The PCDD/F Removal Efficiency of a Medical Waste Incinerator Dual-Bag Filter System

Abstract

This study investigated the polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) removal efficiencies in two medical waste incinerators (MWIs) -MWI-A and MWI-B, with waste burning capacities of 9.12 and 12 tons per day, with dual-and single-bag filter systems, respectively. The PCDD/Fs in the stack flue gas and fly ashes of each air pollution control device (APCD) unit were collected concurrently. Based on mass balance, it was determined that the major PCDD/F removal occurred in the bag filter system with activated carbon injection (ACI). The total PCDD/F emission removal efficiencies for the whole dual-bag filter system, bag filter 1 (BF1), bag filter 2 (BF2) in MWI-A and the single bag filter system (BF) in MWI-B were 99.7%, 84.8%, 98.0%, 99.0% on the mass basis, respectively. The PCDD/F emission ratio (the escaped PCDD/F ratio after all APCDs) with the dual-bag filter system was over four times lower than that with a single bag filter. The results demonstrate a very efficient way to reduce the excess PCDD/F emissions incurred by intermittent operations and irregular waste feeding.

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

“…Since organic compounds such as polychlorinated biphenyls (PCBs), CBs and dioxins are hydrophobic (Wang et al, 2012;Liao et al, 2014;Chen et al, 2014), flotation technology has been also used to remove these organic compounds from municipal solid waste incinerator (MSWI) fly ash (Cheruiyot et al, 2015;Lee et al, 2016;Cheruiyot et al, 2016). Furthermore, organic pollutant removal and UC removal have good linear relationship during flotation of MSWI fly ash (Huang et al, 2007).…”

Characteristics and Treatment Methods of Medical Waste Incinerator Fly Ash: A Review

“…Table 2 presents the concentrations and (toxic equivalent qualities) TEQs of dioxins in MWIFA and MSWIFA from different incinerators and APCDs. [37,38] SD: semidry scrubber; AC: activated carbon injector; BF: bag filter; SS: Semidry scrubber.…”

Predicting Final PCDD/F Emissions by Coupling Adsorption Model of Activated Carbon and Relationships of PCDD/Fs and Flue Gas Compositions

“…In APCDs, a great deal of previous research has proved that the ACI+BF system is an effective alternative to the removal of PCDD/Fs [20]. For the ACI+BF system, there are several factors which could affect the efficiency of removing PCDD/F emissions [21], including upstream APCDs [22], the gas/particle partition of PCDD/Fs [23,24], characteristic and dosage of the activated carbon [25,26], contact time of the activated carbon and PCDD/Fs [27], and the injection method, among others [28]. According to the actual structure of APCDs [29,30], the question of how to control the operating parameters of the ACI+BF system to satisfy national PCDD/F emission standards is one of most frequently stated problems in the operation of MSWIs.…”