PHOTODECOMPOSITION OF PCBS ABSORBED ON SEDIMENT AND INDUSTRIAL-WASTE - IMPLICATIONS FOR PHOTOCATALYTIC TREATMENT OF CONTAMINATED SOLIDS

被引:19
作者
CHIARENZELLI, J
SCRUDATO, R
WUNDERLICH, M
RAFFERTY, D
JENSEN, K
OENGA, G
ROBERTS, R
PAGANO, J
机构
[1] Environmental Research Center, SUNY @ Oswego, Oswego, NY 13126
关键词
D O I
10.1016/0045-6535(95)00174-7
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
PCBs in contaminated sediment and soil have been photodegraded in slurry suspension with TiO2 and simulated solar illumination without pre-treatment or amendments. Degradation of 81% of the PCBs in St. Lawrence River sediment was achieved in a 24 h irradiation period. Replicate experiments using five times as much sediment and half the light intensity yielded similar results. The observed degradation rates of individual PCB congeners correspond with gas chromatograph retention time and chlorine number. Lesser and ortho chlorinated PCBs are preferentially photodecomposed. The solubility of individual congeners controls the observed rate of decomposition by regulation of the transfer of PCBs to the aqueous phase and thus effectively retards access to the catalyst (anatase). The rate and degree of photodegradation can be enhanced by the use of lower wavelength ultraviolet light which leads to hydroxylation of PCB congeners increasing solubility and accessibility to photocatalytic reactions. Photodecomposition of PCBs in a slurry composed of furnace ash, core sands, and aluminum-rich (>45% Al2O3) slag from an aluminum foundry was increased from 45 to 88% during a 24 h irradiation period by using low wattage UVC lamps instead of solar equivalent illumination.
引用
收藏
页码:3259 / 3272
页数:14
相关论文
共 19 条
[1]   BIOCHEMICAL AND PHOTOCHEMICAL PROCESSES IN THE DEGRADATION OF CHLORINATED BIPHENYLS [J].
BAXTER, RM ;
SUTHERLAND, DA .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1984, 18 (08) :608-610
[2]  
BENNETT P, 1994, AM LAB, P29
[3]   HENRY LAW CONSTANTS FOR POLYCHLORINATED-BIPHENYLS - EXPERIMENTAL-DETERMINATION AND STRUCTURE PROPERTY RELATIONSHIPS [J].
BRUNNER, S ;
HORNUNG, E ;
SANTL, H ;
WOLFF, E ;
PIRINGER, OG ;
ALTSCHUH, J ;
BRUGGEMANN, R .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1990, 24 (11) :1751-1754
[4]   PHOTO-DECHLORINATION OF PCBS IN PRESENCE OF TITANIUM-DIOXIDE IN AQUEOUS SUSPENSIONS [J].
CAREY, JH ;
LAWRENCE, J ;
TOSINE, HM .
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY, 1976, 16 (06) :697-701
[5]  
CHIARENZELLI J, 1994, UNPUB
[6]   PHOTOCATALYTIC DEGRADATION OF SIMULATED PESTICIDE RINSATES IN WATER AND WATER PLUS SOIL MATRICES [J].
CHIARENZELLI, JR ;
SCRUDATO, RJ ;
RAFFERTY, DE ;
WUNDERLICH, ML ;
ROBERTS, RN ;
PAGANO, JJ ;
YATES, M .
CHEMOSPHERE, 1995, 30 (01) :173-185
[7]   SOLUBILIZATION OF POLYCYCLIC AROMATIC-HYDROCARBONS IN MICELLAR NONIONIC SURFACTANT SOLUTIONS [J].
EDWARDS, DA ;
LUTHY, RG ;
LIU, ZB .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1991, 25 (01) :127-133
[8]   PHOTODECHLORINATION OF CHLOROBIPHENYLS BY SODIUM METHYL SILICONATE [J].
HAWARI, J ;
TRONCZYNSKI, J ;
DEMETER, A ;
SAMSON, R ;
MOURATO, D .
CHEMOSPHERE, 1991, 22 (1-2) :189-199
[9]   ACETONE-INDUCED PHOTODECHLORINATION OF AROCLOR 1254 IN ALKALINE 2-PROPANOL - PROBING THE MECHANISM BY THERMOLYSIS IN THE PRESENCE OF DI-TERT-BUTYL PEROXIDE [J].
HAWARI, J ;
DEMETER, A ;
GREER, C ;
SAMSON, R .
CHEMOSPHERE, 1991, 22 (12) :1161-1174
[10]  
HONG C, 1994, COMMUNICATION