Proposta de tratamento convencional para efluente de lavagem de moagem úmida em uma indústria recicladora de plásticos

Abstract

Intending to facilitate the industrial reuse and/or proper disposal of effluent generated during the wet grinding stage in a plastics recycling industry, this study suggests the implementation of a conventional treatment process, incorporating coagulants. To achieve this objective, laboratory experiments were conducted utilizing two types of coagulants, Tanfloc® and aluminum sulfate, with variations in their concentrations in the solution and sedimentation time. Additionally, an analysis of physical and chemical parameters such as pH, total solids, dissolved solids, total suspended solids, COD, and BOD was performed.Based on the obtained results, the most suitable treatment conditions were identified as employing aluminum sulfate as a coagulant at a concentration of 500 mg/L and a sedimentation time of 20 minutes. Under these specified parameters, subsequent to the coagulation, flocculation, and sedimentation processes, the effluent was successfully adjusted for disposal into the sewage network, meeting acceptable standards for almost all the analyzed parameters, except for BOD. Nevertheless, the treated effluent does not meet the quality requirements for utilization in the company's secondary activities.