溶液吸收结合铁碳微电解法处理三氯乙烯废气实验研究

摘要

The treatment of trichloroethylene (TCE) in gas stream by absorption combined with iron filings-activated carbon(Fe-AC) micro-electrolysis was experimentally investigated. The experiment was conducted in a tubular reactor filled with iron filings, activated carbon powder and iron filings-activated carbon combination, respectively. All the fillings were immerged in acidic water solutions. The gas stream containing TCE is introduced to the reactor from the bottom of reactor and flows through the Fe-AC micro-electrolysis zone, and then discharges from the top of reactor. Experimental result shows that the removal of TCE is higher with Fe-AC combination as the filling material than that with only iron filings or active carbon as filling materials. After reaction, the production of Cl-in aqueous solution was confirmed for both using iron filings and Fe-AC combination as fillings. However, the production of Cl-is much more with using Fe-AC combination as fillings, which is attributed to the effect of Fe-AC micro-electrolysis in the solution. It was also found that both the dechloridation and removal of TCE increase with the decrease of solution pH value.%采用溶液吸收结合铁碳微电解反应处理气流中的三氯乙烯(TCE)废气。实验采用管式反应器，管内分别充填铁屑、活性碳和铁屑-活性炭(Fe-AC)组合填料，所有填料浸没在酸性吸收液中。含有TCE的气体从反应器下部导入，经铁屑-活性炭(Fe-AC)微电解区后，从反应器上部排出。研究了铁屑、活性炭及铁屑-活性炭(Fe-AC)组合三种条件下对TCE的去除效果，考察了溶液pH对TCE去除率的影响。实验结果表明采用Fe-AC组合对TCE废气的去除率要高于在溶液中分别添加铁屑或活性炭的情况，在铁屑和Fe-AC作用下的吸收液中均测得氯离子存在，表明铁屑和Fe-AC体系都具有脱氯还原的效果，而Fe-AC微电解对TCE的脱氯效果更好；较低的pH值有利于提高TCE的还原脱氯和去除效果。