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Integrating coagulation-flocculation and UV-C or H.sub.2O.sub.2/UV-C as alternatives for pre- or complete treatment of biodiesel effluents
The feasibility of biodiesel effluent treatment combining coagulation-flocculation with a photolytic process was evaluated, being the photolytic process involving the irradiation of the effluent by UV-C, or by UV-C irradiation with simultaneous addition of H.sub.2O.sub.2 (H.sub.2O.sub.2/UV-C). The coagulation-flocculation was performed at the natural pH of the effluent (pH 2.9) using different Fe.sup.3+ salts (chloride, nitrate and sulfate) at different concentrations (0.25, 0.50 and 1.0 mmol L.sup.-1) of the counterions. The best results were achieved using 0.50 mmol L.sup.-1 Fe(NO.sub.3).sub.3. Following, the degradation of the organic load and toxicity reduction of the pre-treated effluent by UV-C irradiation was evaluated. The H.sub.2O.sub.2/UV-C process showed to be advantageous, mainly when multiple additions of H.sub.2O.sub.2 were used during the course of the reaction. Additionally, the influence of the initial pH on the degradation was also evaluated. A high level of mineralization (94%) was achieved after 6 h of irradiation concomitantly with multiple additions of 2,000 mg L.sup.-1 H.sub.2O.sub.2, and with the effluent at the natural pH. Thus, using coagulation-flocculation followed by the H.sub.2O.sub.2/UV-C process, it was possible to achieve a favourable condition for reuse of the pre-treated effluent, since, in addition to the significant reduction of the organic load, the final DBO.sub.5 (<120 mg L.sup.-1) and oils & fats (<50 mg L.sup.-1) are below the limits established by the Brazilian legislation. Furthermore, a reduction of 78% of acute toxicity to V. fischeri (from 89% to 20%) was reached. The results suggest, therefore, that this process is a viable option for treatment of this kind of effluent.
Integrating coagulation-flocculation and UV-C or H.sub.2O.sub.2/UV-C as alternatives for pre- or complete treatment of biodiesel effluents
The feasibility of biodiesel effluent treatment combining coagulation-flocculation with a photolytic process was evaluated, being the photolytic process involving the irradiation of the effluent by UV-C, or by UV-C irradiation with simultaneous addition of H.sub.2O.sub.2 (H.sub.2O.sub.2/UV-C). The coagulation-flocculation was performed at the natural pH of the effluent (pH 2.9) using different Fe.sup.3+ salts (chloride, nitrate and sulfate) at different concentrations (0.25, 0.50 and 1.0 mmol L.sup.-1) of the counterions. The best results were achieved using 0.50 mmol L.sup.-1 Fe(NO.sub.3).sub.3. Following, the degradation of the organic load and toxicity reduction of the pre-treated effluent by UV-C irradiation was evaluated. The H.sub.2O.sub.2/UV-C process showed to be advantageous, mainly when multiple additions of H.sub.2O.sub.2 were used during the course of the reaction. Additionally, the influence of the initial pH on the degradation was also evaluated. A high level of mineralization (94%) was achieved after 6 h of irradiation concomitantly with multiple additions of 2,000 mg L.sup.-1 H.sub.2O.sub.2, and with the effluent at the natural pH. Thus, using coagulation-flocculation followed by the H.sub.2O.sub.2/UV-C process, it was possible to achieve a favourable condition for reuse of the pre-treated effluent, since, in addition to the significant reduction of the organic load, the final DBO.sub.5 (<120 mg L.sup.-1) and oils & fats (<50 mg L.sup.-1) are below the limits established by the Brazilian legislation. Furthermore, a reduction of 78% of acute toxicity to V. fischeri (from 89% to 20%) was reached. The results suggest, therefore, that this process is a viable option for treatment of this kind of effluent.
Integrating coagulation-flocculation and UV-C or H.sub.2O.sub.2/UV-C as alternatives for pre- or complete treatment of biodiesel effluents
2017
Article (Journal)
English
BKL:
43.00
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