Development, dilemma and potential strategies for the application of nanocatalysts in wastewater catalytic ozonation: A review.

With the continuous development of nanomaterials in recent years, the application of nanocatalysts in catalytic ozone oxidation has attracted more and more researchers' attention due to their excellent catalytic properties. In this review, we systematically summarized the current research status of nanocatalysts mainly involving material categories, mechanisms and catalytic efficiency. Based on summary and analysis, we found most of the reported nanocatalysts were in the stage of laboratory research, which was caused by the nanocatalysts defects such as easy aggregation, difficult separation, and easy leakage.

A thorough observation of an ozonation catalyst under long-term practical operation: Deactivation mechanism and regeneration.

Heterogeneous catalytic oxidation, as an efficient advanced treatment technology, has been gradually applied in industrial wastewater treatment. The fixed bed technique is one of the most popular catalytic ozonation methods. However, few studies have concentrated on the long-term operation effects on catalysts.

Iron foam coupled hydrolysis acidification for trichloroacetaldehyde treatment: Strengthening characteristics and mechanism.

This research studied transformative characteristics and enhanced mechanism of trichloroacetaldehyde (TCAL), one of chlorinated acetaldehydes (CAAs), by coupled-type iron foam enhanced hydrolysis acidification (HA) reactor. Main results were given that better dechlorination and aldehyde removal were achieved at this process than coupled-type iron foam enhanced HA, alone iron foam and HA reactor. The reasons were due to better strengthening effects of iron foam and HA, iron foam reduced TCAL toxicity to microbes caused an improvement of microbial activity, therefore, volatile fatty acids (VFAs) content and acetate acid (Ac) ratio were increased compared with HA.

A magnetic-void-porous MnFeO/carbon microspheres nano-catalyst for catalytic ozonation: Preparation, performance and mechanism.

Wastewater treatment is essential to guarantee human health and ecological security. Catalytic ozonation with nanocatalysts is a widely studied and efficient treatment technology. However, this method has always been limited by nanocatalysts disadvantages such as easily loss, difficult to separate and reuse, and catalytic ability decay caused by aggregation, which could cause severe resources waste and potential risk to human health and ecosystem.

Acidification inhibition, biodechlorination, and biotransformation of chlorinated acetaldehydes on acidogenic sludge and microbial community changes.

Chlorinated acetaldehydes (CALs) are typical chlorinated organic compounds that posing a great threat to biological wastewater treatment plants. In this study, volatile batch acid (VFA) tests were employed to investigate the acidification inhibition, biodechlorination, and biotransformation of high-strength CALs on hydrolytic acidification. The results indicated that the optimum parameters were 4 g/L sludge, pH = 8, and glucose as an electron donor.

Inhibition and removal of trichloroacetaldehyde by biological acidification with glucose co-metabolism.

Biological acidification plays a crucial role in biological removal of organic compounds during petrochemical wastewater treatment. Trichloroacetaldehyde is a typical organic pollutant in petrochemical wastewater, however, no studies have been conducted on its effect on biological acidification. In this study, batch bioassays of volatile fatty acids were conducted to explore the inhibitory effect of trichloroacetaldehyde on biological acidification, the variations of key enzymes and extracellular polymeric substances under trichloroacetaldehyde shock, and the mechanism of trichloroacetaldehyde removal.

Recent development of recycling lead from scrap CRTs: A technological review.

Cathode ray tubes (CRTs) contain numerous harmful substances with different functions. Lead is found in the funnel glass of CRTs. Improperly treated toxic lead may pose significant risks to human health and the environment.