Method for ultrasonic enhanced dewatering of sludge containing algae

By precisely controlling the ultrasonic frequency within the range of 20kHz to 40kHz to pretreat algae-containing sludge, the problem of unstable dewatering caused by the blindness of parameters in the existing technology is solved, achieving efficient and controllable dewatering effect and reducing energy consumption.

CN122301440APending Publication Date: 2026-06-30TONGJI UNIV
View PDF 2 Cites 0 Cited by

Patent Information

Application Number
CN202610439661.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-03
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing ultrasonic pretreatment technology suffers from blind selection of parameters, resulting in unstable dewatering effect of algae-containing sludge and may also cause cell pulverization or blockage of filter cake pores, increasing energy consumption.

Method used

Pretreatment of algae-containing sludge is carried out by precisely controlling the ultrasonic frequency in the range of 20kHz to 40kHz, with a preferred frequency of 28kHz to 36kHz, and the energy density is controlled within 100J/mL for solid-liquid separation.

Benefits of technology

It significantly reduces capillary absorption time (CST), improves dehydration performance, achieves predictable and controllable dehydration effects, avoids cell disruption, and reduces energy consumption.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122301440A_ABST
    Figure CN122301440A_ABST
Patent Text Reader

Abstract

This invention belongs to the field of water treatment and relates to a method for dewatering algae-containing sludge using ultrasound enhancement. The method includes: conveying the algae-containing sludge to an ultrasonic treatment device, pretreating it with ultrasound waves at a frequency of 20kHz to 40kHz, followed by solid-liquid separation. Within the 20-40kHz range, ultrasound induces "shrinkage-type" damage in algae cells, maximizing dewatering efficiency and significantly reducing capillary absorption time (CST). Once the ultrasonic frequency reaches 40kHz or higher, cell survival rate increases, and dewatering performance deteriorates. This method solves the technical challenge of dewatering algae-containing sludge by precisely controlling the ultrasonic frequency.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Algae in-situ comprehensive treatment system

    CN113636668A

  • Method for improving anaerobic digestion methane production capacity of algae sludge through pretreatment

    CN117401873A