Entity

Time filter

Source Type

Fredericton, Canada

Allison M.,University of New Brunswick | Singh K.,University of New Brunswick | Bhattacharyya D.,National Institute of Technology Calicut | Webb J.,University of New Brunswick | Grant S.,ADI Systems Inc.
Proceedings, Annual Conference - Canadian Society for Civil Engineering | Year: 2011

The production of acrylic acid results in a toxic wastewater containing acrylic acid, formaldehyde, acetic acid and maleic acid. Acrylic acid wastewater is a product of the petrochemical industry. Treating this wastewater can be challenging. Under aerated conditions the volatile compounds are released into the atmosphere, therefore the wastewater is currently incinerated. This study aims to treat this toxic wastewater using an innovative anaerobic membrane bioreactor. The study shows the wastewater is treatable at organic loading rates up to 5 kg·COD/m 3·d. This is a high strength wastewater with an average influent COD of 85 g/L. The effluent COD was found to be below 600 mg/L. The results obtained demonstrate that 99% of COD was removed. The effluent contained no detectable acrylic acid, and formaldehyde was found typically below 1.5 mg/L. Trans-membrane pressure (TMP) is an important operating parameter when using submerged membrane bioreactors. TMP indicates fouling of the membrane, resulting in reduced flux. During four months of continuous operation at a flux of 0.2 m 3/m 2·d the TMP was found to be below 2 kPa. This indicates that the membrane bioreactor is capable of treating this wastewater at loadings studied without significant membrane fouling. The research is continuing and higher organic loading rates (7 and 8.5 kg·COD/m 3·d) are being studied. These results have concluded that the anaerobic membrane bioreactor (AnMBR) can treat wastewater from the production of acrylic acid up to a loading of 5 kg·COD/m 3·d, with COD removal of 99%. Source


Scott D.B.,University of Waterloo | Scott D.B.,ADI Systems Inc. | Van Dyke M.I.,University of Waterloo | Anderson W.B.,University of Waterloo | Huck P.M.,University of Waterloo
Canadian Journal of Microbiology | Year: 2015

The potential for regrowth of nitrifying microorganisms was monitored in 2 full-scale chloraminated drinking water distribution systems in Ontario, Canada, over a 9-month period. Quantitative PCR was used to measure amoA genes from ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA), and these values were compared with water quality parameters that can influence nitrifier survival and growth, including total chlorine, ammonia, temperature, pH, and organic carbon. Although there were no severe nitrification episodes, AOB and AOA were frequently detected at low concentrations in samples collected from both distribution systems. A culture-based presence–absence test confirmed the presence of viable nitrifiers. AOB were usually present in similar or greater numbers than AOA in both systems. As well, AOB showed higher regrowth potential compared with AOA in both systems. Statistically significant correlations were measured between several water quality parameters of relevance to nitrification. Total chlorine was negatively correlated with both nitrifiers and heterotrophic plate count (HPC) bacteria, and ammonia levels were positively correlated with nitrifiers. Of particular importance was the strong correlation between HPC and AOB, which reinforced the usefulness of HPC as an operational parameter to measure general microbiological conditions in distribution systems. © 2015, Canadian Journal of Microbiology. All rights reserved. Source


Trademark
Adi Systems Inc. | Date: 1997-03-27

mens and womens shoulder strap bags, backpacks, luggages, handbags and shopping bags made of leather or imitation leather; briefcases, pouches, suitcases, small cases for cosmetics, wallets, purses, umbrellas and all other leather, imitation leather and non-leather goods. footwear for men and women, clothing, namely, dresses, coats, trousers, blouses, shirts, T-shirts, jackets, skirts, pants, tops, foulards, scarves, hats, gloves, belts, pullovers, vest, neckerchiefs, ties, shorts, socks, stockings, shawls, sweaters, rain coats, overcoats, aprons, evening dresses, fur coats, parkas, waistcoats, boots, tights, swimming suits and bikinis.


Trademark
Adi Systems Inc. | Date: 1997-04-21

mens and womens shoulder strap bags, backpacks, luggages, handbags and shopping bags made of leather or imitation leather; briefcases, pouches, suitcases, small cases for cosmetics, wallets, purses, umbrellas and all other leather, imitation leather and non-leather goods. footwear for men and women, clothing, namely, dresses, coats, trousers, blouses, shirts, T-shirts, jackets, skirts, pants, tops, foulards, scarves, hats, gloves, belts, pullovers, vest, sweaters, rain coats, overcoats, aprons, evening dresses, fur coats, parkas, waistcoats, boots, tights, swimming suits and bikinis.


Trademark
Adi Systems Inc. | Date: 1997-04-21

mens and womens shoulder strap bags, backpacks, luggages, handbags and shopping bags made of leather or imitation leather; briefcases, pouches, suitcases, small cases for cosmetics, wallets, purses, umbrellas and all other leather, imitation leather and non-leather goods. footwear for men and women, shirts, T-shirts, jackets, skirts, pants, tops, foulards, scarves, hats, gloves, belts, pullovers, vest, neckerchiefs, ties, shorts, socks, stockings, shawls, sweaters, rain coats, overcoats, aprons, evening dresses, fur coats, parkas, waistcoats, boots, tights, swimming suits and bikinis.

Discover hidden collaborations