biological oxygen demand removal Articles

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Organics Monitoring: A Practical Guide

by GE Analytical Instruments  (Apr. 6, 2015)

Preventing product loss, lowering waste treatment costs, and reducing system maintenance and energy consumption through organics monitoring in the chemical, refining, food, and wastewater treatment industries. Summary Process water and steam condensate contamination includes organic, inorganic, and biological components. Sources of organic ...

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. ...

Nutrient removal in reverse osmosis concentrates using a biological aerated filter

by IWA Publishing  (Apr. 8, 2015)

The aim of this study is to employ a biological aerated filter (BAF) in the treatment of reverse osmosis (RO) concentrate received from reuse of treatment plant wastewater. Furthermore, the influence of chemical oxygen demand (COD)/N ratio on the nutrient removal was analyzed to find the detailed removal pathways of nutrients. The result was ...

Influence of COD/sulfate ratios on the integrated reactor system for simultaneous removal of carbon, sulfur and nitrogen

by IWA Publishing  (Mar. 16, 2015)

An integrated reactor system was developed for the simultaneous removal of carbon, sulfur and nitrogen from sulfate-laden wastewater and for elemental sulfur (S0) reclamation. The system mainly consisted of an expanded granular sludge bed (EGSB) for sulfate reduction and organic carbon removal (SR-CR), an EGSB for denitrifying sulfide removal ...

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 ...

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 ...

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 ...

Pilot-scale study of vertical flow constructed wetland combined with trickling filter and ferric chloride coagulation: influence of irregular operational conditions

by IWA Publishing  (Apr. 13, 2015)

The aim of this study was to characterize the efficiency of an intensified process of vertical flow constructed wetland having the following particularities: (i) biological pretreatment by trickling filter, (ii) FeCl3 injection for dissolved phosphorus removal and (iii) succession of different levels of redox conditions along the process line. A ...

Non-linear modeling using fuzzy principal component regression for Vidyaranyapuram sewage treatment plant, Mysore – India

by IWA Publishing  (Sep. 29, 2014)

Fuzzy principal component regression (FPCR) is proposed to model the non-linear process of sewage treatment plant (STP) data matrix. The dimension reduction of voluminous data was done by principal component analysis (PCA). The PCA score values were partitioned by fuzzy-c-means (FCM) clustering, and a Takagi–Sugeno–Kang (TSK) fuzzy ...

Performance comparison between two equal stabilization ponds operating with and without sludge layer

by IWA Publishing  (Mar. 27, 2015)

Stabilization ponds are a highly appropriate system for treating sewage in small to medium size communities. However, sludge accumulation at the pond bottom occurs with the passage of time, reducing the net pond volume, which, in principle, could affect its performance. The objective of this paper is to compare the behaviour of two equal ponds ...

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