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In this work we used a new organic bio flocculant (BF), which we extracted from natural seeds of Lepidium Sativum (LS). This extract is known for it’s performance in various fields such as cosmetology, pharmacology and food products. Moreover, it does not present any danger to human health. The main purpose of our study is the exploitation of a new natural supports, as bio polymers in the treatment of water loaded with marl limestone suspended solids (SS) and trace elements, including Copper and zinc. We studied the effectiveness of this extract in comparison with other products usually used in the treatment and depollution of water; the preliminary tests were carried out on pseudo samples prepared at the laboratory level. The comparative study with a synthetic flocculant (Anionic polyacrylamide: APA), usually used in water treatment, provided a good competitiveness with an important flocculation power. The combination of the two steps of neutralization and coagulation by aluminum sulfate (AS), followed by a flocculation step by the new flocculant (LS), then a natural decantation, gave significant results, in the abatement of Cu2+, Zn2+ and (SS). For the solution rich in marl limestone, the turbidity passes from an average of 600 NTU to values close to 1 NTU. The sludge thus produced after treatment is submitted to an analysis by (SEM) and (XRD) and the retained chemical elements are detected. The study generally enters as a sustainable development strategy capable of improving long-term global water security and protecting the environment from synthetic products used excessively in water treatment. |
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