期刊
WATER SCIENCE AND TECHNOLOGY
卷 76, 期 7, 页码 1875-1883出版社
IWA PUBLISHING
DOI: 10.2166/wst.2017.370
关键词
bio-flocculation; COD; Opuntia ficus-indica; suspended solids; turbidity
资金
- Tunisian Ministry of Higher Education and Scientific Research via the Department of Geology of Gafsa
- Tunisian Ministry of Higher Education and Scientific Research via Faculty of Sciences of Gafsa
The cactus tree, species Opuntia ficus-indica, is a primary material of many products in various domains such as cosmetics, medicine and nutrition. In the present work, we assess its potential as a flocculant. We tried a technique which adopts three sequential treatments that used coagulation, flocculation and sedimentation processes under certain operating conditions. For this purpose, we used the aluminum sulfate (AS) as coagulant and fresh cladodes juice (FCJ) as bioflocculant. All tests were carried out on high turbid urban wastewater collected from the Metlaoui's Wastewater Treatment Plant (MWTP) (in Gafsa in southwest Tunisia). Experiments with this couple AS/FCJ show very interesting results: a high-removal of turbidity (TUR), suspended solids (SS) and chemical oxygen demand (COD). The percentages of abatement of these parameters are respectively 93.65%, 82.75% and 64.30%. The experimental results of the present study prove that the turbidity, SS and COD removal efficiency of new technique is superior to that of conventional process (with only AS). By this technique, we save 50% in AS dose. Moreover, flocs formed by the treatment using AS/FCJ are coarse and readily settleable.
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