tailieunhanh - Executive review of hydrostatic pressure effects on sludge pretreatment by sonication
Related to ultrasonic (US) pretreatment of sludge, changing the hydrostatic pressure will change the resonance condition of cavitation bubbles and then may drive the system toward resonance conditions, consequently increase the rate and yield of reactions. | Tạp chí Khoa học và Công nghệ 54 (1) (2016) 64-73 EXECUTIVE REVIEW OF HYDROSTATIC PRESSURE EFFECTS ON SLUDGE PRETREATMENT BY SONICATION Ngoc Tuan Le1, 2, *, Carine JULCOUR-LEBIGUE2, Henri DELMAS2 1 University of Science, VNU-HCM City, 227 Nguyen Van Cu, Ward 4, Dist. 5, HoChiMinh City, Vietnam 2 Université de Toulouse, Laboratoire de Génie Chimique, INP-ENSIACET, 31030 Toulouse, France * Email: lntuan@, Received: 26 December 2014; Accepted for publication: 30 September 2015 ABSTRACT Related to ultrasonic (US) pretreatment of sludge, changing the hydrostatic pressure will change the resonance condition of cavitation bubbles and then may drive the system toward resonance conditions, consequently increase the rate and yield of reactions. Nevertheless, nearly all the US experiments had been carried out at atmospheric pressure. Only a few studies had been focusing on how increasing static pressure affects cavitation. The effect of hydrostatic pressure on sludge disintegration was studied for the first time in the last few years. This work aimed at reviewing the effect of pressure on sludge ultrasonic pretreatment efficiency in different conditions. The major result was that the optimum pressure depends on power input PUS, intensity -IUS (or probe size), and temperature -T, but not on specific energy input -ES, frequency -FS, nor sludge type. In general, sludge disintegration efficacy was significantly improved by sonication at the optimum pressure, especially at low ES, leading to a potential of energy input savings in sludge sonication pretreatment, but also in most of ultrasound assisted processes. Keywords: hydrostatic pressure, sludge disintegration, sludge pretreatment, sonication, ultrasonic pretreatment, waste activated sludge 1. INTRODUCTION Despite ultrasonic (US) sludge treatment has reached commercial developments and given rise to many works, and hydrostatic pressure is known as an important parameter, but had .
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