Role of the physico-chemical factors in the purification process of water from surface-active matter by biosorption

Drinking Water: Factors Affecting the Quality of Drinking Water

“…It is known that the efficiency of biosorption of organic matter on activated carbon (AC) depends on the value of changes of Gibb's free energy of adsorption (− ΔG°a) with the idea that the higher this value the smaller the contribution of the biodestructive component and vise versa [130]. This relationship is related to solubility of the organic compounds for example to its hydrophilic nature since hydrophilic compounds biodegrade easier and is less effectively sorbed on the AC hydrophobic surface.…”

Microbial regeneration of spent activated carbon dispersed with organic contaminants: mechanism, efficiency, and kinetic models

“…Such apparent irreversibility is commonly referred to as hysterisis or nonsingularity (Aktas and Cecen 2007b). Klimenko et al (2002) suggested that the difference in the Gibbs free energy between the molecules in the bulk solution (−ΔG bulk°) and the adsorbed molecules inside the porous structure (−ΔG ads°) is the driving force for bioregeneration.…”

The influence of activated carbon surface properties on the adsorption of the herbicide molinate and the bio-regeneration of the adsorbent

“…However, Castro et al [27] reported that mixed culture DC is able to treat rice paddies waters, reducing molinate concentrations ranging from 0.5 to 0.01 mg l −1 to values within the legally recommended limits (<2 g l −1 ) [28]. At least part of the amount of molinate remaining adsorbed onto the activated carbons may occupy the micropores, becoming unavailable for desorption and, thus, biodegradation, as described by Klimenko et al [5] for other adsorbents. In fact, activated carbon Chemviron, which was unable to be bio-regenerated by mixed culture DC [9, present work], has almost the double of the micropores volume and less than half of the mesopores specific surface area of the activated carbons Norit, meaning that the most interesting activated carbons for this application are those with larger pores, consisting mainly of meso and macropores.…”

“…[3][4][5][6]. Another procedure involves two stages of treatment: first the pollutant is removed and concentrated by adsorption and then bio-regenerated through the utilization of microorganisms able to degrade the pollutant [7][8][9].…”