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- W80109761 abstract "Many papers and even books have been written to this title. Worthwhileness in this case will be evidenced by brevity. Moses is presumed to have brought down a moral code of ten paragraphs. What are the ten things of major importance in operating a filter plant? 1. say it write it. Not only directions for operation, but also results of operation. Don't guess. 2. Know the immediate watershed. Resist any tendency to add to pollution of stream. Cooperate with Fish and Game organization. 3. Observe and record physical condition of raw water hourly. Check equipment for feeding coagulant at least hourly. 4. Lighten the load for final chlorination by pre-chlorination when needed. It would seem worth while to prechlorinate all waters showing 50 percent coli findings in 10 cc. quantities prior to final chlorination. This presumes a filter effluent turbidity less than 0.5 p.p.m. While the ability of modern chlorine equipment to give continuous service is much greater than in the early days, it is vital that too great a responsibility be not placed upon a single step in the purification process. 5. Generally a coagulated water that filters clear through coarse paper just after treatment, will settle well and filter clear. Whether it is necessary so to coagulate that bottle samples will settle «clear and sparkling is questionable. It is certain that the turbidity of the settled water should seldom exceed 25 p.p.m. 6. The filter material should show no coarse particles at surface; contain few or no mud balls; and be level when dewatered. A ball of sand from any point below the surface layer should fall apart when released from pressure. Any wash rate that does not freely float the sand layer is inadequate. 7. Effluent turbidities should rarely be higher than 1 p.p.m. The old custom of recording O turbidity on the filtered water is not true." @default.
- W80109761 created "2016-06-24" @default.
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- W80109761 date "1931-01-01" @default.
- W80109761 modified "2023-09-24" @default.
- W80109761 title "Proper Filter Operation and Maintenance" @default.
- W80109761 doi "https://doi.org/10.1002/j.1551-8833.1931.tb17808.x" @default.
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