Image analysis procedure to derive bubble size distributions for better understanding of the oxygen transfer mechanism

Sponsors



Date: 11:20:00 - Nov 03 2016
Speakers: Giacomo Bellandi
Moderators:

Oxygen transfer in biological wastewater treatment represent the most energy demanding step of aerobic processes. Submerged aerators are designed to maximize the available surface for exchange by generating as fine bubbles as possible. Potential effects of process water characteristics on bubble sizes are too often not considered in wastewater treatment, while, liquid properties are known to have important effects on bubble size distribution (BSD) and transfer capabilities. The use of appropriate and consistent imaging tools is of crucial importance for detecting size changes in the distribution of bubbles. The bubble size distribution (BSD) image analysis tool is implemented in the Python environment, with the aim of creating a package under an open software licence. The BSD image analysis tool provided in this paper was specifically developed for measurements of bubbles in clean water and transparent surrogate liquids mimicking the characteristics of activated sludge. A selection of image processing techniques was implemented in this package in the Python environment, aimed at characterizing changes in BSD due to variations in liquid medium compositions that specifically occur in biological reactors. Given the consistency of the results in the different conditions tested and the ability to detect effects of hydrostatic pressure and variation in air flow and fluid characteristics on bubble sizes, the BSD image analysis tool proved to be a potential help in unravelling the dynamics behind oxygen transfer in wastewater applications.

Watch this session

This is a free OnDemand session

Watch Now



Speakers


Giacomo Bellandi
Giacomo Bellandi (University of Florence , Florence - Dipartimento di Ingegneria Civile e Ambientale (DICEA))

Moderators



Digital Edition

Asian Environmental Technology September 2018

September 2018

In This Edition Business News - Geotech appoints new territory manager for APAC region - DURAG Group acquire AP2E - Eco Expo Asia - Asia’s trusted trade fair for the green industry Gas...

View all digital editions

Events

International Technical Fair

Sep 24 2018 Plovdiv, Bulgaria

VA-MASSAN

Sep 25 2018 Jonkoping, Sweden

Ecwatech 2018

Sep 25 2018 Moscow, Russia

KIOGE 2018

Sep 26 2018 Almaty, Kazakhstan

View all events