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Purification of Secondary Effluent in a Natural Sand Filter

Donald B. Aulenbach, Robert R. Harris and Robert C. Reach
Journal (Water Pollution Control Federation)
Vol. 50, No. 1 (Jan., 1978), pp. 86-94
Stable URL: http://www.jstor.org/stable/25039509
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Purification of Secondary Effluent in a Natural Sand Filter
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Abstract

Studies were made of the degree of treatment of secondary effluent applied to a natural delta sand bed by a rapid infiltration system. Measurements were made of temperature, dissolved oxygen, pH, total dissolved solids, redox potential, chloride, ammonia, Kjeldahl and nitrate nitrogen, ortho and total phosphorus, calcium, magnesium, alkalinity, iron, sodium, potassium, and copper. The soluble constituents moved through the sand with little or no change in concentration. The depth of sand required for removal of different constituents was variable. Nitrate was reduced to less than 1 mg N/l in the top 8 m. Total nitrogen required approximately 18 m for significant removal. Satisfactory removal of orthophosphate was achieved in the top 10 m. The approximately 20 m of sand in North Sand Bed 11 of the Lake George Village Sewage Treatment Plant is adequate to prevent nutrient contamination of the groundwaters.

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