Elucidation of the stress mechanisms on activated sludge stability induced by yttrium oxide nanoparticles with cytotoxicity: Performance deterioration, biointerface variation and microbial response.

As technoscience advances, widespread use of nanoparticles (NPs) has resulted in environmental risks. This study focuses on the potential stress of 0-200 mg/L yttrium oxide (YO) NPs on the activated sludge stability. YO NPs progressively suppressed nitrification, caused significant NO accumulation (200 mg/L) and diminished activities of key functional enzymes.

Effects of dichlorobenzene, toluene, benzene and formaldehyde chemicals on Drosophila melanogaster mortality.

Environmental exposures to volatile organic compound (VOC) mixtures have received increasing attention, yet the risks are under studied. This study aimed to explore the risks of combined exposures to several commonly detected VOCs and to draw attention to the necessity of studying long-term and low-concentration environmental exposure patterns. In this study, we examined the effects of long-term and low-concentration exposures to VOCs like 1,2-dichlorobenzene, benzene, toluene and formaldehyde either alone or in combination on D.

The response and anti-stress mechanisms of nitrifying sludge under long-term exposure to CdSe quantum dots.

The wide application of CdSe quantum dots (QDs) increases its stress risk to sewage treatment systems. This study evaluated the response of nitrification performance, floc characteristics and microbial community of nitrifying sludge under long-term exposure to CdSe QDs. Results showed CdSe QDs (≥1 mg/L) would decrease the activity of ammonia monooxygenase (AMO).