About the Possibility of Recycling Water Treatment Sludge in the Wood–Cement Composites Production

Abstract

The paper presents the results of a study of the possibility of recycling water treatment sludge in the production of wood-cement composites. Sludge is formed during the treatment of sewage, containing industrial machine oil, with a sorption material, based on thermally modified chestnut tree waste (CTW). It was found that the addition of sludge leads to an increase in the density of the samples. Thus, the samples without the addition of sludge have an average density of 860 kg/m3, samples with the addition of sludge in an amount of 10 mass% - 875 kg/m3, 20 mass% - 879 kg/m3, 30 mass% - 882 kg/m3, 42 mass % - 887 kg/m3. Studies of the change in water absorption of samples, depending on the amount of sludge added, showed that the values slightly decrease for samples containing sludge, what is explained by the presence of oil in the mixture. The compressive strength of the samples with the addition of sludge in the amount of 42 mass% was 3.1 MPa, what corresponds to the regulatory requirements for a wood cement composites.

Determination of Compression Stress and Volumetric Weight of Lightened Concrete Blocks, with the Use of Recycled Polymers and Nanoadditives

“…The amount of nanoparticle additive corresponding to each dosage was dissolved in the first part of the water that was separated. According to Sapronova et al [39], concrete mixing needs to be performed for a period of 4 to 5 minutes, verifying that the union of all materials forms a uniform mixture and controlling the amount of water applied since this may vary when placing additives in the concrete mix, causing the block to crumble or crack [35]. Subsequently, the mold was filled in three layers verifying that the concrete disperses completely without leaving empty spaces and is compacted (Fig.…”