Determination of optimum dose of adsorbent for PCDD/F removal in the flue gas of a medical waste incineration plant

A Novel Activated Carbon Injection Method to Enhance PCDD/Fs Removal Efficiency in Flue Gas From a Medical Waste Incinerator in Shanghai, China

“…Similar results were reported by Abad et al (2003) and Everaert et al (2003). Gunes et al (2015) reported that the optimum ACI rate for PCDD/Fs was 66 mg/m 3 with removal efficiency was 97% and no significant difference in efficiency was observed at ACI rate of 197 mg/m 3 . Some studies have reported the use of a double-bag activated carbon adsorption process on the basis of the traditional ACI process with a single bag for the removal of PCDD/Fs in a medical waste incinerator system (Kim et al, 2007;Mckay, 2002;Chen et al, 2014;Lin et al, 2008).…”

“…Traditional ACI process injects activated carbon continuously for cleaning the flue gas (Abad et al, 2003;Gunes et al, 2015). Since the activated carbon adsorption process is carried out at high temperature and humidity, and at a wide concentration range of dioxins in the flue gas, the equilibrium adsorption capacity and contact time is limited by the thermodynamics.…”

“…Another issue is the reliability of results on dioxins formation based on laboratory studies, which depends on the use of model compounds (Debecker et al, 2011). Several factors influence the removal efficiency of ACI and bag filter system, including gas/particle partitioning of PCDD/Fs Tejima et al, 1996), injection rate (Gunes et al, 2015), contact time of activated carbon and PCDD/Fs (Karademir et al, 2004), gas/particle partitioning (Karademir et al, 2004), and injection method among others. Tejima et al (1996) reported that the removal efficiency of PCDD/Fs could reach over 99% with activated carbon dosage of 50-100 mg/m 3 .…”

“…Additionally, dioxins are extremely persistent with an estimated half-life of 7-11 years in humans (Schecter et al, 2006). Currently, activated carbon injection (ACI) in combination with bag filter has been found to be an effective alternative to the conventional process for the removal of vapor-phase dioxins at low concentrations in the flue gas from waste incinerator (Abad et al, 2003;Gunes et al, 2015;Chi et al, 2008). However, the low attainment rate of the PCDD/Fs discharge from medical waste incineration flue gas in the whole country indicates that the traditional ACI is far less efficient to meet the national requirement 0.5 TEQ ng/m 3 (MEP, 2001).…”

Effects of Surfactants on the Removal of Carbonaceous Matter and Dioxins from Weathered Incineration Fly Ash

“…When the chlorine content exceeded the threshold (0.8%-.1%), the rate of PCDF formation also exceeded that of PCDDs (Wang et al, 2003). In addition, the higher PCDF concentrations than the PCDD concentrations suggested that de-novo synthesis reactions were the primary mechanism of dioxin formation at the plant (Gunes et al, 2015).…”