Barreira capilar construída com resíduo pré-tratado mecânica e biologicamente

Abstract

O controle da entrada de água de chuva no interior do aterro de resíduos sólidos urbanos durante sua construção e após seu fechamento é crucial para manter o controle da geração de lixiviado. Este fator pode contribuir para a elevação de gastos com tratamento e monitoramento e para a instabilidade mecânica do aterro. Por esta razão, o sistema de cobertura final de um aterro de resíduos sólidos urbanos é decisivo ao controle da entrada de água no mesmo. Na maioria dos casos, o sistema de cobertura final é composto por solo compactado. Frequentemente, um solo adequado para a cobertura não é encontrado nos arredores do aterro; portanto, recursos têm que ser despendidos para o transporte do mesmo até o devido local. Uma alternativa seria a utilização de uma barreira capilar construída com resíduos pré-tratados mecânica e biologicamente. No entanto, o uso deste material para esta construção ainda não foi bem estudado, e as diversas variáveis envolvidas no funcionamento de uma barreira capilar construída com resíduos sólidos pré-tratados mecânica e biologicamente são desconhecidas. O objetivo deste trabalho foi analisar os parâmetros envolvidos no funcionamento de uma barreira capilar construída exclusivamente de resíduos sólidos urbanos pré-tratados mecânica e biologicamente. Observou-se que este utilizado como material de uma barreira capilar pode funcionar de maneira equivalente àquela construída com solo, sendo boa a sua capacidade de retenção da água de chuva.

Development of flume model of inclined capillary barrier (clay silt/CDW) in a subtropical climate scenario

“…The inclined flume model was developed aiming the simulation of a capillary barrier made of soil and CDW under conditions of intense rainfall, which frequently occurs in subtropical regions. The study of the capillary barrier behavior through flume models is an approach that had been being used by many authors ( [7], [11]; [12]; [13]; [14]; [15]), although it is not standardized. It is based in the execution of the layers of a CBS in a box or in specific apparatus, where rainfall events are simulated for measurements of percolated water volume over time.…”

“…An interesting and widespread technique for this type of evaluation, that is, the flow behavior through different layers, are the reduced physical models (flume models). This study approach was adopted by several authors over the years, as [7], [11], [12], [13], [14], [15], among others.…”

“…Almeida [12] and Izzo et al [13], for example, studied a CB cover system produced with solid waste pre-treated mechanically and biologically, both carried out their researches with the flume model technique. Almeida [12] built a box of 20 mm glass plates, dimensions of 0,60 m (width) x 1,96 m (length) x 0,97 m (height); rainfall simulator system made with PVC pipes with drippers; and, three drain points (PVC pipes wrapped in geotextil membrane and gravel), two in each layer foot of the CBS and one for runoff.…”

“…Almeida [12] built a box of 20 mm glass plates, dimensions of 0,60 m (width) x 1,96 m (length) x 0,97 m (height); rainfall simulator system made with PVC pipes with drippers; and, three drain points (PVC pipes wrapped in geotextil membrane and gravel), two in each layer foot of the CBS and one for runoff. Izzo et al [13], on the other hand, built a 0,6 m x 1,80 m x 0,44 m acrylic box; for the rainfall simulator system, sprinklers were employed; and the drains were also made of PVC pipes. Zhan et al [14] analysed a three-layer inclined capillary barrier (with classical materials, silt, sand and gravel, respectively from top to bottom).…”

Effect of Particle Size on the Hydraulic Characteristics of Mechanically and Biologically Treated Waste

“…e relationship between the permeability and the pressure of MBT waste (Table 1) with one particle size has been studied by several researchers [9,18,19]. In addition, the relationship between the permeability and the dry density of MBT waste with one particle size has also been studied [20,21]. In this study, a systematic analysis on the MBT waste (from Hangzhou, China) with different particle size ranges (0-10, 0-20, and 0-40 mm) was carried out using a compression and permeability combined apparatus and a large-scale vertical permeability apparatus.…”