Long-term effect of composted tannery sludge on soil chemical and biological parameters

Abstract

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Changes in the bacterial rare biosphere after permanent application of composted tannery sludge in a tropical soil

“…The sludge generated during the tanning process, the tannery sludge (TS), represents one of the primary solid wastes generated by industries. TS is composed of organic and inorganic compounds, including a high concentration of chromium (Cr) (Araujo et al, 2020), which brings environmental concerns regarding its application in the soil (Silva et al, 2010). For instance, the application of tannery sludge has increased soil salinity (Teixeira et al, 2006) and metal contamination (Juel et al, 2021).…”

“…Composting is a biological process of decomposing organic wastes, occurring mostly under thermophilic conditions, to eliminate pathogens and stabilise the waste (Petruccioli et al, 2011). In addition, this process is effective in biodegrading and recycling organic compounds present in the wastes (Ayilara et al, 2020), being applied to recycle many types of organic wastes, such as cattle manure, sewage sludge, and even industrial wastes (Araujo et al, 2020;Moretti et al, 2015). During the last ten years, composting has been used to recycle TS before its application in the soil as organic fertiliser (Santos et al, 2011;Araujo et al, 2020).…”

“…In addition, this process is effective in biodegrading and recycling organic compounds present in the wastes (Ayilara et al, 2020), being applied to recycle many types of organic wastes, such as cattle manure, sewage sludge, and even industrial wastes (Araujo et al, 2020;Moretti et al, 2015). During the last ten years, composting has been used to recycle TS before its application in the soil as organic fertiliser (Santos et al, 2011;Araujo et al, 2020). Interestingly, applying composted tannery sludge (CTS) increased soil fertility, including organic matter content, and promoted higher plant growth (Sousa et al, 2017).…”

Temporal Stability of Soil Microbial Properties in Responses to Long-Term Application of Compost Obtained from Tannery Sludge

“…Tannery sludge is a solid waste generated by tanning industries that has been recommended to be applied in soils. Its successive application causes modification in the soil properties, mainly increasing soil pH, organic C, and chromium (Cr) content [1][2][3]. On the one hand, the increase in organic C improves soil properties, e.g., promoting better soil structuration, particle size, aeration, soil fertility and health [4].…”

“…Regarding the effect of successive application of tannery sludge on soil microbial properties, more attention has been placed on soil microbial biomass [1], while no attention is paid to the effect of tannery sludge on temporal stability of soil microbial properties. The temporal stability of microbial properties is an important measurement for understanding context-specific responses of soil microbes to any disturbances [7], and greater temporal stability of microbial properties indicates higher soil functionality and resilience [8].…”