Four years of development and field-testing of IHE arsenic removal family filter in rural Bangladesh

2008 ◽  
Vol 58 (1) ◽  
pp. 53-58 ◽  
Author(s):  
B. Petrusevski ◽  
S. Sharma ◽  
W. G. van der Meer ◽  
F. Kruis ◽  
M. Khan ◽  
...  
Keyword(s):  
Arsenic Removal ◽  
Local Population ◽  
Iron Concentration ◽  
Arsenic Concentration ◽  
Field Testing ◽  
Arsenic Adsorption ◽  
Arsenic Level ◽  
Rural Bangladesh ◽  
Removal Capacity ◽  
Guideline Value

UNESCO-IHE has been developing an arsenic removal family filter with a capacity of 100 L/day based on arsenic adsorption onto iron oxide coated sand, a by-product of iron removal plants. The longer term and field conditions performance of the third generation of eleven family filters prototypes were tested in rural Bangladesh for 30 months. All filters achieved initially highly effective arsenic removal irrespective of arsenic concentration and groundwater composition. Arsenic level in filtrate reached 10 μg/l after 50 days of operation at one testing site and after 18 months of continuous operation at other 3 testing sites. Arsenic level at other 7 sites remained below the WHO guideline value till the end of study. Positive correlation was found between arsenic removal capacity of the filter and iron concentration in groundwater. In addition to arsenic, iron present in groundwater at all testing sites was also removed highly effectively. Manganese removal with IHE family filter was effective only when treating groundwater with low ammonia. A simple polishing sand filter, after IHE family filter, resulted in consistent and effective removal of manganese. IHE family filters were easy to operate and were well accepted by the local population.

scholarly journals MODIFICATION OF OXIDIZED ACTIVATED CARBON SURFACE BY Fe AND Mn FOR ARSENIC REMOVAL FROM AQUEROUS SOLUTION

2018 ◽  
Vol 56 (2C) ◽  
pp. 80-87
Author(s):  
Pham Thi Hai Thinh
Keyword(s):  
Activated Carbon ◽  
Arsenic Removal ◽  
Arsenic Concentration ◽  
Carbon Surface ◽  
Batch Adsorption ◽  
Arsenic Adsorption ◽  
Removal Capacity ◽  
Adsorption Capacities ◽  
Oxidation Efficiency ◽  
Oxidized Activated Carbon

Carboxylate groups on oxidized activated carbon surface were transformed to the forms of Mn2+ and Fe3+ (signed as OAC-Mn and OAC-Fe respectively) through multi-step procedure. This modified activated carbon then was used as an adsorption material for arsenic removing from aqueous solution. Synthetic water containing As(III) and As(V) was used for study of arsenic adsorption capacities of OAC-Fe and OAC-Mn. The similar study had also been done with original granular activated carbon for comparison. The effects of modified metals onto oxidized activated carbon, metals doses and initial arsenic concentration on the removal of As(III), As(V) have been surveyed and discussed. Batch adsorption experiments were carried out with arsenic concentration in the range of 1 – 50 mg/l. Langmuir models were used for the adsorption isotherm screening. The results showed that both of OAC-Fe and OAC-Mn have good adsorption capacities for As(III) but OAC-Fe has a greater removal capacity for As(V) than OAC-Mn. OAC-Mn was identified as a good material for the of As(III) removal, because of its oxidation efficiency of As(III) to As(V) during adsorption process.

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

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.

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

Nanomaterials ◽  
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.

scholarly journals Adsorption of arsenic and phosphate from groundwater onto a calcined laterite as fixed bed in column experiments

2020 ◽  
Vol 8 (2) ◽  
pp. 227-243
Author(s):  
Yacouba Sanou ◽  
Raymond Kabore ◽  
Samuel Pare
Keyword(s):  
Arsenic Removal ◽  
Arsenic Concentration ◽  
Fixed Bed ◽  
Column Experiments ◽  
Arsenic Adsorption ◽  
Experimental Conditions ◽  
Ph Values ◽  
Naoh Solution ◽  
Removal Of Arsenic ◽  
Maximum Removal

This work was focused on laterite soil as adsorbent for the removal of arsenic and phosphate from groundwater using column experiments. Results revealed a decrease of arsenic removal efficiency from 100 to 79% with flow rate increasing. Maximum removal of 100% for arsenic and 85% for phosphates was obtained for pH values between 3.5 and 6. The increase of initial arsenic concentration and phosphate amount caused an increase of arsenic adsorption up to 24 µg/g while 58.5 µg/g for phosphate. NaOH solution could desorb 86.8% of arsenic and the reuse of regenerated laterite indicated its efficiency in same experimental conditions.

Hand-pump subsurface arsenic removal: the effect of groundwater conditions and intermittent operation

2013 ◽  
Vol 14 (1) ◽  
pp. 119-126 ◽  
Author(s):  
S. C. Borges Freitas ◽  
D. van Halem ◽  
M. M. Rahman ◽  
J. Q. J. C. Verberk ◽  
A. B. M. Badruzzaman ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Arsenic Removal ◽  
Multiple Injection ◽  
Arsenic Adsorption ◽  
Rural Bangladesh ◽  
Hand Pump ◽  
Oxidized Iron ◽  
Intermittent Operation ◽  
Tube Well ◽  
Provide Drinking Water

Hand-pump subsurface arsenic removal (SAR) has been investigated in rural Bangladesh with different groundwater conditions and intermittent operation modes. Multiple injection-abstraction cycles were performed after injection of 1 m3 of aerated water. From these experiments it can be concluded that hand-pump SAR, in the traditional injection-abstraction design, does not provide drinking water below the WHO arsenic guideline of 10 μg/L. Results show that arsenic removal was not enhanced by: (i) injection of O2-rich water, (ii) higher Fe:As ratios in the groundwater, or by (iii) multiple injection-abstraction cycles, i.e. at location 1, the breakthrough occurred at abstraction-injection ratios of Va/Vi = 2, for cycle 23. It is proposed that dissolved organic carbon (DOC), bicarbonate and phosphate have a significant effect on the arsenic adsorption process. However, iron removal was very efficient and abstraction-injection ratios increased within successive cycles, with Va/Vi > 8 for cycle 23. Furthermore, intermittent operation reduced arsenic concentrations after stop and restart, suggesting insufficient contact time between soluble arsenic and oxidized iron surfaces around the tube well.

Million Dollar Arsenic Removal Plants in West Bengal, India: Useful or Not?

2006 ◽  
Vol 41 (2) ◽  
pp. 216-225 ◽  
Author(s):  
M. Amir Hossain ◽  
Amitava Mukharjee ◽  
Mrinal Kumar Sengupta ◽  
Sad Ahamed ◽  
Bhaskar Das ◽  
...  
Keyword(s):  
Watershed Management ◽  
Arsenic Removal ◽  
West Bengal ◽  
Arsenic Concentration ◽  
Poor Performance ◽  
Raw Water ◽  
User Friendliness ◽  
Treated Water ◽  
Guideline Value ◽  
Who Guideline

Abstract The effectiveness of arsenic removal plants (ARPs) to provide safe water was evaluated based on a study of 577 ARPs out of 1900 installed in 5 arsenic-affected districts of West Bengal, India. Out of 577, 145 (25.1%) were found in defunct condition. Both raw and filtered water from 305 ARPs were analyzed for total arsenic concentration. Forty-eight ARPs were installed despite raw water arsenic concentrations below the Indian standard (50 µg/L) and in 22 cases even below the WHO guideline value (10 µg/L). Among the 264 ARPs having raw water arsenic above 50 µg/L, 140 (53.1%) and 73 (27.7%) failed to remove arsenic below the WHO guideline value and Indian standard, respectively. The highest arsenic concentration in treated water was 705 µg/L. Analysis of 217 treated water samples for iron showed that 175 (80.6%) failed to remove iron below 300 µg/L. The treated water became coloured on standing 6 to 8 h, for 191 (44.2%) ARPs and 25 (5.8%) produced bad-odoured water. Overall, the study showed that 475 (82.3%) of the ARPs were not useful. The reasons for ineffectiveness and poor performance of these ARPs include improper maintenance, sand gushing problems, a lack of user-friendliness and absence of community participation. A comparative study of ARPs in two different blocks (Domkol in Murshidabad district and Swarupnagar in North 24 Parganas) showed that 39 (80%) and 38 (95%) ARPs, respectively, were not useful. Further study in Gram Panchayet Kolsur, Deganga block, North 24 Parganas, showed that 14 (87.5%) ARPs were not useful. Proper watershed management with active participation from the villagers is urgently required for successful mitigation.

Phosphonium grafted styrene–divinylbenzene resins impregnated with iron(III) and crown ethers for arsenic removal

2014 ◽  
Vol 86 (11) ◽  
pp. 1729-1740 ◽  
Author(s):  
Adina Negrea ◽  
Adriana Popa ◽  
Mihaela Ciopec ◽  
Lavinia Lupa ◽  
Petru Negrea ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Arsenic Removal ◽  
Arsenic Concentration ◽  
Underground Water ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Iron Ions ◽  
Arsenic Adsorption ◽  
Equilibrium Data ◽  
Styrene Divinylbenzene

Abstract In the present work a polymer with phosphonium pendant groups impregnated with crown ether (dibenzo-18-crown-6) and loaded with iron ions was investigated for arsenic removal through adsorption from aqueous solutions. The impregnated polymer was loaded with iron ions due to the high affinity of arsenic to it. The characterization of the surface modification of the obtained new adsorbent material was performed on the basis of energy dispersive X-ray analysis; scanning electron microscopy and Fourier transform infrared spectroscopy. The arsenic adsorption was investigated, including effect of pH, arsenic initial concentration, the shaking time and temperature. The effect of the pH was examined over the range 2–11. The adsorption of As(V) increases with pH increasing reaching a maximum at pH higher than 8. Equilibrium, kinetic and thermodynamic studies were carried out to study the adsorption performance of the obtained material in the removal process of arsenic from aqueous solutions. For the studied materials the equilibrium data closely fitted Langmuir model and was achieved a maximum adsorption capacity of 32.6 μg As(V)/g of material. The pseudo-second order kinetic model is suitable for describing the adsorption system. The obtained results show that the studied adsorbent can be used with efficiency in the arsenic removal from underground water even from low influent arsenic concentration solutions.

scholarly journals Effect of different fertilizer types on Arsenic removal capacity of two fern species

2014 ◽  
Vol 6 (1) ◽  
pp. 42-46
Author(s):  
Thi Kim Anh Bui
Keyword(s):  
Environmental Factors ◽  
Plant Growth ◽  
Arsenic Removal ◽  
Organic Fertilizer ◽  
Arsenic Concentration ◽  
Pteris Vittata ◽  
Removal Capacity ◽  
Fern Species ◽  
Pityrogramma Calomelanos ◽  
Hyperaccumulator Plant

More and more attention has been paid to the research on phytoremediation and hyperaccumulators. Arsenic (As) uptake by hyperaccumulator plant species depends on many different environmental factors. Fertilizer is one of the most important factors because the plant growth needs nutrients. In this study, the pot experiments were conducted in 12 weeks to understand the effect of different fertilizer on As removal capacity of Pityrogramma calomelanos and Pteris vittata. The results showed that, Arsenic concentration in the frond is higher than that in the root of the fern. As removal efficiency of the ferns from the soil amended with both inorganic and organic fertilizer is highest. The ferns removed As content in soil up to 7.4 and 12.6 mg As per kg DW soil, respectively. For the control experiments without adding fertilizers, As removal ability of the ferns from the soil is lowest that was only 2.1 mg As per kg DW soil. Trên thế giới đã và đang có nhiều nghiên cứu, ứng dụng phương pháp sử dụng thực vật để xử lý ô nhiễm, đặc biệt là các loài thực vật siêu tích tụ kim loại nặng. Sự tích lũy Asen (As) trong các loài thực vật siêu tích lũy phụ thuộc vào rất nhiều yếu tố môi trường và dinh dưỡng khác nhau. Phân bón là một trong những yếu tố quan trọng nhất vì sự phát triển cây rất cần chất dinh dưỡng. Trong nghiên cứu này, các thí nghiệm được tiến hành trong 12 tuần để đánh giá về ảnh hưởng của các loại phân bón khác nhau đến khả năng xử lý ô nhiễm As trong đất của dương xỉ. Kết quả thu được cho thấy, nồng độ As tích lũy trong phần thân của dương xỉ cao hơn rất nhiều so với phần rễ của cây. Hiệu quả loại bỏ As ra khỏi đất của dương xỉ trong các thí nghiệm bổ sung cả phân bón vô cơ và phân bón hữu cơ là cao nhất. Pityrogramma calomelanos và Pteris vittata có thể loại bỏ hàm lượng As trong 1 kg trọng lượng khô đất tương ứng lên đến 7,4 và 12,6 mg. Các công thức thí nghiệm đối chứng không bổ sung phân bón thì cho hiệu quả loại bỏ As ra khỏi đất là thấp nhất chỉ 2,1 mg As trên 1 kg trọng lượng khô đất.

Local innovation for application of membrane system for supply of arsenic-safe water in rural Bangladesh

2019 ◽  
pp. 35-42
Author(s):  
Tashfia Aktar ◽  
Hossain Barsha ◽  
Fardeen Arafat ◽  
Nadim Reza Khandaker ◽  
Barsha Hossain
Keyword(s):  
Arsenic Removal ◽  
Produced Water ◽  
Low Cost ◽  
Arsenic Concentration ◽  
Cost Effective ◽  
Membrane System ◽  
Hydraulic Pressure ◽  
Rural Bangladesh ◽  
The People ◽  
Removal Technologies

Over seventy million people in Bangladesh are drinking arsenic contaminated water. There is a lack of available sustainable arsenic removal technologies in the rural Bangladesh. This paper reports on a successful retrofit that allows for readily available, cost effective and dependable membrane system application for arsenic removal in rural Bangladesh. The retrofit is very simple, overcoming the limitation of a hydraulic pressure by a low cost pump placement in line to the membrane system. The system was field tested in a well with high arsenic concentration 0.1 mg/L (Government of Bangladesh Limit is 0.05 mg/L), along with high iron and hardness. In the field trial, the retrofitted technology was successful and produced water that does not contain any arsenic (0.0 mg/L), low in iron, and low in hardness. The system cost, along with the retrofitting, is only a hundred and seventy US dollars, a sum within the reach of many in Bangladesh. It is also important to note that we are using an existing technology available off the shelf and retrofitting it using locally available materials. The work reported in the paper will create a significant impact relief to the people in the arsenic affected regions of Bangladesh.

Evaluation of the Adsorption Potential of Synthesized Anatase Nanoparticles for Arsenic Removal

2011 ◽  
Vol 1317 ◽  
Author(s):  
Z. Özlem Kocabaş ◽  
Yuda Yürüm
Keyword(s):  
Arsenic Removal ◽  
Sol Gel ◽  
Arsenic Concentration ◽  
Equilibrium Concentration ◽  
Arsenic Species ◽  
Batch Adsorption ◽  
Adsorption Models ◽  
Removal Capacity ◽  
Anatase Nanoparticles ◽  
Langmuir And Freundlich Models

ABSTRACTTitanium dioxide has been extensively tested in environmental applications, especially in separation technologies. In the present study, anatase nanoparticles were synthesized by using a sol-gel method, and batch adsorption experiments were carried out to analyze arsenic removal capacity of the anatase nanoparticles from water. The maximum arsenic removal percentages were found ~ 84 % for As(III) at pH 8 and ~98% for As(V) at pH 3, respectively, when 5 g/l anatase nanoparticles were used at an initial arsenic concentration of 1 mg/l. The results of the sorption experiments, which take into consideration the effects of equilibrium concentration on adsorption capacity, were analyzed with two popular adsorption models, Langmuir and Freundlich models. From the comparison of R2 values, the adsorption isotherm for As(III) was fitted satisfactorily well to the Langmuir equation (R2 > 0.996) while the adsorption behavior of As(V) on anatase nanoparticles was described better with Freundlich equation (R2 > 0.991). This study proposes the potential adsorbent material for water which is contaminated with arsenic species.

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