Application of weak ultrasonic treatment on sludge electro-osmosis dewatering

Environmental Technology
Degang MaJun Zhai

Abstract

Ultrasonic treatment is a good method of facilitating sewage sludge dewatering characteristics. It can also promote the potential of sludge electro-osmosis dewatering (EDW), which is an accepted method of deep dewatering, but the treatment method and optimizing conditions should be determined by performing experiments. In this study, we consider two treating methods: ultrasonic pre-treatment, which uses ultrasonic treatment as sludge pre-treatment before electro-osmosis dehydration, and ultrasonic coupling, which uses ultrasonic and electric fields simultaneously. Using sludge from the Tianjin Jizhuangzi sewage treatment plant, we analyze the influence of ultrasonic intensity and treatment time on sludge dewatering by performing two different methods. The results show that they effectively facilitated sludge EDW. Under the same conditions, i.e. 2 cm cake initial thickness, voltage of 60 V for 5 min, and 0.1 MPa mechanical pressure for 5.5 min, the optimum processing conditions for ultrasonic pre-treatment were found to be 0.510 W/cm2 and 3.5 min, the dehydration rate reached 34.71%, and the optimum conditions for ultrasonic coupling were 0.255 W/cm2 and 3.5 min, while the dehydration rate reached 40.78%. The dehydration rates f...Continue Reading

References

Jun 1, 2000·Ultrasonics· Riera-Franco de Sarabia EI Gonzalez-Gomez
Apr 17, 2004·Water Research·Leena SahlströmAnn Albihn
Jun 5, 2004·Journal of Hazardous Materials·Elisabeth NeyensBart De heyder
May 25, 2006·Water Research·Hans SaveynPaul Van der Meeren
Feb 18, 2012·Waste Management·Alexandros Kelessidis, Athanasios S Stasinakis
Jun 28, 2012·Water Research·Mickael RaynaudJean-Christophe Baudez

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Citations

Jun 21, 2021·Environmental Research·Changyuan LiuJiangyan Liu

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