ÆäÀÌÁö À̹ÌÁö
PDF
ePub

Monthly Averages of Analyses of Effluent of Filler No. 62.

[merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][subsumed][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][subsumed][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][ocr errors][merged small][subsumed][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small]

This continuous filter, 20 inches in diameter, was started Sept. 2, 1893, and contained 24 inches in depth of sand of an effective size of 0.16 millimeter. The sand used in this filter was a white, sharp, pure quartz sand, from Berkshire County, such as is used in the manufacture of glass. The history of the filter during 1895 was published in the annual report of the Board, and the points in connection with the operation of the filter during 1896 which are of special importance are described in the following paragraphs.

After draining, the filter went out of operation Nov. 24, 1895. The surface was spaded 4 inches deep on May 7, 1896, and enough new Berkshire sand added to make the bed of sand 24 inches deep; city water was then applied from below. After the surface became covered the filter was allowed to stand for sixteen hours. Canal water was applied May 8, and the filter put into operation at a rate of 5,000,000 gallons per acre daily. This rate was reduced. to 3,000,000 gallons on June 1. A short trap attached to the outlet prevented air from entering at the bottom.

On account of low water in the canal the outlet of the filter was closed on the following dates for periods varying from two to twentyfour hours: May 16, 22, 23, 30, June 27, July 11, August 9, 11, September 12, 19, 26, October 17, November 7. The gate was

closed for a longer period of sixty-two hours on September 5, 6, 7. During all of these periods the surface remained covered with water.

In order to remove clogging the surface was scraped on the following dates: on May 15, 0.21 of an inch of sand was removed; on May 21, 0.29 of an inch; on May 26, 0.20 of an inch; on June 17, 0.25 of an inch; on June 23, 0.22 of an inch; on June 30, 0.25 of an inch; on July 6, 0.28 of an inch; on July 15, 0.29 of an inch; on July 22, 0.29 of an inch; on July 28, 0.27 of an inch; on August 3, 0.23 of an inch; on August 14, 0.31 of an inch; on August 22, 0.29 of an inch; on August 31, 0.32 of an inch; on September 10, 0.30 of an inch; on September 24, 0.24 of an inch; on October 5, 0.33 of an inch; on October 14, 0.33 of an inch; on October 26, 0.32 of an inch; on November 3, 0.24 of an inch. After scraping, canal water was applied at once, without raking the surface or filling the filter with city water from below.

A bacteriological analysis of the effluent was made on each day excepting Sundays. The number of bacteria per cubic centimeter found in these samples is given in the record of daily analyses in the following table :

Average Daily Number of Bacteria per Cubic Centimeter in Effluent of Filter No.

[merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][subsumed][subsumed][subsumed][subsumed][merged small][ocr errors][ocr errors][merged small][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][merged small][merged small][merged small][merged small][subsumed][merged small][merged small][subsumed][subsumed][subsumed][ocr errors][subsumed][merged small][merged small][merged small][merged small][subsumed][merged small][subsumed][merged small][merged small][subsumed][merged small][subsumed][subsumed][subsumed][merged small][subsumed][subsumed][merged small][merged small][subsumed][merged small][subsumed][merged small][subsumed][merged small][merged small][merged small][merged small][ocr errors][subsumed][subsumed][ocr errors][merged small][subsumed][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small]

Monthly Averages of Analyses of Effluent of Filter No. 63.

[merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][ocr errors][merged small][ocr errors][merged small][merged small][ocr errors][merged small][merged small][ocr errors][merged small][ocr errors][merged small][ocr errors][subsumed][merged small][subsumed][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][subsumed][merged small][merged small][subsumed][merged small][merged small][ocr errors][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][subsumed][subsumed][merged small][subsumed][subsumed][subsumed][merged small][merged small][merged small][merged small]

This continuous filter, 20 inches in diameter, was started Sept. 2, 1895, and contained 12 inches in depth of sand of an effective size of 0.16 millimeter. The sand used in this filter was also a white, sharp, pure quartz sand, from Berkshire County. The history of the filter during 1895 was published in the annual report of the Board, and the points in connection with the operation of the filter during 1896 which are of special importance are described in the following paragraphs.

After draining, the filter went out of operation Nov. 24, 1895. The surface was spaded four inches deep on May 7, 1896, and enough new Berkshire sand added to make the bed of sand 12 inches deep. City water was applied on May 8 and the filter put into operation at a prescribed rate of 5,000,000 gallons per acre daily. The depth of water on the surface at this time was 6 inches. A short trap attached to the outlet prevented air from entering the filter at the bottom. June 1 the rate was reduced to 3,000,000 gallons per acre daily. In order to keep the filter running at the required rate, the surface had to be scraped about once in 5 days from July 8 to July 27.

On account of low water in the canal the gate on the outlet was closed on the following dates for periods varying from two to fortytwo hours: May 16, 22, 23, 30, June 27, July 11, August 9, 11,

September 12, 19, 26, October 17, November 7. The gate was closed for a longer period of sixty-two hours on September 5, 6, 7. During all of these periods the surface remained covered with water.

In order to remove clogging the surface was scraped on the following dates: May 12, 0.26 of an inch of sand was removed; May 15, 0.22 of an inch; May 20, 0.18 of an inch; May 23, 0.23 of an inch; May 27, 0.20 of an inch; June 2, 0.24 of an inch; June 8, 0.23 of an inch; June 15, 0.26 of an inch; June 22, 0.14 of an inch; June 27, 0.19 of an inch; July 3, 0.20 of an inch; July 9, 0.27 of an inch; July 16, 0.24 of an inch; July 22, 0.25 of an inch; July 27, 0.23 of an inch; July 31, 0.23 of an inch; August 5, 0.20 of an inch; August 13, 0.27 of an inch; August 19, 0.27 of an inch; August 26, 0.30 of an inch; September 1, 0.21 of an inch; September 9, 0.25 of an inch; September 16, 0.30 of an inch; September 24, 0.24 of an inch; October 3, 0.24 of an inch; October 9, 0.23 of an inch; October 15, 0.24 of an inch; October 21, 0.22 of an inch; October 27, 0.23 of an inch; November 2, 0.23 of an inch. After scraping, the surface was not raked, and canal water was applied at once, without filling with city water from below.

A bacteriological analysis was made of a sample of effluent on each day excepting Sundays. The number of bacteria per cubic centimeter found in these samples is given in the record of daily analyses in the following table:

[ocr errors]

Average Daily Number of Bacteria per Cubic Centimeter in Effluent of Filter No 64, 1896.

[merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small]

No. 34.]

Average Daily Number of Bacteria per Cubic Centimeter in Effluent of Filter No. 64, 1896-Concluded.

[merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][subsumed][merged small][merged small][ocr errors][merged small][merged small][ocr errors][merged small][merged small][ocr errors][subsumed][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][subsumed][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][subsumed][merged small][merged small][subsumed][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors]
[blocks in formation]

Monthly Averages of Analyses of Effluent of Filler No. 64.

[Parts per 100,000.]

Water.

Applied.

Effluent.

[merged small][merged small][subsumed][merged small][merged small][subsumed][merged small][merged small][merged small][merged small][ocr errors][merged small][ocr errors][merged small][ocr errors][subsumed][ocr errors][subsumed][merged small][merged small][subsumed][subsumed][merged small][ocr errors][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][ocr errors][ocr errors][ocr errors][merged small][merged small][merged small][merged small][subsumed]

Color.

[blocks in formation]

.29.0018 .0115

.0023.0125

.18.0014.0096

.20.0017.0084

.0021.0108

.43.0023 .0150

.52.0058 .0174

[merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small]

.27

.38

[ocr errors]

71

49

[ocr errors]

131

[ocr errors][merged small][merged small][merged small][merged small][merged small]

.32.0025.0122

[blocks in formation]
« ÀÌÀü°è¼Ó »