Document Detail

Removal of microcystins by slow sand filtration.
MedLine Citation:
PMID:  12203961     Owner:  NLM     Status:  MEDLINE    
To assess the elimination potential of slow sand filters for cyanobacterial hepatotoxins (microcystins), two full-scale experiments were conducted using the German Federal Environment Agency's experimental field in Berlin, Germany. One experiment was carried out with dissolved microcystins extracted from a cyanobacterial bloom on one of Berlin's lakes, dosed as short-term, single-pulse application. The other experiment simulated natural conditions more closely, with a longer-term exposure of the filter to living cyanobacterial cells (collected from the same lake) so that most toxins were initially contained inside the cells. The microcystins were detected by ELISA and HPLC/photodiode array detector and subsequently identified by MALDI-TOF MS. The experiment with dissolved microcystins yielded very high elimination rates (>95%) inside the filter bed attributed to biodegradation, whereas retardation by adsorption was low. The obtained half-lives for the microcystins detected by ELISA were about 1 h. The second experiment, which was with mostly cell-bound microcystins, showed similar results during the first days after application of cyanobacteria (elimination >85%). As the population declined in late autumn, the proportion of extracellular to cell-bound microcystins increased. At the same time the elimination rates declined to values <60%. This decline is most likely attributable to retarded biodegradation at temperatures of <4 degrees C. Altogether the results of the experiments show that under moderate temperatures, with an intact schmutzdecke (biofilm) with previous contact with microcystins, slow sand filtration is an effective treatment for eliminating microcystins from drinking water.
Gesche Grützmacher; Gabriele Böttcher; Ingrid Chorus; Hartmut Bartel
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental toxicology     Volume:  17     ISSN:  1520-4081     ISO Abbreviation:  Environ. Toxicol.     Publication Date:  2002  
Date Detail:
Created Date:  2002-08-30     Completed Date:  2002-10-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100885357     Medline TA:  Environ Toxicol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  386-94     Citation Subset:  IM    
Copyright Information:
Copyright 2002 Wiley Periodicals, Inc.
German Federal Environmental Agency (Umweltbundesamt, UBA), P.O. Box 330022, D-14191 Berlin, Germany.
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MeSH Terms
Chromatography, High Pressure Liquid
Enzyme-Linked Immunosorbent Assay
Peptides, Cyclic / analysis*,  chemistry
Silicon Dioxide
Water Purification / methods*
Water Supply*
Reg. No./Substance:
0/Microcystins; 0/Peptides, Cyclic; 7631-86-9/Silicon Dioxide; 77238-39-2/microcystin

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

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