biological oxygen demand removal Articles

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Managing Ponds for BOD Reduction and Odor Control

by Integrated Engineers Inc.  (May 8, 2007)

A large number of food processors utilize ponds to treat their wastewater. Most of the time these ponds are aerobic in which they use oxygen to degrade the wastewater biological oxygen demand (BOD). Fruit and vegetables contain a high amount of simple sugars and other organic compounds that when exposed to water are released into the water stream. ...

Emphasis Shifting to Toxicity Reduction

by Calgon Carbon Corporation  (Jun. 1, 1993)

Untitled Document Under the Clean Water Act (CWA), the U.S. Environmental Protection Agency (EPA) established the National Pollutant ...

Toxicity reduction and biodegradability enhancement of cork processing wastewaters by ozonation

by IWA Publishing  (Nov. 29, 2013)

Biodegradability enhancement and detoxification of cork boiling wastewater (CBW) are required for the successful implementation of biological treatment options. We studied the possibility of achieving these goals through ozonation pre-treatment by experimenting on the effect of ozone dose and pH. The CBW used had a pH of 5.81, a chemical oxygen ...

Performance and metabolic aspects of a novel enhanced biological phosphorus removal system with intermittent feeding and alternate aeration

by IWA Publishing  (Apr. 24, 2014)

A novel enhanced biological phosphorus removal (EBPR) system, which combined the intermittent feeding design with an anaerobic selector, was examined using on-line oxidation reduction potential (ORP), nitrate and ammonium probes. Two experimental periods were investigated: the aerobic and anoxic phases were set at 40 and 20 minutes respectively ...

Monitoring and control of a partially packed biological aerated filter (BAF) reactor for improving nitrogen removal efficiency

by IWA Publishing  (Sep. 1, 2011)

This paper examines on-off systems and automatic monitoring and control of a biological aerated filter to identify the end point of nitrification and denitrification processes, and chemical oxygen demand (COD), ammonia-nitrogen removal (NH3-N) and aeration savings. Oxidation-reduction potential (ORP), pH and dissolved oxygen (DO) were measured ...

Acetic acid recovery from a hybrid biological–hydrothermal treatment process of sewage sludge – a pilot plant study

by IWA Publishing  (Mar. 16, 2015)

A two-stage process consisting of anaerobic fermentation followed by sub-critical wet oxidation was used to generate acetic acid from sewage sludge at pilot scale. Volatile fatty acids, dominated by propionic acid, were produced over 4–6 days in the 2,000 L fermentation reactor, which also achieved 31% solids reduction. ...

The impact of slowly biodegradable organic compounds on the oxygen uptake rate in activated sludge systems

by IWA Publishing  (Mar. 19, 2014)

The hydrolysis process of slowly biodegradable substrate (XS) has an impact on the efficiencies of nutrient removal in activated sludge systems. Measurement of oxygen utilization rates (OURs) and corresponding chemical oxygen demand (COD) is accepted as a very useful tool to reflect the consumption of biodegradable substrates. The influence of ...

Reductions in greenhouse gas (GHG) generation and energy consumption in wastewater treatment plants

by IWA Publishing  (Feb. 18, 2013)

Greenhouse gas (GHG) emission and energy consumption by on-site and off-site sources were estimated in two different wastewater treatment plants that used physical–chemical or biological processes for the removal of contaminants, and an anaerobic digester for sludge treatment. Physical–chemical treatment processes were used in the ...

A new oxic-settling-anaerobic (NOSA®) activated sludge process for minimizing excess sludge in secondary biological treatment plants: a pilot-scale evaluation of the absorption–biodegradation process

by IWA Publishing  (Aug. 8, 2013)

This study compared the sludge reduction performance of a new oxic-settling-anaerobic (NOSA) process with that of a conventional adsorption–biodegradation process. A 50 m3/d pilot trial system with two different process configurations was operated for 6 months. The NOSA process functioned effectively in removing both chemical oxygen ...

Waste activated sludge reduction using sonication and cryptic growth

by Inderscience Publishers  (Apr. 28, 2008)

The management of excess activated sludge imposes great cost on wastewater treatment plants and represents significant technical challenges. This paper investigates a new technology, sonication and cryptic growth, to reduce the amount of excess sludge from the wastewater treatment system. Subsequent Biological Reactors (SBRs) were used for the ...

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