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Conventional microbial electrolysis cell (MEC) for treating nitrobenzene (NB) suffers from insufficient mass transfer, leading to low removal efficiency. Electrochemical filtration (EF) was coupled with MEC to construct an EF-MEC system, which increased the removal rate of NB by 6.5 times in comparison with a conventional MEC. The EF process enhanced the convection mass transfer of NB and hence increased its removal. The EF process was also accompanied by a lower loading rate of NB so that 88.1% of NB in the feed could be reduced and the conversion ratio of NB to AN was high up to 98.2%. Therefore, the toxic effects on anode biofilms were relieved, leading to the enrichment of electroactive microorganisms, especially Geobacter , Desulfovibrio, and Rhodopseudomonas. The enriched anode electroactive microorganisms reciprocally promoted electrogenesis and hence the removal of NB. This EF-MEC system has functionally complemented the benefits between the EF and MEC processes, and it is very promising in treating NB-contained wastewater. [Display omitted] • Electrochemical filtration (EF) was coupled with a microbial electrolysis cell (MEC). • Nitrobenzene was rapidly reduced resulted from the enhanced mass transfer by EF. • Anode electroactive microorganisms were enriched and promoted the electrogenesis. [ABSTRACT FROM AUTHOR]

In the process of using high-pressure flat membranes to treat coal chemical wastewater, the effects of high-pressure flat membranes on the concentration of salt ions and the removal of pollutants were studied under the conditions of different concentrations of influent TDS. COD and silicon dioxide. The results showed that when the concentration of influent TDS was 35 000 -55 000 mg/L, the economic benefit of high-pressure flat membrane operation was the best, and the concentration ratio of high-pressure flat membranes was stable, varying from 3.3 to 3.6. As the concentration of influent organic matter ranged from 100 to 1 800 mg/L, the removal rate of organic matter ranged from60% to79%. In addition, the retention rate of high-pressure flat membranes to silicon dioxide was more than 90%. [ABSTRACT FROM AUTHOR]