Mar . 28, 2024 09:51 Back to list
Assuring Purity of Drinking Water
PAC can achieve relatively high (greater than 50% for some waters) removal of bulk TOC for some source waters and enhances the removal of TOC through enhanced coagulation Graham et al. (2000).
PAC can be used by water treatment plants on either a full time basis or as needed for taste and odor control or removal of NOM and organic chemicals. PAC can be started and stopped quickly and easily as conditions require. For example, a PAC system could be operated in standby until a taste and odor event in a raw water supply occurs.
PAC can also be easily incorporated into existing infrastructure.
Possible disadvantages of PAC include:
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Use of PAC may increase coagulant dose.
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PAC will increase sludge production significantly, which results in proportional increases in drying and disposal costs.
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PAC that is not settled out will enter the filters and could increase particle counts, head loss, and oxidant demand.
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Adding PAC will require storage and feed facilities and increase operator labor.
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Because of these negative impacts and as it is ineffective at removing hydrophilic micropollutants, PAC is not recommended as a primary treatment approach for controlling organics. However, PAC may be a viable solution, and should be investigated further, for seasonal control of taste and odor events in the water supply.
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