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.

Residual ozone in microorganisms enhanced organics removal and shaped microbial community.

The residual ozone played an important role in enhancing the organics removal by stimulate subsequent biological processes. However, how the residual ozone affects the biological process is not well studied. In this work, a pilot scale integrated O-BAF, ordinary BAF and separated O-BAF were compared in advanced treatment of real bio-treated petrochemical wastewater.

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.

Bacterial response to formaldehyde in an MFC toxicity sensor.

Microbial fuel cells (MFCs) have been extensively studied as toxicity sensors. MFCs have potential as toxicity sensors because when their anodes are exposed to toxic substances or the concentration of the target is changed, the voltage generated by certain microorganisms with active electrical activity attached to the anode changes. However, the underlying reasons behind this phenomenon have not been deeply explored.

A quick start method for microbial fuel cells.

Microbial fuel cells (MFCs) have great potential to detect toxicity early. Study of toxicity sensors based on MFCs requires a large number of stable MFCs. However, the start-up time of MFCs is generally long, which limits research progress.

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.