Document Detail


Comparison of maturation ponds and constructed wetlands as the final stage of an advanced pond system.
MedLine Citation:
PMID:  16114699     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The treatment performance of a maturation pond (MP), the typical final polishing stage of an Advanced Pond System (APS), is compared with that of a surface-flow constructed wetland (CW) over 19 months. Both received approximately 67 mm d-1 of wastewater after passage through upstream stages of the APS. The MP, with greater sunlight exposure, had higher algal biomass (and associated suspended solids) than the CW, showed higher dissolved oxygen (DO) concentrations and greater diurnal variation in DO and pH. Neither polishing stages reduced nutrients markedly, with the CW exporting slightly more NH(3)-N and DRP, and less NO(3)-N than the MP. Disinfection was more efficient in the MP (geometric mean 1 log load removal, 12 MPN (100ml)-1) compared to the CW (0.47 log load removal, 53 MPN (100ml)-1). Incorporation of a final rock filter (28% of area) reduced median solids levels to < 10 g m(-3) in both the MP and CW. A hybrid between MPs and CWs with alternating zones of open-water (for enhanced disinfection and zooplankton grazing of algal solids) and wetland vegetation (promoting sedimentation and denitrification, and providing refugia for zooplankton) may provide more consistent effluent quality that either stage alone.
Authors:
C C Tanner; R J Craggs; J P S Sukias; J B K Park
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Water science and technology : a journal of the International Association on Water Pollution Research     Volume:  51     ISSN:  0273-1223     ISO Abbreviation:  Water Sci. Technol.     Publication Date:  2005  
Date Detail:
Created Date:  2005-08-23     Completed Date:  2005-12-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9879497     Medline TA:  Water Sci Technol     Country:  England    
Other Details:
Languages:  eng     Pagination:  307-14     Citation Subset:  IM    
Affiliation:
National Institute of Water and Atmospheric Research, PO Box 11-115, Hamilton, New Zealand. c.tanner@niwa.co.nz
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MeSH Terms
Descriptor/Qualifier:
Algae / drug effects*,  growth & development,  metabolism
Ammonia / metabolism
Animals
Biodegradation, Environmental
Biomass*
Disinfection*
Filtration
Hydrogen-Ion Concentration
Nitrates / chemistry,  metabolism
Nitrites / chemistry,  metabolism
Oxygen / chemistry,  metabolism
Plants / metabolism
Sunlight
Time Factors
Waste Disposal, Fluid / methods*
Water Purification / methods*
Zooplankton / growth & development
Chemical
Reg. No./Substance:
0/Nitrates; 0/Nitrites; 7664-41-7/Ammonia; 7782-44-7/Oxygen

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


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