Evolution of biodegradation of deinking by-products used as alternative cover material

Abstract

Deinking by-products (DBP) have been used as alternative cover material for landfills and mine tailings. Since DBP is biodegradable because of its high cellulose and hemicellulose content, a laboratory experimental program was performed to monitor the evolution of biodegradation and changes in the physico-chemical and geotechnical properties of DBP samples submitted to accelerated biodegradation for 1460 days at 38 degrees C. The evolution of gas and leachate production was monitored in terms of both quality and quantity, which allowed for the calculation of mass loss with time. Under the conditions of the tests (no load applied), 19.6% of the mass was lost as gas, whereas 6.1% was leached out. The results show that biodegradation did not significantly alter the compaction behavior of DBP. The void ratio and water content increased significantly, while the volume of the samples slightly decreased. This seem to indicate that the porous structure of the samples was no longer the same after 1460 d of accelerated biodegradation. A slight increase in the relative density indicates that the organic/inorganic matter ratio increased. The results of permeability tests performed with samples at various stages of biodegradation and at various confining stresses show that the saturated hydraulic conductivity of recompacted biodegraded DBP decreased from 7 x 10(-7)cm/s to approximately 2 x 10(-7)cm/s, as biodegradation advanced.

Assessment of the Design of an Experimental Cover with Capillary Barrier Effect Using 4 Years of Field Data

“…According to the Quebec landfilling regulation, REIMR (Gouvernement du Québec 2009), the seepage control layer must have a saturated hydraulic conductivity of B1.0 E-7 m/s (1.0E-5 cm/s) and a minimum thickness of 0.45 m after compaction. In order to take into account settlement and potential mass loss due to biodegradation (Teixeira 2001;Bédard 2005;Panarotto et al 2005;Aït-Benichou et al 2008), a thickness of 0.60-m was adopted for the DBP layer ). Post-construction monitoring indicated that the actual thickness was 0.63 m.…”

Investigation and modeling of odors release from membrane holes on daily overlay in a landfill and its impact on landfill odor control

“…Covering with traditional materials will occupy the storage capacity of the landfill and reduce its space for landfill waste. The use of non-traditional materials, namely waste, as covering materials can effectively improve this problem, so it has become a research hotspot in recent years (Narani et al 2020;Ait-Benichou et al 2008;Solan et al 2010). However, the instability of non-traditional materials and the odor reduction effect still need to be verified.…”

Evaluation of the odour reduction potential of alternative cover materials at a commercial landfill

“…This problem can be overcome if the material being used to perform as a daily landfill cover is sourced from within the waste stream, reducing the landfill void space occupied by virgin soils (Querio and Lundell, 1992) or non waste material. In recent years, much research has been done into finding alternative daily cover (ADC) material, now that traditional materials such as topsoil are not as readily available (Ait-Benichou et al, 2008;Carson, 1992;Querio and Lundell, 1992).…”