Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6973902 | Process Safety and Environmental Protection | 2018 | 30 Pages |
Abstract
This work investigated physic-chemical pre-treatments aimed at improving anaerobic digestion (AD) of cosmetic industrial waste produced by a plant belonging to L'Oréal Group. A mixture designed according to relative abundances of waste was considered: sludge from internal wastewater treatment plant (54%-wt), residues of shampoo/conditioner (31%-wt), mascara sludge (13%-wt), food waste (2%-wt). The mixture had 80% VS/TS and COD equal to 1240 mg O2/gVS; soluble fraction of COD was 22%. Investigated pre-treatments were: chemical, thermal, sonication and various combinations; their performances were assessed through the disintegration rate (DR, the increment of soluble COD due to the pre-treatment compared to the unaltered sample). Best results were achieved from TA - thermo-alkaline (120 min at 50 °C) with DR 64.4% and TAS - thermo-alkaline-sonication (15 min at 80 °C and 40 kHz) with DR 66.1%. The benefits of AD on pre-treated waste mixture were: 50% increase in methane yield (0.14 Nm3/kgVS) and 5-7%-wt reduction of waste amount. From technical, energy and economic viewpoints, the proposed technical solution can provide an interesting perspective, fully consistent with Circular Economy principles.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Health and Safety
Authors
Francesca Demichelis, Silvia Fiore, Maurizio Onofrio,