Abstract
The usage of sewage sludge in agriculture can increase the levels of heavy metals in the soil, compromising their use as fertilizer. The objective of this study was to evaluate the contamination of soil and pineapple by heavy metals after the application of treated sewage sludge by different forms in three orders of soils under greenhouse conditions. The treatments, in a factorial scheme 7 × 3 were distributed in a randomized complete block design with three replications, corresponding to seven fertilization management: soil without fertilization, chemical fertilization, fertilization with composted sludge sewage, fertilization with vermicompost sewage sludge, fertilization with solarized sewage sludge, fertilization as sewage sludge dried in a Bruthus-Albrecht rotary sludge dryer and fertilization with limed sludge sewage, combined with three orders of soils: Cambisol, Nitisol and Acrisol. The Zn, Cu, Cr, Pb, Ba, Cd, Ni, As and Se contents were analyzed in the soil, in the leaf of greater length (D leaf) and in the fruit pulp of the pineapple. The Acrisol provided more favorable conditions to the increase in the availability and absorption of Pb and As by D leaf and fruit of the pineapple. Fertilization with composted, vermicompost and solarized sewage sludge provided high levels of Pb, As, Zn in leaf D and in the pineapple fruit, relating the interference of sludge stabilization process with the absorption of metals by pineapple fruits.
Highlights
The agricultural usage of sewage sludge or products from its stabilization is an important alternative for the reduction in production costs and to the increase of the productivity of several crops, since this residue promotes physical and chemical improvements of the soil due to its high levels of nutrients and organic matter (Nascimento et al, 2004; Lemainski & Silva, 2006; Zuba Junio et al, 2012; Ribeirinho et al, 2012).Nitrogen is the most important plant nutrient in the sewage sludge
Concentrations of Ba, Cd, Ni and Se in the sewage sludge were below the levels of detection or quantification by the analytical methods used
Zn, Cu, Cr, Pb and As were quantified (Table 2), they were below the maximum concentrations allowed in sewage sludge or sludge products established by CONAMA Resolution no. 375 (Brasil, 2006)
Summary
The agricultural usage of sewage sludge or products from its stabilization is an important alternative for the reduction in production costs and to the increase of the productivity of several crops, since this residue promotes physical and chemical improvements of the soil due to its high levels of nutrients and organic matter (Nascimento et al, 2004; Lemainski & Silva, 2006; Zuba Junio et al, 2012; Ribeirinho et al, 2012).Nitrogen is the most important plant nutrient in the sewage sludge. The application of sewage sludge based on nitrogen concentration, complemented with phosphorus and potassium, seems to be the best management for this fertilizer use (Tontti et al, 2017). In this context, the pineapple presents a high demand for N (Caetano et al, 2013; Cardoso et al, 2013) and sludge can replace it, which is an important fertilizer economy for the crop besides providing an adequate destination of the organic residue (Mota et al, 2018)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
