The contents of operating
Treatment of municipal water supplies.

Pretreatment equipment that can safely and inexpensively treat large volumes.

In lakes, dams, rivers and streams that are the source of raw water used in public water supplies, eutrophication is increasing due to the introduction of municipal and industrial wastewater. Conventional aeration, coagulation, and sedimentation, sand filtration, activated carbon processes are unable to adequately address the problem. Lately there has been a remarkable increase of CODs in the in fluent, especially humic materials, also because the application of chlorine in the first and second chlorination steps increases trihalomethane, eliminating BOD and COD contaminants, algae, SS and ammonia products during pretreatment is becoming an important factor. The effectiveness of pretreatment of water for municipal water supplies greatly influences equipment cost, operating expense, and the removal of parasite like cryptosporidium, trihalomethane, and offensive odors and taste and has a decisive effect on the supply of safe, delicious, and inexpensive water. With high-density bio-film filtration three conventional processes can be accomplished in one step. Not only does this have the benefit of minimizing chemical reaction processes, it can easily be accomplished by modifying existing sand filtration systems.
Because large volumes can be treated safely and inexpensively it is the ultimate pretreatment for municipal water supplies.

As a pretreatment device the Daiwa Ace emphasizes the removal of BOD,COD,ammonia,algae,and SS. Activated carbon is used to assure safety.
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