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Influence of biochar thermal regeneration on sulfamethoxazole and dissolved organic matter adsorption
Ist Teil von
Environmental science water research & technology, 2018-02, Vol.4 (2), p.169-174
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2018
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Biochar is emerging as a cost-effective, environmentally-sustainable adsorbent for removing organic contaminants (OC) from wastewater, stormwater, and drinking water, but strategies for managing exhausted biochar are needed. Here, pine biochar generated at 850 °C was exhausted by background dissolved organic matter isolated from surface water [dissolved organic carbon ∼4.2 mg L
−1
, UV-absorbance at 254 nm (UVA
254
) ∼0.10 cm
−1
] and sulfamethoxazole (SMX) [∼200 ng L
−1
], in a column. Exhausted biochar underwent a semi-oxic-thermal-regeneration step at 600 °C (
i.e.
, heat treatment). SMX and UVA
254
adsorption capacity and breakthrough were evaluated in rapid small-scale column tests (RSSCTs). Relative to fresh biochar, heat treated biochar that had been exhausted exhibited ∼3.5-fold and ∼3-fold greater SMX and UVA
254
adsorption capacities, respectively, and ∼3-fold increase in adsorption efficiency (
i.e.
, mass loss-adjusted SMX adsorption capacity). When applying the heat treatment to fresh biochar, a similar improvement in adsorption capacity was observed. Adsorption capacity and BET surface area were positively correlated and continued to increase after a second exhaustion–regeneration cycle, but the adsorption efficiency remained the same due to mass loss. SMX breakthrough correlated with that of UVA
254
, which provides the basis for a rapid, inexpensive method to predict OC breakthrough. Heat-treated biochar's SMX adsorption capacity was ∼20% of activated carbon's. Greater empty-bed-contact times increased the SMX adsorption capacity of heat-treated biochar. These results suggest that thermal regeneration could enhance the economic and environmental sustainability of biochar sorbents.