Document Detail


Lignor process for acidic rock drainage treatment.
MedLine Citation:
PMID:  15515269     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The process using lignosulfonates for acidic rock drainage (ARD) treatment is referred to as the Lignor process. Lignosulfonates are waste by-products produced in the sulfite pulping process. The present study has shown lignosulfonates are able to protect lime from developing an external surface coating, and hence to favor its dissociation. Further, the addition of lignosulfonates to ARD solutions increased the dotting and settling rate of the formed sludge. The capability of lignosulfonates to form stable metal-lignin complexes makes them very useful in retaining metal ions and thus improving the long-term stability of the sludge against leaching. The Lignor process involves metal sorption with lignosulfonates, ARD neutralization by lime to about pH 7, pH adjustment with caustic soda to 9.4 - 9.6, air oxidation to lower the pH to a desired level, and addition of a minimum amount of FeCl3 for further removal of dissolved metals. The Lignor process removes all concerned metals (especially Al and Mn) from the ARD of the Britannia Mine (located at Britannia Beach, British Columbia, Canada) to a level lower than the limits of the B.C. Regulations. Compared with the high-density sludge (HDS) process, the Lignor process has many advantages, such as considerable savings in lime consumption, greatly reduced sludge volume, and improved sludge stability.
Authors:
J M Zhuang; T Walsh
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental technology     Volume:  25     ISSN:  0959-3330     ISO Abbreviation:  Environ Technol     Publication Date:  2004 Sep 
Date Detail:
Created Date:  2004-11-01     Completed Date:  2005-02-02     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9884939     Medline TA:  Environ Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1031-40     Citation Subset:  IM    
Affiliation:
NORAM Engineering and Constructors Ltd., 200 Granville Street, Vancouver, B.C., V6C 1S4, Canada.
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MeSH Terms
Descriptor/Qualifier:
Adsorption
Aluminum / chemistry
Calcium / chemistry
Calcium Compounds / chemistry
Canada
Geological Phenomena
Geology
Hydrogen-Ion Concentration
Lignin / analogs & derivatives*,  chemistry*
Magnesium / chemistry
Metals, Heavy / chemistry*
Mining*
Oxides / chemistry
Sewage / chemistry
Waste Disposal, Fluid / methods
Water Movements
Water Pollutants, Chemical*
Chemical
Reg. No./Substance:
0/Calcium Compounds; 0/Metals, Heavy; 0/Oxides; 0/Sewage; 0/Water Pollutants, Chemical; 1305-78-8/lime; 7429-90-5/Aluminum; 7439-95-4/Magnesium; 7440-70-2/Calcium; 8062-15-5/lignosulfuric acid; 9005-53-2/Lignin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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