Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 28, No. 6 (June 2015) 855-863    Article in Press

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  PHOSPHORUS REMOVAL FROM DAIRY WASTEWATER IN BATCH SYSTEMS UNDER SIMULTANEOUS AEROBIC/ANAEROBIC CONDITIONS: APPLICATION OF RESPONSE SURFACE METHODOLOGY
 
M. Amini
 
( Received: January 21, 2015 – Accepted: June 11, 2015 )
 
 

Abstract    The objective of this paper is simultaneous of aerobic and anaerobic process for phosphorus removal from a dairy wastewater. The system consists of a granular sequencing batch reactor (SBR) working under alternating aerobic/anaerobic conditions. In order to analyze the process, four significant variables viz. MLSS, COD/N ratio, aeration time and cycling time and four dependent parameters as the process responses were studied using a central composite design (CCD) under response surface methodology (RSM). The percentage removal of PO43- and amount of SVI, MLSS, MLVSS, in batch runs were 98.34%, 44.03 ml/g, 5646.97 mg/l and 4435.99 mg/l, respectively. This study shows that the high removal of phosphors from dairy wastewater with microbial granules cultivated under the alternating aerobic–anaerobic conditions has been achieved successfully in batch systems.

 

Keywords    Keywords: phosphors removal percentage, dairy wastewater treatment, batch systems, RSM کلمات کلیدی: درصد حذف فسفر، 

 

چکیده    موضوع این مقاله حذف فسفر از فاضلاب صنایع لبنی در شرایط همزمان هوازی – بی هوازی است. سیستم رآکتور ناپیوسته حاوی گرانول های لجن تحت شرایط متغییر هوازی و بی هوازی می باشد. به منظور بررسی فرآیند تصفیه چهار فاکتور مهم جامدات معلق در محلول (MLSS)، نسبت اکسیژن خواهی شیمیایی در محلول به مقدار نیتروژن محلول(COD/N ratio)، زمان هوادهی و مدت زمان چرخه تصفیه موردنظر بودند. تاثیر چهار متغییر وابسته بر روی فاکتورهای ذکر شده در نرم افزار DOE با روش جذب سطحی (RSM) با استفاده از نقاط مرکزی (CCD) طراحی و در آزمایشات استفاده شدند. درصد حذف PO43- ، مقدار SVI ، MLSS و MLVSS در آزمایشات ناپیوسته به ترتیب 34/98% ، 03/44 ، mg/l 97/5646 و mg/l 99/4435 به دست آمدند. این مطالعه نشان داد که درصد بالای حذف فسفر از فاضلاب صنایع لبنی با استفاده از گرانول های میکروبی فعال تحت شرایط متغییر هوازی بی هوازی به طور موفقییا آمیزی در سیستم تصفیه ناپیوسته قابل انجام است.

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