“Repair or Replace?”

A small town faces the common dilemma of “repair or replace?” and achieves notable operational and energy efficiency gains.  

By: Michael Camber

Traditionally, planning for blower system installations at wastewater treatment plants has been approached very differently than industrial compressed air system design. We have found, however, that applying techniques such as system energy audits and modern controls to blower systems yield similar benefits in terms of identifying energy reduction opportunities. That’s exactly what happened when one of our wastewater sales managers convinced management at a wastewater treatment plant to perform an Air Demand Analysis rather than simply replace aging equipment with newer versions of what they had.

Thinking outside the box and working with the local engineering company, we were able to show the town’s public utility department how they could save energy and then document the actual savings.

See the full case study published in the May 2019 issue of Water & Wastes Digest :

Fixed or Variable? Small town achieves efficiency gains with blower station options
Chapmanville Water Department in Logan County, W.Va., provides the water distribution and wastewater treatment services in the town of Chapmanville, which has a population of 1,200. It wastewater plant processes about 400,000 gal per day (gpd). The town planned a major upgrade for 2019 and 2020, including the replacement of three 40 hp multi-stage centrifugal blowers commissioned 25 years earlier.

At the beginning of 2018, one of these was no longer in service. Chapmanville planners hoped to limp along on the two remaining blowers, but in the spring of 2018, they lost another one. Down to one blower, the planners knew they could not wait for the planned upgrade, and the department had to do something.

Read the full story online here: https://www.wwdmag.com/blowers/fixed-or-variable

The Benefits of Adaptive Control Systems

By: Stephen Horne

In municipal and industrial wastewater treatment, there has been a shift from manual to automatic process control in order to increase efficiency and improve effluent quality. An increasingly popular approach includes installing a variable frequency drive (VFD) to constantly adjust the amount of air injected into the process to control dissolved oxygen, NH4, and/or NO3 in the wastewater treatment.  This approach works well from a process control standpoint. The additional benefits include: lower power cost and extended service life of the blowers.  VFDs offer great flexibility, but they have high purchase costs and there are still many applications in which they can be inefficient. Continue reading “The Benefits of Adaptive Control Systems”