Abstract
Factors affecting the permissible limits of sludge mixture circulation rate are given for airlift reactor-clarifier with a suspended layer. The upper limit of the circulation rate is justified as a function of some geometric dimensions of the bioreactor and the hydraulic load on the clarifier to comply with conditions of a suspended layer existence. The lower limit of the circulation rate was obtained on the basis of two conditions: the duration of the active sludge stay in anoxic conditions and the observance of recommended rates in the construction in order to avoid the settling of active sludge. Theoretical and empirical dependences of the maximum permissible values of the circulation rate on the main geometric parameters and on productivity of the airlift reactor-clarifier are presented.
Highlights
In recent years, airlift reactors are widely used for a variety of biological and chemical processes [1,2,3]
The Donbas National Academy of Civil Engineering and Architecture has developed a biological treatment facility in which an airlift bioreactor with internal circulation is combined with a clarifier i.e. airlift reactor-clarifier with a suspended layer [11]
The empirical formula 5 was obtained by processing experiment data to determine maximum values of circulation rates at which no washing out of suspended layer occurs
Summary
Airlift reactors are widely used for a variety of biological and chemical processes [1,2,3] These facilities may contain activated sludge and serve for aerobic wastewater treatment [4, 5]. The aeration system of airlift bioreactors with internal circulation is a flooded airlift, i.e. airlift, the upper section of which is located below the free surface of the aerated fluid Such facilities allow combining the processes of nitrification and denitrification, which positively affects the technical and economic efficiency of wastewater treatment from nitrogen compounds and organic pollutants [6,7,8,9]. Clarification is carried out by means of a being formed suspended layer of activated sludge
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
