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FBR-Fenton/GACプロセスにおける逆浸透性濃縮物処理のための有機物除去とその場での顆粒活性炭再生
Organics removal and in-situ granule activated carbon regeneration in FBR-Fenton/GAC process for reverse osmosis concentrate treatment.
PMID: 32663698 DOI: 10.1016/j.watres.2020.116119.
抄録
砂，ゼオライト，粒状活性炭（GAC）の3種類の担体を用いた逆浸透性濃縮物（ROC）処理に流動床反応炉フェントン（FBR-Fenton）プロセスを採用した。吸着試験の結果、GACが3種類の担体の中で最も優れた吸着性能(15hで最大COD除去率78%)を示し、ROC有機物の吸着は2段階吸着モデルに従うことがわかった。FBR-Fenton/GACプロセスは、カラム飽和後に3つの流動床でフェントン酸化反応を実施し、ROC中のCOD除去率が72%と最も高く、BOD/COD比が0.03から0.3に向上することを示した。また、長期運転データから、担体としてのGACの性能安定性は良好であることが示された。また、GAC流動床は鉄の結晶化プロセスを経て最高の全鉄除去率を得た。FBR-Fenton/GACプロセスを用いたROC処理では、表面積,細孔容積,吸着容量ともに90%以上の回収率でGACのin-situ再生が継続的に観察された。メカニズム研究の結果、FBR-Fenton/GACプロセスのCOD除去性能の向上は、均質なフェントン反応,GAC吸着及びGAC/HO触媒反応の複合効果によるものであることが明らかになった。
Fluidized bed reactor Fenton (FBR-Fenton) process was adopted for reverse osmosis concentrate (ROC) treatment with three types of carriers, including sand, zeolite and granular activated carbon (GAC). Adsorption studies demonstrated that GAC achieved the best adsorption performance (maximum COD removal of 78% in 15 h) among the three carriers, and the adsorption of ROC organic matters followed a two-stage adsorption model. Fenton oxidations were carried out in three fluidized beds after column saturation, and FBR-Fenton/GAC process achieved highest COD removal (72%) and most BOD/COD ratio enhancement (from 0.03 to 0.3) in ROC. Long-term operation data demonstrated good performance stability of GAC as the carrier. In addition, GAC fluidized bed obtained highest total iron removal rate via iron crystallization process. Continuous in-situ GAC regeneration with more than 90% recoveries of surface area, pore volume and adsorption capacity were observed along the ROC treatment with FBR-Fenton/GAC process. Mechanism studies revealed that better COD removal performance in FBR-Fenton/GAC process was attributed to the combining effects of homogenous Fenton reaction, GAC adsorption and GAC/HO catalytic reaction.
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