Abstract




 
   

IJE TRANSACTIONS B: Applications - Special Issue - Sustainable Technologies for Water and Environment; Guest Editor Prof. Dr. Ahmad Fauzi Ismail and Associate Guest Editor Dr. Lau Woei Jye, Universiti Teknologi Malaysia (UTM), Malaysia
Vol. 31, No. 8 (August 2018) 1437-1445    Article in Press

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  INFLUENCE OF PARTICLE SIZE AND PRESSURE DROP IN CAKE FILTRATION PROCESS ON REMOVAL OF SUSPENDED SOLIDS IN ANAEROBICALLY DIGESTED PALM OIL MILL EFFLUENT
 
W. L. Ang, N. S. Zafisah, A. W. Mohammad and N. Hilal
 
( Received: December 12, 2017 – Accepted: February 08, 2018 )
 
 

Abstract    Palm oil mill effluent (POME) poses a great threat to the environment. However, it contains valuable resources such as energy, water and nutrients that could be recovered for sustainable development. Currently, anaerobic digester has been employed to recover the energy potential in POME. However, the presence of suspended solids in the digestate hinders the downstream nutrients recovery process. In that light, cake filtration process appears to be an attractive option for the removal of suspended solids in the digestate. Hence, this paper studied the performance of cake filtration in removing suspended solids at different pressure condition and particle size of perlite. The effectiveness of cake filtration process was evaluated based on the quality of filtrate (turbidity and total suspended solids (TSS)) and filtration flux. In this study, perlites of different particle size distribution (FP3, FW6, FW20, and FW50) were used as both precoat and body feed. The amount of precoat and body feed were chosen as 1 g each. The filtration process was carried out at different pressure condition (2 – 5 bar). It was found that perlite with the finest particle size (FP3) achieved up to 90% of turbidity and TSS removal due to the formation of more compact cake filtration layer. On the other hand, larger perlite FW50 recorded lowest removal efficiency due to its porous cake layer, though this resulted in higher filtration flux. Generally, the increase in pressure drop resulted in higher flux but at the same time led to drastic initial flux decline due to the quick cover up of filtration voids. The outcomes from this study show that it is wise to consider the effect of particle size distribution and pressure drop in order to achieve high clarity of filtrate as well as high filtration flux.

 

Keywords    palm oil mill effluent, cake filtration, suspended solids, perlite, anaerobic digestate

 

چکیده   

فاضلاب صنایع روغن پالم (POME)تهدید بزرگی برای محیط زیست به شمار می آید. با این حال، این نوع فاضلاب حاوی منابع ارزشمندی مانند انرژی، آب و مواد مغذی است که می تواند برای توسعه پایدار مورد بازیافت قرار گیرند. در حال حاضر، هضم بی‌هوازی برای بازیافت انرژی موجود ذخیره شده در فاضلاب روغن پالم مورد استفاده قرار می گیرد . با این حال، حضور مواد جامد معلق در فاضلاب هضم شده مانع بازیافت مواد مغذی توسط صنایع پایین‌دستی می شود. با در نظر گرفتن اين نکته، فرایند فیلتراسیون کیک گزینه مناسبی برای حذف مواد جامد معلق در فاضلاب هضم شده به نظر می رسد. از این رو، در این مقاله عملکرد کیک فیلتر در حذف مواد جامد معلق در فشار های مختلف و اندازه مختلف ذرات پرلایت مورد بررسی قرار گرفت. اثربخشی فرایند تصفیه کیک بر اساس کیفیت فیلتراسیون )کدورت و مواد جامد معلق کل TSS (و شار فیلتراسیون بررسی شده است. در اين مطالعه پرلیت با اندازه ذره هاي مختلف (FP3، FW6، FW20وFW50) به صورت بادی فید و فیلتراسیون پری-کت مورد استفاده قرار گرفتند. مقدار بادی فید و پری-کت 1 گرم انتخاب شد. فرایند تصفیه در فشار های مختلف ( 2تا5 بار) انجام شد. نتایج بدست امده نشان داد که پرلیت با کوچکترین اندازه ذرات (FP3) به علت تشکیل لایه فیلتراسیون کیک متراکم تر موفق به حذف كدورت ومواد جامد معلق تا ۹۰ درصد شدند. از سوی دیگر، پرلیت با اندازه ذرات بزرگتر FW50 کمترین راندمان حذف رابه علت تشکیل لایه کیک متخلخل نشان دادند، هرچند تشکیل لایه کیک متخلخل موجب افزایش شار فیلتراسیون می شود. به طور کلی، افزایش فشار موجب افزایش شار شد، اما در عین حال باعث کاهش شدید شار اصلی به دلیل پوشش سریع حفره های تصفیه شده است. نتایج حاصل از این تحقیق نشان می دهد که در نظر داشتن اثر توزیع اندازه ذرات و افت فشار برای دستیابی به فیلتراسیون با کیفیت و همچنین شار بالا، اهمیت دارد.

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