|
|
Application of Specific UV Absorbance (SUVA) for natural organic matter characterization
Vítková, Tereza ; Pivokonský, Martin (advisor) ; Načeradská, Jana (referee)
This bachelor thesis focuses on the characterization of parameter of specific UV absorbance (SUVA), which has currently been used during water treatment to estimate the potential of natural organic matter (NOM) to form by-products of water disinfection. SUVA is defined as the ratio of absorbance at 254 nm and the values of the concentration of dissolved carbon (DOC). First, SUVA was used as a surrogate parameter instead of more complex measurements to assess the potential formation of trihalomethanes (THMs) (Edzwald et al., 1985). Currently ability of the parameter SUVA to predict the formation of individual classes of DBPs (Disinfection By-Products) on hygiene of drinking water has been studied most. Most of the studies examine in particular the formation of THMs and HAAs (Haloacetic Acids) which are strictly regulated because of their harmful effect for the environment and human health. Its questionless advantage is a quick and easy setting directly in the water treatment plants. However, the existing studies provide quite contradictory conclusions regarding its practical benefits to predict how the water reacts with disinfectant and forms DBPs during the treatment. Based on the evaluation of the available literature SUVA seems to be more suitable for humic nature water which show high value SUVA...
|
|
|
Coagulation of organic matter produced by phytoplankton
Načeradská, Jana ; Pivokonský, Martin (advisor) ; Benešová, Libuše (referee) ; Janda, Václav (referee)
This dissertation thesis focuses on the removability of algal organic matter (AOM) by coagulation during water treatment and also on the influence of AOM on the coagulation of other substances present in source water. Special emphasis is put on the description of coagulation mechanisms. The effectiveness of AOM removal by coagulation was investigated by coagulation tests performed with optimized doses of coagulants (aluminium or ferric sulphate) under different pH values. Peptides and proteins contained in cellular organic matter of cyanobacterium Microcystis aeruginosa were used in the experiments since they have been previously reported to disturb the coagulation process. Moreover, peptides and proteins underwent coagulation experiments together with kaolin particles, representing clay particles in turbid waters, in both the presence and absence of coagulants to investigate the effect of AOM on the coagulation of turbid waters. To enable the description of coagulation mechanisms, AOM were characterised in terms of charge, functional groups, molecular weight and ability to form dissolved complexes with coagulant metals. The experimental results demonstrated that the removability of peptides and proteins is greatly dependent on pH value and on the properties of the involved particles or molecules....
|
|
| |
guest ::
