Surfactants in Natural Waters and Their Effect on Gas-Liquid Mass Transfer.

0454428 - ÚCHP 2016 BG eng C - Conference Paper (international conference)
Stanovský, Petr
Surfactants in Natural Waters and Their Effect on Gas-Liquid Mass Transfer.
Book of Abstracts. Ozarow Mazowiecki: Nobell Compressing sp. z o.o, 2015 - (Kosinsky, K.; Urbanczyk, M.; Žerko, S.), s. 114. ISBN N.
[Smart and Green Interfaces: Fundamentals and Diagnostics. Sofia (BG), 29.10.2015-31.10.2015]
R&D Projects: GA ČR GAP504/12/1186
Institutional support: RVO:67985858
Keywords : bubble * mass transfer * surfactants
Subject RIV: CI - Industrial Chemistry, Chemical Engineering

Till now there is no systematical study about surface active substances (SAA) present in freshwater lakes. Literature is focused on marine environment only. Natural SAA consist of extracellular residues from phyto/zooplanktone as polysaccharides, lipids and proteins. During experiment with artificially created and naturally emitted methane bubbles from sediment in the lake with substantial presence of phyto/ zooplanktone we have found that bubbles with diameter from 1 mm to 12 mm rose with velocity of clean bubbles over distance several meters. This is in contrary with the method to identify SAA in natural waters proposed by Zawala et al.(2007). The effect of bubble expansion and desorption/absorption of gases is analyzed via modelling. The effect of SAA on gas-liquid transfer during methane ebullition from lake can be considered negligible then. Conversely one can assume enrichment of lake surface with SAA and gas transfer of dissolved gases through lake surface will be reduced.
Permanent Link: http://hdl.handle.net/11104/0255103