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

scholarly journals Pilot-Scale Removal of Arsenic and Heavy Metals from Mining Wastewater Using Adsorption Combined with Constructed Wetland

Minerals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 379 ◽  
Author(s):  
Ha Nguyen ◽  
Bien Nguyen ◽  
Thuy Duong ◽  
Anh Bui ◽  
Hang Nguyen ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Constructed Wetland ◽  
Pilot Scale ◽  
Common Reed ◽  
X Ray Diffraction ◽  
Combined System ◽  
Constant Flow Rate ◽  
Mining Wastewater ◽  
Scale Experiment ◽  
Removal Of Arsenic

This study was conducted to assess the removal of arsenic (As) and heavy metals from mining wastewater by the combination of adsorption, using modified iron-ore drainage sludge, and horizontal-subsurface-flow constructed wetland with common reed (Phragmites australis). The pilot-scale experiment with a constant flow rate of 5 m3/day was operated for four months using real wastewater from a Pb–Zn mine in northern Vietnam. Atomic absorption spectroscopy was used for elemental analysis in wastewater and plant. X-ray diffraction (XRD), surface charge measurements (by a particle charge detector (PCD)), Fourier-transform infrared (FTIR), and surface area Brunauer–Emmet–Teller (BET) measurements were performed to determine the characteristics of the adsorbent. The results showed that the average removals of As, Mn, Cd, Zn, and Pb by the combined system with limestone substrate during four months were 80.3%, 96.9%, 79.6%, 52.9%, and 38.7%, respectively. The use of another constructed wetland substrate, laterite, demonstrated better removal efficiency of As than limestone. The concentrations of As and heavy metals in the effluent were lower than the limits established by the QCVN 40:2011/BTNMT for industrial wastewater, which indicated the feasibility of combining adsorption and constructed wetland for the treatment of mining wastewater.

Characterization of iron and steelmaking wet dust for arsenic remove in wastewaters

2012 ◽  
Vol 1380 ◽  
Author(s):  
V. Narvaez-García ◽  
A. Martínez-Luevanos ◽  
F. Carrillo-Pedroza ◽  
M. Soria-Aguilar ◽  
M. Guajardo-Castillo ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Water Treatment ◽  
Specific Area ◽  
Process Efficiency ◽  
Environmental Applications ◽  
Total Arsenic ◽  
Initial Concentration ◽  
Removal Of Heavy Metals ◽  
Removal Of Arsenic

ABSTRACTDust originated from the iron and steelmaking containing undesirable compounds are not completely recycled because affects the process efficiency. These types of dust represents an economical lost as a consequence of values contents. However, dust have been characterized physically and chemically in order to study their potential environmental applications, as the removal of arsenic in wastewater. The results shows that dust have a superficial specific area between 16 and 20 m2/g, values considered high, typical of a material with adsorbent properties. Representative results of different tests adsorption of arsenic in the material described indicate that it is possible to reduce the arsenic levels in up to 95% from an initial concentration of 1 mg/L of total arsenic. The results indicate that the iron and steelmaking wet dust may represent a new option as material for the removal of heavy metals in water treatment.

Assessment of a wastewater stabilization pond system for removal of arsenic, iron, and ammonia from reverse osmosis water treatment plant residual wastewater

2021 ◽  
Author(s):  
Harrison Bull ◽  
Ali Ekhlasi Nia ◽  
Mohsen Asadi ◽  
Kerry McPhedran
Keyword(s):  
Heavy Metals ◽  
Drinking Water ◽  
Water Treatment ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Water Treatment Plant ◽  
Depth Data ◽  
Water Treatment Plants ◽  
Removal Of Arsenic ◽  
Wastewater Stabilization Ponds

Drinking water treatment plants (DWTPs) produce wastewaters with elevated concentrations of heavy metals, metalloids, ammonia, and other contaminants. These wastewaters require treatment via processes including wastewater stabilization ponds (WSPs). This study assessed the arsenic (As), iron (Fe), and ammonia (NH3) concentrations in a Saskatchewan DWTP WSP system of five sequential ponds. Drone imaging combined with flow and depth data was used to estimate retention times which increased from 7-9 to 8-10 days after the DWTP upgrade. Concentration trends showed Fe decreased from Pond 1 to 3 and increased in Ponds 3 and 5, while As decreased from Pond 1 to 5. Average effluent As concentrations of 10.6 µg/L were over the 5.0 µg/L guideline, while both Fe and NH3 concentrations guidelines were easily met post-upgrade in 2020. Several actions are recommended to ensure adequate WSP operation including dredging, aeration, and installing macrophytes capable of As uptake.

Synthesis and characterization of radiation grafted films for removal of arsenic and some heavy metals from contaminated water

2012 ◽  
Vol 81 (10) ◽  
pp. 1606-1611 ◽  
Author(s):  
M.N.K. Chowdhury ◽  
M.W. Khan ◽  
M.F. Mina ◽  
M.D.H. Beg ◽  
Maksudur R. Khan ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Synthesis And Characterization ◽  
Contaminated Water ◽  
Removal Of Arsenic

scholarly journals Development of Phytoremediation Technology For Arsenic Removal-A State of Art

2021 ◽  
pp. 112-132
Author(s):  
Dr. Nitin W. Ingole ◽  
Vaibhav R. Dhawale
Keyword(s):  
Heavy Metals ◽  
Arsenic Removal ◽  
Polluted Soil ◽  
Wild Plants ◽  
Contaminated Water ◽  
Toxic Heavy Metals ◽  
Practical Applications ◽  
Physical Chemical ◽  
Soil Phytoremediation ◽  
Removal Of Arsenic

Toxic heavy metals and metalloids, like lead, mercury, arsenic, and selenium, are perpetually free into the surroundings atmosphere. There is a vital need to develop low-priced, effective, and supportable technique for removal or detoxification. Plant primarily based approaches, like phytore mediation, are unit comparatively cheap since they are performed in place and are solar-driven. Now this review, Specific advances in plant-based approaches for the remediation of contaminated water and soil. Phytoremediation is an alternate technology to remove of heavy metals in polluted soil. Wild plants were chosen for arsenic removal experiment. Removal of arsenic by conventional method is very costly; this paper focuses the review on method of phyto remediation to remove arsenic from soil. This method is being aesthetically pleasing and is on average tenfold cheaper than other physical, chemical or thermal remediation methods. This paper attempted to provide a brief review on recent progresses in research and practical applications of phytoremediation for soil and water resources.

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