TAOYi,YUANJian,MAHua-ji,et al.Effects of Ultrasonic Wave on Properties and Quorum Sensing of Sludge in SBR with Low Water Temperature[J].China Water & Wastewater,2024,40(1):76-81.
Effects of Ultrasonic Wave on Properties and Quorum Sensing of Sludge in SBR with Low Water Temperature
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第1期
Page:
76-81
Column:
Date of publication:
2024-01-01
- Abstract:
- This paper established a continuous-flow ultrasonic SBR system for low temperature wastewater treatment, and investigated the effects of ultrasonic wave on the properties and quorum sensing of activated sludge at low temperature. When the wastewater temperature was 15 ℃, the yield coefficient (Yobs) of sludge in the ultrasonic SBR system decreased to 0.306 kgVSS/kgCOD, and the sludge reduction rate (SRE) was 44.77%. Ultrasonic wave did not affect the settling performance of activated sludge and the stability of the system. The sludge volume index (SVI) of the sludge in the system was between 121.2 mL/g and 148.0 mL/g. Stable COD removal performance was obtained, and the effluent COD reached 22 mg/L. The extracellular polymeric substances (EPS) content of activated sludge increased, and the polysaccharide and protein contents increased to 74.71 mg/gMLSS and 29.23 mg/gMLSS, respectively, which increased by 63.2% and 36.8%, respectively. Ultrasonic wave significantly affected the concentration of signal molecules in activated sludge. The concentration of C4-HSL was 0.196 6 μg/L, and the signal molecule content per unit mass of sludge was 0.044 μg/gMLSS, which was 2.56 times and 2.44 times of that of the control reactor, respectively. Ultrasonic wave also resulted in the significant decrease of the concentrations of signal molecules such as C6-HSL, C7-HSL, C8-HSL, C10-HSL, C12-HSL and C14-HSL.
Last Update:
2024-01-01