Wyniki wyszukiwania - BazTech

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Badania skuteczności wybranych procesów technologicznych w oczyszczaniu wody o dużej intensywności barwy

Perchuć M., Jaroszewska M.

Ochrona Środowiska

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2007

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R. 29, nr 3

29-33

PL

Barwa wód podziemnych wywołana obecnością kwasów huminowych stwierdzana jest w wodach ujmowanych z różnych warstw stratygraficznych, nawet w wysokiej jakości trzeciorzędowych wodach oligocenu. W pracy przedstawiono wyniki badań laboratoryjnych nad zmniejszeniem intensywności barwy, utlenialności i absorbancji w UV (254 nm) w wyniku usuwania kwasów humusowych z wody przeznaczonej do spożycia w procesach utleniania, filtracji, sorpcji i koagulacji. W badaniach zastosowano filtry wypełnione piaskiem kwarcowym, piroluzytem, węglem aktywnym oraz komory reakcji pozwalające na prowadzenie sorpcji na pylistym węglu aktywnym i utleniania ozonem, nadmanganianem potasu oraz promieniami UV (256 nm). Wykazano, że w optymalnych warunkach prowadzenia procesu zmniejszenie intensywności barwy wody podczas filtracji katalitycznej zachodziło w 75%, podczas sorpcji na pylistym węglu aktywnym w 93% i w złożach węglowych w 86%, podczas koagulacji w filtrach kontaktowych w 93%, podczas utleniania nadmanganianem potasu w 91%, utleniania ozonem w 92%, utleniania promieniami UV w 20%, utleniania przy kolejnym dawkowaniu O3 i UV w 78%, UV i O3 w 79% oraz łącznym dawkowaniu UV+O3 w 79%.

EN

The colour of groundwater associated with the presence of humic acids is detected in the water drawn from various stratigraphic layers, even in high-quality Tertiary Oligocene water. The laboratory tests reported on in this paper aimed at reducing the coloured matter content, COD and UV absorbance (254 nm) that are concomitant with the removal of humic acids from potable water via oxidation, filtration, sorption and coagulation. The tests were carried out using filters with high-silica sand, pyrolusite or activated carbon beds, as well as reactors enabling sorption on powdered activated carbon and oxidation with ozone, potassium permanganate, or UV (256 nm) radiation. It has been demonstrated that under optimal process conditions the removal of coloured matter from the water during catalytic filtration totalled to 75%, during sorption on powdered activated carbon 93%, during coagulation in contact filters 93%, during oxidation with potassium permanganate 91%, during oxidation with ozone 92%, during oxidation involving UV radiation 20%, during oxidation with sequential doses of ozone and UV 78%, with sequential doses of UV and ozone 79%, and with combined UV + O3 doses 79%.

2

Usuwanie barwy z wody w procesie sorpcji i koagulacji

Kaleta J.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

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2000

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z. 32[180], cz.2

171-178

EN

The paper presents the research concerning the potential for using powdery clinoptylolites for the sorption of water coloring compounds. The methylene blue solution with concentration 20 mg/dm3 was used as indicative pollutant. In order to remove the adsorbent with sorbed adsorbate, a coagulation process was used with the help of aluminium and iron coagulants. Cationic polyelectrolytes were used as coagulation assisting factor. Coagulation test with polyelectrolites only was also conducted. On the basis of the tests it was found that the optimum dose of clinoptylolite, for which the colour was removed in 99,5 %, was 6 g/dm3. The ferric chloride appeared to be a good coagulant and its optimum dose was 10 mg/dm3. The best colour removal effect were obtained at pH of purified solution within 5.5 - 7. The application of polyelectrolytes as coagulation assisting agents enable obtaining of satisfactory results at a lower dose of the basic coagulant. It was also shown that coagulants may be substituted with cationic polyelectrolytes.

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Water blooms - what causes them?

Eloranta P.

Oceanological Studies

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1998

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Vol. 27, No. 1

15-19

EN

Water blooms are usually connected with cyanoprokaryote or algal mass occurrence, however, some other phenomena may also cause an intensive water colour in lakes. Common and characteristic water bloom is often brought about by mass oc-currence of tree pollens, abundant occurrence of fungal spores or, at deeper water layers, besides algae also some green or red sulphur bacteria. The most characteristic blooming algae belong to cyanoprokaryotes, but this phenomenon can be also caused by other taxa e.g. green algae, euglenophytes and chloromonads.