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DBPs removal in GAC filter-adsorber
1Kwater Academy, Kwater (Korea Water Resources Corporation), Daejeon 305-730, Republic of Korea. kjinkeun@kwater.or.kr
Water Research
|August 21, 2007
Summary
Granular activated carbon filter-adsorbers (GAC FA) showed higher removal of dissolved organic carbon (DOC) and disinfection by-products (DBPs) than sand filters. Biodegradation significantly improved removal of five haloacetic acids (HAA(5)) over time.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Adsorption and Biodegradation
Background:
- High ammonia and dissolved organic carbon (DOC) in raw water lead to increased disinfection by-products (DBPs) due to pre-chlorination.
- Conventional rapid sand filters may not adequately remove both DOC and DBPs simultaneously.
Purpose of the Study:
- To compare the efficacy of a rapid sand filter and a granular activated carbon filter-adsorber (GAC FA) in removing DOC and DBPs.
- To evaluate the performance of a retrofitted GAC FA at the Buyeo WTP in Korea.
Main Methods:
- Comparative analysis of rapid sand filter and GAC FA performance.
- Monitoring of dissolved organic carbon (DOC) and disinfection by-products (DBPs) removal efficiencies.
- Investigation of breakthrough and biodegradation phenomena in GAC FA.
Main Results:
- GAC FA demonstrated higher overall removal efficiency for DOC and DBPs compared to the sand filter.
- Trihalomethane (THM) removal by GAC FA showed breakthrough after 3 months.
- Five haloacetic acids (HAA(5)) removal initially decreased but later improved (>90%) due to biodegradation, influenced by water temperature.
Conclusions:
- GAC FA is more effective than sand filters for simultaneous DOC and DBP removal.
- Biodegradation plays a crucial role in long-term HAA(5) removal by GAC FA.
- Sand filters may offer superior manganese removal, while GAC FA excels in DBP and DOC reduction.
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