Simulation of energy balance and carbon dioxide emission for microalgae introduction in wastewater treatment plants

Nordlander, Eva; Olsson, Jesper; Thorin, Eva; Nehrenheim, Emma

doi:10.1016/j.algal.2017.03.026

Cited by 25 publications

(6 citation statements)

References 36 publications

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“…c o m / l o c a t e / s c i t o t e n v reduce aeration and energy costs of wastewater treatment systems (Manser et al, 2016). The overall energy use in municipal treatment plants varies between 0.30 and 0.78 kWh m −3 (Nordlander et al, 2017), of which 45-75% may be due to the mechanised aeration process (Stenstrom and Rosso, 2008). In particular nitrogen removal in conventional activated sludge systems requires high inputs of energy for aeration.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Photo-oxygenation for nitritation and the effect of dissolved oxygen concentrations on anaerobic ammonium oxidation

Mukarunyana

Vossenberg

Lier

et al. 2018

Science of The Total Environment

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Removal of nitrogen from wastewater without using electricity consuming aerators was previously observed in photo-bioreactors with a mixed algal-bacterial biomass. Algammox is the particular process based on algae, ammonium oxidizing organisms and anammox bacteria. In this research the activity of anammox bacteria in such an oxygen-producing environment was tested, as well as the effect of short-duration increase in dissolved oxygen (DO) to values potentially inhibiting anammox activity. Sequencing batch photo-bioreactors were fed with settled domestic wastewater enriched with ammonium (200mgNH-N/L) and exposed to light within the photosynthetic active range with intensity of about 500μmol/m·s. Each cycle consisted of 12h illumination and 12h darkness. A well-settling biomass (10days solids retention time) developed that carried out nitritation, nitrification and anammox. Ammonium removal rate during the light period was 4.5mgN-NH/L·h, equal to 858mgN-NH/m·h or 477mgN-NH/(mol photons). When the reactors were aerated for 3h to temporarily increase the DO, anammox was inhibited at bulk DO values larger than 0.4-1.0mg/L. For almost oxygen saturated conditions, recovery time was about 9days. Algammox photo-bioreactors are therefore able to overcome short periods of oxygen stress, provided they occur only occasionally.

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Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Photo-oxygenation for nitritation and the effect of dissolved oxygen concentrations on anaerobic ammonium oxidation

Mukarunyana

Vossenberg

Lier

et al. 2018

Science of The Total Environment

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“…Domestic wastewater comes from a wide range of sources and needs to be treated prior to discharge. The conventional activated sludge and aerobic granular sludge (AGS) have been widely applied for domestic wastewater treatment at present, but there are problems such as high energy costs [1], CO 2 emissions [2], large excess sludge production [3,4], etc. In view of this, an innovative and promising microalgal-bacterial granular sludge (MBGS) process has emerged [5].…”

Section: Introductionmentioning

confidence: 99%

Reactivation of Frozen Stored Microalgal-Bacterial Granular Sludge under Aeration and Non-Aeration Conditions

Shen

Zhu

et al. 2021

Water

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In this paper, reactivation of microalgal-bacterial granular sludge (MBGS) stored at −20 °C for 6 months was investigated under respective aeration (R1) and non-aeration (R2) conditions. Results showed that the granular activity could be fully recovered within 21 days. The average removal efficiency of ammonia was higher in R1 (92.78%), while R2 showed higher average removal efficiencies of organics (84.97%) and phosphorus (85.28%). It was also found that eukaryotic microalgae growth was stimulated under aeration conditions, whereas prokaryotic microalgae growth and extracellular protein secretion were favored under non-aeration conditions. Sequencing results showed that the microbial community underwent subversive evolution, with Chlorophyta and Proteobacteria being dominant species under both conditions. Consequently, it was reasonable to conclude that the activity and structure of frozen stored MBGS could be recovered under both aeration and non-aeration conditions, of which aeration-free activation was more feasible on account of its energy-saving property. This study provides important information for the storage and transportation of MBGS in wastewater treatment.

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“…In addition, to simulate the performance of wastewater treatment, a full-scale wastewater treatment plant with a moving bed bioreactor (MBBR) and ballasted separation process was designed [11]. In the research of Nordlander, et al (2017), the activated sludge process was replaced with a microalgae-activated sludge process in a case study in Sweden. Based on mass and energy balances of biological treatment and sludge handling process steps, the impacts on heat and electricity consumption, as well as carbon dioxide emissions, were analyzed in a system model [12].…”

Section: Introductionmentioning

confidence: 99%

“…In the research of Nordlander, et al (2017), the activated sludge process was replaced with a microalgae-activated sludge process in a case study in Sweden. Based on mass and energy balances of biological treatment and sludge handling process steps, the impacts on heat and electricity consumption, as well as carbon dioxide emissions, were analyzed in a system model [12]. Baklouti, et al (2018) have progressed a univariate statistical methodology that uses an improved particle iltering(IPF)based multiscale optimized exponentially weighted moving average chart (MS-OEWMA) to enhance the monitoring of wastewater treatment plants [13].…”

Section: Introductionmentioning

confidence: 99%

Simulating the dispersion of poisonous organic chemical compounds in wastewater treatment process through the active sludge method using the TOXChem model

Masoomi¹,

Azizi²,

Aghlmand³

et al. 2021

Ann Biomed Sci Eng

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Naturally, microorganisms decompose the organic material existing in nature, both in the presence or absence of oxygen. The majority of materials such as poisonous chemical compounds, heavy metals, would prevent the treatment process from taking place, lead to the entry of these contaminants into the environment results in the emergence of numerous diseases. In the present study, using the TOXChem4.1 simulation model, attempts were made to simulate a wastewater treatment plant and then assess the dispersions of contaminants including 1,2-Dimethylnaphthalene, 1,3-Dinitropyrene, 1,6-Dimethylnaphthalene, 1,6-Dinitropyrene, and 17a-ethinylestradiol (EE2) in concentrations of a common scenario. The results of computer simulations showed that the EE2 contaminant is of the highest percentage of decomposition among others, due to its wider chemical structure. Consequently, it is clear that such contaminant is of the highest mass in the sludge exiting the treatment plant. In addition, the results of the simulations demonstrated that the highest volumes of gaseous pollutants take place in the modulation and initial sedimentation units.

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Simulation of energy balance and carbon dioxide emission for microalgae introduction in wastewater treatment plants

Cited by 25 publications

References 36 publications

Photo-oxygenation for nitritation and the effect of dissolved oxygen concentrations on anaerobic ammonium oxidation

Photo-oxygenation for nitritation and the effect of dissolved oxygen concentrations on anaerobic ammonium oxidation

Reactivation of Frozen Stored Microalgal-Bacterial Granular Sludge under Aeration and Non-Aeration Conditions

Simulating the dispersion of poisonous organic chemical compounds in wastewater treatment process through the active sludge method using the TOXChem model

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