Abstract
Abstract In situ measurement campaigns of primary clarifiers are rarely implemented properly because of their cost, time, and energy demand. Hydrodynamic modelling possibilities for such reactors have been intensely examined recently, but on-site factors affecting flow characteristics (e.g. flow distributors) have not received sufficient attention. This paper describes the use of ANOVA in examining fine resolution flow datasets and the related decision support method for in situ measurement campaigns and subsequent modelling processes. The characteristics of the flow and the applicability of 2D and 3D methods to investigate hydrodynamic features are discussed through the example of a rectangular primary clarifier, also considering the reproducibility of measurements ranging from typical nominal flow rates to peak loads. Based on the data, recommendations are provided on the adequate sizing of a measurement campaign, potentially reduced to a single longitudinal section (2D measurement). According to our results, performing hydrodynamic measurements with a 2D-arrangement of measuring points is sufficient in the case of such clarifiers, also with regard to the design processes. When applying the described methods, the related efforts and costs may be reduced and estimated more easily. However, care should be taken when applying this method to determine the spacing of measuring points correctly.
Highlights
Regarding the settling tanks used for wastewater treatment, very few references are available on the implementation of in situ measurement campaigns using measuring profiles; that is, vertical profiles along which flow and/or water quality are measured (Imam et al 1983; Mazzolani et al 1998; Ekama & Marais 2000; Patziger 2007; Burt 2010; Ramin et al 2014; Patziger & Kiss 2015; Das et al 2016)
The design of the inlet structure should rely on hydrodynamic principles
(i) Spatial arrangement of measuring points to establish flow characteristics: the analysis of variance (ANOVA) analysis of repeated measurements showed no significant difference between profiles within individual crosssections
Summary
Regarding the settling tanks used for wastewater treatment, very few references are available on the implementation of in situ measurement campaigns using measuring profiles; that is, vertical profiles along which flow and/or water quality are measured (Imam et al 1983; Mazzolani et al 1998; Ekama & Marais 2000; Patziger 2007; Burt 2010; Ramin et al 2014; Patziger & Kiss 2015; Das et al 2016). The drawing of in-depth conclusions about the hydrodynamic behaviour of the liquid in a wastewater reactor requires carefully measured datasets and their statistical evaluation regarding flow and turbulence features. Campaigns in recent years have been characterized by 3D measurement scales and an increased number of replicates under identical hydraulic conditions, presumably as a result of technological improvements
Sign-in/Register to view highlights & summary 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.
