Élimination de composés organiques par procédé pilote

Abstract

Water pollution in Algeria is a problem because of solid and liquid wastes reject which are thrown in nature. Recently, Algeria reacted against hydrical pollution, using finances in research for this domain in order to get efficient and rapid solutions. Our study was made for this context, through which we tried to treat a colorant (used in textile industry) with plasma-coagulating. The glidare (sliding lumber or crapping arch) is a simpler process with a slight cost, was combined with coagulation to eliminate a green anthraquinonical Acid 25( AG25). We have initiated the treatment process by plasma to ameliorate poluant elimination. At the beginning, AG25 molecules were sensibilized excited) Durant a very brief duration about 30 seconds. Plasma-sensibilation is an original approach which application can be extended to other residual water treatment process; we got a full colorant elimination in 20 minutes at the presence of ferric salt , hydrated six times (FeC136H2O) , and we got the same resultant by combining plasma-sensibilzation at coagulation in 10 minutes. To understand more the phenomenon a certain number of physic- chemical analysis was done on solute and lested flock. The results have shown that there exist a good synergy between plasma-sensibilazation and coagulatiing process where (i)zêta potential tends to zero more quickly to sensibilized samples than those directly coagulated ; (ii) the analysis by Infrared spectroscopy to transform from Fourier indicated that the sensibilization gives a better AG25 molecules migration at the presence of ferric salt , hydrated six times compared to non sensibilized samples for (vi) the ferric material balance, the results show that disappearing-appearing kinetics of iron is more rapid at the plasma-coagulating process than that of coagulation alone ; then , we have proposed a demonstrative mechanism of hybrid process. We have also dealt with another work about azoic colorant treatment extended at the industrial sector, and at the laboratories (solidity analysis); it’s the Noir Erichromet T (NET), the colorant was eliminated by coagulating -floculating , but with adding of a floculant .In 40 minutes , we have obtained a colour rate reducing of 96 % , and DCO deduction of 70 %. Coagulating process is a very efficient treatment mode, but its inconvenient is the flocks formation during the treatment; this is why that we have processed to reuse of flocks formed during A25 coagulating and the NET by azoic colorant (AO7) absorbing. The first results are satisfying and significative. Another work which has been done for sample treatment of 250L taken from Oued Cheliff River by MP50 pilot of coagulatiing-floculatiing-decantation. Oued Cheliff River is an important source of chemical and bacteriological pollution, since it feeds Many barrages (OUED ELKHEIR, SIDI ABED) along its course. The preliminary results of chemical parameters characterization (such as pH; DCO; DBO; Pb2, Fe2 and so on) have indicated the presence of a pollution. The study was done by calculating physico-chemical parameters that lead our pilote ( as debit, speed, pH, coagulant dose, floculant dose, and so on, after fixing all these parameters we proceed to treatments, that we got a reducing rate of 87 % after a recycling in 20 minutes. We conclude, after all these works, the hybrid process permitted the appearing of a new concept at the domain of waters treatments.