Nitrogen and aerobic treatment of slurry

Evans, Michael R.; Smith, Mark; Deans, E.A.; Svoboda, I. F.; Thacker, F.E.

doi:10.1016/0141-4607(86)90016-8

Cited by 26 publications

(5 citation statements)

References 5 publications

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“…Consequently, there have been large programmes of experimental research resulting in special attention on the biological treatment of piggery wastewater. Although the first studies concerned mainly the organic matter degradation and odour removal (Owens et al, 1973), the ability to remove nitrogen using this process was quickly identified and studied (Evans et al, 1986). As part of this experimental research, several process were studied: aerated lagoon (Oleszkiewicz, 1986), biofilm infiltration-percolation aerated system (Boiran et al, 1996), activated sludge process with an anoxic basin (Willers et al, 1993), activated sludge process with intermittent aeration (Bicudo and Svoboda, 1995) and sequential batch reactor (SBR) (Bortone et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

Modelling of biological nitrogen removal during treatment of piggery wastewater

Béline¹,

Boursier²,

Guiziou³

et al. 2007

Water Science and Technology

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During this study, a mathematical model simulating piggery wastewater treatment was developed, with the objective of process optimisation. To achieve this, the effect of temperature and free ammonia concentration on the nitrification rate were experimentally studied using respirometry. The maximum growth rates obtained were higher for ammonium-oxidising biomass than for nitrite-oxidising biomass for the temperatures above 20 degrees C; values at 35 degrees C were equal to 1.9 and 1.35 day(-1), respectively. No inhibition of nitrification was observed for free ammonia concentrations up to 50 mgN/L. Using these data with others experimental data obtained from a pilot-scale reactor to treat piggery wastewater, a model based on a modified version of the ASM1 was developed and calibrated. In order to model the nitrite accumulation observed, the ASM1 model was extended with a two-step nitrification and denitrification including nitrite as intermediate. Finally, the produced model called PiWaT1 demonstrated a good fit with the experimental data. In addition to the temperature, oxygen concentration was identified as an important factor influencing the nitrite accumulation during nitrification. Even if some improvements of the model are still necessary, this model can already be used for process improvement.

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Section: Introductionmentioning

confidence: 99%

Modelling of biological nitrogen removal during treatment of piggery wastewater

Béline¹,

Boursier²,

Guiziou³

et al. 2007

Water Science and Technology

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“…A similar value was obtained when animal manure was used as the substrate (3 mgO2/gbiomass•h). Nitrification in samples obtained from microalgae cultures grown in animal manure have been reported by some authors; this is because nitrogen in the form of ammonia nitrogen is present at very high concentrations in animal manures such as pig waste [34,35], with ammonium comprising up to 70% of the nitrogen present in liquid manure [36]. The animal manure used in this study contained up to 3.1 g NH 4 /L and it was diluted to 10% for use in the microalgae cultures.…”

Section: Evaluation Of the Metabolisms Prevailing In Different Culturesmentioning

confidence: 61%

A novel photo-respirometry method to characterize consortia in microalgae-related wastewater treatment processes

et al. 2020

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In this paper, a new photo-respirometry method for determining the rates of the main metabolic processes of microalgae-bacteria consortia in microalgae-based wastewater treatment processes has been developed and tested. The proposed protocol consists on applying dark and light periods to a microalgae-bacteria consortium in the presence of different substrates and measuring the rate of oxygen production. This allows determining the activity of microalgae, heterotrophic bacteria and nitrifying bacteria separately. The method has been optimized in terms of the operation strategy, including the starvation period required, the biomass concentration and the irradiance during the measurements. Results show that a starvation period of one to three days is necessary depending on the nutrient concentration. The optimal experimental conditions determined were a biomass concentration of 0.5 g/L and an irradiance of 200 μmol photons/m 2 •s. Furthermore, microalgae-bacteria samples from seven photobioreactors (indoor and outdoor) with different nutrient sources have been evaluated applying the methodology proposed. Regardless of the wastewater type, the microalgae activity is the main metabolic process, with heterotrophic activity increasing along with the chemical oxygen demand (COD) in the wastewater. Nitrifying activity was only observed when high ammonium concentrations were present. The developed method is a powerful tool to adequately manage and operate wastewater treatment processes using microalgae/bacteria consortia, providing valuable information to model wastewater treatment systems with microalgae and determine kinetic parameters.

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“…This suggests that O-N was converted into NO2 ratio. Comparable aerobic processing of manure nitrogen has also been reported previously [44][45][46][47][48]. Studies have shown that during complete nitrification, NO3 − can be reduced to NO by nitrite reductase, which is then reduced to N2O by nitric oxide reductase [49,50].…”

Section: Plant Nutrients In Aerobic and Anaerobic Environmentmentioning

confidence: 83%

Aerobic and Anaerobic Transformations in Estrogens and Nutrients in Swine Manure: Environmental Consequences

Singh

2015

Agriculture

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Pig manure is an excellent fertilizer and rich source of organic carbon and nitrogen compounds such organic nitrogen (O-N) (95% of total nitrogen) that is plant-unavailable-nitrogen (PUN) and mineralized nitrogen (about 1% of total nitrogen) such as ammonium (NH4 + ) and nitrate (NO3) that are plant-available-nitrogen (PAN). In addition, manure also contains two forms of estrogens: (i) poorly estrogenic thus essentially nontoxic conjugated estrogens (cEs) such as estrone (cE1), estradiol (cE2) and estriol (cE3); and (ii) highly estrogenic and toxic free estrogens (fEs) such as fE2, fE1 and fE3. This study showed that aerobic processing reduced concentrations of total carbon (TC), O-N, PAN and NH4 + /NH3 ratio, transiently hydrolyzed cEs (cE2 > cE1 > cE3) into corresponding fEs, transiently increased estrogenic activity and potential toxicity, and rapidly degraded fEs (fE2, fE1 > fE3), thus reducing the estrogenic activity in manure. Unlike aerobic processing, anaerobic processing stabilized and increased PAN and NH4 + /NH3 ratio, thus increasing the manure's fertilizer value. However, anaerobic processing, relative to aerobic processing, poorly hydrolyzed cEs (reducing transient toxicity and increasing reserve toxicity potential) and poorly degraded fEs (increasing toxicity) in manure. Thus, aerobic and anaerobic environments have distinct effects on manures' PAN and estrogenic activity, presenting an interesting dilemma: anaerobic incubation that increases manures' PAN does not effectively degrade estrogens, while aerobic incubation that effectively degrades estrogens (after transiently increasing their estrogenic activity) also decreases PAN, thus making manure less profitable. New techniques are need to fully use manure as organic fertilizer. OPEN ACCESSAgriculture 2015, 5 698

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Nitrogen and aerobic treatment of slurry

Cited by 26 publications

References 5 publications

Modelling of biological nitrogen removal during treatment of piggery wastewater

Modelling of biological nitrogen removal during treatment of piggery wastewater

A novel photo-respirometry method to characterize consortia in microalgae-related wastewater treatment processes

Aerobic and Anaerobic Transformations in Estrogens and Nutrients in Swine Manure: Environmental Consequences

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