Optimal Surface Aeration Control in Full-Scale Oxidation Ditches through Energy Consumption Analysis

Qiu, Yong; Zhang, Chi; Li, Bing; Li, Ji; Zhang, Xiaoyuan; Liu, Yanchen; Liang, Peng; Huang, Xia

doi:10.3390/w10070945

Cited by 10 publications

(5 citation statements)

References 42 publications

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“…The following are the advantages of oxidation ditches: the impact of a shock load is reduced by a long hydraulic retention time and complete mixing; sludge production is lower than in other biological treatment methods; and, when compared to other biological treatments, the operations use less energy [19]. The cost of constructing oxidation ditches varies depending on wastewater treatment plant capacity, effluent standards, land price, local construction prices, and local-specific design effluent limitations [19]. To achieve sustainable community development, wastewater treatment plants must achieve two main goals: energy saving and funds saved for WWTP improvements.…”

Section: Introductionmentioning

confidence: 99%

Oxidation Ditches for Recycling and Reusing Wastewater Are Critical for Long-Term Sustainability—A Case Study

et al. 2022

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Because the cost of operation and maintenance is lower than those of chemical treatments, the aerobic biological oxidation method used to treat wastewater is very effective. An oxidation ditch can be classified as progressive aeration-activated sludge capable of removing organic pollutants and also nitrogen and phosphorus. The overall goal of this research is to analyse influent, effluent, and operating data over a seven-year period (2014–2020) to better understand process performance, identify knowledge gaps, and suggest potential improvements for the operating efficiency of the wastewater treatment plant (WWTP) in Bishah Governorate, which works with oxidation ditch technology. An examination of historical influent, effluent, and operational data shows that the Bishah WWTP has consistently met the national and international guidelines for wastewater reuse in restricted and unrestricted irrigation. The effluent ratio of the biodegradable organic material (BOD5)/chemical oxygen demand (COD) values ranged from 0.3 to 0.51 with an average of 0.41. Significant Pearson correlation coefficients (bivariate) between physico-chemicals merit, especially in total coliforms form, BOD5 and ammonia. It could be concluded that the operational performance of a wastewater treatment plant with an oxidation ditch in Bishah is working well according to national and international standards.

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Section: Introductionmentioning

confidence: 99%

Oxidation Ditches for Recycling and Reusing Wastewater Are Critical for Long-Term Sustainability—A Case Study

et al. 2022

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“…Simulation of flow in an oxidation ditch bioreactor driven by mechanical surface aerator was performed using CFD [8]. Yong et al [9] proposed an integral energy model to optimize the surface aeration control in oxidation ditches using CFD model in their study. Their control system achieved 10% saving in energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics-based design of anoxic bioreactor zone in wastewater treatment plant

Amin¹,

Elsakka²,

Oterkus³

et al. 2022

Desalination and Water Treatment

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Hydrodynamics-based design of an anoxic bioreactor tank is one of the serious challenges in wastewater industry. Poor fluid flow may cause settlement and therefore reduce the biological performance of a bioreactor. Whilst, a successful bioreactor design can facilitate the enhancement of biological process efficiency and reduction of energy consumption so that the investment and operation cost can be kept as low as possible. In the present study, three-dimensional computational fluid dynamics models for three common full-scale bioreactor configurations were simulated using a single-phase flow model and the standard two-equation SST k-ε turbulence model. The main objective of this numerical study is to investigate the effect of bioreactor geometry on the hydrodynamics performance of the flow field. Four submerged impellers were modelled for each tank geometry and three thrust scenarios were considered in order to evaluate the effect of changing impeller thrust on the flow velocity distribution inside each tank. The results show that the orbal bioreactor geometry has better performance in driving the flow field with more uniform flow patterns than other bioreactor configurations. The minimum flow velocity required was achieved in orbal tank to maintain the micro-organism particles suspended in the wastewater media at certain mixing power.

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“…Sin embargo, el consumo energético requerido en este proceso es elevado y representa entre 50 y 90 % de la energía total utilizada durante la restauración del cuerpo de agua [18]. Por otra parte, la transferencia de OD también puede ser afectada por factores físicos, ambientales, y microbianos, los cuales dificultan y reducen la eficiencia del proceso [19], [20]. al momento de impactar y sumergirse dentro del cuerpo de agua, generando un mayor costo de operación del proceso.…”

Section: Introductionunclassified

Efecto de la potencia y número de aspas de un aireador rotativo sobre la transferencia de oxígeno disuelto en agua

Blanco-Zúñiga

Vega

Rojas-Arias

2022

Ing.

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Contexto: La transferencia del oxígeno disuelto (OD) es un tema de importancia para la calidad del agua. Diversos dispositivos se han diseñado para suministrar el OD requerido en algunos cuerpos de agua durante su tratamiento y restauración; sin embargo, estos conllevan un alto consumo de energía, requiriendo optimizar los parámetros de uso. Método: Este trabajo estudió el efecto de la potencia y número de aspas utilizadas en un aireador de eje horizontal. Las mediciones se realizaron en muestras de agua anóxica, utilizando tres dispositivos aireadores conformados por 6, 12 y 24 aspas, variando la velocidad de rotación a partir del voltaje suministrado. Resultados: Los mayores valores obtenidos del coeficiente de transferencia KLa se presentan en dispositivos con mayor cantidad de aspas. Sin embargo, la eficiencia estándar de aireación (SAE) y la eficiencia de transferencia de oxígeno estándar (SOTR) revelaron que el dispositivo con 6 aspas presenta una mayor eficiencia energética. Conclusiones: Se demostró que la transferencia de OD no depende únicamente de los impactos asociados al número de aspas, y que la máxima eficiencia en la transferencia se obtiene con un menor número de aspas. Estos resultados pueden contribuir en mejorar el entendimiento del funcionamiento de estos sistemas mecánicos en términos de transferencia de OD.

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Optimal Surface Aeration Control in Full-Scale Oxidation Ditches through Energy Consumption Analysis

Cited by 10 publications

References 42 publications

Oxidation Ditches for Recycling and Reusing Wastewater Are Critical for Long-Term Sustainability—A Case Study

Oxidation Ditches for Recycling and Reusing Wastewater Are Critical for Long-Term Sustainability—A Case Study

Computational fluid dynamics-based design of anoxic bioreactor zone in wastewater treatment plant

Efecto de la potencia y número de aspas de un aireador rotativo sobre la transferencia de oxígeno disuelto en agua

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