Possible effects of irrigation with wastewater on the clay mineralogy of some Australian clayey soils: laboratory study

Marchuk, Serhiy and Churchman, Jock and Rengasamy, Pichu (2016) Possible effects of irrigation with wastewater on the clay mineralogy of some Australian clayey soils: laboratory study. Soil Research, 54 (7). pp. 857-868. ISSN 1838-675X

Abstract

Potassium is common in a wide variety of wastewaters and in some wastewaters is present at several hundred to several thousand mg L–1. Potassium is taken up by expandable clays leading to its fixation and illitisation of smectitic and vermiculitic layers. Hence the addition of wastewaters to soils may lead to mineralogical changes in the soils that affect their physico-chemical properties.

Winery wastewater was equilibrated with clay-rich soils from Southern Australia. X-ray diffraction patterns and chemical composition of clays extracted from untreated and treated soils were determined. In three of the four soils, shifts in peak positions occurred towards more illitic components along with increases in K and sometimes also Mg and Na contents of soil clays. Peak decomposition showed trends towards the formation of interstratifications of illite with smectite at the expense of smectite and an alteration of poorly crystallised illite into its more well-ordered forms. The results show that illitisation may occur as a result of the addition of K-rich wastewaters to clayey soils.


Statistics for USQ ePrint 35375
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Institute for Agriculture and the Environment
Date Deposited: 14 Jan 2019 01:44
Last Modified: 14 Jan 2019 03:32
Uncontrolled Keywords: decomposition of XRD, potassium, soil clay
Fields of Research : 05 Environmental Sciences > 0503 Soil Sciences > 050304 Soil Chemistry (excl. Carbon Sequestration Science)
Identification Number or DOI: 10.1071/SR14373
URI: http://eprints.usq.edu.au/id/eprint/35375

Actions (login required)

View Item Archive Repository Staff Only