Journal Title
Title of Journal: Water Air Soil Pollut
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Abbravation: Water, Air, & Soil Pollution
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Publisher
Springer Netherlands
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Authors: Runbin Duan Clifford B Fedler Christopher D Sheppard
Publish Date: 2010/05/07
Volume: 215, Issue: 1-4, Pages: 43-54
Abstract
Wastewater land application is a costeffective method to treat and dispose wastewater however it may cause soil salinization Salt mass balance and the potential soil salinization caused by the wastewater land application were investigated in the crop root zone in a wastewater land application system at the City of Littlefield TX USA from October 7 2005 to September 28 2007 using a lysimeter system This study showed that after 2 years of wastewater land application the ranges of soil salinity were still lower than the threshold 8500 μS/cm for Bermuda grass assuming a 10 yield reduction The leached salt mass showed large spatial and temporal variation The average values of electrical conductivity of the saturated paste extract of the soil samples increased from 1433 μS/cm in June 2006 to 1840 μS/cm in June 2007 The average values of the soil sodium adsorption ratio between June 2006 and June 2007 increased from 11 to 14 resulting in a potential risk of soil dispersion and decreasing the soil infiltration rate Although the measured leaching fractions in nearly all sampling periods except one were higher than the leaching requirement salt accumulations in the root zone were still found with only two exceptions Since the time required for reaching equilibrium between cumulative salt mass input and cumulative salt mass output varies from 1 year to a few years or even longer the longterm investigation is recommended for the study of salt mass balance in the root zone of this wastewater land application systemWe thank Texas Onsite Wastewater Treatment Research Council of the Texas Commission on Environmental Quality Austin TX USA for providing the funding support We also thank the staff of the wastewater treatment plant and officials with the City of Littlefield TX USA for the help land and facility used to conduct this research
Keywords:
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