Impact of irrigation wastewater pH on saturated hydraulic conductivity of acidic, neutral, and alkaline Kaolinitic soils

Ali, Aram ORCID: https://orcid.org/0000-0003-2986-9220 and Bennett, John McL and Marchuk, Alla and Biggs, Andrew (2018) Impact of irrigation wastewater pH on saturated hydraulic conductivity of acidic, neutral, and alkaline Kaolinitic soils. In: National Soil Science Conference 2018, 18-23 Nov 2018, Canberra, Australia.

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Abstract

There is an increasing need to use marginal quality water, including industrial treated wastewater and saline and sodic water for irrigating land in arid and semi-arid regions globally. The use of marginal quality of water potentially increases soil structural degradation, decreasing permeability (Bennett 2012; Shainberg et al. 1981), whereby excess sodium (measured as the sodium adsorption ratio, SAR) can result in both intra- and inter-crystalline swelling leading to eventual dispersion (Dang et al. 2018a; Ezlit et al. 2013). Furthermore, this effect can be enhanced or reduced depending on electrical conductivity (EC) of the irrigation water (Dang et al. 2018b). The effect of SAR and EC on saturated hydraulic conductivity (Ks) was classically studied by Quirk and Schofield (1955), with the body of work since identifying that the Ks reduction due marginal quality water depends on soil clay content and mineralogy, soil organic matter, and the electrolyte composition and concentration (Bennett and Raine 2012). However, the effects of marginal water pH and alkalinity on the extent of Ks reduction are less well understood, especially in relation to a soils initial pH and alkalinity. Naturally formed soils usually have a pH ranging from 4 to 10 (Szabolcs 1989), and the soil pH in a specific soil is basically a function of the soil clay minerals, organic portion, associated ion exchange, and hydrolysis reactions (Sumner et al. 1991). The aim of this study was to investigate the impact of different pH and EC of treatment solutions at SAR 20 and 40 on Ks reduction for Kaolinitic soils with different original pH values, enhancing the current understanding of Australian soils.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Speech)
Refereed: Yes
Item Status: Live Archive
Additional Information: ©Soil Science Society of Australia Inc 2018. No evidence of copyright restrictions preventing deposit of Accepted version.
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Sustainable Agricultural Systems (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Sustainable Agricultural Systems (1 Aug 2018 -)
Date Deposited: 09 Aug 2021 00:27
Last Modified: 09 Aug 2021 00:29
Uncontrolled Keywords: irrigation wastewater, pH, hydraulic conductivity, soils of different pH
Fields of Research (2008): 05 Environmental Sciences > 0503 Soil Sciences > 050305 Soil Physics
05 Environmental Sciences > 0503 Soil Sciences > 050399 Soil Sciences not elsewhere classified
Fields of Research (2020): 41 ENVIRONMENTAL SCIENCES > 4106 Soil sciences > 410605 Soil physics
41 ENVIRONMENTAL SCIENCES > 4106 Soil sciences > 410699 Soil sciences not elsewhere classified
Socio-Economic Objectives (2008): D Environment > 96 Environment > 9614 Soils > 961499 Soils not elsewhere classified
URI: http://eprints.usq.edu.au/id/eprint/43198

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