Pretreatment of nitrobenzene wastewater by iron-carbon filler and its stability against caking
The stability of iron-carbon micro-electrolysis technology for nitrobenzene wastewater pretreatment was explored by a continuous treatment device for nitrobenzene simulated wastewater based on three kinds of iron-carbon micro-electrolytic fillers sold on the market,and the caking mechanism of iron-carbon micro-electrolytic and its anti-caking structures combined with material characterization were revealed.The results showed that fillers 1 and 3 were sintered ones,and filler 2 was bum-free one.The removal rates of nitrobenzene by three kinds of iron-carbon fillers were 20％～40％,of which the filler 2 had the highest removal rate and the best stability.Fillers 1 and 3 could produce a large amount of accumulated iron-containing compounds during their long-term operation,which hindered the iron-carbon micro-electrolysis reaction interface and caused the decrease of the removal rate of nitrobenzene.The anti-caking configuration was mainly affected by the non-iron carbon skeleton,which prevented the spalling iron carbon particles from blocking the interface of the iron carbon filler.Meanwhile,the spatial distribution of iron carbon elements was uniform,which provides a theoretical basis for the preparation of the anti-caking iron carbon filler.
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