摘要
环境中的药品和个人护理产品(Pharmaceuticals and Personal Care Products,PPCPs)通过污水处理厂在污水和污泥中蓄积,从而进入生态系统,对生态环境和人类健康造成危害.以卡马西平(CBZ)和布洛芬(IBU)两种典型的PPCPs作为目标污染物,调查其在污水处理厂中的归趋;并以纳米Fe_(3)O_(4)和纳米高岭土作为添加剂(Nano-Fe和Nano-KL处理),研究脱水污泥好氧堆肥过程中两种PPCPs的降解特征及其主要影响因子.结果表明,污水处理厂中CBZ和IBU的平均进水浓度分别为962.5和8869.0 ng·L^(-1),出水浓度分别为107.6和283.4 ng·L^(-1),去除率分别为88.8%和96.8%,CBZ和IBU在脱水污泥中的富集率分别为59.1%和60.5%,因此,有必要对脱水污泥进行无害化处理.与对照相比,Nano-Fe和Nano-KL处理分别可以有效减少54.1%和45.3%的NH3累积排放量及50.8%和38.9%的N_(2)O累积排放量.堆肥结束后,Nano-Fe和Nano-KL处理中CBZ的降解率分别达到85.9%和88.8%,IBU的降解率分别达到80.8%和86.4%;与不添加添加剂的处理相比,两种纳米材料可提高43.7%~53.1%的PPCPs降解.相关性分析表明,堆肥过程中CBZ和IBU的降解与含水率呈显著负相关,与O_(2)和TOC含量呈显著正相关,且相关性系数均大于0.90(p<0.05).以上结果表明,添加Fe_(3)O_(4)纳米颗粒和高岭土纳米颗粒可有效减少堆肥过程的氮素损失,并促进PPCPs的降解,这一发现可为降低污泥土地利用的环境风险提供数据支撑和技术指导.
Pharmaceuticals and personal care products(PPCPs)had accumulated in wastewater and sewage sludge after the treatment of wastewater treatment plants,which could enter into the ecosystems and harm to the ecological environment and human health.In the present study,carbamazepine(CBZ)and ibuprofen(IBU),two typical PPCPs,were used as target pollutants to investigate their fates in wastewater treatment plants.In addition,the effects of nano-Fe_(3)O_(4) and nano-kaolin(Nano-Fe and Nano-KL treatments)on the degradation characteristics of two PPCPs and their main influencing factors during sewage sludge were conducted.Results showed that the mean concentrations of CBZ and IBU in the influent of the wastewater treatment plants were 962.5 and 8869.0 ng·L^(-1),and in the effluent were 107.6 and 283.4 ng·L^(-1),with the removal rates of 88.8%and 96.8%,respectively.However,the enrichment rates of CBZ and IBU in dehydrated sludge were 59.1%and 60.5%,respectively.Therefore,it is necessary to conduct harmless treatment of dehydrated sludge.Compared with the control,the additions of nano-Fe_(3)O_(4) and nano-kaolin reduce the cumulative NH_(3) emissions by 54.1%and 45.3%,and the cumulative N_(2)O emissions by 50.8%and 38.9%,respectively.During the whole process,the degradation rates in Nano-Fe and Nano-KL treatments were 85.9%and 88.8%for CBZ,and 80.8%and 86.4%for IBU,respectively.Compared with control,Nano-Fe and Nano-KL increased the degradation of CBZ and IBU by 43.7%~53.1%.Correlation analysis showed that the degradation of CBZ and IBU during the composting process was significantly negatively correlated with moisture content,and significantly positively correlated with O_(2) and TOC content(the correlation coefficients were all greater than 0.90).These results indicated that the addition of nano-Fe_(3)O_(4) and nano-kaolin could effectively reduce nitrogen loss and promote the PPCPs degradation during the composting process,which provided data support and technical guidance for reducing environmental risks of land use of sewage sludge.
作者
姜继韶
崔慧林
侯睿
余豆
JIANG Jishao;CUI Huilin;HOU Rui;YU Dou(Henan Key Laboratory for Environmental Pollution Control,Key Laboratory of Ministry of Education for Yellow River and Huai River Water Environmental and Pollution Control,School of Environment,Henan Normal University,Xinxiang 453007)
出处
《环境科学学报》
CAS
CSCD
北大核心
2023年第11期163-172,共10页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.41805123)。
