Removal of heavy metals from sewage by sulphide precipitation: Thermodynamic calculations and tests on a pilot‐scale anaerobic reactor

1992 ◽  
Vol 13 (3) ◽  
pp. 281-291 ◽  
Author(s):  
S.J. Cowling ◽  
M.J. Gardner ◽  
D.T.E. Hunt
Keyword(s):  
Heavy Metals ◽  
Pilot Scale ◽  
Thermodynamic Calculations ◽  
Anaerobic Reactor ◽  
Removal Of Heavy Metals ◽  
Sulphide Precipitation

Heavy Metal Removal Using Bound Macrocycles

1991 ◽  
Vol 23 (1-3) ◽  
pp. 301-308 ◽  
Author(s):  
R. M. Izatt ◽  
R. L. Bruening ◽  
M. B. Borup
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Removal ◽  
Equilibrium Constants ◽  
Heavy Metal Removal ◽  
Pilot Scale ◽  
Heavy Metal Cations ◽  
Gel Beads ◽  
Removal Of Heavy Metals ◽  
Alkaline Earth Cations

Aza macrocycles bound to silica gel beads were found to selectively remove heavy metal cations such as Pb2+, Cd2+, Ag+, and Hg2+ from aqueous solutions. These bound macrocycles have a virtually infinite selectivity of binding with heavy metals over alkali and alkaline earth cations. The material is very stable and can be reused hundreds of times. Columns may be regenerated using an acidic eluent solution. Equilibrium constants were determined by column tests. Removal of heavy metals was demonstrated in bench scale tests using a synthetic contaminated water and in pilot scale tests using a naturally contaminated river water. Heavy metal concentrations could be effectively reduced to the µg/L level using the process.

scholarly journals The Removal of Heavy Metals from the Leachate of Aged Landfill: The Application of the Fenton Process and Nanosilica Absorbent

2021 ◽  
Vol 19 (6) ◽  
pp. 1-8
Author(s):  
Kamran Taghavi ◽  
◽  
Dariush Naghipour ◽  
Seyed Davoud Ashrafi ◽  
Malihe Salehi ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Retention Time ◽  
Fenton Process ◽  
Leachate Treatment ◽  
Removal Rates ◽  
Anaerobic Process ◽  
Anaerobic Reactor ◽  
Anaerobic Reactors ◽  
Removal Of Heavy Metals ◽  
And Control

Since leachate is typically composed of numerous constituents, its management requires special attention. After the raw leachate of Saravan in Rasht (Guilan Province, Iran) was transferred to a laboratory and its specifications were determined, it was subjected to experiments by the bench-scale method. The analyses of pH and heavy metals were performed in the main and control anaerobic reactors at time zero, before precipitation, and two hours after precipitation. After the anaerobic process was over and the optimal retention time was identified in the anaerobic reactor, the removal of heavy metals was analyzed by the Fenton process and nanosilica absorbent in leachate treatment. In the primary anaerobic reactor, the highest and lowest removal rates were 59 and 39% for Ni and Cu, respectively. In the Fenton process with optimal H2O2/Fe+2 ratio, Cu and Hg showed the lowest and highest removal rates of 22.4 and 54.54%, respectively. At the optimal rate of nanosilica absorbent and the retention time of 15 min, As was removed maximally with an efficiency of 38% and Cu was removed minimally. The results revealed that the integration of the anaerobic process with the Fenton process and nanosilica absorbent was very effective in removing heavy metals from the aged landfill leachate.

Pilot scale study on the ex situ electrokinetic removal of heavy metals from municipal wastewater sludges

2002 ◽  
Vol 36 (19) ◽  
pp. 4765-4774 ◽  
Author(s):  
Soon-Oh Kim ◽  
Seung-Hyeon Moon ◽  
Kyoung-Woong Kim ◽  
Seong-Taek Yun
Keyword(s):  
Heavy Metals ◽  
Municipal Wastewater ◽  
Pilot Scale ◽  
Ex Situ ◽  
Removal Of Heavy Metals ◽  
Wastewater Sludges

Biosorption: An Eco-Friendly Technique for the Removal of Heavy Metals

2011 ◽  
Vol 2 (3) ◽  
pp. 1-8 ◽  
Author(s):  
Sasmita Sabat ◽  
◽  
R V Kavitha R V Kavitha ◽  
Shantha S L Shantha S L ◽  
Gopika Nair ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Removal Of Heavy Metals
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