Influence of Fenton's reagent doses on the degradation and mineralization of H-acid.
The recalcitrant H-acid (1-amino-8-naphthol-3,6-disulfonic acid) in aqueous solution was oxidized by Fenton process, focusing on the relation of Fenton's reagent doses and degradation products. The experimental results showed that COD and TOC removals and biodegradability (BOD/COD ratio) of the solution increased with increasing Fenton's reagent doses. Over 80% COD can be removed and the biodegradability was improved significantly. It was found that major SO3H and NH2 groups in H-acid molecules were mineralized to SO4(2-) and NH4(+) ions during Fenton oxidation processes. H-acid degradation intermediates with benzene structures substituted by hydroxyl and/or carboxyl groups were identified by GC-MS. It was also found that short-chain fatty acids primarily oxalic acid were degradation products of H-acid by Fenton oxidation. Oxalic acid accumulated could account for approximately 60% of the residual TOC. The degradation pathway of H-acid was proposed based on above analyses in this work.
School of Environmental Science and Engineering, Donghua University, Shanghai 200051, PR China.
Huanhuan
H
Liu
Quanyuan
Q
Chen
Yang
Y
Yu
Zhenhong
Z
Liu
Gang
G
Xue
D000143:Acids; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D008401:Gas Chromatography-Mass Spectrometry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D017665:Hydroxyl Radical; D007501:Iron / Q000737:chemistry*; D009282:Naphthalenesulfonates / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry; D009930:Organic Chemicals / Q000737:chemistry; D019815:Oxalic Acid / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D013451:Sulfonic Acids / Q000737:chemistry; D013455:Sulfur / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
D000143:Acids; C045076:Fenton's reagent; D009282:Naphthalenesulfonates; D009930:Organic Chemicals; D013451:Sulfonic Acids; D014874:Water Pollutants, Chemical; D017665:Hydroxyl Radical; C450879:1-naphthol-8-amino-3,6-disulfonic acid; D013455:Sulfur; D019815:Oxalic Acid; D006861:Hydrogen Peroxide; D007501:Iron; D009584:Nitrogen; D010100:Oxygen
Biodegradability; Degradation intermediates; Fenton oxidation; H-acid; Naphthalene sulfonic acid