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The Effect of Ozonation, Coagulation and Adsorption on Natural Organic Matter Removal

Dąbrowska Lidia

Journal of Ecological Engineering

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2021

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Vol. 22, nr 9

216--223

EN

For the treatment of surface water, the coagulation process was used with highly alkaline polyaluminium chloride PAX-XL19F and coagulation supported by ozonation and adsorption on powdered activated carbon CWZ-30 for reducing the level of surface water pollution with organic substances. In addition to the typical indices used to assess the content of organic compounds (total organic carbon TOC, oxidisability OXI, ultraviolet absorbance UV254), the study also evaluated colour, turbidity, and the potential of trihalomethanes formation THM-PF. Reduction in the content of TOC in water after coagulation ranged from 22 to 24%, OXI in the range of 34-36%, and UV254 absorbance from 52-55%. The turbidity and colour of the water was reduced by 70-73% and 56-60%, respectively. The use of preliminary ozonation and activated carbon-assisted coagulation increased the efficiency of water treatment. Changes in the values of TOC, OXI, UV254 absorbance, turbidity and colour were 28-33%, 45-46%, 69-73%, 72-79% and 89-100%, respectively. In the water purified by coagulation and then chlorinated, THM-PF was 37-38% lower than in untreated surface water. The use of additional pre-ozonation and activated carbon during coagulation increased the reduction of THM-PF by 9-12%.

2

Usuwanie prekursorów trihalometanów w procesie koagulacji chlorkami poliglinu

Dąbrowska Lidia

Gaz, Woda i Technika Sanitarna

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2020

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Nr 1

18--21

PL

Celem badań była ocena efektywności procesu koagulacji z wykorzystaniem wysoko zasadowego chlorku poliglinu PAX-XL19F w obniżeniu poziomu zanieczyszczenia wody substancjami organicznymi. W warunkach laboratoryjnych prowadzenia procesu przy użyciu PAX-XL19F obniżenie utlenialności, zawartości OWO i RWO w zależności od miesiąca pobrania wody wynosiło odpowiednio 46-61%, 24-43% i 17-33%, a wartości absorbancji UV254 od 51 do 68%. Potwierdzono przydatność procesu koagulacji do usuwania materii organicznej będącej prekursorem tworzenia trihalometanów. Potencjał tworzenia THM w wodach oczyszczonych był o 39-65% niższy niż w nieczyszczonych wodach powierzchniowych poddawanych chlorowaniu.

EN

The aim of the research was to evaluate the efficiency of the coagulation process using highly alkaline polyaluminium chloride PAX-XL19F in reducing the level of surface water pollution with organic substances. In the laboratory conditions of the process using PAX-XL19F, reductions in oxygen consumption, TOC and DOC contents depending on the month when water was collected were 46–61%, 24–43% and 17–33%, respectively, whereas reduction in UV254 absorbance ranged from 51 to 68%. The study confirmed the usefulness of the coagulation process in the removal of organic matter, which represents a precursor for formation of trihalomethanes. The potential for THMs formation in treated water was by 39–65% lower than in untreated surface water after chlorination.

3

Trihalomethane Formation Potential in the Water Treated by Coagulation

Dąbrowska Lidia

Journal of Ecological Engineering

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2019

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Vol. 20, nr 9

237--244

EN

The aim of the research was to evaluate the effectiveness of the coagulation process using pre-hydrolysed salts, polyaluminium chlorides, in reduction of water pollution with organic substances, including precursors to formation of trihalomethanes (THMs) during water chlorination. Surface water collected from the Stradomka river and from the Adriatyk reservoir located in Częstochowa was used for the research. In addition to typical indices used to assess the content of organic compounds (total and dissolved organic carbon TOC and DOC, oxygen consumption, ultraviolet absorbance UV254), the study also evaluated the potential of THM formation. Under the laboratory conditions of the process using pre-hydrolysed coagulants, reductions in oxygen consumption and TOC contents depending on the month and place when water was collected were 17–42% and 14–38%, respectively, whereas reduction in UV254 absorbance ranged from 39 to 69%. The study confirmed the usefulness of the coagulation process in the removal of organic matter, which represents a precursor for formation of trihalomethanes. The potential for THM formation in treated water was by 28–55% lower than in untreated surface water after chlorination. The concentration of trichloromethane was 78–93% of the total THM content in the chlorinated treated waters. Dissolved organic matter played a major role in CHCl3 formation (76–88%).