کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10396455 | 889138 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Potential treatment alternative for laboratory effluents
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تکنولوژی و شیمی فرآیندی
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چکیده انگلیسی
The Chemical Analysis Laboratory under study weekly generates 46.5Â L effluent with low pH (0.7), high COD concentration (6535Â mg O2/L), sulphate (10390Â mg/L) and heavy metals (213Â mg Hg/L, 55Â mg Cr/L, 28Â mg Al/L, 22Â mg Fe/L, 10Â mg Cu/L, 4Â mg Ag/L). A treatment sequence has been proposed using a physical chemical step (coagulation/flocculation or chemical precipitation) followed by a biological step (anaerobic treatment). Removals of COD (18%), turbidity (76%) and heavy metals (64-99%) were attained only after adjusting pH to 6.5, without requiring the addition of Al2(SO4)3 and FeCl3. Due to the low COD:sulphate ratio (0.9-1.3), it was possible to efficiently operate the UASB reactor (at the biological step) only upon mixing the effluent with household wastewater. COD, sulphate and heavy metals removals of 60%, 23% and 78% to 100%, respectively, were attained for 30% effluent in the reactor feed. The results pointed to the need of a pretreatment step and mixing the effluent in household wastewater prior to the biological step. This alternative is feasible as this can be achieved using sanitary wastewater generated in the university campus.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bioresource Technology - Volume 96, Issue 15, October 2005, Pages 1650-1657
Journal: Bioresource Technology - Volume 96, Issue 15, October 2005, Pages 1650-1657
نویسندگان
Larissa C. Alves, Humberto M. Henrique, Alcina M.F. Xavier, Magali C. Cammarota,