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- W2353714881 abstract "An efficient and low-cost technology was developed for high concentration arsenic wastewater recycling by combining the advantages of sulfuration and polymer composite flocculants.In the experiment,the high-arsenic wastewater from a smelter was chosen as the treatment object.The arsenic was recycled using Na2S·9H2O for sedimentation.The Na2S·9H2O dosage,dosing manner,initial pH,reaction time were optimized before the experiments.The arsenic dregs were characterized by X-ray diffraction(XRD) and X-Ray Fluorescence(XRF).The results showed more than 98% of arsenic was recovered under the optimal condition with Na2S·9H2O dosage of 55 g/L,a charging style of twice dosing,an initial pH of 2.0 and a reaction time of 5 minutes.The arsenic content in the treated wastewater was 0.61 g/L,and contents of arsenic and sulfur in arsenic dregs reached as the percentages of 49.15% and 40.98% with other heavy metallic ions.The wastewater from sulfuration process was consequently treated with a polymer composite flocculants.The parameters such as optimal proportioning,dosage,pH and flocculants were investigated first.The results showed that: under the condition of Fe∶ Si = 5∶ 1,flocculant dosage of 7 mL/L and pH of 8,arsenic can be deeply removed,and the remaining arsenic concentration was lower than 0.3 mg/L.These results demonstrated that this method is superior to the common flocculants under the same conditions.Based on above findings,expanded multi-batch experiments using combination technique(sulfuration with a polymer composite flocculants) were conducted as well.And the results showed that: the average recovery rate of arsenic was higher than 98%,and average residual arsenic content was less than 0.3 mg/L.The experimental results proved that the combined technique can achieve the reclamation of high-arsenic wastewater,with promising application on the engineering and commercial uses." @default.
- W2353714881 created "2016-06-24" @default.
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- W2353714881 date "2013-01-01" @default.
- W2353714881 modified "2023-09-23" @default.
- W2353714881 title "Study on Treatment of Acidic High-Arsenic Wastewater with Na_2S and Polymer Composite Flocculants" @default.
- W2353714881 hasPublicationYear "2013" @default.
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