Košnář Zdeněk, Mercl Filip, Pierdonà Lorenzo, Chane Abraham Demelash, Míchal Pavel, Tlustoš Pavel
Department of Agro-Environmental Chemistry and Plant Nutrition, Czech University of Life Sciences Prague, Kamýcká 129, 165 00, Praha, Suchdol, Czech Republic.
Department of Agro-Environmental Chemistry and Plant Nutrition, Czech University of Life Sciences Prague, Kamýcká 129, 165 00, Praha, Suchdol, Czech Republic.
Environ Pollut. 2023 Sep 15;333:122060. doi: 10.1016/j.envpol.2023.122060. Epub 2023 Jun 15.
Concentration of 16 polycyclic aromatic hydrocarbons (PAHs), 7 polychlorinated biphenyls (PCBs), and 11 organochlorine pesticides (OCPs) in sewage sludge from 40 wastewater treatment plants (WWTPs) was investigated. Relationship between pollutant sludge contents, main WWTP parameters and type of sludge stabilisation was carefully evaluated. Average load of PAHs, PCBs, and OCPs in different sludges from Czech Republic was 3096, 95.7 and 76.1 μg/kg dry weight, respectively. There were moderate/strong correlations among the individual tested pollutants in sludge (r = 0.40-0.76). Relationship between total pollutant contents in sludge, common WWTP parameters and sludge stabilisation was not evident. Only individual pollutants such anthracene and PCB 52 correlated significantly (P < 0.05) with biochemical oxygen demand (r = -0.35) and chemical oxygen demand removal efficiencies (r = -0.35), suggesting recalcitrance to degradation during wastewater treatment. When sorted according to the design capacity, a linear correlation between WWTP size and pollutant contents in sludge was evident with growing WWTP capacity. Our study indicated that WWTPs with anaerobic digestion are prone to accumulate a statistically higher content of PAHs and PCBs (P < 0.05) in digested sludges compared to aerobically digested ones. The influence of anaerobic digestion temperature of treated sludge on tested pollutants was not evident.
对40家污水处理厂（WWTPs）污泥中16种多环芳烃（PAHs）、7种多氯联苯（PCBs）和11种有机氯农药（OCPs）的浓度进行了调查。仔细评估了污染物污泥含量、主要污水处理厂参数与污泥稳定化类型之间的关系。捷克共和国不同污泥中PAHs、PCBs和OCPs的平均负荷分别为3096、95.7和76.1μg/kg干重。污泥中各测试污染物之间存在中度/强相关性（r = 0.40 - 0.76）。污泥中总污染物含量、常见污水处理厂参数与污泥稳定化之间的关系不明显。只有个别污染物如蒽和多氯联苯52与生化需氧量（r = -0.35）和化学需氧量去除效率（r = -0.35）显著相关（P < 0.05），表明在废水处理过程中难降解。按设计能力分类时，随着污水处理厂规模的增大，污水处理厂规模与污泥中污染物含量之间存在明显的线性关系。我们的研究表明，与好氧消化污泥相比，厌氧消化的污水处理厂处理后的污泥中PAHs和PCBs的含量在统计学上更容易积累（P < 0.05）。处理后污泥的厌氧消化温度对测试污染物的影响不明显。
