Organophilic clays for the successful stabilisation/solidification of problematic industrial wastes

Use of admixtures in organic-contaminated cement–clay pastes

“…Moreover, it was suggested that adverse effects of organic contaminants could be overcome by the use of pre-solidification adsorbent materials, like activated carbons and organophilic clays [11]. Unfortunately, just a few experimental studies, aimed at demonstrating the effectiveness of the organophilic clays as pre-adsorbents in the cement-based S/S technology, can be found in the literature since the 1990s [7][8][12][13][14][15][16].…”

“…Then, in this work we used three different commercial admixtures, which should have reduced the porosity of the matrix (a rubber latex and a superplasticizer) or repels water (waterproofing agent) to improve the performance of cement pastes admixed with organophilic clays and organic pollutants. To our knowledge, few studies have been addressing the use of organic admixtures in cement-based S/S technology, for instance a couple of interesting applications of rubber latex in the immobilization of heavy metal ions into a cement paste [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. A recent issue of this journal (vol.…”

Effects of organoclays on soil eubacterial community assessed by molecular approaches

“…While the use of different types of organoclay as adsorbents for organic pollutants is well known [23][24][25], few studies have been performed regarding the influence of organoclays on the growth and activity of microorganisms in soil [26]. Several authors [26,27] have reported that cationic surfactants are toxic for many bacteria, in particular, Nye et al [26] of cationic surfactants on bacteria occurring in soils treated with QACs.…”

Leaching behaviour of low level organic pollutants contained in cement-based materials: Experimental methodology and modelling approach

“…The major part concern polycyclic aromatic hydrocarbons (PAH) and phenol compounds [2][3][4][5][6][7][8] but also organic waste and/or polluted soils containing high organic content, particularly PAH [9][10][11][12][13]. The used binders are mixtures of cements with specific adsorbents: clays and modified clays, activated carbon [13][14][15][16]. The OM reduces s/s performances: influences on cement hydration/hardened process and structural Subscripts exp experimental s surface sat saturation 0 initial state consequences on the formed materials depend on the content and characteristics of the organic species (e.g.…”