air diffuser Articles
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Accumulated CFC-11 in polyurethane foam insulation: an estimate of the total amount in district heating installations in Sweden
In rigid polyurethane foam used for thermal insulation, CFC-11 has been the main blowing agent for many years, but is now subject to phase-out regulations. During ageing of this foam, air diffuses into it and blowing agents leak into the atmosphere, resulting in a decreased insulating capacity. Determinations of the cell gas composition and the total content of CFC-11 in foam from district ...
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Highly efficient electro-generation of hydrogen peroxide using NCNT/NF/CNT air diffusion electrode for electro-Fenton degradation of p-nitrophenol
To promote the in situ generation of hydrogen peroxide (H2O2) in electro-Fenton system, a new air diffusion electrode (ADE) was put forward in the present work using N-doped multi-walled carbon nanotubes (NCNT) as the catalyst layer, multi-walled carbon nanotubes (CNT) as the diffusion layer, and nickel foam (NF) as the supporting material, respectively. The catalyst layer in ADE was ...
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Integration of nitrification and denitrification by combining anoxic and aerobic conditions in a membrane bioreactor
A membrane bioreactor (MBR) was developed to achieve nitrogen removal by combining nitrification and denitrification conditions in one reactor. The activated sludge was alternated between aerobic and anoxic conditions using peristaltic pump. The biomass concentration and floc morphological properties were observed to be similar in anoxic and aerobic compartments. However, the homogeneous ...
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Second law analysis of compressible flow through a diffuser subjected to constant wall temperature
This study presents the investigation of entropy generation in compressible turbulent flow of air through a diffuser. Constant temperature boundary condition is applied at the wall. Two-dimensional solution of velocity and temperature fields are obtained using the CFD code FLUENT. Regions of high entropy generation in the diffuser have been predicted. The desired inlet expansion angle ...
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Modelling energy costs for different operational strategies of a large water resource recovery facility
The main objective of this paper is to demonstrate the importance of applying dynamic modelling and real energy prices on a full scale water resource recovery facility (WRRF) for the evaluation of control strategies in terms of energy costs with aeration. The Activated Sludge Model No. 1 (ASM1) was coupled with real energy pricing and a power consumption model and applied as a dynamic ...
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Lab Design Basics For Fume Hoods
When designing a laboratory, different stakeholder groups hold differing views. Not to mention, many individuals hold various opinions that have opposing priorities. But once decisions have been made and there is a consensus among the users, designing a lab is an exciting process. A successful lab design layout will promote the use of laboratory space while ensuring safe working conditions for ...
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Floating Lateral Successful Operations
EDI Advanced Technology lagoon aeration systems offer robust solutions for severe weather operations. EDI personnel are continuously asked about operation of our floating lateral systems in cold weather conditions, and in some cases very hot or sunny weather conditions. EDI offers a wide range of Total Lagoon Solutions and we are often asked can your floating lateral systems be successful in ...
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Towards advanced aeration modelling: from blower to bubbles to bulk
Abstract: Aeration is an essential component of aerobic biological wastewater treatment and is the largest energy consumer at most water resource recovery facilities. Most modelling studies neglect the inherent complexity of the aeration systems used. Typically, the blowers, air piping, and diffusers are not modelled in detail, completely mixed reactors in a series are used to represent plug-flow ...
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Towards advanced aeration modelling: from blower to bubbles to bulk
Aeration is an essential component of aerobic biological wastewater treatment and is the largest energy consumer at most water resource recovery facilities. Most modelling studies neglect the inherent complexity of the aeration systems used. Typically, the blowers, air piping, and diffusers are not modelled in detail, completely mixed reactors in a series are used to represent plug-flow ...
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Mcclellan air force base diffusion
Parsons Engineering Science, Inc. (Parsons ES) was retained by the US Air Force Center for Environmental Excellence Technology Transfer Division (AFCEE/ERT) to perform an evaluation of passive groundwater diffusion sampling technology. The diffusion sampler evaluation was funded under Contract F11623-94-D0024, Delivery Order RL72, as part of the AFCEE/ERT Remedial Process Optimization (RPO) ...
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Removal of ammonium ions from wastewater: A short review in development of efficient methods
Ammonium ions wastewater pollution has become one of the most serious environmental problems today. The treatment of ammonium ions is a special concern due to their recalcitrance and persistence in the environment. In recent years, various methods for ammonium ion removal from wastewater have been extensively studied. This paper reviews the current methods that have been used to treat ammonium ...
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Four Factors That Affect A Fume Hood’s Longevity
If you work in a laboratory that deals with dangerous vapors or chemicals, you likely do a large portion of your work inside of a fume hood. A fume hood is a significant but often necessary investment for your lab, so you’ll want to make sure that it lasts. While there are many things that can affect the longevity of your fume hood, we’ll address some of the critical things you’ll want to be ...
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Woodson IL Case Study 33 Year old system
Date of Design: 1973 by Benton & Associates Jacksonville, IL Date of Hinde Engineering Installation: 1974 Design Data: Domestic Waste only Design Flow <0.100 MGD Design Load BOD 200 mg/l ~170 PPD TSS 200 mg/l ~170 PPD 2 Lagoons ~ 2 Acres Total 10’ WD 2’ FB 2 Sand Filters In 1999 ADS converted the original aeration system to Out-of-Water HDPE headers and new aeration diffusers. ...
By EP Aeration
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Fixed activated sludge treatment (FAST®) process technology overview
Biological treatment systems for small communities and even single-family dwellings have been available in the general water pollution control market for many years. These systems are basically scaled-down versions of the activated sludge process, utilizing suspended growth systems. Historically, the main operational problem associated with these systems has been the management of the sludge ...
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A realistic dynamic blower energy consumption model for wastewater applications
At wastewater treatment plants (WWTPs) aeration is the largest energy consumer. This high energy consumption requires an accurate assessment in view of plant optimization. Despite the ever increasing detail in process models, models for energy production still lack detail to enable a global optimization of WWTPs. A new dynamic model for a more accurate prediction of aeration energy costs in ...
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Validation of an operational advanced Gaussian model with the Copenhagen and Kincaid datasets
A practical model for evaluating ground-level concentrations from elevated sources that applies a new Gaussian formulation for transport and vertical diffusion is presented. In the Gaussian formula, the source height is replaced by a virtual source height, which is expressed by simple functions of the vertical profiles of wind and turbulent diffusivity. The performances of the model are evaluated ...
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NOx re-burn simulation in a double-jet counter-flow flame
The paper investigates the main features of NOx emission in a laminar double-jet counter-flow diffusion flame for later use as a possible physical model for NOx reduction through turbine in situ reheat. The oxidizer stream consists of exhaust gas resulted from a conventional combustor and the fuel stream is represented by an air?methane mixture. The main interest rests on the distribution of NOx ...
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Use of biocatalysts to reduce hydrogen sulfide emissions from lagoons and landfills
Emission of odors from ponds and lagoons occurs due to aerobic and anaerobic decomposition of organic solids to release hydrogen sulfide, ammonia, and other organic by-products. Aerobic biodegradation occurs near the water-air interface, where diffusion of oxygen occurs, while anaerobic degradation prevails mainly near the bottom of the pond or lagoon, where there is low or no dissolved oxygen ...
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High Efficiency Diffusers vs. Surface Aerators
Technical Bulletin 162: High Efficiency Diffusers versus Surface Aerators EDI has engineered systems that are well suited for almost any aeration mixing application. With multiple diffuser platforms available, it gives design engineers or users choices for coarse bubble, fine bubble of different types, and several different configurations for the diffuser systems. With this flexibility and ...
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Maximum Air Pressure for Diffusers
In the water and wastewater treatment field there are many needs and/or opportunities to upgrade existing facilities or to construct new facilities where space is limited. The available space can severely constrict the capacity of treatment facilities, or reduce the options available for design and implementation of the treatment process. Some of the needs facing many potential facilities is the ...
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