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市営二次排水のフェントン酸化：触媒としてのFe/Ce-RGO（還元型グラフェン酸化物）とFeの比較
Fenton oxidation of municipal secondary effluent: comparison of Fe/Ce-RGO (reduced graphene oxide) and Fe as catalysts.
PMID: 30196458 DOI: 10.1007/s11356-018-3150-4.
抄録
Fe/Ce-RGO(還元型グラフェン酸化物)とFeを触媒として用いた不均質・均質フェントン法による市営二次排水の高度処理について検討し、比較検討を行った。スルファメタジン(SMT)を廃液中に添加し、新たな汚染物質除去効果を検討した。走査型電子顕微鏡(SEM)とサイクルボルタンメトリーカーブを用いてFe/CE-RGO触媒の特性を調べた。市営二次排水の溶存有機炭素(DOC)、可溶性化学的酸素要求量(SCOD)、SMT、254nm(UV)における紫外可視分光法による除去効果を調べた。二次廃液(SMT無添加)のDOC除去効率は、Fe/Se-RGO及びFeを触媒として使用した場合、それぞれ36.30%及び11.74%であった。不均質フェントン法でのDOC,SCOD,SMTの除去効率は、均質フェントン法よりも高かった。また、三次元励起発光マトリックス(3DEEM)蛍光,可溶性微生物生成物(SMPs),フミン酸,紫外線の変化を測定した結果、両プロセスともに紫外線芳香族蛋白質とフミン酸は急速に減少したが、多糖類や蛋白質様物質は分解しにくいことがわかった。また、フェントン処理後に有害物質が発生したが、処理排水の生分解性は向上していた。
The advanced treatment of municipal secondary effluent by heterogeneous and homogeneous Fenton processes using Fe/Ce-RGO (reduced graphene oxide) and Fe as catalysts was studied and compared. Sulfamethazine (SMT) was spiked in the effluent to examine the effectiveness of the emerging contaminant removal. The Fe/Ce-RGO catalyst was characterized using a scanning electron microscope (SEM) and cycle voltammetry curves. The removal of dissolved organic carbon (DOC), soluble chemical oxygen demand (SCOD), SMT, and ultraviolet-visible spectroscopy in 254 nm (UV) of municipal secondary effluents was examined. The DOC removal efficiency of secondary effluent (without addition of SMT) was 36.30% and 11.74% using Fe/Ce-RGO and Fe as catalysts, respectively. The removal efficiency of DOC, SCOD, and SMT in heterogeneous Fenton process was higher than that in homogeneous Fenton process. The changes of three-dimensional excitation-emission matrix (3DEEM) fluorescence, soluble microbial products (SMPs), humic acids, and UV were determined, and the results indicated that UV aromatic proteins, and humic acids decreased rapidly in both processes; however, polysaccharides and protein-like substances were difficult to degrade. Although some toxic substances produced after Fenton-like treatment, the biodegradability of the treated effluent was enhanced.