Excess sludge reduction using ultrasonic waves in biological wastewater treatment

Desalination ◽  
2011 ◽  
Vol 275 (1-3) ◽  
pp. 67-73 ◽  
Author(s):  
Ahmad Reza Mohammadi ◽  
Nasser Mehrdadi ◽  
Gholamreza Nabi Bidhendi ◽  
Ali Torabian
Keyword(s):  
Wastewater Treatment ◽  
Ultrasonic Waves ◽  
Biological Wastewater Treatment ◽  
Sludge Reduction ◽  
Excess Sludge ◽  
Excess Sludge Reduction

scholarly journals In situ excess sludge reduction in SBBR through uncoupling of metabolism induced by novel aeration modes

RSC Advances ◽  
2017 ◽  
Vol 7 (46) ◽  
pp. 29058-29064 ◽  
Author(s):  
Benzhou Gong ◽  
Yingmu Wang ◽  
Jiale Wang ◽  
Yanyan Dou ◽  
Jian Zhou
Keyword(s):  
Wastewater Treatment ◽  
Sludge Reduction ◽  
Excess Sludge ◽  
Triangular Wave ◽  
Square Wave ◽  
Sawtooth Wave ◽  
Bench Scale ◽  
Biofilm Reactors ◽  
Excess Sludge Reduction

To minimize sludge yield (Yobs) in bench-scale sequencing batch biofilm reactors (SBBRs) during wastewater treatment, novel aeration modes were employed: triangular-wave aeration, square-wave aeration, sawtooth-wave aeration and continuous aeration.

Progress and Perspectives of Microfauna as a Powerful Method for Excess Sludge Reduction in Wastewater Treatment

2012 ◽  
Vol 446-449 ◽  
pp. 2824-2828 ◽  
Author(s):  
Li Min Zhao ◽  
Sen Wen
Keyword(s):  
Wastewater Treatment ◽  
Environmental Economic ◽  
Sewage Sludge ◽  
Operating Conditions ◽  
Sludge Reduction ◽  
Powerful Method ◽  
Excess Sludge ◽  
Excess Sludge Reduction

Disposal of sewage sludge by environmentally acceptable means is a serious problem, due to environmental, economic, social and legal factors. This paper presents an overview of the potential of the application of the microfauna, such as the aquatic worms and the earthworms in excess sludge reduction in wastewater treatment. Significant sludge reduction was achieved in the presence of the aquatic worms or the earthworms. Additionally, the effect of operating conditions on the excess sludge reduction by the aquatic worms and the earthworms are also presented.

scholarly journals Excess Sludge Reduction and Biomass Characteristics in Swim-Bed Wastewater Treatment Process

2007 ◽  
Vol 43 (2) ◽  
pp. 73-82
Author(s):  
YINGJUN CHENG ◽  
DAISUKE YAZAKI ◽  
SEN QIAO ◽  
YUSUKE WATANABE ◽  
TOICHIRO KOYAMA ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Treatment Process ◽  
Sludge Reduction ◽  
Excess Sludge ◽  
Wastewater Treatment Process ◽  
Excess Sludge Reduction

Evaluation of Sludge Reduction Mechanisms in ‘Sonolysis-Cryptic Growth’ Wastewater Treatment System

2015 ◽  
Vol 768 ◽  
pp. 108-115
Author(s):  
Pan Yue Zhang ◽  
Tian Wan ◽  
Guang Ming Zhang
Keyword(s):  
Wastewater Treatment ◽  
Organic Load ◽  
Sludge Reduction ◽  
Excess Sludge ◽  
Operation Condition ◽  
Reduction Mechanisms ◽  
Residual Sludge ◽  
Cryptic Growth ◽  
Load Increase

‘Sonication - cryptic growth’ technology can reduce 30-80% excess sludge in wastewater treatment systems. Various mechanisms contribute to the sludge reduction but the role of each one is unclear. This paper quantitatively studied the potential mechanisms in ‘sonication - cryptic growth’. The operation condition was: every day 20% sludge was sonicated under 1.2 Wml-1 for 15 min and then returned to the wastewater treatment reactor for cryptic growth. The results showed that under such conditions, ‘sonication - cryptic growth’ reduced the excess sludge by 57.3% and the effluent met the national discharge standard. Multiple mechanisms were involved in the process. Detailed analysis showed that the ‘lysis-cryptic growth’ mechanism was the most important one and accounted for 49.1% of sludge reduction. Biodegradation of residual sludge was the second important one and contributed 19.5%. Other potential mechanisms included the altered microbial community, longer sludge retention time, and accumulation of persistent materials. But organic load increase had virtually no impact.

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