Removal of phenol by activated alumina bed in pulsed high-voltage electric field

Technologies for the removal of phenol from fluid streams: A short review of recent developments

“…On the other hand also the coupling of adsorption on alumina with electrical discharges [141] as well as of adsorption on ACs and polymeric materials with sonication [130] have been reported as very efficient methods to remove phenol. In a recent study the coupling of activated sludge treatment with photocatalysis in phenol destruction has been investigated [142].…”

Efficient removal of phenol from aqueous solution by the pulsed high-voltage discharge process in the presence of H2O2

“…• OH and H2O2 thus formed, then reacts with phenol in water c ausing its degradation (Zhu et al, 2007). The • OH radical reac ts with phenol (C6H5OH) and form hydroxycyclohexadienyl ra dical • C6H5(OH)2 as given by reaction 5 (Sun et al, 2000;Shen et al, 2008).…”

“…Also, addition of ferrous ion and hydrogen peroxide increases the degradation of phenol. Zhu et al (2007) showed improved removal of phenol by activating alumina bed placed in pulsed high voltage electrical field. The removal rate of phenol was 72.1% when the air was bubbled through the solution, and increased to 88.2% when 0.05 mm/L ferrous ions were added.…”

“…PHVD technology has been used in wastewater treatment for the efficient removal of organic compounds, particularly with high toxicity and low biodegradability; such as for removal of phenol, chlorophenols, organic dye (Sun et al, 2000;Sugiarto and Sato, 2001). A little work has been carried out on PHVD technology in combination with other techniques to achieve more better results, such as ferrous ion, hydrogen peroxide, activated alumina, titanium dioxide and gas bubbling along with various other methods are also used for de-pollution (Bian et al, 2008;Bilal et al, 2014;Gong et al, 2008;Jamal et al, 2015;Li et al, 2007;Manzoor et al, 2013;Sugiarto et al, 2003;Shen et al, Qureshi et al, 2015;Ullah et al, 2013;Zhu et al, 2007). Sugiarto et al (2003) reported that the addition of a small amount of hydrogen peroxide and oxygen gas bubbling greatly improved the degradation rate of phenol.…”

4-chlorophenol degradation by pulsed high voltage discharge coupling internal electrolysis

“…The removal of methyl orange and the COD was 84 and 39% respectively by pulsed discharge treatment, while they were 96.3 and 68.6% respectively by the combination of pulsed discharge and GAC [13]. Zhu et al investigated the removal of phenol by activated alumina bed in pulsed high voltage electric field and showed that local discharge occurred at the surface of activated alumina promoted phenol degradation in the thin water film [14]. As a kind of photo-catalysts, TiO 2 was introduced into high voltage discharge system to promote organic pollutants' decomposition [15][16][17].…”