In situ characterization of nitrifying biofilm: Minimizing biomass loss and preserving perspective

Delatolla, Robert; Tufenkji, Nathalie; Comeau, Yves; Lamarre, Daniel; Gadbois, Alain; Berk, Dimitrios

doi:10.1016/j.watres.2009.01.009

Cited by 49 publications

(34 citation statements)

References 44 publications

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“…9 10 3 mL -1 ) Diatom (org. 9 10 3 mL -1 ) (Delatolla et al 2009;Vlaeminck et al 2010), and the establishment of these colonies may be influenced by the particle size, which is determined by the water shear rate. Larsen et al (2008) showed that increased shear rates in activated sludge systems formed particles smaller than the medium size of a colony (13-22.5 lm) of the ammonia- oxidizing bacteria Nitrosomonas oligotropha, which led to a low rate of ammonia oxidation that was similar to the rate observed in our study.…”

Section: Discussionmentioning

confidence: 99%

The use of different aerators on Litopenaeus vannamei biofloc culture system: effects on water quality, shrimp growth and biofloc composition

et al. 2016

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This study evaluated the effects of different aeration types on water quality, shrimp growth and biofloc composition in a Litopenaeus vannamei culture. The study was conducted with three treatments: (1) PR-propeller aspirator pump aerator; (2) VP-vertical pump aerator; and (3) BL-diffused air blower. The study was performed in a greenhouse with nine 35,000-L rectangular tanks. Water quality parameters (temperature, salinity, dissolved oxygen, pH, ammonia, nitrite, nitrate, settleable and suspended solids) were measured along the 33 experimental days. Moreover, samples were collected to quantify the microorganisms present in the tanks. At the end of the study, samples of the biofloc of each tank were collected to proximal analysis. Throughout the experiment, the temperature, pH, salinity and alkalinity were maintained within the recommended levels for L. vannamei. The propeller treatment showed a concentration of total ammonia above the recommended levels and lower densities of ciliates and flagellates, most likely because of inadequate biofloc formation in this treatment. The final weight was higher in the blower and propeller treatments. However, survival was lower in the propeller treatment compared to the other treatments. The results of this study suggest that diffused air systems (air blower) improve the formation of biofloc and growth performance of L. vannamei.

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Section: Discussionmentioning

confidence: 99%

The use of different aerators on Litopenaeus vannamei biofloc culture system: effects on water quality, shrimp growth and biofloc composition

et al. 2016

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“…For details see Turonova et al (2016) (see also video S1) # Hana Turo nov a. Reuse not permitted. Delatolla et al, 2009;Hannig et al, 2010;Karcz et al, 2012;Pompilio et al, 2015). However, reduced resolution can occur because of the lack of conductivity in the wet sample, or when a rapid image capture is required for samples moving or changing their structure during examination.…”

Section: Microscopy Methodsmentioning

confidence: 99%

Critical review on biofilm methods

Azeredo

Azevedo

Briandet

et al. 2016

Critical Reviews in Microbiology

760

679

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Biofilms are widespread in nature and constitute an important strategy implemented by microorganisms to survive in sometimes harsh environmental conditions. They can be beneficial or have a negative impact particularly when formed in industrial settings or on medical devices. As such, research into the formation and elimination of biofilms is important for many disciplines. Several new methodologies have been recently developed for, or adapted to, biofilm studies that have contributed to deeper knowledge on biofilm physiology, structure and composition. In this review, traditional and cutting-edge methods to study biofilm biomass, viability, structure, composition and physiology are addressed. Moreover, as there is a lack of consensus among the diversity of techniques used to grow and study biofilms. This review intends to remedy this, by giving a critical perspective, highlighting the advantages and limitations of several methods. Accordingly, this review aims at helping scientists in finding the most appropriate and up-to-date methods to study their biofilms. ARTICLE HISTORY

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“…[7] More recently, the ability of the MBBR system to maintain nitrification during extensive exposure to very cold temperatures has promoted these systems as upgrade options to existing plants in the northern and colder regions. [8,9] There are many marketed carrier types for MBBR systems. These carriers differ in size, shape, pore spacing and surface area.…”

Section: Introductionmentioning

confidence: 99%

Carrier effects on tertiary nitrifying moving bed biofilm reactor: An examination of performance, biofilm and biologically produced solids

Forrest

Delatolla

Kennedy

2015

Environmental Technology

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Increasingly stricter ammonia and nitrogen release regulations with respect to wastewater effluents are creating a need for tertiary treatment systems. The moving bed biofilm reactor (MBBR) is being considered as an upgrade option for an increasing number of wastewater treatment facilities due to its small footprint and ease of operation. Despite the MBBRs creation as a system to remove nitrogen, recent research on MBBR systems showing that the system's performance is directly related to carrier surface area and is irrespective of carrier shape and type has been performed exclusively on chemical oxygen demand (COD) removal systems. Furthermore, the influence of carrier type on the solids produced by MBBR systems has also been exclusively studied for COD removal systems. This work investigates the effects of three specific carrier types on ammonia removal rates, biofilm morphology, along with solids production and settleability of tertiary nitrifying MBBR systems. The study concludes that carrier type has no significant effect on tertiary nitrifying MBBR system performance under steady, moderate loading conditions. The research does however highlight the propensity of greater surface area to volume carriers to become clogged under high loading conditions and that the high surface area carriers investigated in this study required longer adjustment periods to changes in loading after becoming clogged.

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In situ characterization of nitrifying biofilm: Minimizing biomass loss and preserving perspective

Cited by 49 publications

References 44 publications

The use of different aerators on Litopenaeus vannamei biofloc culture system: effects on water quality, shrimp growth and biofloc composition

The use of different aerators on Litopenaeus vannamei biofloc culture system: effects on water quality, shrimp growth and biofloc composition

Critical review on biofilm methods

Carrier effects on tertiary nitrifying moving bed biofilm reactor: An examination of performance, biofilm and biologically produced solids

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