Adsorption of Pollutants from Liquid Swine Manure Through the Application of Metabasalt Rock Powder

Abstract

Adequate animal manure disposal became a challenge in agriculture. Liquid swine waste (LSW), easily used in agriculture, presents disadvantages due to the high volume and low nutrient concentrations. Metabasalt powder, a residue of amethyst mining, was evaluated as an adsorbent agent of nutrients (Cu, Zn, P, and K) from LSW. Seven doses of metabasalt powder were tested in proportion with LSW (0, 4, 10, 20, 40, 80, and 160 kg m −3 ), and during four contact times (CT) (9, 21, 42, and 84 days) and ions were dosed in the liquid and solid fractions. Copper and phosphorus concentrations in the liquid fraction were lower at 21 days of contact. The lowest concentration of zinc in the liquid fraction was observed at the dose of 10 kg m −3 of metabasalt powder, and at 9 days of CT. The K concentrations in the liquid fraction diminished linearly with the metabasalt doses, in which the major dose presented 51% of K compared to the control. The application of metabasalt as an adsorbent agent reduced the contaminant charge in the liquid fraction of LSW, suggesting safe water disposal while promoting ion accumulation in the solid fraction. The use of metabasalt powder became a useful strategy to make LSW pre-treatment on-farm.

Nutrient transfer in rangelands under rock powder amendment

“…In line with this modification, the use of rock powder (named remineralizer in Brazilian law) as a soil amendment is increasing (Anda et al., 2015; Korchagin et al., 2019; Manning, 2018; Manning and Theodoro, 2020; Ramos et al., 2015; Ramos et al., 2021 ; Silva et al., 2012; Tonello et al., 2021). In addition, there are several possible uses for silicate rock, such as fertilization, a fixing agent, and for global carbon reduction (Perdoncini et al., 2022 ; Ramos et al., 2022). Positive effects of rock powders have been reported on perennial species (Dalmora et al., 2020; Tonello et al., 2021) and annual species (Ramos et al., 2015, 2021).…”