TAILIEUCHUNG - An executive review of sludge pretreatment techniques

Anaerobic digestion of sludge has been an efficient and sustainable technology for sludge treatment but the low microbial conversion rate of its first stage requires sludge pretreatment, such as biological (aerobic, anaerobic conditions), thermal, mechanical (ultrasonication, lysiscentrifuge, liquid shear, grinding), and chemical (oxidation, alkali, acidic pretreatment, etc.) techniques. This work aims at presenting a review and a short comparison of these common sludge pretreatment techniques, serving the selection of the most suitable technique for lab scale research and for subsequent actual application. | Tạp chí Khoa học và Công nghệ 52 1 2014 1-34 AN EXECUTIVE REVIEW OF SLUDGE PRETREATMENT TECHNIQUES Le Ngoc Tuan1. Pham Ngoc Chau2 University of Science - Vietnam National University Ho Chi Minh city 227Nguyen Van Cu Ward 4 District 5 HCM City 2Bangkok University - Thailand Rama 4 Road Klong-Toey Bangkok 10110 Thailand Email lntuan@hcmus. edu. vn Received 26 April 2013 Accepted for publication 15 January 2014 ABSTRACT Anaerobic digestion of sludge has been an efficient and sustainable technology for sludge treatment but the low microbial conversion rate of its first stage requires sludge pretreatment such as biological aerobic anaerobic conditions thermal mechanical ultrasonication lysiscentrifuge liquid shear grinding and chemical oxidation alkali acidic pretreatment etc. techniques. This work aims at presenting a review and a short comparison of these common sludge pretreatment techniques serving the selection of the most suitable technique for lab scale research and for subsequent actual application. Keywords anaerobic digestion waste activated sludge sludge pretreatment biological pretreatment thermal pretreatment 1. INTRODUCTION Sludge treatment aims at removing organic materials and water consequently reduces the volume and mass of sludge and degradable materials and then odors and pathogens. Incineration ocean discharge land application and composting are the common sludge treatments used over the years but no longer sustainable due to the economic difficulties and their negative impacts on environment. Therefore anaerobic digestion AD of sludge has applied as the efficient and sustainable technology for sludge treatment thanks to mass reduction odor removal pathogen decrease less energy use and energy recovery in form of methane. However the low rate of microbial conversion in the hydrolysis stage the first stage of AD process requires the pretreatment of sludge that ruptures the cell wall and facilitates the release of intracellular matter into the aqueous

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