铁碳填料预处理硝基苯废水及其抗板结稳定性

Pretreatment of nitrobenzene wastewater by iron-carbon filler and its stability against caking

为了探究铁碳微电解技术对硝基苯废水预处理的稳定性,基于市售的3种铁碳微电解填料构建硝基苯模拟废水的连续处理装置,结合材料表征结果探究了铁碳微电解填料的板结机制,并提出了抗板结功能的结构特征。结果表明:1号、3号填料为烧结型填料,2号填料为免烧型填料。3种铁碳填料对硝基苯的去除率为20%~40%,其中2号填料具有最高的去除率和最好的稳定性。1号和3号填料在长时间运行过程中产生大量堆积的含铁化合物,影响铁碳微电解的反应界面,从而导致硝基苯的去除率降低。填料抗板结的构型主要受到非铁碳组分骨架的影响,防止剥落的铁碳颗粒堵塞铁碳填料的反应界面,同时铁碳元素空间分布均匀,可为抗板结铁碳填料的制备提供参考。

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 microelectrolytic 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 burn-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.