期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 398, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123030
关键词
TiO2 NPs; Crystal; Physicochemical; P removal; Activated sludge
资金
- National Key Plan for Research and Development of China [2016YFC0401703]
- National Science Funds for Creative Research Groups of China [51421006]
- World-Class Universities (Disciplines) and Characteristic Development Guidance Funds for the Central Universities
- Fundamental Research Funds for the Central Universities [2019B63314]
- Key Program of National Natural Science Foundation of China [91647206]
- National Natural Science Foundation of China [51779078]
- Natural Science Foundation of Jiangsu Province of China [BK20171438]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJKY19_0530]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
The effect of nanomaterials aging, namely the transformation of comprehensive characteristics after experiencing real or complex environmental behaviors, on their ecotoxicology is still lacking. Moreover, the mechanisms by which NPs influence biological phosphorus (P) removal during sewage treatment require further elucidation. Therefore, we used both pristine and aged anatase (TiO2-A) and rutile (TiO2-R) NPs to investigate the mechanisms by which NPs affect P removal in a SBR. At 0.1 mg/L, the four types of NPs (pristine and aged) had no significant effect on sludge purification after acute (72-h) exposure under simulated sunlight. However, at 50 mg/L-regardless of the crystalline phase of the NPs-SOP and COD removal efficiency dropped steeply to approximately 42.2-82.4 % (p < 0.05) and 69.8-83.3 % (p < 0.05), respectively, especially in the pristine TiO2-NPs groups because of decrease of richness and diversity of genus level of PAOs and enzyme activity of both PPK and PPX, and the sluggish transformation of PHA and glycogen. Aging reduced the ability of NPs toxicity. The toxicity mechanisms of TiO2-NPs included lipid peroxidation and contact damage, or leakage from bacterial cytoplasmic membrane, which are closely related to photooxidation capacity and aqueous solution stability-i.e., nanoscale effects-and the impacts of aging or inclusion.
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