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This article in JEQ

  1. Vol. 9 No. 4, p. 616-621
    Received: Dec 24, 1979

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Effectiveness of Land Application for Phosphorus Removal from Municipal Waste Water at Manteca, California1

  1. I. K. Iskandar and
  2. J. K. Syers2



The concentrations of dissolved inorganic phosphate (DIP) in soil solution collected at 0.8 and 1.6 m in soils which had received municipal waste water for 4 and 13 years ranged from 7.3 to 13.9 µg P/ml. In some cases, these concentrations were higher than that in the added waste water. Sorption studies Indicated that the ability of soils from the control site to remove added P from solution was low. Waste water addition caused a substantial decrease in the P sorption capacity of surface soils and a marked change in isotherm shape from a curvilinear to an essentially linear isotherm. Sorption capacity generally increased down the profile to 60 cm on the treated sites. Only a small proportion of the total P accumulated from waste water addition was in the organic form. Large amounts of P were extractable by 10−2M CaCl2, particularly in the upper 45 cm of the profiles receiving waste water. Although lack of crop removal of P and a high infiltration rate may be partly responsible for the poor performance of the Manteca system in terms of P removal from waste water, the very low P sorption capacity of the soil is regarded as the major factor.

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