Tech Bulletins

The proper design, operation, and maintenance of biological wastewater treatment and aeration systems is critical to plant performance and operating efficiency. Click to view or download the desired technical bulletins for additional information. Click here for our Tech Bulletins in Chinese.

#143 Effects of Temperature on Aeration Piping — Air temperature must be considered in all aeration piping designs.
#144 Air Volume Conversions — Air conditions are based on accepted standard conditions with standardized procedures.
#142 Membrane Pore Size Selection — The size of the opening and how openings are distributed over the surface of the membrane significantly impact the performance of the membrane.
#140 Proper Specifications for Diffuser Units — Items to consider in selecting an aeration system
#135 General Oxygen Requirements for Wastewater Treatment— Guidelines to estimate how much oxygen is required for proper biological system performance.
#133 Myths About Diffuser Design— Common misconceptions in diffuser design and performance
#131 System Design Air Flow— How to size a blower to deliver the desired airflow to the aeration system.
#129 Conversion Chart for Upgrading Systems— Guidelines to determine available operating cost savings for several types of aeration systems.
#126 Economic Analysis of Diffuser Aeration Systems— Methodology to evaluate capital and operating costs in assessing aeration technologies.
#123 Retrievable Diffuser Aeration Systems— Retrievable aeration systems that can be installed and maintained without taking the reactor out of service.
#120 EDI's Commitment to Quality— General information on the quality programs at EDI.
#107 Shallow Applications— Design considerations for shallow depth applications.
#101 Proper Design Considerations— Items to consider in selecting a diffuser technology and designing an aeration system.
#106 Converting Ceramic Disc/Dome Media to Flexible Membrane— Information on the benefits and procedures for converting ceramic media to flexible membranes.
# 102 Evaluating Your Membrane Supplier— Areas to evaluate in specifying replacement membranes.
#119 Diffuser Membrane Sizing and Ordering— Information on how to select the proper replacement membrane
#108 Review of On/Off Operation— Design considerations for intermittent aeration applications.
#110 Membrane Life Expectancy— Factors that impact membrane life and performance.
#109 Diffuser Unit Fouling and Cleaning—Typical fouling issues and recommended cleaning procedures.
#111 Tips for Replacing Units and Membranes—Installation guidelines for replacing diffuser membranes and diffuser units
#114 Diffuser Membrane Material Selection Guide—Information on EPDM, polyurethane, silicone, nitrile, and neoprene membrane materials. Includes general material property and application guidelines.
#112 Importance of airflow and air in system design— Matching blower and aeration components for proper performance.
#136 Design Pressure Considerations for Multi-Stage Centrifugal Blowers—Operating and pressure considerations when using multi-stage centrifugal blowers.
#134 Factors that Influence Air Requirements to Treat Wastewater— Design factors that impact the performance of diffuser systems under field operating conditions.
#132 Mixing Requirements for Diffused Air Systems—How to size a diffused aeration system for biological solids suspension.
#130 Handy Conversion Factors—Common conversion factors used in wastewater treatment and aeration system design.
#127 Typical Performance—Information on oxygen transfer efficiency performance and energy consumption for various aeration technologies.
#125 Calcium Carbonate Fouling— Information on calcium carbonate fouling, the impact of fouling on various types of diffusers, and available cleaning procedures.
#121 Technical Support for Your Aeration System— Design assistance available from EDI’s and design request form.
#117 Information About Fine Bubble Diffuser Systems—Information on bubble size and aeration efficiency for coarse and fine bubble diffusers.
#141 Installation and Maintenance Cost Evaluation— Information on the installation and maintenance requirements for tube, disc and panel fine bubble diffuser systems.
#104 Fine Bubble Aeration—When to use fine bubble diffusers and tips for optimizing system performance.
#103 Coarse Bubble Aeration— Effective applications for coarse bubble diffusers.
#105 Converting Coarse Bubble Aeration to Fine Bubble— Benefits and techniques for successful conversion of coarse bubble systems.
#115 Lake and Pond Aeration Techniques— Beneficial uses of diffused aeration systems in lakes and ponds.
#116 Aquaculture Applications— Beneficial uses of diffused aeration systems in lakes and ponds.
#118 Spray Cooling— Application guidelines for EDI’s XOTherm floating spray cooler system.
#122 Fixed Grid Systems—Designs options for aerating concrete and steel tanks with EDI’s fixed grid diffuser systems.
#124 Floating Diffuser Systems— Application guidelines for EDI’s floating lateral diffused aeration systems.
#113 Can more than one unit type be used in the same system?— Design considerations and information on combined coarse bubble and fine bubble system.
#138 Membrane Element Structural Analysis—Membrane stress calculations and how the mechanical design of the membrane element can influence operating flexibility and diffuser service life.

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