کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
584448 | 1453182 | 2007 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Low-biodegradable composite chemical wastewater treatment by biofilm configured sequencing batch reactor (SBBR)
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کلمات کلیدی
ORPdissolved oxygen (mg/l)Composite chemical wastewaterSBBROCRGACOLRHRTBODSDRDNA - DNA یا اسید دزوکسی ریبونوکلئیکVSs - VSSdeoxyribonucleic acid - اسید deoxyribonucleicRNA - اسید ریبونوکلئیکribonucleic acid - اسید ریبونوکلئیکBiofilm - بیوفیلمSuspended solids - جامدات معلقTime - زمان hydraulic retention time - زمان هیدرولیکیSEM - مدل معادلات ساختاری / میکروسکوپ الکترونی روبشیVolatile suspended solids - مواد جامد معلق دائمیOxygen consumption rate - میزان مصرف اکسیژنOrganic loading rate - نرخ بارگیری آلیSequencing batch biofilm reactor - واکنش زنجیره ای راکتور بیوفیلمOxidation reduction potential - پتانسیل کاهش اکسیداسیونCod - کادوGranular activated carbon - کربن فعال گرانول
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
Biofilm configured system with sequencing/periodic discontinuous batch mode operation was evaluated for the treatment of low-biodegradable composite chemical wastewater (low BOD/COD ratio â¼0.3, high sulfate content: 1.75Â g/l) in aerobic metabolic function. Reactor was operated under anoxic-aerobic-anoxic microenvironment conditions with a total cycle period of 24Â h [fill: 15Â min; reaction: 23Â h (aeration along with recirculation); settle: 30Â min; decant: 15Â min] and the performance of the system was studied at organic loading rates (OLR) of 0.92, 1.50, 3.07 and 4.76Â kg COD/cum-day. Substrate utilization showed a steady increase with increase in OLR and system performance sustained at higher loading rates. Maximum non-cumulative substrate utilization was observed after 4Â h of the cycle operation. Sulfate removal efficiency of 20% was observed due to the induced anoxic conditions prevailing during the sequence phase operation of the reactor and the existing internal anoxic zones in the biofilm matrix. Biofilm configured sequencing batch reactor (SBR) showed comparatively higher efficiency to the corresponding suspended growth and granular activated carbon (GAC) configured systems studied with same wastewater. Periodic discontinuous batch mode operation of the biofilm reactors results in a more even distribution of the biomass throughout the reactor and was able to treat large shock loads than the continuous flow process. Biofilm configured system coupled with periodic discontinuous batch mode operation imposes regular variations in the substrate concentration on biofilm organisms. As a result, organisms throughout the film achieve maximum growth rates resulting in improved reaction potential leading to stable and robust system which is well suited for treating highly variable wastes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 144, Issues 1â2, 1 June 2007, Pages 108-117
Journal: Journal of Hazardous Materials - Volume 144, Issues 1â2, 1 June 2007, Pages 108-117
نویسندگان
S. Venkata Mohan, N. Chandrasekhara Rao, P.N. Sarma,