Browsing by Author "Lee, Tinlai"

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Operation of fixed-bed bioreactor for polluted surface water treatment
(2007)
Lee, Tinlai
;
Huang, Chihpin
;
You, Hueysong
;
Pan, Jill R.
;
環境工程研究所
Dissolved organic matters and ammonia nitrogen are serious contaminants of surface water in Taiwan. These contaminants can interfere with the water treatment process and cause biological instability in the finished water. One solution is to employ a biological treatment stage prior to the conventional water treatment process. A continuous flow biological filter packed with reticulated PU foam was used to remove ammonia nitrogen and organic materials before the conventional water treatment practice. The effect of its operation mode, namely, empty bed contact time (EBCT) and backwash, on the removal efficiencies of ammonia and organic matter was examined. The results suggested that ammonia nitrogen and organic nitrogen can be effectively removed by controlling the operation mode of the biological fixed bed. Efficient ammonia nitrogen removal was achieved upon the combination of the backwash mode with short EBCT or extended EBCT without the backwash. Efficient organic nitrogen and DOC removals were observed at short EBCT without the backwash. This study provides insights into the function of biofiltration, which benefits the design of a fixed-bed bioreactor for the treatment of polluted surface water.
Operational performance of sludge blanket in clarification: effect of organic matter
(2007-05-01)
Huang, Chihpin
;
Lee, Tinlai
;
Pan, Jill R.
;
Hon, Jaiwai
;
環境工程研究所
Sludge blanket clarifiers (SBC) are presently an important unit of the water treatment process in Taiwan. Most studies concerning SBC have revolved around the treatment efficiency on turbidities. In Taiwan most of the raw water sources for water treatment plants are contaminated with organic substances, which often interfere with the operation Of SBC. in this study, the effects of organic materials on the formation of the sludge blanket and its were examined. Humic acid and salicylic acid were added in water to simulate natural waters polluted with organic materials of high and low molecular weights. The addition of humic acid accelerated the formation of a stable sludge blanket, however, the sludge blanket so formed contained less solid. Opposite effects were discovered with salicylic acid. Nevertheless, both organics enhanced the efficiency of turbidity removal by SBC. Large organic molecules were easily removed by SBC. Coagulant addition had no significant effect on turbidity removal although the formation time for a sludge blanket was shortened. To successfully operate SBC, the occurrence and types of organic materials must be monitored.