Yamada Kaho, Fukushima Toshikazu, Freguia Stefano
Advanced Technology Research Laboratories, Research & Development, Nippon Steel Corporation, Futtsu, Japan E-mail:
Advanced Technology Research Laboratories, Research & Development, Nippon Steel Corporation, Futtsu, Japan.
Water Sci Technol. 2022 Apr;85(7):2254-2264. doi: 10.2166/wst.2022.087. Epub 2022 Mar 10.
Coke-oven wastewater is usually treated with the activated sludge process, which requires large amounts of electrical energy for aeration and sludge disposal. A more sustainable treatment is strongly required. Recently, microbial fuel cells (MFCs) are focused as a technology for the production of electricity from wastewaters with simultaneous removal of organic matter. However, no MFC has been reported that can remove phenol, thiosulfate and thiocyanate simultaneously without aeration. Phenol can generally be removed well, whereas thiocyanate is relatively difficult to degrade. In this study, a dual-chamber MFC (D-MFC) was designed and equipped with a thiocyanate-degrading biofilm enriched on an air cathode. The D-MFC degraded phenol and thiosulfate in the anode chamber at the rate of 104 and 331 mg/L/day, respectively and subsequently degraded thiocyanate in the cathode chamber at the rate of 250 mg/L/day. The D-MFC showed high thiocyanate degradation rate. This suggests that pre-enrichment could accelerate thiocyanate degradation in MFC. In addition, thiocyanate degradation was not inhibited by phenol as thiocyanate was removed in the cathode chamber after phenol was removed in the anode chamber. This study demonstrated the feasibility of treating coke-oven wastewater by a D-MFC with a thiocyanate-degrading biofilm enriched at the air cathode.
焦炉废水通常采用活性污泥法处理，该方法在曝气和污泥处理方面需要大量电能。因此，迫切需要一种更具可持续性的处理方法。近年来，微生物燃料电池（MFC）作为一种能从废水中发电并同时去除有机物的技术受到关注。然而，尚未有报道称存在一种无需曝气就能同时去除苯酚、硫代硫酸盐和硫氰酸盐的MFC。苯酚通常能被很好地去除，而硫氰酸盐相对较难降解。在本研究中，设计了一种双室MFC（D-MFC），并在空气阴极上富集了硫氰酸盐降解生物膜。该D-MFC在阳极室中分别以104和331 mg/L/天的速率降解苯酚和硫代硫酸盐，随后在阴极室中以250 mg/L/天的速率降解硫氰酸盐。该D-MFC显示出较高的硫氰酸盐降解率。这表明预富集可以加速MFC中硫氰酸盐的降解。此外，由于苯酚在阳极室中被去除后硫氰酸盐在阴极室中被去除，硫氰酸盐的降解不受苯酚的抑制。本研究证明了利用在空气阴极富集硫氰酸盐降解生物膜的D-MFC处理焦炉废水的可行性。
