Determination of the external mass transfer coefficient and influence of mixing intensity in moving bed biofilm reactors for wastewater treatment

The possibilities of using jet aeration for biological wastewater treatment in small facilities were considered in the article. In shallow depth reservoirs, studies were carried out to change the sizes of the actively aerated zone with a decrease in the height of the liquid layer in the reservoir. The research was conducted for jet aerators with nozzles of the "keyway" type holes. It was established that a decrease in the relative depth of the reservoir makes it possible to increase the share of the beneficial use of the reservoir volume. This suggests that jet aeration will be most effective for reservoirs of relatively shallow depth. Based on the research results, a method for calculating a jet aerator was proposed, which makes it possible to evaluate the necessary parameters of the aerator based on the determination of the volumetric mass transfer coefficient.

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Determination of Quantitative Sodium Mass Transfer Coefficient During Osmotic Processing of Potatoes

Journal of Food Processing and Preservation ◽

10.1111/jfpp.12676 ◽

2015 ◽

Vol 40 (5) ◽

pp. 963-968 ◽

Cited By ~ 1

Author(s):

Troy Hinkley ◽

Janam Pandya ◽

Amanda J. Kinchla ◽

Eric A. Decker

Keyword(s):

Mass Transfer ◽

Transfer Coefficient ◽

Mass Transfer Coefficient

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The Influence of Optic and Polarographic Dissolved Oxygen Sensors Estimating the Volumetric Oxygen Mass Transfer Coefficient (KLa)

Modern Applied Science ◽

10.5539/mas.v10n8p142 ◽

2016 ◽

Vol 10 (8) ◽

pp. 142 ◽

Cited By ~ 1

Author(s):

Gustavo Andrés Baquero-Rodríguez ◽

Jaime A. Lara-Borrero

Keyword(s):

Mass Transfer ◽

Wastewater Treatment ◽

Dissolved Oxygen ◽

Transfer Coefficient ◽

Mass Transfer Coefficient ◽

Oxygen Transfer ◽

Airflow Rate ◽

Oxygen Probe ◽

Aeration System ◽

Oxygen Measurement

Aeration is usually the most energy intensive part of the wastewater treatment process. Optimizing the aeration system is essential for reducing energy costs. Field tests oriented to estimate parameters related to oxygen transfer are a common approach to compare aeration systems. The aim of this research is to assess the effect of dissolved oxygen probe lag on oxygen transfer parameter estimation. Experimental procedures regarding to process automation and control were applied to quantify dissolved oxygen probe lag. We have measured oxygen transfer in clean water, under a wide range of conditions (airflow rate, diffuser characteristics and diffuser density), with optic and polarographic sensors for dissolved oxygen measurement. The oxygen transfer was measured as per ASCE Standard procedures. Nonparametric statistical tests were used to compare the estimated volumetric mass transfer coefficient KLa with different sensors. According to the results, there is not significant influence of the probe lag (also known as time constant) or probe characteristics on the parameters used to assess oxygen transfer efficiency. This fact has great relevance in common practice of aerobic process for wastewater treatment because dissolved oxygen monitoring is used as an input for decision making related to the energy optimization in the aeration system. Findings from these tests contradict previous studies which claim that lag time in polarographic sensors for the dissolved oxygen measurement can bias estimate KLa.

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Determination of Filtration Properties and Mass Transfer Coefficient for Fractured Porous Media by Laboratory Test Data

Springer Proceedings in Earth and Environmental Sciences - Trigger Effects in Geosystems ◽

10.1007/978-3-030-31970-0_28 ◽

2019 ◽

pp. 257-267

Author(s):

Larisa Nazarova ◽

Leonid Nazarov

Keyword(s):

Mass Transfer ◽

Porous Media ◽

Laboratory Test ◽

Transfer Coefficient ◽

Mass Transfer Coefficient ◽

Test Data ◽

Fractured Porous Media ◽

Filtration Properties

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Determination of the ozone volumetric mass transfer coefficient in bubble column with two-fluid nozzle gas distributor

Hemijska industrija ◽

10.2298/hemind140716075d ◽

2015 ◽

Vol 69 (5) ◽

pp. 553-559 ◽

Cited By ~ 1

Author(s):

Milica Djekovic-Sevic ◽

Nevenka Boskovic-Vragolovic ◽

Ljiljana Takic ◽

Radmila Garic-Grulovic ◽

Srdjan Pejanovic

Keyword(s):

Mass Transfer ◽

Transfer Coefficient ◽

Mass Transfer Coefficient ◽

Bubble Column ◽

Operating Conditions ◽

Volumetric Mass Transfer Coefficient ◽

Gas Distributor ◽

Liquid Mass Transfer ◽

Two Fluid

Experimental investigation of gas-liquid mass transfer of ozone in water, in bubble column with two-fluid nozzle gas distributor (BKDM), under different operating conditions, are presented in this work. The main objective was to determine the ozone volumetric mass transfer coefficient, kL a, in calm uniform section of the column, under different values of gas and liquid flow rates. Obtained values of these coefficients were compared with the values in countercurrent bubble column. The critical liquid flowrate, when gas hold up reaches its maximum, was experimentally determined. It was shown that the maximum value of the ozone volumetric mass transfer coefficient is obtained just when liquid flowrate is at its critical value.

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Study of the Process of Wastewater Treatment with Activated Caron from Dimethylamine and Dimethylformamide in their Joint Presence

Ecology and Industry of Russia ◽

10.18412/1816-0395-2021-2-18-22 ◽

2021 ◽

Vol 25 (2) ◽

pp. 18-22

Author(s):

Yu.V. Solovyova ◽

V.P. Yustratov ◽

N.S. Golubeva ◽

I.V. Vasiljeva ◽

E.V. Nazimova

Keyword(s):

Mathematical Modeling ◽

Mass Transfer ◽

Wastewater Treatment ◽

Activated Carbon ◽

Aqueous Solutions ◽

Transfer Coefficient ◽

Mass Transfer Coefficient ◽

Adsorption Column ◽

Limiting Stage ◽

Column Process

The regularities and mechanism of adsorption of dimethylformamide and dimethylamine by industrial activated carbon in their joint presence from aqueous solutions are considered. The characteristics of equilibrium adsorption, the limiting stage, and the mass transfer coefficient have been determined. The main parameters of the adsorption column process and the mode of continuous cleaning are calculated by the method of mathematical modeling.

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