Klimm C, Schramm K W, Henkelmann B, Martens D, Kettrup A
GSF-National Research Center for Environment and Health, Institute of Ecological Chemistry, Neuherberg, Germany.
Chemosphere. 1998 Oct-Nov;37(9-12):2003-11. doi: 10.1016/s0045-6535(98)00264-1.
Octa- and heptachlorodibenzo-p-dioxins (OCDD and HpCDD) were formed during semi anaerobic digestion of sewage sludge at low temperature (20 degrees C). A twofold increase of OCDD and HpCDD was found after a digestion period of 192 days even if concentrations were corrected by corresponding accumulation factors caused by the degradation of biomass. Other polychlorinated dibenzo-p-dioxins and furans (PCDD/F) and polychlorinated biphenyls (PCB) were not increased. Under strictly anaerobic and aerobic conditions, however, no OCDD and HpCDD were formed. Semi anaerobic formation of OCDD and HpCDD may explain the prevalence of higher chlorinated PCDD in the homologues pattern typical for sewage sludge.
八氯和七氯二苯并 - 对 - 二噁英（OCDD和HpCDD）是在低温（20摄氏度）下污水污泥的半厌氧消化过程中形成的。即使通过生物质降解引起的相应积累因子对浓度进行校正，在192天的消化期后，仍发现OCDD和HpCDD增加了两倍。其他多氯二苯并 - 对 - 二噁英和呋喃（PCDD/F）以及多氯联苯（PCB）并未增加。然而，在严格的厌氧和好氧条件下，未形成OCDD和HpCDD。OCDD和HpCDD的半厌氧形成可能解释了污水污泥典型同系物模式中高氯代PCDD的普遍存在。
