WERF Report U1R07
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Ebook only
Available as an ebook
Please purchase via www.iwaponline.comOpens in new window
Also part of Water Intelligence Online Digital Reference Library
Standard ePrice: £28.00
+ VAT
Biogenic iron oxides produced by circumneutral iron-oxidizing bacteria were evaluated for phosphate removal. Traditional batch equilibrium experiments were coupled with bench-scale flow through filters to accomplish this task. Results from batch equilibrium experiments show that biogenic iron oxides can bind between 6.5 and 25.4 mg P/g solids, values that met or exceeded the sorption capacity of other iron rich substrates. Desorption of phosphate ranged from 10 to 40% for saline and potassium chloride solutions. When basic conditions were used to remove bound phosphate, 100 to 250% of applied phosphate was recovered, due to phosphate previously bound to iron oxides and that which was released from intact microbial cells. Flow through filter experiments with biogenic iron oxides highlighted technology potential and limitations. Several filter runs achieved effluent concentrations less than 0.2 mg P/L for more than 4 days, but most trials yielded moderate removal (70%). Paradoxically, the biologic origin of the iron oxides proved to be inhibitory during filtration, while this aspect of the technology would likely be the reason it could be an attractive alternative (matrix potentially re-grown in-place). Detergents and physical separation by a sand support both effectively improved filter performance by dispersing interconnected biogenic iron oxides. Collectively, results suggest biogenic iron oxides could be a reasonable phosphate filter material if a better understanding of growth conditions and requirements is obtained.
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The researchers have developed a methodological framework that aims to provide a predictive approach to water quality criteria selection.
The basic constituents of the proposed methodology...
This research study explores the relationship of urbanization to ecology in the wadeable streams of developing watersheds and describes a protocol, which urban...
The challenges of addressing the needs of aging water and wastewater infrastructure require new management approaches. Traditional municipal water management practices may not be the most cost...
Granular-media filtered secondary effluent from a full-scale plant was subsequently treated at pilot-plant scale by combinations of low- and high pressure membranes. The feedwater was split...
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This report describes a linked environmental dispersion, exposure, and health effects model, known as the Spreadsheet Microbial Assessment of Risk:...
Performance assessment has been one of the hottest topics in the water industry in the past decade. In that period, the International Water Association has played a key role, and the performance...
The development of this WERF anaerobic digester (AD) foaming guidance document is based on the need for a specific detailed methodology that water reclamation and recovery facilities (WRRF)...
Wastewater treatment plants are large non-linear systems subject to large perturbations in wastewater flow rate, load and composition. Nevertheless these plants have to be operated continuously,...