Experimental study on co-pyrolysis characteristics of typical medical waste compositions

Abstract

Thermal decomposition of 21 kinds of binary mixtures between typical medical compositions was investigated under nitrogen conditions by dynamic thermogravimetric analysis (TGA) at 25–800 °C. The weighed sum method (WSM) coupled with thermal analysis was applied to study the interaction between components. Then, co-pyrolysis kinetic model of the binary mixtures (tube for transfusion (TFT) and gauze) was established to verify the reliability of conclusions. The results show the follows. 1) Strong or weak interactions are shown between binary mixtures containing polyvinyl chloride (PVC), the main ingredient of TFT. The addition of other medical waste could enhance first stage decomposition of TFT. While, the secondary stage pyrolysis may be suppressed or enhanced or not affected by the addition. 2) There exists no interaction between catheter and other component, the DTG peak temperature representing CaCO₃ decomposition in catheter fraction is obviously lower than that of pure catheter; while, the shape of DTG peak keeps unchanged. 3) No evident reaction occurs between the other mix-samples, it is considered that their co-pyrolysis characteristics are linear superposition of mono-component pyrolysis characteristics.

Keywords

co-pyrolysis / medical waste / tube for transfusion (TFT) / catheter / interaction

References

[1] JangY C. Infectious/medical/hospital waste: General characteristics [J]. Encyclopedia of Environmental Health, 2011227-231

[2] LiuH-q, WeiG-x, ZhangRui. Removal of carbon constituents from hospital solid waste incinerator fly ash by column flotation [J]. Waste Management, 2013, 33(1): 168-174

[3] PatwaryM A, O’hareW T, SarkerM H. Assessment of occupational and environmental safety associated with medical waste disposal in developing countries: A qualitative approach [J]. Safety Science, 2011, 49(8/9): 1200-1207

[4] OmarD, NazliS N, KaruppannanS A/L. Clinical waste management in district hospitals of tumpat, batu pahat and taiping [J]. Procedia-Social and Behavioral Sciences, 2012, 68(19): 134-145

[5] State Statistics Bureau, Ministry of Environmental Protection.China statistical yearbook on environment-2011 [M], 2011, Beijing, China Statistics Press: 85

[6] XieR, LiW-j, LiJ, WuB-l, YiJ-qiang. Emissions investigation for a novel medical waste incinerator [J]. Journal of Hazardous Materials, 2009, 166(1): 365-371

[7] MoreiraA M M, GüntherW M R. Assessment of medical waste management at a primary health-care center in São Paulo, Brazil [J]. Waste Management, 2013, 33(1): 162-167

[8] KomilisD, FoukiA, PapadopoulosD. Hazardous medical waste generation rates of different categories of health-care facilities [J]. Waste Management, 2012, 32(7): 1434-1441

[9] ChenY, ZhaoR-z, XueJ, LiJ-hui. Generation and distribution of PAHs in the process of medical waste incineration [J]. Waste Management, 2013, 33(5): 1165-1173

[10] AnastasiadouK, ChristopoulosK, MousiosE. Gidarakos E Solidification/stabilization of fly and bottom ash from medical waste incineration facility [J]. Journal of Hazardous Materials, 2012, 207/208(15): 165-170

[11] YanJ-h, ZhuH-m, JiangX-g, ChiY, CenK-fa. Analysis of volatile species kinetics during typical medical waste materials pyrolysis using a distributed activation energy model [J]. Journal of Hazardous Materials, 2009, 162(2/3): 646-651

[12] DengN, ZhangY-f, WangYan. Thermogravimetric analysis and kinetic study on pyrolysis of representative medical waste composition [J]. Waste Management, 2008, 28(9): 1572-1580

[13] ZhuH-m, YanJ-h, JiangX-g, LaiY-E, CenK-fa. Study on pyrolysis of typical medical waste materials by using TG-FTIR analysis [J]. Journal of Hazardous Materials, 2008, 153(1/2): 670-676

[14] ZevenhovenR, AxelsenE P, HupaM. Pyrolysis of waste-derived fuel mixtures containing PVC [J]. Fuel, 2002, 81(4): 507-510

[15] KaminskyW, KimJ S. Pyrolysis of mixed plastics into aromatics [J]. Journal of Analytical and Applied Pyrolysis, 1999, 51(1/2): 127-134

[16] HorikamaS, TakaiY, UkeiH, AzumaN, UenoA. Chlorine gas recovery from polyvinyl chloride [J]. Journal of Analytical and Applied Pyrolysis, 1999, 51(1/2): 167-179

[17] OhS C, KwonW T, KimS R. Dehydrochlorination characteristics of waste PVC wires by thermal decomposition [J]. Journal of Industrial and Engineering Chemistry, 2009, 15(3): 438-441

[18] LópezA, De MarcoI, CaballeroB M, LaresgoitiM F, AdradosA. Dechlorination of fuels in pyrolysis of PVC containing plastic wastes [J]. Fuel Processing Technology, 2011, 92(2): 253-260

[19] SørumL, GrønliM G, HustadJ E. Pyrolysis characteristics and kinetics of municipal solid wastes [J]. Fuel, 2001, 80(9): 1217-1227

[20] KuramochiH, NakajimaD, GotoS, SugitaK, WuW, KawamotoK. HCl emission during co-pyrolysis of demolition wood with a small amount of PVC film and the effect of wood constituents on HCl emission reduction [J]. Fuel, 2008, 87(13/14): 3155-3157

[21] DengNaPyrolysis characteristic and kinetic model of medical waste [D], 2005, Tianjin, Tianjin University

[22] HeikkinenJ M, HordijkJ C, De JongW, SpliethoffH. Thermogravimetry as a tool to classify waste components to be used for energy generation [J]. Journal of Analytical and Applied Pyrolysis, 2004, 71(2): 883-900

[23] MirandaR, PakdelH, RoyC, VasileC. Vacuum pyrolysis of commingled plastics containing PVC II: Product analysis [J]. Polymer Degradation and Stability, 2001, 73(1): 47-67

[24] SeideltS, Müller-HagedornM, BockhornH. Description of tire pyrolysis by thermal degradation behavior of main components [J]. Journal Analytical and Applied Pyrolysis, 2006, 75(1): 11-18

[25] LinJ-p, ChangC-y, WuC-hsiung. Pyrolysis kinetics of rubber mixtures [J]. Journal of Hazardous Materials, 1998, 58(1/2/3): 227-236

[26] DengN, ZhangY-f, NiuB-l, SunY-x, ChenJing. Thermogravimetric study and kinetic model on pyrolysis of medical waste compositions [J]. Acta Scientiae Circumstantiae, 2005, 25(11): 1484-1490