In this work, biodegradation of organic pollutants by activated sludge (AS) in the presence of glucose (2 g/L) as an additional carbon source was studied. The AS (without pre-acclimation) was freely suspended under aerobic conditions. Three organic dyes representative of the Algerian textile industry were selected: Cibanon Navy (CN), Solophenyl Scarlet (SS) and Cibacron Green (CG). The results showed that after 10 days of incubation, AS displayed good biodegradation capabilities achieving removal percentages ranging from 50.3% to 89.4% and reduction in COD ranging from 93.1% to 98.3%. Particularly, the textile dye CN was removed up to 89% with high reduction in COD (94.7%). The microbial development stimulated by glucose achieved therefore efficiently the discoloration of contaminated solutions and pollutant degradation. Although it is assumed that dyes can be degraded only under anaerobic conditions, the wastewater treatment using AS appears therefore suitable to the removal of different types of textile dyes before final discharge. Manuscript profile

Some studies asserted that some aquatic plants can remove organic pollutants by degrading them into their biomass. In this work, it was aimed to examine the ability of L. gibba L. to remove two dyes, DR-89 and VB-20 and then to elucidate the mechanism of removal. For this purpose, experiments were conducted at 21±1 °C, 12h photoperiod and pH of 6.1± 0.01. For the maximal dye concentration tolerated by the plants (50 mg L-1), the results demonstrated that maximum dye abatement was determined to be about 53% (VB-20) and 23% (DR-89). In order to identify the mechanism of dye absorption, FT-IR, UV-vis and SEM analyses were conducted on the biomass and liquid phases. The results indicated that alcohol, alkene, phenol, and amine functions are involved in dye binding to the biomass surface without demonstrating any phytodegradation phenomenon. Additionally, the SEM analysis confirmed this result showing that the ventral lobe and the thin root of each frond (unlike the dorsal lobe) are colored via a direct interaction with the dye molecules allowing their absorption from the surrounding water. Thus, the invasive plant, L. gibba L. could remove organic dyes from contaminated mediums by accumulating them in the biomass without degrading them. Manuscript profile