Process optimization of an ultrasonic technology combining a CASS reactor for excess sludge minimization

2017 ◽  
Vol 82 ◽  
pp. 57-66 ◽  
Author(s):  
Feng Gao ◽  
Jun Nan ◽  
Tianhao Wu
Keyword(s):  
Process Optimization ◽  
Excess Sludge ◽  
Ultrasonic Technology ◽  
Sludge Minimization

Ultrasound Enhanced Biomass Energy Conversion Technology of Excess Sludge

2011 ◽  
Vol 356-360 ◽  
pp. 1914-1918
Author(s):  
Yi Xin Yan ◽  
Jian Lei Gao ◽  
Jian Ping Wu
Keyword(s):  
Wastewater Treatment ◽  
Anaerobic Digestion ◽  
Wastewater Treatment Plants ◽  
Biomass Conversion ◽  
Biomass Energy ◽  
Excess Sludge ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Ultrasonic Technology ◽  
Research Situation

The excess sludge from wastewater treatment plants can be converted to methane or hydrogen through appropriate anaerobic digestion process, which is an effective way to prevent pollution and recover biomass energy. However, the lower conversion rate that results in long residence time and large digester volume limits its application. The ultrasonic technology can be applied to effectively improve the biomass conversion of excess sludege during anaerobic digestion process. In this review, the mechanism and main influencing factors of ultrasonic enhancement were summarized, and the current research situation and future development were presented as well.

Valuation of OSA process and folic acid addition as excess sludge minimization alternatives applied in the activated sludge process

2015 ◽  
Vol 73 (4) ◽  
pp. 734-739 ◽  
Author(s):  
C. L. Martins ◽  
V. F. Velho ◽  
S. R. A. Ramos ◽  
A. S. C. D. Pires ◽  
E. C. N. F. A. Duarte ◽  
...  
Keyword(s):  
Folic Acid ◽  
Activated Sludge ◽  
Effluent Treatment ◽  
Activated Sludge Process ◽  
Excess Sludge ◽  
Control Phase ◽  
Activated Sludge System ◽  
Acid Addition ◽  
Sludge Minimization ◽  
Sludge Production

The aim of this study was to investigate the ability of the oxic-settling-anaerobic (OSA)-process and the folic acid addition applied in the activated sludge process to reduce the excess sludge production. The study was monitored during two distinct periods: activated sludge system with OSA-process, and activated sludge system with folic acid addition. The observed sludge yields (Yobs) were 0.30 and 0.08 kgTSS kg–1 chemical oxygen demand (COD), control phase and OSA-process (period 1); 0.33 and 0.18 kgTSS kg–1 COD, control phase and folic acid addition (period 2). The Yobs decreased by 73 and 45% in phases with the OSA-process and folic acid addition, respectively, compared with the control phases. The sludge minimization alternatives result in a decrease in excess sludge production, without negatively affecting the performance of the effluent treatment.

Combination of the OSA process with thermal treatment at moderate temperature for excess sludge minimization

2020 ◽  
Vol 300 ◽  
pp. 122679
Author(s):  
Santo Fabio Corsino ◽  
Marco Capodici ◽  
Daniele Di Trapani ◽  
Michele Torregrossa ◽  
Gaspare Viviani
Keyword(s):  
Thermal Treatment ◽  
Moderate Temperature ◽  
Excess Sludge ◽  
Sludge Minimization
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