Investigating nitrogen removal using simultaneous nitrification-denitrification in transferring wastewater through collection networks with small-diameter pipes

This study evaluates the removal of nitrogen compounds from wastewater in modified, small diameter gravity slope (SDGS) pipes during its conveyance. A 13-meter long, closed loop, wastewater collection network was designed and built at laboratory scale. The modified SDGS consists of Polyvinyl Chlorid...

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Bibliographic Details
Published in:Water practice and technology 2017-06, Vol.12 (2), p.396-405
Main Authors: Babanezhad, E., Amini Rad, H., Hosseini Karimi, S. S., Qaderi, F.
Format: Article
Language:English
Subjects:
Aerobic conditions
Ammonia
Attachment
Biofilms
Chemical oxygen demand
Circulation
Collection
Conveying
Denitrification
Design
Drinking water
Gravitation
Gravity
Gravity flow
Linear programming
Methods
Microorganisms
Municipal wastewater
Netting (materials/structures)
Nitrates
Nitrification
Nitrogen
Nitrogen compounds
Nitrogen removal
Oxic conditions
Oxidation
Oxygen demand
Pipes
Plastics
Polyvinyl chloride
Public health
Removal
Studies
Sustainable Development Goals
Temperature effects
Tubes
Wastewater
Wastewater collection
Wastewater treatment
Water pollution
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Summary:This study evaluates the removal of nitrogen compounds from wastewater in modified, small diameter gravity slope (SDGS) pipes during its conveyance. A 13-meter long, closed loop, wastewater collection network was designed and built at laboratory scale. The modified SDGS consists of Polyvinyl Chloride (PVC) tubes with perforated plastic netting fixed to the inner surfaces, to enhance biofilm attachment and growth under gravity flow. The system was operated at constant temperature using synthetic wastewater similar to municipal wastewater. The efficiency of ammoniacal nitrogen (NH3-N) removal at initial chemical oxygen demand (COD) concentrations of 340, 570, and 860 mg/L was studied. The NH3-N batch concentrations tested were 4.58, 6.32, and 9.48 mg/L, respectively. The results showed that nitrogen loss under aerobic conditions may have been due to simultaneous nitrification and denitrification, which began to operate when the biofilm was between 2.5 and 5.5 mm thick. A maximum NH3-N removal efficiency of 75% was achieved following 10 hours' circulation period, at a COD concentration of 570 mg/L.
ISSN:1751-231X
1751-231X
DOI:10.2166/wpt.2017.044