600 MLD Membrane Bioreactor for Tertiary Nitrification in Hamilton, Ontario

Constantine, Tim; Chauvin, Dan; Bainbridge, Mark; Reiach, Lindsay; Crawford, George; Ferguson, Linda

doi:10.2175/193864706783750493

Cited by 1 publication

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“…Two schemes have been proposed to grow nitrifiers in a MBR and seed a high rate BNR process (Constantine et al, 2001, Daigger and Crawford, 2005, Constantine et al, 2006 but results on pilot or full-scale trials have not yet been reported. Another approach was evaluated at benchscale by Constantine (1996) whereby two parallel activated sludge processes were run at 9, 15 and 20 C, one with a high SRT and one with a low SRT.…”

Section: Seeding From Parallel Processesmentioning

confidence: 99%

Improving Nitrification through Bioaugmentation

Parker¹,

Wanner²

2007

proc water environ fed

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The high costs of upgrading treatment plants for either nitrification or nutrient removal has spurred many investigators to examine bioaugmentation as a means to increase nitrification rates and thereby reduce the costs (and space requirements) for nitrification. In the case of biological nutrient removal (BNR) plants, this would allow release of reactor space to accommodate either nitrogen removal or phosphorus removal or both. In this paper, two types of bioaugmentation schemes are reviewed, external and in situ. Both types apply to activated sludge systems, while only in situ schemes apply to fixed film systems. The advantage of external bioaugmentation schemes is that the promotion of nitrification within the mainstream process can be decoupled from its aerobic SRT. The advantage of in situ schemes is that there is less concern about the loss of activity of the seed nitrifiers when transferred to the mainstream process, because their conditions of growth are similar to those prevalent in the mainstream process. The literature is reviewed on all process types, and new information is provided on the Bioaugmentation R (BAR) process which has seen the broadest full-scale applications of any bioaugmentation scheme. The various forms of bioaugmentation are compared and contrasted and the practical limitations in their implementation are reviewed.

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Section: Seeding From Parallel Processesmentioning

confidence: 99%