Determinação dos metais Al, Cu, Cd, Pb, Zn and Cr, em lodo residual proveniente de efluentes de uma indústria de embalagem de papel reciclado no interior do Paraná

Abstract

Brazil stands out as one of the largest pulp and paper producers in the world. The raw material used comes from cellulosic fibers obtained from trees such as pine and eucalyptus. After the manufacturing process, the paper is placed in commerce and after its consumption is often discarded in landfills, dumps, if this paper does not return to the industrial process. An alternative for this material not disposed in landfills / dumps is recycling. Importantly, almost all types of paper can be recycled (corrugated papers, white papers, kraft, among others), and are called shavings (each paper has a sort of classification). There is an industrial sector that uses paper as a recycled raw material and this industrial follow-up removes tons of papers that would become waste (garbage) from the environment and turn them into other products, mainly to be used in packaging manufacturing. The recycled paper industries use less energy, water and chemicals compared to the pulp and paper industries, but still generate some waste, one of them being the residual sludge resulting from the final treatment stage of the wastewater treatment plant). This residue may contain several types of bioaccumulative metal ions, which in excess can contaminate soil, water often resulting in the imbalance of various ecosystems, intoxicating living beings, etc. Due to the importance of knowing the concentration of these metals, the present work sought to develop an applicable methodology for the determination of some metal that may be present in the ETE residual sludge of a recycled paper industry in the interior of Paraná. The results obtained were significant, staying within the limits established by legislation.