阴极氧还原产电生物可渗透反应栅的研究 Ⅱ.酸蚀处理对不锈钢丝电极性能的影响

Study on cathodic oxygen reduction electricigenic permeable reactive barrier:Ⅱ.Effects of acid pre-treatment on electrode performance of stainless steel fibers

不锈钢毛虽然用作阴极氧还原产电生物反应栅(CORE-PRB)的电极材料虽然有很多优点,但是反应电流较小。尝试对不锈钢毛进行酸蚀处理后用作电极材料,并分别研究比较了4种不同电极组合的产电反应性能。酸蚀处理显著提高不锈钢毛阳极的反应性能,并对提高不锈钢毛阴极的反应性能有一定作用。酸蚀的作用主要是使不锈钢毛表面变得粗糙,有利于提高电极表面积和材料的生物亲和性。虽然生物产电反应对COD降解的直接贡献不到10%,但是不同电极组合下COD的去除率与它们生物产电反应的贡献率呈现高度正相关性。

The current of stainless steel cathodic oxygen reduction electricigenic permeable reactive barrier （CORE-PRB） is limited though stainless steel fiber has many advantages to act as the electrodes. It was tried to pre-treat the stainless steel fiber with hydrochloride acid to improve its electrode performance in CORE-PRB. Four types of the electrode pairs were tested. Acid pre-treatment improved much more of the anode performance than of the cathode performance. Acid-pretreatment made the surface of the fibers coarser so that the specific surface area of the fibers and the attachment of the microbes were improved. The COD removals of the different electrode pairs were quite positively correlated with the coulomb efficiency though the later was less than 10%.