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Aluminium fractionation in water treatment.
Houšková, Lucie ; Benešová, Libuše (advisor) ; Janečková, Lucie (referee)
Aluminium and natural organic compounds are common components of surface water in our country. Removal of these substance represents one of basic problems of water treatment. Chemical treatment process is based on particles destabilisation and aggregation. The efficiency of treatment is influenced by many chemical and physical factors (the reaction conditions, type and dosage of destabilisation reagens, reactive pH, the mean velocity gradient and the period of its duration). Common water treatment technologies are based on the reagent doeses optimisation. Properties of formed aggregates (namely their size, shape and density) and their separation capabilities are influenced by the magnitude of the velocity gradient and the period of its application. This thesis is focused on the optimisation of doses of alum - Al2(SO4)3.18 H2O and the properties of aggregation. For increasing of alkalinity the lime water was used as an alkalisation reagent. Laboratory tests were conducted by jar test using the variable speed paddle gang stirrer. The result showes that Al2(SO4)3.18 H2O is suitable destabilisation reagens, but salts of the Fe3+ ionts are better.
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Aluminium fractionation in water treatment.
Houšková, Lucie ; Benešová, Libuše (advisor) ; Janečková, Lucie (referee)
Aluminium and natural organic compounds are common components of surface water in our country. Removal of these substance represents one of basic problems of water treatment. Chemical treatment process is based on particles destabilisation and aggregation. The efficiency of treatment is influenced by many chemical and physical factors (the reaction conditions, type and dosage of destabilisation reagens, reactive pH, the mean velocity gradient and the period of its duration). Common water treatment technologies are based on the reagent doeses optimisation. Properties of formed aggregates (namely their size, shape and density) and their separation capabilities are influenced by the magnitude of the velocity gradient and the period of its application. This thesis is focused on the optimisation of doses of alum - Al2(SO4)3.18 H2O and the properties of aggregation. For increasing of alkalinity the lime water was used as an alkalisation reagent. Laboratory tests were conducted by jar test using the variable speed paddle gang stirrer. The result showes that Al2(SO4)3.18 H2O is suitable destabilisation reagens, but salts of the Fe3+ ionts are better.
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Optimization of the coagulation of water with higher concentration of aluminium
Tomášková, Hana ; Benešová, L.
High concentration of aluminium in water reservoirs can lead to higher concetration of residual aluminium in drinking water and then it can cause some health problems. For this reason is very important to optimalise the condition of water treatment, the main problem is inadvisable type and wrong dose of the coagulant and unsuitable intensity and duration of mixing. Optimalization with aluminium sulphate and ferric sulphate was made with raw water from two drinking water reservoirs Pilská and Lázská in Czech Republic
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