The effect of water temperature on the removal of 2-methylisoborneol and geosmin by preloaded granular activated carbon

An Experimental Method for Predicting the Adsorption of Trace Organic Contaminants in Partially Saturated Granular Activated Carbon

“…Hence, it is reasonable to expect that the data points obtained from a pilot-scale test at temperatures lower than those of the laboratory tests (April 2016 at plant F and April 2017 at plant G) would deviate from the model-predicted line while data points obtained at higher temperatures (August 2016 at plant F and November 2015 at plant G) would have closer agreement with model predictions, as shown in Figure . Our previous work has also shown that the temperature had the greatest impact on the external film mass transfer coefficient ( k f ) while having a relatively insignificant impact on adsorption thermodynamics (i.e., equilibrium adsorption capacity) for MIB and geosmin under the realistic conditions with the water temperature varying from 4 to 20 °C . The breakthrough for MIB and geosmin increased as the temperature decreased from 20 °C to the lower temperatures.…”

“…Our previous work has also shown that the temperature had the greatest impact on the external film mass transfer coefficient (k f ) while having a relatively insignificant impact on adsorption thermodynamics (i.e., equilibrium adsorption capacity) for MIB and geosmin under the realistic conditions with the water temperature varying from 4 to 20 °C. 37 The breakthrough for MIB and geosmin increased as the temperature decreased from 20 °C to the lower temperatures. This is consistent with the results in this study.…”

Micropollutant Mass Transfer Zones in Granular Activated Carbon Contactors

“…Thus, although the bottom GAC is less affected by small size NOM and shows a greater MIB/ gesomin equilibrium adsorption capacity (as shown in Figure 4), a lower MIB/geosmin adsorption rate in the bottom GAC would lead to a lower overall MIB/geosmin removal because the adsorption efficiency of the two compounds has been found to be mainly controlled by adsorption kinetics. 3,30 This may explain the lower adsorption kinetic parameter values observed in the bottom GAC (Figure S7). Later, due to the low adsorption energy required, 29 more small size NOM could deposit on the previously adsorbed small size NOM on the top GAC to increase the NOM fouling layer thickness and subsequently decrease the MIB/geosmin film diffusion rate (i.e., adsorption kinetics).…”

Cycling system for decomposition of gaseous benzene by hydrogen peroxide with naturally Fe-containing activated carbon

“…The main characteristic peak at 3550-3200 cm À1 corresponds to the hydroxyl (O-H) stretching group, which may be related to the hydrogen bonding from adsorbed water molecules, alcohol, or phenol compounds. 15,20,21 In particular, the FT-IR proles of the samples treated with the H 2 O 2 solutions showed the characteristic peak corresponding to the O]C]O group at $2349 cm. [22][23][24] Compared to the sample treated with the low-concentration H 2 O 2 solution, the characteristic peak at 3550-3200 cm À1 in the prole of the activated carbon sample treated with the high-concentration H 2 O 2 solution indicates relatively increased hydrophilicity of the activated carbon because of the hydroxyl (O-H) group.…”

“…[25][26][27] Even though the activated carbon sample treated with the highconcentration H 2 O 2 solution has higher surface area than lowconcentration H 2 O 2 solution, the benzene adsorption capacity of the activated carbon sample treated with high-concentration H 2 O 2 was reduced because of the increased hydrophilicity of catalyst. 20,21,27 Fig. 9 shows the XPS C 1s and Fe 2p spectra of the activated carbon samples before and aer treatment with DI water and H 2 O 2 solutions.…”