Aluminium and manganese leaching and retention in two contrasting soils treated with aluminium-based sludge water in a column experiment

Dube, Sinikiwe; Muchaonyerwa, Pardon; Mapanda, F.; Hughes, J. C.

doi:10.1080/02571862.2021.1969693

Cited by 1 publication

(4 citation statements)

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“…The sandy loam, however, did not leach Mn from the sludgewater treatment as much as the clay. Although Dube et al (2022) found that Mn was leached from the clay in diluted sludgewater treatments, the presence of plants in the present study appears to have reduced this Mn leaching as it was only significantly higher than the control in the undiluted sludgewater treatments. Manganese oxidation/reduction in clay soils is delicately balanced and relatively small changes in pH or temperature can tip the relationship in either direction (Sparrow & Uren, 2014) and may have caused the variable Mn leaching towards the end of the experiment in the sludgewater treatments on the clay.…”

Section: Discussioncontrasting

confidence: 82%

“…(2022). In brief, the Mn (35 mg L −1 ), Al (2059 mg L −1 ), boron (B; 9.23 mg L −1 ), and Fe (53 mg L −1 ) in the sludgewater were above the minimum standards recommended for irrigation use or disposal without treatment (Dube et al., 2022). The clay was obtained from Harare while the sandy loam soil was collected from Marondera as described in Dube et al (2018).…”

Section: Methodsmentioning

confidence: 99%

“…The characteristics of the sludgewater and the soils (sandy loam and clay) used in this study are given in Dube et al (2022). In brief, the Mn (35 mg L −1 ), Al (2059 mg L −1 ), boron (B; 9.23 mg L −1 ), and Fe (53 mg L −1 ) in the sludgewater were above the minimum standards recommended for irrigation use or disposal without treatment (Dube et al, 2022). The clay was obtained from Harare while the sandy loam soil was collected from Marondera as described in Dube et al (2018).…”

Section: Sludge Water and Soil Characteristicsmentioning

confidence: 99%

“…However, potential leaching was not studied. A follow up study with soil columns without plants indicated that addition of the undiluted sludgewater resulted in a decrease in soil pH and an increase in Mn leaching (Dube et al., 2022). These results suggest that the sludgewater could result in soil acidification and Mn leaching.…”

Section: Introductionmentioning

confidence: 99%

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Leachate characteristics, dry matter yield of Urochloa decumbens and properties of two contrasting soils irrigated with sludgewater in columns

Dube

Muchaonyerwa

Mapanda

et al. 2023

Environmental Quality Mgmt

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Increasing demands on freshwater and challenges in disposal of wastewaters encourage their use for irrigation. The study evaluated the effects of irrigation of signal grass (Urochloa decumbens) with sludgewater on leaching, uptake and retention of a range of elements in two contrasting soils in columns. The grass was grown on a sandy loam and a clay soil packed in plastic columns and irrigated for 119 days with either undiluted, diluted sludgewater or tap water. The sludgewater had a pH of 6.9 and high aluminum (Al), manganese (Mn), iron (Fe), and boron (B). Analyses were conducted on leachates, above-ground plant biomass (two harvests), and soils at the end of the experiment.Sludgewater treatments increased grass biomass yield and uptake of nitrogen (N), phosphorus (P), potassium (K), and magnesium (Mg) in both soils with a greater nutrient uptake from the clay than the sandy loam. The application of sludgewater increased Mn and reduced P (sandy loam only) in the leachate with no effects on Al, Fe, or B. Uptake of Al, Fe, and B was increased by sludgewater application. Even when diluted, the sludgewater increased extractable Mn, particularly in the clay soil. The findings showed that irrigation of the soils with sludgewater increased Mn and B concentrations and uptake by signal grass, with no negative effects on biomass production. Leaching and accumulation in the soils of toxic elements were minimal in the short term. Sludgewater can therefore be used to grow signal grass in both soils although these effects need to be evaluated under field conditions.

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Section: Discussioncontrasting

confidence: 82%