Evaluation of modelled and measured patterns of dissolved oxygen in a freshwater lake as an indicator of the presence of biodegradable organic pollution
Od. Ansa-asare et al., Evaluation of modelled and measured patterns of dissolved oxygen in a freshwater lake as an indicator of the presence of biodegradable organic pollution, WATER RES, 34(4), 2000, pp. 1079-1088
Changes in dissolved oxygen (DO) cycling patterns in natural surface waters
have been shown to be useful as a potential indicator of biodegradable: or
ganic pollution. The effect has been demonstrated by dosing a water body wi
th 2.5 and 5.0 mg l(-1) TOC, added as pot-ale, and monitoring the DO values
continuously for 96 h. These loadings were added to water columns (in tube
s) suspended from a raft in a small lake in North East Scotland. The additi
on of organic pollution burden to the lake water produced two effects. The
mean DO value was lowered initially, but increased as organic loading was c
onsumed. Secondly, the amplitude of the DO cycle increased as organic loadi
ng increased from 2.5 to 5.0 mg l(-1) TOC. From the results of a DO dynamic
model developed in this project, and from the lake raft experiments, it ca
n be concluded that dissolved oxygen cycles may be useful as an indicator o
f biodegradable organic pollution load. (C) 2000 Elsevier Science Ltd. All
rights reserved.