Design, laboratory verification, and mathematical modeling of an anaerobic system for the treatment of low-strength wastewater.
Item
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Title
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Design, laboratory verification, and mathematical modeling of an anaerobic system for the treatment of low-strength wastewater.
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Identifier
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AAI9020770
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identifier
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9020770
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Creator
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Hussein, Hassan Emam.
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Contributor
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Adviser: John Fillos
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Date
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1990
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Civil | Engineering, Sanitary and Municipal | Environmental Sciences
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Abstract
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The goals of this research were (1) To develop a new modification of the anaerobic biofilter to treat low strength wastewater and experimentally investigate its effectiveness. The new modification has been designed to support both suspended and attached biological growth. (2) To develop a mathematical model that defines the dynamic behavior of the wastewater and the solids growth within the reactor. The model can be used to predict the process performance under different operating conditions. The model should also be helpful in the design of a full scale reactor. (3) To subject the model to a sensitivity analysis to identify the key parameters involved in the process, and to evaluate their impacts on the reactor as their values change.;The wastewater investigated has the short chain acetic fatty acid as its sole substrates. The acetic acid or acetate is probably the most important and rate limiting methane precursor. The wastewater also contained sufficient minerals and vitamins needed by the fermentative bacteria.;The developed mathematical model uses Monod kinetics, the coefficients of which were collected from literature, or estimated either by calibration or based on theoretical considerations. The reactor performance was investigated over a temperature range from 10 to 30{dollar}\sp\circ{dollar}C and an organic loading range of 0.65 to 0.95 Kg COD/m3/day, which are wide ranges for practical engineering applications. Two wastewater strengths (of 250 and 350 mg/L COD) were studied within the reactor temperature and organic loading ranges indicated above.;The experimental data suggest that the biofilter modification used is a successful application to the treatment of low strength soluble organic wastewater. The results showed that for temperatures above 20{dollar}\sp\circ{dollar}C and organic loading below 0.85 Kg COD/m3/day the filter meets the NPDES requirements.;The mathematical model was found to be representative of the process. Sensitivity analysis indicates that, substrate utilization rate K, organic loading, influent substrate concentration So, temperature T, half-velocity coefficient Ks all have significant influence on process performance.;The experimental data suggest that the biofilter modification investigated is a significant improvement to the anaerobic biofilter.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
