Industrial Utility Efficiency    

Magazine

September 2015 Edition

September 2015 Edition

Featured Articles

Turbo Blowers Generate Energy Savings at Victor Valley Wastewater

The Victor Valley Wastewater Reclamation Authority (Victorville, California), operates one wastewater treatment plant using an activated sludge process to treat approximately 13 million gallons of sewage per day. The plant operates 24 hours a day and was equipped with two, 500-hp centrifugal blowers serving the secondary phase of the activated sludge treatment process in which 3,000 to 8,700 scfm of 8 psig air was supplied to the bacteria breaking down organic waste. This Issue features an article, provided by the U.S. Department of Energy’s Advanced Manufacturing Office Better Plants program, describing how a blower replacement project yielded annual energy savings of more than 928,000 kWh and $98,000 in energy costs.

Read the full article here.

PTFE Membrane Bubble Diffusers Reduce Demand on Aeration Blowers

The largest demand component for low-pressure air, at a wastewater treatment plant (WWTP), is the fine bubble diffuser system. Aeration tanks use bubble diffusers, normally featuring membranes allowing airflow to pass from the piping into the wastewater. Stamford Scientific has developed and patented multiple advance membrane technologies. “As a membrane fouls and loses its initial shape, many plant operators find they need to increase the airflow rate of their blowers to overcome the fouling on the membrane and achieve the same oxygen transfer rates,” writes Stamford’s Doreen Tresca. Stamford patented PTFE membrane diffusers grace the cover of our magazine this month and we hope you enjoy her article detailing how their membranes help reduce aeration blower demand.

Read the full article here.

Pneumatic Control in Modular Wastewater Treatment Plants

How does this 7 to 8 psi air reach the diffusers? Craig Correa, the Head of Process Automation at Festo Corporation, told our own Clinton Shaffer how pneumatic control works in a wastewater treatment plant. “30 percent of facilities use pneumatic control technology. In those projects, firms like Evoqua, Pall and GE Water build skids that use compressed air as the working medium to control and automate the influent and effluent of the WWTP. Low-pressure compressed air (at least 60 psi or 4 bar) is used throughout the instrumentation, valving, sensors, and even the filter membranes.”

Read the full article here.

What To Expect from an Effective Compressed Air Audit

We turn back to compressed air with an article from Don Van Ormer, from Air Power USA, saying auditors have “sprung up like dandelions!” Given this fact and the widely varying audit results factories are experiencing, this article provides an excellent checklist of questions an effective audit should answer.

Read the full article here.

Variable Inlet Guide Vanes Boost Centrifugal Air Compressor Efficiency

Variable inlet guide vanes (IGV) can have a significant impact on the energy efficiency of centrifugal air compressors. We were able to catch up with Rick Stasyshan, the Compressed Air and Gas Institute’s (CAGI) Technical Consultant, and John Kassin of Cameron to discuss this topic. They said many manufacturers now offer retrofit options, “Replacing a standard inlet butterfly valve with a new inlet guide vane assembly, can generate energy savings up to 9 percent whenever the compressor operates at less than full load or when ambient air temperature is less than design temperature (usually 95°F, 35°C).”

Read the full article here.

Show Report: Compressed Air at the NPE 2015 Plastics Showcase

The plastics industry is the 4th largest in the U.S. It's a major user of blower air and compressed air at many different pressure levels. The plastics industry is vigorously exploring how to use less material and be more sustainable. This is driving change in blow molding air requirements. We visited the booths of the following companies and wrote up what we learned; SIDE PET blow molding machines, Mid-America Machining rotational molds, Negri Bossi injection molding machines, Bauer Compressors Plastics Technology Group, Gardner Denver Bellis & Morcom, Kaeser Compressors, Atlas Copco, AF Compressors and the Hitachi Air Technology Group.

Read the full article here.

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