Demonstration of Low Temperature Nitrification With a Short SRT

Kos, Peter; Head, Melanie A.; Oleszkiewicz, Jan A.; Warakomski, Alphonse

doi:10.2175/193864700784545676

Cited by 7 publications

(8 citation statements)

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“…This experiment is an extension of work presented by Kos et al (1998Kos et al ( , 2000 and Head and Oleszkiewicz (2000) who showed, with modeling, that by seeding nitrifying biomass the operating SRT of a wastewater treatment system could be significantly decreased while still maintaining full nitrification. But, the effects of sudden change in temperature on nitrification rates should be considered.…”

Section: Introductionmentioning

confidence: 56%

“…Four 2 L SBRs were operated with an SRT of 4 days at 10 o C. The reactors were fed synthetic wastewater and had HRTs of 43.6 h, 53.3 h, 68.6 h and 96 h. These long HRTs were originally chosen because it was already known that the nitrification rates would be severely decreased by the sudden change in temperature (Kos et al 2000, Head and and there would be dilution effects. Feeding and decanting was once per day and wasting occurred immediately before settling by removing one quarter of the reactor volume.…”

Section: Operation Of Cold Sbrsmentioning

confidence: 99%

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Short SRT Nitrification Through Seeding Nitrifying Bacteria Into Cold, Non-Nitrifying Sequencing Batch Reactors

Head¹,

Oleszkiewicz²

2002

proc water environ fed

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This study was developed to determine whether nitrifying bacteria grown on centrate at 20, 25, and 30 o C could induce nitrification in sequencing batch reactors (SBRs) operating at 10 o C with a solids retention time (SRT) of 4 days. A seeding rate of 6.7 mg VSS/L·d with biomass acclimated to 20 o C achieved full nitrification in SBRs with hydraulic retention times (HRTs) greater than 43.3 hours. When seeding was stopped, effluent ammonia nitrogen (NH 3 -N) concentrations increased quickly, eventually reaching influent levels. When the HRT was reduced to 24 hours, partial NH 3 -N removal was achieved for all three of the nitrifying biomasses. Nitrification was not induced in any reactors when HRT was 12 hours.

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Section: Introductionmentioning

confidence: 56%

Section: Operation Of Cold Sbrsmentioning

confidence: 99%

Short SRT Nitrification Through Seeding Nitrifying Bacteria Into Cold, Non-Nitrifying Sequencing Batch Reactors

Head¹,

Oleszkiewicz²

2002

proc water environ fed

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“…Bioaugmentation of activated sludge has several practical conceptions: B.A.B.E [16,17], Maureen [18], InNitri [19], BAR [20]which were implemented in full scale. ASM1 model has been addressed in hundreds of papers.…”

Section: Related Workmentioning

confidence: 99%

Encouraging “K” strategy nitrifiers over “r” strategists in bioaugmentation reactor

Zięba

Janiak

2017

E3S Web Conf.

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Abstract. Bacteria responsible for ammonia oxidization (AOB) can be differed into two groups which have different bio kinetic parameters. Those groups are slow growing bacteria with lower half saturation coefficient for NH4 (k -strategist) and fast growing bacteria with higher half saturation coefficient for NH4 (r-strategist). By controlling operational conditions of process it is possible to create dominance of one of those colonies to enhance the nitrification rate. Therefore model of sequencing bath reactor was developed to study the correlation of bioaugmentation of the side stream breeder reactor and predominant AOB culture. The course of the study was to find the minimal bioaugmentation influent of AOB rich recycled sludge to create dominance of k-strategist in the side stream reactor with maintaining maximal possible increase of overall AOB load. In addition operating conditions like sludge retention time, NH4 concentration and loading regimes was investigated to determine the optimum for the process.

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“…The InNitri ® reactor nitrifies ammonia from the dewatering sidestream, while seeding the activated sludge system with nitrifying bacteria generated within the reactor. The process was developed for plants in northern climates that needed to upgrade to year-round nitrification or total nitrogen removal (Kos et al, 2000). The challenge for these plants is that the liquid treatment process did not have adequate aeration tank volume to maintain the long SRTs needed at low temperatures to keep an adequate population of nitrifiers.…”

Section: In-nitri ® Process For Ammonia Removalmentioning

confidence: 99%

Sidestream Treatment vs. Mainstream Treatment of Nutrient Returns When Aiming for Low Effluent Nitrogen and Phosphorus

Phillips¹,

Kobylinski²

2007

proc water environ fed

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Many wastewater treatment utilities are facing a common problem: the combination of decreasing discharge limits, increasing flows and loads, reduced budgets, and limited land for plant expansions. When planning an expansion of a facility with stringent permit limits (3 mg/L total nitrogen, TN; 0.3 mg/L total phosphorus, TP), it is important to create and make use of a dynamic mass balance that considers all nutrient loads to the plant, whether it be raw wastewater, hauled biosolids, or sidestreams generated during biosolids processing. Sidestream loads are often over-looked in plant design and operations, and when dewater occurs during the day shifts only, the impacts of sidestream loads are worsened because they are being recycled when the plant influent loads are the highest. Regionalization of biosolids processing is a current trend to reduce costs by processing biosolids from two or more facilities at one central facility, but this practice can generate high-strength sidestreams. As the facility imports biosolids, it also imports nutrients tied within the solids which are released during digestion and returned to the mainstream process in the dewatering sidestream. This can double or even triple the raw influent nutrient concentrations. In extreme cases, sidestream treatment may be warranted, but only after an evaluation has been conducted to show that constructing a sidestream treatment facility is more economical than handling the sidestream at the existing mainstream plant. Simulators such as BioWin (Envirosim) and GPS-X (Hydromantis) are powerful tools for generating plant-wide nutrient mass balances, and this paper will present examples of how they can be used to weigh two options: 1) managing sidestreams in the mainstream treatment processes, or 2) treating sidestreams before they are returned to the main plant.

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Demonstration of Low Temperature Nitrification With a Short SRT

Cited by 7 publications

References 0 publications

Short SRT Nitrification Through Seeding Nitrifying Bacteria Into Cold, Non-Nitrifying Sequencing Batch Reactors

Short SRT Nitrification Through Seeding Nitrifying Bacteria Into Cold, Non-Nitrifying Sequencing Batch Reactors

Encouraging “K” strategy nitrifiers over “r” strategists in bioaugmentation reactor

Sidestream Treatment vs. Mainstream Treatment of Nutrient Returns When Aiming for Low Effluent Nitrogen and Phosphorus

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