Pre-treatment of olive mill wastewater by chitosan coagulation and advanced oxidation processes

被引：108
作者：
Rizzo, Luigi [1 ]
Lofrano, Giusy [1 ]
Grassi, Mariangela [1 ]
Belgiorno, Vincenzo [1 ]
机构：
[1] Univ Salerno, SEED, Dept Civil Engn, I-84084 Fisciano, SA, Italy
来源：
SEPARATION AND PURIFICATION TECHNOLOGY | 2008年 / 63卷 / 03期
关键词：
Fenton; Natural organic coagulants; Organic sludge; Photocatalysis; Photo-Fenton;
D O I：
10.1016/j.seppur.2008.07.003
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
In the present work the combined pre-treatment of actual olive mill wastewaters by coagulation with natural organic coagulant, such as chitosan, and the advanced oxidation processes, specifically photocatalysis (PC), Fenton (F) and photo-Fenton (PF), was investigated. The optimum removal of total suspended solids (TSSs, 81%) by chitosan coagulation was achieved at actual pH (4.3) for 400 mg L-1 coagulant dose. The maximum organic matter removals by F (85%) and PF (95%) processes were achieved after 2.0 and 1.0 h, respectively by using 15,000/1852 (w/w) ratio of H2O2/FeSO4. On the opposite, in PC experiments, after an initial decrease in the early minutes of the treatment, a subsequent increase versus irradiation time was observed for both UV absorbance at 280 nm and chemical oxygen demand (COD); probably a partial oxidation made some organics detectable only after treatment. (c) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：648 / 653
页数：6
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