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Evaluation of spray irrigation for on-site wastewater treatment and disposal on marginal soils

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Two field sites with soil limitations (shallow depth to restrictive layers) were used in the evaluation of slow rate spray irrigation as an alternative methodology to conventional on-site wastewater treatment are disposal. Secondary treatment and disinfection of the effluent was performed before application to the soil-plant system at rates of 1.25 and 2.5 cm/wk. After 20 months of effluent application at Site 1 and 12 months of application at Site 2, adequate wastewater renovation was occurring at both sites. Nitrogen removal rates by the soil-plant system were between 85% and 95%, with NO3 -N concentrations in shallow groundwaters at both field sites less than 0.8 mg/L. Phosphorus removal rates were at least 96%. Storm water runoff quality measurements from Site 1 indicated no serious threat to nearby surface waters. Small increases in soil NO3 -N and NH4 +-N concentrations to the 30-cm depth occurred only at Site 2. There was no evidence of increased soil PO4-P concentrations as a result of wastewater irrigation. The soil moisture content increased slightly at depths measured from 30 to 150 cm during summer months at both sites. Both sites demonstrated that the renovation capacity of on-site spray irrigation systems in soils with limitations can be very efficient.
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Keywords: DOMESTIC EFFLUENT; NITROGEN; ON-SITE DISPOSAL; PHOSPHORUS; SOILS; SPRAY IRRIGATION

Document Type: Research Article

Publication date: 1996-01-01

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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