Artificial Floating Island with Vetiver for Treatment of Arsenic-Contaminated Water: A Real Scale Study in High-Andean Reservoir

Arsenic found in agriculture water reservoirs represents a threat to water security and safe agricultural products in developing countries. Small farms do not implement traditional water treatments due to the high cost; hence, a nature-based solution is an alternative to tackling this challenge. This paper investigated the potential of artificial floating island with Vetiver (AFIV) for the geogenic arsenic removal present in the reservoir of the Ilinizas páramo in Ecuador. We constructed two AFIV systems using PVC pipes in a reservoir batch type with a 3.6 m3 treatment capacity. Arsenic and iron were analyzed in duplicated every 30 days at the affluent and effluent through 120 days. The average remediation of arsenic was recorded as 97% in water and 84% in sediment, while the average remediation of iron was 87% in sediment. The survival rate of macrophytes was 92%; they accumulated arsenic in its roots that acted as a barrier against the translocation. The research demonstrated that the use of AFIV has the potential to rehabilitate reservoirs contaminated with arsenic under adverse climatic conditions such as the páramo ecosystem.

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Arsenic removal from contaminated water by ultrafine δ-FeOOH adsorbents

Chemical Engineering Journal ◽

10.1016/j.cej.2013.10.006 ◽

2014 ◽

Vol 237 ◽

pp. 47-54 ◽

Cited By ~ 81

Author(s):

Márcia C.S. Faria ◽

Renedy S. Rosemberg ◽

Cleide A. Bomfeti ◽

Douglas S. Monteiro ◽

Fernando Barbosa ◽

...

Keyword(s):

Arsenic Removal ◽

Contaminated Water

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Synthesis of Micro/nano Urchin-like VO2 Particles and Its Decolorization of Methylene Blue

VNU Journal of Science Mathematics - Physics ◽

10.25073/2588-1124/vnumap.4343 ◽

2019 ◽

Vol 35 (3) ◽

Author(s):

Nguyen The Manh ◽

Duong Hong Quan ◽

Vu Thi Ngoc Minh ◽

Vuong Pham Hung

Keyword(s):

Methylene Blue ◽

Sodium Dodecyl ◽

Adsorption Properties ◽

Contaminated Water ◽

Potential Applications ◽

Synthesis Procedure ◽

Water Treatments ◽

Sds Surfactant ◽

Mb Adsorption

Micro/nano urchin-like VO2 particles were synthesized successfully by hydrothermal method. Vanadium pentoxide (V2O5), oxalic acid (C2H2O4) and sodium dodecyl sulfate (SDS) surfactant were used as reagents for the synthesis of VO2. In this article, we have reported the synthesis procedure of VO2 nanorods and micro/nano urchin-like VO2 structure and evaluating the methylene blue (MB) adsorption properties. Morphology and particle size of VO2 were observed by FE-SEM. The phase formation of VO2 was studied by XRD. Raman spectroscopy was also used for characterization of VO2. Micro/nano urchin-like VO2 structure was showed good MB adsorption properties that have potential applications in dye-contaminated water treatments.

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Evaluation of modified montmorillonite with di-cationic surfactants as efficient and environmentally friendly adsorbents for arsenic removal from contaminated water

Water Science & Technology Water Supply ◽

10.2166/ws.2017.077 ◽

2017 ◽

Vol 18 (2) ◽

pp. 460-472 ◽

Cited By ~ 4

Author(s):

E. Shokri ◽

R. Yegani ◽

B. Pourabbas ◽

B. Ghofrani

Keyword(s):

Contact Time ◽

Arsenic Removal ◽

Environmentally Friendly ◽

Contaminated Water ◽

X Ray Diffraction ◽

Solution Ph ◽

Modified Montmorillonite ◽

Adsorption Capacities ◽

Modified Adsorbents ◽

Adsorption Desorption

Abstract In this work, montmorillonite (Mt) was modified by environmentally friendly arginine (Arg) and lysine (Lys) amino acids with di-cationic groups for arsenic removal from contaminated water. The modified Mts were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, zeta potential and thermal analysis. The adsorption of As(V) onto modified Mts as a function of initial As(V) concentration, contact time and solution pH was investigated. The removal efficiency was increased with increasing the As(V) concentration and contact time; however, it was decreased with increasing solution pH. The maximum As(V) adsorption capacities of Mt-Arg and Mt-Lys were 11.5 and 11 mg/g, respectively, which were five times larger than pristine Mt. The high adsorption capacity makes them promising candidates for arsenic removal from contaminated water. The regeneration studies were carried out up to 10 cycles for both modified Mts. The obtained results confirmed that the modified adsorbents could also be effectively used for As(V) removal from water for multiple adsorption – desorption cycles.

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Design of an advanced hot box-cold box with full climatic control to test heat, air and moisture transport through real scale building elements

E3S Web of Conferences ◽

10.1051/e3sconf/202017219008 ◽

2020 ◽

Vol 172 ◽

pp. 19008

Author(s):

David Daems ◽

Antoine Tilmans ◽

Timo De Mets ◽

Xavier Loncour

Keyword(s):

Climatic Conditions ◽

Test Facility ◽

Solar Simulator ◽

Climatic Control ◽

Critical Issues ◽

Test Elements ◽

Cold Chamber ◽

Real Scale ◽

Cold Box ◽

Building Elements

A versatile hot box-cold box test facility called HAMSTER enables to evaluate the energy and hygrothermal performance of up to 3m high, 3m wide and 3.6m deep building test elements including walls, flat or pitched roofs and floors. This equipment allows for the precise measurement of thermal performance according to standards. It also allows for the study of heat, air and moisture phenomena taking place in building elements under realistic climatic conditions including the effects of rain, sun or wind. Interior and exterior climates are simulated in, respectively, the hot and cold chambers by controlling the temperature, relative humidity, pressure difference between both chambers, infra-red or solar simulator heating and water spraying in the cold chamber. Critical issues that have been solved during the design and construction phases in order to reach both the required performances and the versatility of the test facility are discussed.

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Nanofiltration for Arsenic Removal: Challenges, Recent Developments, and Perspectives

Nanomaterials ◽

10.3390/nano10071323 ◽

2020 ◽

Vol 10 (7) ◽

pp. 1323 ◽

Cited By ~ 1

Author(s):

TA Siddique ◽

Naba K. Dutta ◽

Namita Roy Choudhury

Keyword(s):

Drinking Water ◽

Arsenic Removal ◽

Environmental Concern ◽

Low Cost ◽

Inorganic Arsenic ◽

Water Security ◽

Polymer Nanocomposite ◽

Life Forms ◽

Current Status ◽

The Status

Arsenic (As) removal is of major significance because inorganic arsenic is highly toxic to all life forms, is a confirmed carcinogen, and is of significant environmental concern. As contamination in drinking water alone threatens more than 150 million people all over the world. Therefore, several conventional methods such as oxidation, coagulation, adsorption, etc., have been implemented for As removal, but due to their cost-maintenance limitations; there is a drive for advanced, low cost nanofiltration membrane-based technology. Thus, in order to address the increasing demand of fresh and drinking water, this review focuses on advanced nanofiltration (NF) strategy for As removal to safeguard water security. The review concentrates on different types of NF membranes, membrane fabrication processes, and their mechanism and efficiency of performance for removing As from contaminated water. The article provides an overview of the current status of polymer-, polymer composite-, and polymer nanocomposite-based NF membranes, to assess the status of nanomaterial-facilitated NF membranes and to incite progress in this area. Finally, future perspectives and future trends are highlighted.

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Active Species Generated by a Pulsed Arc Electrohydraulic Discharge Plasma Channel in Contaminated Water Treatments

Plasma Chemistry and Plasma Processing ◽

10.1007/s11090-011-9346-8 ◽

2012 ◽

Vol 32 (2) ◽

pp. 343-358 ◽

Cited By ~ 17

Author(s):

O. L. Li ◽

N. Takeuchi ◽

Z. He ◽

Y. Guo ◽

K. Yasuoka ◽

...

Keyword(s):

Discharge Plasma ◽

Plasma Channel ◽

Active Species ◽

Contaminated Water ◽

Water Treatments ◽

Pulsed Arc ◽

Pulsed Arc Electrohydraulic Discharge ◽

Electrohydraulic Discharge

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Lake Restoration of Arsenic Pollution by Manganese Ore

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.1659 ◽

2013 ◽

Vol 726-731 ◽

pp. 1659-1663

Author(s):

Ning Xin Chen ◽

Yong Bing Huang ◽

Jing Dong

Keyword(s):

Removal Efficiency ◽

Adsorption Process ◽

Arsenic Removal ◽

Freundlich Isotherm ◽

Order Reaction ◽

Contaminated Water ◽

Manganese Ore ◽

Arsenic Pollution ◽

First Order ◽

Acidic Conditions

Using manganese ore coated with small stones to adsorb arsenic from the contaminated water samples of Yangzonghai Lake, and several factors that may have impacts on the arsenic removal efficiency are analyzed. The result shows that the new adsorbent material has a great effect on arsenic removal. Temperature's effect on arsenic removal efficiency is not obvious. The arsenic removal efficiency increased dramatically in accordance with residence time within 0-660s, and then stabilized. The adsorption process is better when conducted in acidic conditions, the maximum adsorption rate reached 83.0% with the pH of 3.0 and it reached the minimum value of 14.7% when pH is 10. Fe3+ and Ca2+ can slightly promote manganese ore's adsorption of arsenic, and with anions CO32-, SiO32- , efficiency was slightly reduced. When fitting the kinetics data of arsenic removal by coated manganese ore, the adsorption process is correspondent with first-order reaction kinetics model. The adsorption isotherm is more close to the Freundlich isotherm model.

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Assessment of Water Security in Socially Excluded Areas in Kolkata, India: An Approach Focusing on Water, Sanitation and Hygiene

Water ◽

10.3390/w12030746 ◽

2020 ◽

Vol 12 (3) ◽

pp. 746 ◽

Cited By ~ 2

Author(s):

Subham Mukherjee ◽

Trude Sundberg ◽

Brigitta Schütt

Keyword(s):

Social Issues ◽

Water Security ◽

Household Survey ◽

Contaminated Water ◽

Urban Landscapes ◽

Slum Dwellers ◽

Sanitation And Hygiene ◽

Socially Excluded ◽

Food Washing ◽

Deprived Areas

Water security is essential not only to ensure the availability and accessibility of water for drinking, producing food, washing, but also to maintain both human and environmental health. The 2011 Census of India reveals that 17.4% of urban households in India live in deprived areas in urban landscapes which are designated as slums in the Census dataset. The increasing number of people living in these areas poses serious challenges to the provision of basic urban water, sanitation and hygiene (WaSH) services. Perceived susceptibility of risks from contaminated water and lack of proper sanitation and hygiene will be addressed in the light of social exclusion factors. This study attempts to assess the present situation of water, sanitation and required hygiene provisions within the areas defined as slums by the Census of India 2011 in Kolkata, India. Based on the results obtained from the datasets from the census, and a household survey, we identified a lack of supplies associated with WaSH provisions in these areas of Kolkata. The WaSH provisions in the slum areas of Kolkata city are facing various issues related to regularity, quality and quantity of supplied water. Additionally, there is poor maintenance of existing WaSH services including latrine facilities and per capita allocation of a sustainable water security among the slum dwellers. By adding to our understanding of the importance of factors such as gender, religions, and knowledge of drinking water in deprived areas, the study analyses the links between both physical and social issues determining vulnerability and presence of deprivation associated with basic WaSH provisions as human rights of slum communities.

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Arsenic removal from arsenic-contaminated water by biological arsenite oxidation and chemical ferrous iron oxidation using a down-flow hanging sponge reactor

Water Science & Technology Water Supply ◽

10.2166/ws.2017.025 ◽

2017 ◽

Vol 17 (5) ◽

pp. 1249-1259 ◽

Cited By ~ 6

Author(s):

Nao Kamei-Ishikawa ◽

Nami Segawa ◽

Daisuke Yamazaki ◽

Ayumi Ito ◽

Teruyuki Umita

Keyword(s):

Arsenic Removal ◽

Low Cost ◽

Iron Hydroxide ◽

Iron Oxidation ◽

Quality Standards ◽

Small Scale ◽

Contaminated Water ◽

Water Quality Standards ◽

Ferrous Iron Oxidation ◽

Arsenite Oxidizing Bacteria

The down-flow hanging sponge (DHS) reactor was used for continuous As removal treatment of As-contaminated water. The treatment scheme was: (1) As(III) in contaminated water is oxidized by arsenite-oxidizing bacteria fixed in the sponges in the reactor; (2) Fe(II) naturally existing in the water is oxidized by dissolved oxygen; (3) Fe(III) is precipitated as iron hydroxide and As(V) is co-precipitated with the iron hydroxide; and finally (4) the co-precipitates are fixed in the sponges. This system could remove As from As-contaminated water on a small scale and at low cost. The results showed that, after using the DHS reactor, As and Fe concentrations in the treated water were lower than water quality standards for drinking water when Fe(II) concentration in the influent was lower than 10 mg/L and the Fe/As ratio was higher than 6.67–8.42, with dependence on the Fe concentration. Additionally, even if Fe concentration is higher than 10 mg/L, the treatment system is still applicable if the pH of the influent is higher than 7 or the retention time is longer than 2 h.

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