Abstract
Wastewaters from textile industries are known for their difficulty to treat, several alternative technologies are applied for their treatment. In this context, the study examined a hybrid treatment system, composed of electrocoagulation combined with a natural coagulant (extract of Moringa oleífera lam seeds) to remove reactive dye Blue 5G aqueous solutions. The work evaluated the use of milder operating conditions to improve the efficiency of treatment, with reduced demands for electrical power and coagulant. The following factors were evaluated: electric current intensity, natural coagulant concentration and hydraulic retention time. A quadratic model was adjusted and validated at a 5% significance level. The overall optimization resulted in conditions of 0.28 A for electrical current intensity, 1000.00 mg L-1 of aqueous extract of Moringa oleífera lam and 5 min for hydraulic retention time. While operating under optimal conditions, the removal of 71.38% of color and 5.22 mg L-1 of iron residual concentration was achieved.
Highlights
IntroductionMany there are still many problems due to contamination and water pollution of waters
Despite current technological developments, many there are still many problems due to contamination and water pollution of waters
Empirical Modeling of color removal promoted by treatment hybrid system Based on the results presented in Table 2, it was possible to evaluate the effects of the factors studied in response variable color removal
Summary
Many there are still many problems due to contamination and water pollution of waters. The development and improvement of technologies for effluent treatment are needed, from the perspective of the technical feasibility of pollutant removal, and from the social-environmental viewpoint, since the minimization of treatment system waste is an important factor. The technique can be more efficient than the coagulation/flocculation process normally used. This process uses the basic foundation of coagulation/flocculation, producing redox reactions, and generates micro bubbles that ascend and eventually interact with whole system. The result is flocculation and flotation of the pollutant as a sludge, and optimization of treatment process effectiveness (Aquino Neto et al, 2011)
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