Assessment of Aspergillus niger Strain’s Suitability for Arsenate-Contaminated Water Treatment and Adsorbent Recycling via Bioextraction in a Laboratory-Scale Experiment

In this work, the viability of bioaccumulation and bioextraction processes for arsenic removal from contaminated waters, as well as the recycling of arsenate-treated amorphous ferric oxyhydroxide adsorbent (FeOOH) were evaluated using the common soil microscopic filamentous fungus Aspergillus niger. After treating the contaminated arsenate solution (100 mg As L−1) with FeOOH, the remaining solution was exposed to the growing fungus during a static 19-day cultivation period to further decrease the arsenic concentration. Our data indicated that although the FeOOH adsorbent is suitable for arsenate removal with up to 84% removal efficiency, the fungus was capable of accumulating only up to 13.2% of the remaining arsenic from the culture media. This shows that the fungus A. niger, although highly praised for its application in environmental biotechnology research, was insufficient for decreasing the arsenic contamination to an environmentally acceptable level. However, the bioextraction of arsenic from arsenate-treated FeOOH proved relatively effective for reuse of the adsorbent. Due to its production of acidic metabolites, which decreased pH below 2.7, the fungal strain was capable of removing of up to 98.2% of arsenic from the arsenate-treated FeOOH adsorbent.

Download Full-text

Arsenic Removal by Precipitation with Calcium Phosphate Hydroxyapatite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.506.413 ◽

2012 ◽

Vol 506 ◽

pp. 413-416 ◽

Cited By ~ 5

Author(s):

W. Dungkaew ◽

K.J. Haller ◽

A.E. Flood ◽

J.F. Scamehorn

Keyword(s):

Calcium Phosphate ◽

Water Sample ◽

Removal Efficiency ◽

Arsenic Removal ◽

Arsenic Speciation ◽

Arsenic Concentration ◽

Contaminated Water ◽

Low Levels ◽

Removal Of Arsenic ◽

Key Parameter

The removal of arsenic from synthetic arsenic contaminated water sample by precipitating arsenic (in the form of arsenate oxyanion) with calcium phosphate hydroxyapatite, HAp, was studied under conditions that induce arsenate incorporated calcium phosphate hydroxyapatite, Ca (P/As)HAp, to form. Arsenate is able to substitute for a fraction of the phosphate in HAp host material as it forms. Consequently, arsenic is successfully removed from the contaminated water achieving up to 99% arsenic removal from 25 ppm initial arsenic concentration. The Ca:(P+As) and P:As mole ratios were found to play an important role in arsenic removal efficiency. Higher Ca:(P+As) and P:As mole ratios give higher arsenic removal efficiency. Surprisingly, the pH of the initial anion solution, a key parameter in arsenic speciation, was found to not have a significant effect on arsenic removal by this process. The advantage of this process is that the precipitation can occur rapidly at relatively low levels of arsenic contamination, implying an easy and inexpensive process for arsenic removal can be developed based on this approach.

Download Full-text

As(III) Removal by Dynamic Adsorption onto Amberlite XAD7 Functionalized with Crown Ether and Doped with Fe(III) Ions

Revista de Chimie ◽

10.37358/rc.19.7.7333 ◽

2019 ◽

Vol 70 (7) ◽

pp. 2330-2334

Author(s):

Mihaela Ciopec ◽

Adina Negrea ◽

Narcis Duteanu ◽

Corneliu Mircea Davidescu ◽

Iosif Hulka ◽

...

Keyword(s):

Adsorption Process ◽

Arsenic Removal ◽

Arsenic Concentration ◽

Fixed Bed ◽

World Health ◽

Arsenic Content ◽

Arsenic Adsorption ◽

Stage Of Development ◽

Wide Range ◽

Health Organization

Arsenic content in groundwater�s present a wide range of concentration, ranging from hundreds of micrograms to thousands of micrograms of arsenic per litter, while the maximum permitted arsenic concentration established by World Health Organization (WHO) is 10 mg L-1. According to the WHO all people, regardless of their stage of development and their social economic condition, have the right to have access to adequate drinking water. The most efficient and economic technique used for arsenic removal is represented by adsorption. In order to make this remediation technique more affordable and environmentally friendly is important to new materials with advance adsorbent properties. Novelty of present paper is represented by the usage of a new adsorbent material obtained by physical - chemical modification of Amberlite XAD polymers using crown ethers followed by iron doping, due to well-known affinity of arsenic for iron ions. Present paper aims to test the obtained modified Amberlite polymer for arsenic removal from real groundwater by using adsorption in a fixed bed column, establishing in this way a mechanism for the adsorption process. During experimental work was studied the influence of competing ions from real water into the arsenic adsorption process.

Download Full-text

Evaluation of Fe-Mg Binary Oxide for As (III) Adsorption—Synthesis, Characterization and Kinetic Modelling

Nanomaterials ◽

10.3390/nano11030805 ◽

2021 ◽

Vol 11 (3) ◽

pp. 805

Author(s):

Saif Ullah Khan ◽

Rumman Zaidi ◽

Feroz Shaik ◽

Izharul Haq Farooqi ◽

Ameer Azam ◽

...

Keyword(s):

Arsenic Removal ◽

Kinetic Modelling ◽

Arsenic Concentration ◽

Experimental Studies ◽

Precipitation Method ◽

Arsenic Adsorption ◽

Adsorbent Dosage ◽

X Ray ◽

Co Precipitation ◽

Contaminated Waters

Nanotechnology has received much attention in treating contaminated waters. In the present study, a facile co-precipitation method was employed to synthesize a novel iron and magnesium based binary metal oxide using a stoichiometrically fixed amount of FeNO3.9H2O and MgNO3.6H2O in a proportion of molar concentration 1:1 and was later evaluated in removing As (III) from contaminated waters. Characterization of the prepared nanomaterial was done using X-ray diffraction (XRD), scanning electron microscopy (SEM), Energy Dispersive X-Ray Analysis (EDAX) and ultraviolet–visible spectrophotometry (UV-VIS). Experimental studies on batch scale were carried out, examining the effect of varying initial concentrations of metal, adsorbent dosage, application time and initial pH on removal efficiency. Arsenic removal increased on increasing adsorbent dosage (0.1–1 g/L) but trend reversed on increasing initial arsenic concentration attaining qmax of 263.20 mg/g. Adsorption was quite efficient in pH range 4–8. Freundlich fitted better for adsorption isotherm along with following Pseudo-2nd order kinetics. The reusability and effect of co-existing ions on arsenic adsorption, namely SO42−, CO32− and PO43− were also explored with reusability in 1st and 2nd cycles attained adsorptive removal up to 77% and 64% respectively. The prepared nano-adsorbent showed promising results in terms of high arsenic uptake (qmax of 263.20 mg/g) along with facile and cost-effective synthesis. Thus, the co-precipitation technique used in this work is a simple one step procedure without any use of any precursor as compared to most of the other procedures used for synthesis.

Download Full-text

Dissimilatory Iron-Reducing Microorganisms Are Present and Active in the Sediments of the Doce River and Tributaries Impacted by Iron Mine Tailings from the Collapsed Fundão Dam (Mariana, MG, Brazil)

Minerals ◽

10.3390/min11030244 ◽

2021 ◽

Vol 11 (3) ◽

pp. 244

Author(s):

Carolina N. Keim ◽

Jilder D. P. Serna ◽

Daniel Acosta-Avalos ◽

Reiner Neumann ◽

Alex S. Silva ◽

...

Keyword(s):

Bottom Sediments ◽

Magnetic Measurements ◽

Culture Media ◽

X Ray Diffraction ◽

X Ray ◽

Ferric Oxyhydroxide ◽

Transmission Electron ◽

Iron Mine ◽

Organic Matter Oxidation ◽

Doce River

On 5 November 2015, a large tailing deposit failed in Brazil, releasing an estimated 32.6 to 62 million m3 of iron mining tailings into the environment. Tailings from the Fundão Dam flowed down through the Gualaxo do Norte and Carmo riverbeds and floodplains and reached the Doce River. Since then, bottom sediments have become enriched in Fe(III) oxyhydroxides. Dissimilatory iron-reducing microorganisms (DIRMs) are anaerobes able to couple organic matter oxidation to Fe(III) reduction, producing CO2 and Fe(II), which can precipitate as magnetite (FeO·Fe2O3) and other Fe(II) minerals. In this work, we investigated the presence of DIRMs in affected and non-affected bottom sediments of the Gualaxo do Norte and Doce Rivers. The increase in Fe(II) concentrations in culture media over time indicated the presence of Fe(III)-reducing microorganisms in all sediments tested, which could reduce Fe(III) from both tailings and amorphous ferric oxyhydroxide. Half of our enrichment cultures converted amorphous Fe(III) oxyhydroxide into magnetite, which was characterized by X-ray diffraction, transmission electron microscopy, and magnetic measurements. The conversion of solid Fe(III) phases to soluble Fe(II) and/or magnetite is characteristic of DIRM cultures. The presence of DIRMs in the sediments of the Doce River and tributaries points to the possibility of reductive dissolution of goethite (α-FeOOH) and/or hematite (α-Fe2O3) from sediments, along with the consumption of organics, release of trace elements, and impairment of water quality.

Download Full-text

Producing biodiesel from cottonseed oil using Rhizopus oryzae ATCC #34612 whole cell biocatalysts: Culture media and cultivation period optimization

Energy for Sustainable Development ◽

10.1016/j.esd.2013.03.009 ◽

2013 ◽

Vol 17 (4) ◽

pp. 331-336 ◽

Cited By ~ 15

Author(s):

Sneha Athalye ◽

Ratna Sharma-Shivappa ◽

Steven Peretti ◽

Praveen Kolar ◽

Jack P. Davis

Keyword(s):

Rhizopus Oryzae ◽

Culture Media ◽

Cottonseed Oil ◽

Whole Cell ◽

Cultivation Period

Download Full-text

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

Download Full-text

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.

Download Full-text

Arsenic removal by ferric-chloride coagulation – effect of phosphate, bicarbonate and silicate

Water Science & Technology ◽

10.2166/wst.2011.419 ◽

2011 ◽

Vol 64 (5) ◽

pp. 1046-1055 ◽

Cited By ~ 11

Author(s):

Dóra Laky ◽

István Licskó

Keyword(s):

Adverse Effect ◽

Arsenic Removal ◽

Linear Regression Analysis ◽

Arsenic Concentration ◽

Ferric Hydroxide ◽

Multiple Linear Regression Analysis ◽

Ph Values ◽

Robust Model ◽

Coagulant Dosage ◽

Negative Effect

Jar tests with synthetic water were carried out in order to investigate the effect of phosphate, bicarbonate and silicate on arsenic removal efficiency by in-situ formed ferric hydroxide. Above 12 mg C/L inorganic carbon concentration, the adverse effect of bicarbonate was definite, and resulted in higher remaining arsenic concentration. At all pH values (7.5–7.8) and coagulant dosages (0.84–3.00 mg/L Fe) tested, the negative effect of phosphate on arsenic removal was also evident. In the presence of silicate small ferric-hydroxide colloids were formed, which were able to go through the 0.45 μm pore-size membrane. Compared to silicate-free systems, 2.5–3.5 times higher coagulant dose was needed to achieve the target arsenic concentration in the presence of 14–23 mg/L Si. At higher pH values the adverse effect of silicate was even more significant. All data were merged and multiple linear regression analysis was carried out in order to build up a robust model to predict the residual arsenic concentration if the raw water contains 50–60 μg/L initial arsenic concentration. The estimation was based on the following variables: PO4-P concentration, final pH, Si concentration, Fe(III) dose. The most important influencing factors proved to be the silicate concentration and applied coagulant dosage.

Download Full-text

Comparative Study of Three Different BACTEC Culture Media for the Detection of Bacteremia in Ambulatory and Hospitalized Children

Canadian Journal of Infectious Diseases ◽

10.1155/1998/603898 ◽

1998 ◽

Vol 9 (2) ◽

pp. 77-82 ◽

Cited By ~ 1

Author(s):

Deirdre L Church ◽

H Dele Davies ◽

G Cadrain ◽

Cynthia L Trevenen

Keyword(s):

Emergency Department ◽

Blood Culture ◽

Culture Media ◽

Optimal Recovery ◽

Pediatric Care ◽

Hospitalized Children ◽

Anaerobic Bottle ◽

The Common ◽

Clinically Significant ◽

Group D

To compare the yield of two aerobic and an anaerobic BACTEC blood culture media in detecting bacteremia in ambulatory and hospitalized care settings at a children’s hospital, a prospective cohort study was completed. Over an 18-month period, equal blood volumes (minimum of 1 mL/bottle) were inoculated into a three-bottle culture set including aerobic BACTEC NR 6A, aerobic BACTEC PEDS Plus and anaerobic NR 7A broths. Chart reviews were completed on all children with bacteremia to determine whether the isolate was clinically significant based on predefined criteria. Among 5328 evaluable blood culture sets, 323 clinically significant organisms (110 from ambulatory and 213 from hospitalized children) were isolated. MostStreptococcus pneumoniae,Haemophilusspecies, andNeisseriaorMoraxellaspecies were recovered from children attending the emergency department or out-patient clinics. Important isolates in hospitalized children included most of the staphylococci andEnterobacteriaceae, and all group D enterococci, Gram-negative nonfermentative bacilli and allCandidaspecies. Overall, significantly more isolates were detected only in the anaerobic bottle from ambulatory children (P<0.0001), including 13 of 54 (24%) patients withS pneumoniaebacteremias presenting to the emergency department. This study indicated that different BACTEC blood culture media combinations are needed in ambulatory and hospitalized pediatric care settings to ensure the optimal recovery of all types of isolates. Whereas aerobic blood culture bottles are adequate for detection of bacteremia in hospitalized children, the common occurrence of fastidious organisms mandates the need for a combined aerobic/anaerobic culture set in ambulatory pediatric care settings.

Download Full-text

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.

Download Full-text