Effect of Ultrasound Field on Dewatering of Sewage Sludge

Abstract

Abstract:The paper presents the investigations aimed at the determination of the effect of time and wavelength of ultrasound fi eld on the value of capillary suction time (CST), sludge thickening and dry matter of the excess sludge subjected to the process of stabilization.The investigations were carried out on the excess sludge which comes from communal waste treatment plant. The sludge was exposed to ultrasound fi eld, using ultrasound generator with power of 1500 W, frequency of 20 kHz and amplitude 39.42 μm (which corresponded to the amplitude of 100%). Sonication of the sludge was carried out for different amplitudes and sonication times. The non-conditioned sludge and the sludge initially conditioned with ultrasound fi eld were subjected to the process of stabilization in laboratory fl asks (V = 0.5 dm 3 ) for the period of 10 days. On each day, sludge thickening and dewatering capacities were determined.The sludge subjected to the effect of ultrasound fi eld exhibited elevated levels of CST. However, the sonication time had positive effect on the increase in the degree of thickening for each of the amplitudes studied. Also, the process of stabilization positively affected fi nal thickening and dewatering of the sludge.

Transfer Reservoir as a Rainwater Drainage System

“…Rozwój cywilizacji spowodował, iż ośrodki miejskie pozbawione zostały naturalnej retencji zwłaszcza w odniesieniu do ścieków pochodzących z opadów atmosferycznych. Istniejące systemy kanalizacyjne w większości przypadków nie są w stanie odprowadzić ścieków o dużym natężeniu przepływu i dlatego podejmowane są różnego rodzaju zabiegi techniczne [Wolski i in. 2012, Zawilski 1997, zmierzające do przechwycenia i czasowego zatrzymania tej nadwyżki przepływu.…”

The use of power ultrasound in biofuel production, bioremediation, and other applications

“…For instance, Wolski and colleagues demonstrated the dewaterability of sludge coming from a communal waste treatment plant (Wolski and Zawieja, 2012). For instance, Wolski and colleagues demonstrated the dewaterability of sludge coming from a communal waste treatment plant (Wolski and Zawieja, 2012).…”

Biogas Production from Excess Sludge Oxidized with Peracetic Acid (PAA)

“…According to literature data, chemical methods lead to oxidation and dissolution of organic compounds contained in sludge [2,3]. The application of pretreatment before anaerobic stabilization not only accelerates hydrolysis but also improves sludge susceptibility to biodegradation and dewatering, limits its foaming, and reduces the content of pathogens present in the sludge [4][5][6][7][8][9][10][11]. According to Sridhar Pilli et al [12], the rate of biogas production is directly proportional to the sludge liquefaction factor.…”