Effect of MSW Source-Classified Collection on Polycyclic Aromatic Hydrocarbons in Residues from Full-Scale Incineration in China

Abstract

Municipal solid waste (MSW) sourceclassified collection represents an advancement in resource recycling and secondary pollution control in China. Comparative experiments were performed to assess the effect of a newly-established MSW source-classified collection system on polycyclic aromatic hydrocarbons (PAHs) in bottom ash from an incinerator (BA), fly ash from a boiler (FAB) and fly ash from a bag filter (FABF) of a full-scale MSW incinerator in China. Compared with FAB or FABF, PAHs were mainly concentrated in BA with a range of 1,961.0-2,420.2 μg/kg. Total amounts of 16 high priority PAHs in BA, FAB and FABF from the classified MSW incineration were significantly reduced by 19.0%, 42.4% and 59.8% respectively in comparison with those from the traditional mixed MSW incineration. Moreover, the toxic equivalent quantity (B[a]P eq ) of carcinogenic PAHs in these three kinds of residues from the classified MSW incineration were significantly decreased, with the maximum decrease observed in FABF. As a result of source-classification with effective presorting and dewatering, plastics and metals in the MSW were lower, but combustibles and heat values of the MSW increased. Due to variations of the characteristics of the feed waste, complete combustion conditions including continuous higher incineration temperature, lower CO concentration and higher air excess ratio were observed during the process of classified MSW incineration. Incineration temperature and CO concentration showed a negative and positive correlation, respectively, with total PAHs, indicating that incomplete combustion products such as PAHs could be reduced by controlling combustion conditions directly related to properties of the feed waste. The newly established MSW source-classified collection process could be a feasible method for reducing PAHs formation and emission in residues from MSW incineration.

Levels and patterns of polycyclic aromatic hydrocarbons and polychlorinated biphenyls in municipal waste incinerator bottom ash in Zhejiang province, China

“…Thus a particular attention should be paid to PAHs when bottom ash is reused or landfilled. When compared with other incineration plants, the PAH levels were consistent with those from one MSW plant in Hangzhou, China, with the range of 1961.0-2420.2 g/kg [11]. Compared with the data from other countries (Table 4), total PAH concentrations in this study were in the similar range as those found in Orebro, Sweden (480-3590 g/kg) [8,9], while were higher than those in Roma, Vernaison and London [7,10,27].…”

“…In the described protocol, the surrogate standard was used to quantify 16 target compounds. The operating parameters of the ion trap mass spectrometry (ITMS) system were set as follows: electron impact at 70 eV, scan rate at 0.5 s, RF storage level at 45 u, axial modulation at 4.5 V, ion source temperature at 200 • C, transfer line temperature at 280 • C, manifold temperature at 50 • C, 50 A for the filament emission current, electron multiplier voltage at 1650 kV and resonant mode for collision-induced dissociation (CID) [11,24]. The 16 PAHs considered as primary environmental concern to USEPA were naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, benz [ …”

“…In China, the levels and distributions of PAHs in bottom ash were rarely studied. Shi et al [11] investigated PAH levels (1961.0-2420.2 g/kg) in two bottom ash samples in MSWI of Hangzhou.…”

Performance evaluation of common hazardous waste incinerator for ship scraping waste

“…Incineration process involves conversion of elemental constituents in organic waste to toxic gases and non-toxic gases (4) . Control of combustion conditions alters the composition of the various secondary substances resulting from the incineration process.…”

Seed-induced Hydrothermal Synthesis of Tobermorite from Municipal Solid Waste Incinerator Fly Ash

“…Fly ash, the by-product generated from MSW incineration (Shi et. al., 2008;Shi et al, 2009), also belongs largely to the CaO-CaCl 2 -CaSO 4 -Al 2 O 3 -SiO 2 system, Yao et al (1999) have reported the synthesis of tobermorite from MSW incinerator fly ash by hydrothermal treatment in the presence of NaOH solution at 180°C. Chemical composition analysis sets forth SiO 2 , CaO, and Al 2 O 3 being the major waste-insoluble components of MSW incinerator fly ash, which is hence a suitable starting material for tobermorite synthesis.…”