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Diffuser (sewage)

About: Diffuser (sewage) is a research topic. Over the lifetime, 6487 publications have been published within this topic receiving 40404 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, the authors established the mechanistic link between biofilm DNA concentration and reduced aeration efficiency caused by biofilm fouling, and showed quantitatively the causal connection between bacterial fouling and energy wastage during aeration.
Abstract: Aeration is commonly identified as the most significant energy use in the treatment of wastewater and therefore garners significant focus in reducing energy use in the ultimate aspirational goal of achieving net energy neutrality for water resource recovery. This research establishes the mechanistic link between biofilm DNA concentration and reduced aeration efficiency caused by biofilm fouling. Although the connection between biofilm growth and fouling has been implicit in discussions of diffuser fouling for many years, this research provides directly measured evidence of the connection between biofouling and reduced diffuser efficiency. This was clearly established by studying systematically the evolution of aeration diffusers' efficiency over time, concurrently with the biological study of the biofilm fouling the diffusers in order to understand the major factors contributing to diffuser fouling. While all diffusers foul eventually, some novel materials exhibited fouling resistance. Fouling mitigation techniques, such as chemical cleaning and membrane reverse-flexing were studied. However, during the course of this study the research could not conclude that these techniques were always effective in curbing effects of fouling. By linking bacterial growth with aeration efficiency and calculating the aeration process energy requirements from the latter, the research was able to show quantitatively the causal connection between bacterial fouling and energy wastage during aeration. The methodology applied here can be extended to perform parallel tests during the initial phases of aeration design to yield site-specific data that increase the robustness of design. Fine-pore diffused aeration is the most commonly used aeration system for new activated sludge treatment processes due to its high oxygen transfer efficiency. However, fouling of finepore diffusers has the double-negative effect of greatly diminishing their oxygen transfer efficiency and increasing the back-pressure on the blower, which decreases its operating efficiency. Development of a fundamental understanding of the science of fouling and its impact on fine-pore diffusers facilitates the development of mitigation strategies and guidelines. Overall, application of the findings of this research will result in reduced energy usage at water resource recovery facilities (WRRFs) that will enable them to close the gap between energy use and energy generation to ultimately reach the goal of energy neutrality. This title belongs to WERF Research Report Series ISBN: 9781780406794 (eBook)

14 citations

Journal ArticleDOI
TL;DR: In this article, the application of Palladium membrane diffuser to the blanket sweep gas condition is discussed based on DEMO2001 conditions, and the counter flow may be the most opportune flow type for the Pd diffuser.

14 citations

Patent
30 Oct 2007
TL;DR: In this article, an exhaust diffuser is disclosed for coupling to an exhaust system of a vehicle that, when in one orientation, is designed to exhaust gasses laterally and downwardly from the exhaust manifold.
Abstract: An exhaust diffuser is disclosed for coupling to an exhaust system of a vehicle that, when in one orientation, is designed to exhaust gasses laterally and downwardly from the exhaust diffuser.

14 citations

Patent
Steve Roby1
22 Aug 2003
TL;DR: An improved method for manufacturing a vaned diffuser of a turbocharger, preferably from aluminum or an aluminum alloy, is presented in this article, where the vaned diffusion possesses at least one axis ( 115 ) suitable for separating the diffuser from its rigid mold by translation.
Abstract: An improved method for manufacturing a vaned diffuser ( 101 ) of a turbocharger, preferably from aluminum or an aluminum alloy, where the vaned diffuser possesses at least one axis ( 115 ) suitable for separating the vaned diffuser from its rigid mold by translation. Casting of a raw vaned diffuser ( 407 ) having an optional central hub ( 205 ) and, optionally, ribs on the hub ( 209 ), is disclosed in a plaster mold ( 305 ). The hub and optional ribs are machine finished from the raw vaned diffuser to yield the finished vaned diffuser ( 101 ). The method provides the high degree of dimensional accuracy, and high quality surface finish, required to produce a vaned diffuser of an efficient turbocharger.

14 citations


Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20223
2021132
2020255
2019277
2018261
2017242