College of Life and Environmental Science, Minzu University of China, Beijing 100081, China.
Key Laboratory of Ecology and Environment in Minority Areas (Minzu University of China), National Ethnic Affairs Commission, Beijing 100081, China.
Int J Environ Res Public Health. 2022 Oct 7;19(19):12860. doi: 10.3390/ijerph191912860.
To evaluate the impact of the first cement kiln co-processing municipal wastes in northwest China on the surrounding environment, the concentrations of polychlorinated naphthalenes (PCNs), polychlorinated biphenyls (PCBs), and polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) were determined in 17 soil samples collected around the plant. The concentration ranges of PCNs, PCBs, and PCDD/Fs were 132-1288, 10.8-59.5, and 2.50-5.95 pg/g, and the ranges of toxic equivalents (TEQ) were 1.98-20.8, 2.36-48.0, and 73.2-418 fg/g, respectively. The concentrations of PCNs, PCBs, and PCDD/Fs in this study were generally lower than those in soil around municipal waste incinerators and industrial parks in other areas. An exponential function equation was applied for the relationship between the concentration of the target compounds and the distance from the cement kiln stack, the results showed that PCN and PCB concentrations declined with the increasing of distance from the stack. Furthermore, it was found that the effect of the cement kiln on surrounding soil contaminations with PCNs and PCBs was stronger than that of PCDD/Fs by comparing the PCN, PCB, and PCDD/F homologue profiles in the fly ash sample from the plant and soil samples at different distances. The total carcinogenic risks (CR) of PCNs, PCBs, and PCDD/Fs for children and adults in soil were 1.65 × 10-8.93 × 10 and 1.70 × 10-9.16 × 10, respectively, which was less than the risk threshold (CR = 1 × 10), and there was no health risk.
为了评估中国西北地区第一座水泥厂协同处理城市废物对周围环境的影响，在工厂周围采集了 17 个土壤样本，检测了多氯萘（PCNs）、多氯联苯（PCBs）和多氯二苯并对二恶英和呋喃（PCDD/Fs）的浓度。PCNs、PCBs 和 PCDD/Fs 的浓度范围分别为 132-1288、10.8-59.5 和 2.50-5.95 pg/g，毒性当量（TEQ）范围分别为 1.98-20.8、2.36-48.0 和 73.2-418 fg/g。本研究中 PCNs、PCBs 和 PCDD/Fs 的浓度通常低于其他地区城市垃圾焚烧厂和工业园区周围土壤中的浓度。目标化合物的浓度与距离水泥厂烟囱的关系采用指数函数方程表示，结果表明 PCN 和 PCB 浓度随距离烟囱的增加而降低。此外，通过比较工厂飞灰样品和不同距离土壤样品中 PCN、PCB 和 PCDD/F 同系物的分布，发现水泥厂对周围土壤中 PCNs 和 PCBs 的污染影响强于 PCDD/Fs。儿童和成人土壤中 PCNs、PCBs 和 PCDD/Fs 的总致癌风险（CR）分别为 1.65×10-8.93×10 和 1.70×10-9.16×10，低于风险阈值（CR=1×10），不存在健康风险。
