Carbonaceous adsorbents from sewage sludge and their application in a combined activated sludge-powdered activated carbon (AS-PAC) treatment

Microwave-induced drying, pyrolysis and gasification (MWDPG) of sewage sludge: Vitrification of the solid residue

“…Moreover, their best results were obtained by chemical activation with acids. Other authors also claim to have produced activated carbons (with a very poor pore textural development) by chemical activation of sewage sludge with acids [9,11]. However, due to the presence of heavy metals in the sewage sludge (Table 4), using acids to activate it may lead to an acid, which is highly contaminated with the metals and the various organic substances present in the sludge.…”

“…The pyrolysis of different wastes in order to obtain carbonaceous adsorbents from the solid fraction has been the subject of a number of studies [9][10][11]. However, all these adsorbents have much inferior characteristics to the commercial ones [9][10][11] (also derived from relatively cheap raw materials).…”

“…However, all these adsorbents have much inferior characteristics to the commercial ones [9][10][11] (also derived from relatively cheap raw materials). In the particular case of using sewage sludge as raw material to produce adsorbents, an additional problem is leaching, which may occur when a material that contains www.elsevier.com/locate/jaap J. Anal.…”

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

“…Bioregeneration can hardly be a way of avoiding deterioration of the adsorbent quality (Ivancev-Tumbas et al 1998). Problems related to desorption of microbial products and filling of pores with decay products of microbial cells are also reported in several other investigations (Sirotkin et al 2002;Martin et al 2004). Zhao et al (1999) attributed the loss of adsorption capacity of a BAC fluidized bed reactor that treated toluene-contaminated water to the irreversible adsorption of soluble microbial products, rather than to the adsorption of toluene that is highly reversible.…”

Treatment of azo dye Orange II in a sequential anaerobic and aerobic-sequencing batch ractor system

“…The potential superiority of powdered activated carbon-enhanced activated sludge system over a conventional activated sludge system has been demonstrated in many pilot and full-scale test treatments (Sublette et al 1982;Martin et al 2004). The Biological Activated Carbon-process is more effective than the consecutive adsorption and biodegradaion treatment.…”