Experimental study on aeration efficiency in a pilot‐scale decelerated oxidation ditch equipped with fine bubble diffusers and impellers

2020 ◽  
Author(s):  
Xiaofei Xu ◽  
Wenze Wei ◽  
Fengxia Liu ◽  
Wei Wei ◽  
Zhijun Liu
Keyword(s):  
Experimental Study ◽  
Pilot Scale ◽  
Oxidation Ditch ◽  
Fine Bubble ◽  
Aeration Efficiency ◽  
Bubble Diffusers

scholarly journals Three decades of oxygen transfer tests in clean water in a pilot scale test tank with fine-bubble diffusers and the resulting conclusions for WWTP operation

2020 ◽  
Vol 15 (4) ◽  
pp. 910-920
Author(s):  
J. Behnisch ◽  
M. Schwarz ◽  
M. Wagner
Keyword(s):  
Oxygen Transfer ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
Pilot Scale ◽  
Transfer Efficiency ◽  
Clean Water ◽  
Test Tank ◽  
Fine Bubble ◽  
Oxygen Transfer Efficiency ◽  
Bubble Diffusers

Abstract We summarized the experience from three decades of oxygen transfer testing and aeration research at the Technical University of Darmstadt to validate the oxygen transfer efficiency of modern fine-bubble diffusers. A total of 306 oxygen transfer tests in clean water of 65 different fine-bubble diffusers, carried out in the same test tank under identical test conditions, were analysed and compared with previous results. As a result, we could show that the performance of fine-bubble aeration systems has increased by 17% over the last three decades. Therefore, modern well-designed and operated aeration systems can achieve specific standard oxygen transfer efficiency (SSOTE) values between 8.5 and 9.8% · m−1. Additionally, a comparison of various diffuser types and diffuser densities was done. Based on the new results, an exemplary cost/benefit analysis for a 100,000 PE WWTP shows the calculation of an optimized diffuser density with respect to investment and operating costs.

Experimental Study on Utilization FGD Byproducts in Building Bricks

2010 ◽  
Vol 150-151 ◽  
pp. 753-757 ◽  
Author(s):  
Xiong Hao Li ◽  
Yong Jie Xue ◽  
Min Zhou
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Optimum Design ◽  
Power Plants ◽  
Pilot Scale ◽  
Mixture Composition ◽  
Technical Requirement ◽  
Do No Harm ◽  
Maximum Compressive Strength ◽  
Scale Experiment

This paper discussed the feasibility of unburned and non-autoclaved, steam cured bricks prepared by FGD byproducts from coal-fired power plants. The results show that FGD byproduct, aggregates, cementious materials and water could be used to prepare bricks during the process of stir and compaction under natural cure and steam cured condition. S4 and Z2 are the optimum design mixture composition. The maximum compressive strength and saturation coefficient are 28.7 MPa and 96.7%. FGD byproducts do no harm to environment and a pilot-scale experiment demonstrates that bricks made with FGDA can meet the MU10 level bricks technical requirement.

Energy saving in activated sludge plants by the use of more efficient fine bubble diffusers

2010 ◽  
Vol 24 (1) ◽  
pp. 58-64 ◽  
Author(s):  
Martin Jolly ◽  
Steve Green ◽  
Cindy Wallis-Lage ◽  
Annelle Buchanan
Keyword(s):  
Activated Sludge ◽  
Energy Saving ◽  
Fine Bubble ◽  
Bubble Diffusers
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