-bioremediators of aquatic systems. We isolated a cyanobacterium from the Salado River in the Atacama Desert, northern Chile, which was identified as Cyanobium sp. Growth inhibition bioassays were conducted with arsenic and cadmium, and tolerance of Cyanobium to these metals was estimated. Removal of arsenic was assessed under different pH conditions and over time. We showed that the Cyanobium strain isolated from the Salado River has a greater tolerance to the arsenic and cadmium compounds than other species commonly used in metal(loid)s-bioremediation. Removal of up to 90% of arsenic was obtained in alkaline conditions, within the first 3 hours of exposure suggesting that Cyanobium sp. isolated from the Atacama Desert could be further studied with biotechnological purposes and to understand the evolutionary mechanisms of adaption to arid environments.

Removal of arsenic from “Dirty acid” wastewater via Waelz slag and the recovery of valuable metals

2021 ◽  
Vol 200 ◽  
pp. 105562
Author(s):  
Tao Zeng ◽  
Zhigan Deng ◽  
Fan Zhang ◽  
Gang Fan ◽  
Chang Wei ◽  
...  
Keyword(s):  
Valuable Metals ◽  
Removal Of Arsenic
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