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Author Malecki-Brown, Lynette M. ♦ White, John R. ♦ Sees, M.
Source World Health Organization (WHO)-Global Index Medicus
Content type Text
Publisher American Society of Agronomy
File Format HTM / HTML
Language English
Difficulty Level Medium
Subject Domain (in DDC) Social sciences ♦ Social problems & services; associations ♦ Social welfare problems & services ♦ Natural sciences & mathematics ♦ Chemistry & allied sciences ♦ Life sciences; biology ♦ Physiology & related subjects ♦ Biochemistry ♦ Natural history of organisms ♦ Technology ♦ Medicine & health ♦ Human physiology ♦ Personal health & safety ♦ Pharmacology and therapeutics ♦ Diseases ♦ Agriculture & related technologies ♦ Techniques, equipment & materials
Subject Domain (in MeSH) Eukaryota ♦ Organisms ♦ Inorganic Chemicals ♦ Complex Mixtures ♦ Chemicals and Drugs ♦ Physical Phenomena ♦ Chemical Phenomena ♦ Biological Phenomena ♦ Biological Sciences ♦ Environment and Public Health ♦ Health Care
Subject Keyword Discipline Environmental Health ♦ Alum Compounds ♦ Chemistry ♦ Carbon ♦ Isolation & Purification ♦ Nitrogen ♦ Phosphorus ♦ Water Purification ♦ Methods ♦ Alismatidae ♦ Electric Conductivity ♦ Hydrogen-ion Concentration ♦ Oxygen ♦ Analysis ♦ Seasons ♦ Sewage ♦ Time Factors ♦ Typhaceae ♦ Water ♦ Wetlands ♦ Journal Article
Abstract Nutrient removal in treatment wetlands declines during winter months due to temperature. A 3-mo (wintertime) mesocosm study was conducted to determine the effectiveness of alum in immobilizing P as well as other nutrients during this period of reduced treatment efficiency. Eighteen mesocosms, triplicate alum, and three controls or no alum were established with either Typha spp., Schoenoplectus californicus, or SAV (Najas guadalupensis-dominated). Alum was delivered by timer at a rate of 0.81 g Al m(-2) d(-1) and parameters measured included: pH, soluble reactive phosphorus (SRP), total phosphorus (TP), dissolved organic carbon (DOC), dissolved inorganic nitrogen (DIN), total kjeldahl nitrogen (TKN), and soluble aluminum (Al). Alum-treated mesocosms had significantly lower pH values (8.1) than controls (8.8), but well within the elevated pH range for aluminum toxicity. Alum significantly reduced all measured water column nutrients with the exception of ammonium N, which remained unaffected, and particulate P, which increased. This study demonstrated that seasonal low-dosage alum application to different vegetation communities in a treatment wetland can significantly improve treatment efficiencies for SRP (87 vs. 58%) and TP (62 vs. 44%) but also increase DOC (19 vs. 0%) and TKN (12 vs. -3%) removal capacity to a lesser degree. Alum applications within close proximity of the treatment wetland effluent points should be implemented with caution due to the production of alum floc-bound P which could potentially affect discharge permit compliance for total suspended solids or total P.
Description Country affiliation: United States
Author Affiliation: Malecki-Brown LM ( Soil and Water Science, Univ. of Florida, Gainesville, FL 32611, USA.)
ISSN 00472425
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Reading ♦ Research ♦ Self Learning
Interactivity Type Expositive
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2009-03-01
Publisher Place United States
e-ISSN 15372537
Journal Journal of Environment Quality
Volume Number 38
Issue Number 2

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Source: WHO-Global Index Medicus