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GreenStep City Best Practices Environmental Management

Efficient Water and Wastewater Systems
no. 20

Assess and improve city drinking water and wastewater systems and related facilities.
  Best Practice Action 2      [ 1 2 3 4 5 6 7 ]       [all actions]

Plan and budget for motor maintenance and upgrades so as to assure the most energy efficient, durable and appropriate equipment is available when upgrades or break downs occur.

 
Create a motor replacement plan for key motors, to at least maintain efficient operation and preferably improve it; utilize utility conservation improvement program for motors.
Upgrade SCADA systems to use existing flow and amperage or kilowatt measurements as a real-time efficiency measure for key equipment.
Review energy use for proposed plant upgrades at current volumes of water treated as well as at design capacity to verify the plant will run efficiently over the range of expected flow rates.

Hutchinson

Date action report first entered:   04/30/2015
Date of last report update:   04/30/2015

Implementation details:
A variety of improvements have been implemented at the Water and Wastewater Plants to reduce cost and waste of resources. These improvements have been made largely out of necessity when pumps and motors fail. VFD's, in-line monitoring that is synced with controls, SCADA controls that track and trend a variety of variables are all used to optimize treatment efficiency as well as reduce power demand and waste.

Outcome measures/metrics:
The Hutchinson Wastewater Treatment Plant has implemented improvements that have reduced the electric demand by 28% as compared to the baseline year of data.

            view file

For more information contact:
John Paulson (City staff)   |   jpaulson@ci.hutchinson.mn.us   |   320-234-5682

View All Hutchinson Actions

Rogers

Date action report first entered:   10/18/2018
Date of last report update:   10/18/2018
Action completed after joining GreenStep?   No

Implementation details:
Implementation of DO measuring units and floating aeration units.

Outcome measures/metrics:
Since implementing DO measuring units, there has been monthly energy savings. By improving technology used during the waste water treatment plant Rogers has been able to save money and improve efficiency.

            view file

For more information contact:
John Seifert (City staff)   |   jseifert@rogersmn.gov   |   763-428-0906

View All Rogers Actions

Arlington

Date action report first entered:   12/14/2015
Date of last report update:   12/14/2015

Implementation details:
The water treatment plant has four (4) variable frequency drives (VFDs) for the operation of the water system. There is one on each of the two wells and one for each of the high service pumps. The waste water plant has a total of 16 variable frequency drives throughout the plant. The drives run the blowers, mixers and return activated sludge pumps throughout the facility, both plants are using Programmable Logic Controllers for the operation of the systems.

Outcome measures/metrics:
There have been multiple benefits in implementing the VFD’s on pumping applications; providing significant savings in both the short and long term (such as process control for monitoring flow rates and dissolved oxygen level s). Energy savings has significantly increased because the electrical motors are not running at full speed, or stopping and starting, thus resulting in less stress and reduced wear on the equipment. The electrical demand at the facilities has been greatly reduced, along with the maintenance that needs to be completed on the equipment, resulting in the extended life of the equipment. Staff performs monthly, bi annual and annual maintenance on the plants equipment in order to keep the devices running near peak efficiency which prolongs the replacement of the equipment.

For more information contact:
Lee Ortloff (Contractor)   |   LOrtloff@peopleservice.com   |   612-636-2434

Partners:
PeopleService

View All Arlington Actions

Burnsville

Date action report first entered:   06/22/2012

Implementation details:
Burnsville has Rehabilitation Plan for it's pumps, motors and variable frequency plans, that operates on a 10 year cycle. The city usually buys the most energy efficient parts for replacement. Most often, the city will receive generous rebates, so the most energy efficient parts are also the most cost efficient. The City upgraded it's SCADA system in 2010 and uses kilowatt measurements as a real time efficiency measure. Burnsville is in the process of planning a complete water plant upgrade, which will begin in 2016.

For more information contact:
Sue Bast (City staff)   |   basts@ci.burnsville.mn.us   |   952-895-4524

View All Burnsville Actions

Columbia Heights

Date action report first entered:   12/22/2014
Date of last report update:   12/22/2014

Implementation details:
The City recently conducted upgrades to Pump Station #2 per the Engineering study and CIP. Part of the requirements as set out in the contract (see attached excepts of project manual) was to improve energy efficiency of the pump station and better motors.

Outcome measures/metrics:
Project was recently finished and will use SCADA data to review energy efficiency outcomes.

            view file

For more information contact:
Jesse Davies (City staff)   |   Jesse.Davies@ci.columbia-heights.mn.us   |   763-706-3706

View All Columbia Heights Actions

Gilbert

Date action report first entered:   04/14/2015
Date of last report update:   04/30/2015

Implementation details:
Stantec

Outcome measures/metrics:
The outcome, as stated somewhat above is to prolong the treatment facilities life. The facility is extremely old, if left neglected serious injury could occur to workers or serious pollution could occur unto the surrounding environment. Hopes are to increase efficiency, increase flow rate, and most importantly reduce the amount of mercury entering the water system.

            view file

For more information contact:
Sam Lautigar (City staff)   |   samlautigar@gilbertmn.org   |   218-748-2214

Partners:
Stantec

View All Gilbert Actions

Inver Grove Heights

Date action report first entered:   05/24/2016
Date of last report update:   07/05/2017
Year action initially completed:   2004

Implementation details:
In 1998, the City of Inver Grove Heights built a water treatment plant, which was upgraded in 2004 to increase the water treatment capacity by 2 million gallons to meet the City's demands. In 2015, the City completed a total SCADA systems upgrade. The City of Inver Grove Heights plans and budgets for motor maintenance and upgrades to increase the motors' energy efficiency and durability. Annual motor maintenance checks are completed and used to identify where improvements will be made. The City of Inver Grove Heights has 7 wells that are on a 7 year maintenance plan. In this plan, one well is checked each year. This system maintenance schedule allows the City to reduce energy usage and save cost.

For more information contact:
Ally Hillstrom (City staff)   |   ahillstrom@invergroveheights.org   |   651-604-8511

View All Inver Grove Heights Actions

Richfield

Date action report first entered:   02/19/2016
Date of last report update:   02/01/2019
Action completed after joining GreenStep?   No

Implementation details:
The City of Richfield has 7 wells with motors that range from 125hp to 150hp. From 2005-2007, all 4 250hp high service motors were replaced with high efficiency motors, which are all on soft starts. From 2007-2010, the City replaced all 7 motors with high efficiency motors and installed a Variable Frequency Drive (VFD) at each location. In 2011, Xcel Energy used Richfield’s Motor Efficiency Program as a case study because we had a total energy savings of 375,570 kWh. It is common practice to replace motors with high-efficiency motors whenever replacements are needed. Our SCADA system was replaced in 2012; we use the trending mechanism to track flows and amperage which allows us to see fluctuations and address them before they become issues. In 2004, we completed a compressor study. From the study it was determined our 3 current (25hp) compressors were oversized and not efficient. We then worked with Xcel Energy on a customized replacement plan and we now have 3 15hp, high-efficiency compressors. In 2009, we completed an energy assessment in conjunction with Xcel Energy. From the assessment we implemented the following: 1) Installed motions sensors throughout the water plant. 2) Replaced light bulbs with 28w, down from the 32w. 3) Replacing fixtures with LED ones.

For more information contact:
Russ Lupkes (City staff)   |   rlupkes@richfieldmn.gov   |   6128619175

Partners:
Xcel Energy

View All Richfield Actions

Roseville

Date action report first entered:   01/13/2015
Date of last report update:   02/11/2015

Implementation details:
The city uses variable frequency drives on all pumps and replaces motors with the latest most highly efficient technology available. SCADA systems are used to measure flow and efficiency. The city's water booster station looks to operate at ideal levels.

For more information contact:
Ryan Johnson (City staff)   |   Ryan.johnson@cityofroseville.com   |   651-792-7049

View All Roseville Actions

Silver Bay

Date action report first entered:   03/31/2014
Date of last report update:   05/12/2014

Implementation details:
Old boilers in Silver Bay's water and wastewater treatment facilities have been replaced with more energy efficient boilers. They have switched from propane boilers to natural gas boilers. This change has caused huge improvements in the efficient operation of the facilities.

For more information contact:
Lana Fralich (City staff)   |   lanaf@silverbay.com   |   218-226-4408

View All Silver Bay Actions

Albert Lea

Date action report first entered:   07/21/2016
Date of last report update:   07/21/2016

Implementation details:
The City of Albert Lea has a maintenance and replacement budget for key equipment. Organization best practices require equipment to be replaced with the most efficient and effective alternative available.

For more information contact:
Jerry Gabrielatos (City staff)   |   jgabrielatos@ci.albertlea.mn.us   |   507-377-4316

View All Albert Lea Actions

Apple Valley

Date action report first entered:   03/21/2012

Implementation details:
The city conducts routine maintenance on all pumping facilities and motors. Well pumps/motors are on a 7-year maintenance inspection cycle; WTP pumps/motors are on an 8-year maintenance and inspection cycle; lift station pumps/motors are inspected annually.

For more information contact:
Charless Grawe (City staff)   |   CGrawe@ci.apple-valley.mn.us   |   952-953-2508

View All Apple Valley Actions

Austin

Date action report first entered:   10/25/2011

Implementation details:
The WWTP has an active program of planning and replacing motors and equipment with the most energy efficient, appropriate equipment available. Energy efficiency is considered for all pruchases of replacement equipment

For more information contact:
Janet Anderson (Elected official)   |   jkanderson@gofast.am   |   507-433-1081

Partners:
WWTP

View All Austin Actions

Barnum

Date action report first entered:   05/17/2016
Date of last report update:   05/17/2016

Implementation details:
In 2012, after facing a devastating flood, the City chose to update wastewater facilities by installing a new lift station utilizing variable frequency drive technology. This update created a more efficient system being cost effective and energy saving while moving the same amount of volume.

View All Barnum Actions

Bloomington

Date action report first entered:   01/29/2018
Date of last report update:   01/29/2018
Action completed after joining GreenStep?   No

Implementation details:
The Utility has a CIP in place that programs regular well and pump/motor rehab work. When energy efficiencies can be gained, older motors are replaced with new high-efficiency motors or variable frequency drives are retrofitted. CIP #SW-01-011 identifies well rehab projects but does not specifically detail energy components.

For more information contact:
Mary Hurliman (City staff)   |   mhurliman@BloomingtonMN.gov   |   952-563-8730

View All Bloomington Actions

Crystal

Date action report first entered:   01/03/2015
Date of last report update:   01/03/2015

Implementation details:
As equipment is upgraded, it is replaced with more energy efficient equipment.

For more information contact:
Anne Norris (City staff)   |   Anne.Norris@crystalmn.gov   |   763-531-1140

View All Crystal Actions

Eagan

Date action report first entered:   01/11/2011

Implementation details:
Utilities staff evaluate and upgrade motors on an annual basis as part of capital planning

For more information contact:
Jon Eaton (City staff)   |   jeaton@cityofeagan.com   |   651/675-5212

View All Eagan Actions

Elk River

Date action report first entered:   11/25/2010

Implementation details:
The wastewater treatment plant employees undertake an extensive maintenance and upgrade program to ensure that the facility is running smoothly and efficiently at all times. Some of the parts and machinery even have weekly maintenance requirements while others are checked bi-weekly or monthly.

For more information contact:
Amanda Bednar (City staff)   |   ABednar@ElkRiverMN.gov   |   763-635-1068

View All Elk River Actions

Fergus Falls

Date action report first entered:   01/14/2016
Date of last report update:   01/14/2016

Implementation details:
More efficient motors have been incorporated into the city’s maintenance plans.

For more information contact:
Len Taylor (City staff)   |   len.taylor@ci.fergus-falls.mn.us   |   218-332-5418

View All Fergus Falls Actions

Hastings

Date action report first entered:   04/27/2016
Date of last report update:   04/27/2016

Implementation details:
Energy efficient equipment is always a strong consideration whenever we make a purchase, construct a new facility, or conduct a rehabilitation project. We also must balance this with compatibility with existing systems, knowledge and experience of operations staff working with the equipment, and product reliability/quality.

For more information contact:
Nick Egger (City staff)   |   negger@hastingsmn.gov   |   651-480-2370

View All Hastings Actions

La Prairie

Date action report first entered:   01/04/2013

Implementation details:
sewer upgrades and expansion of city sewer to an area of the city that has failing septic systems and undrinkable water.

Outcome measures/metrics:
The city has initiated the replacement of all pumps, rails and electronics in all of its lift stations. The city budgeted 50% of the costs and applied for and received a matching grant to complete the other 50%. Two of the lift stations have already been upgraded and the other four will be completed in 2012. This improvement is the beginning step to the expansion of sewer and water to an area of the city which has failed septic systems and polluted wells. Our current sustem needed to be upgraded to handle the additional flow of the expansion. The city has increasd its sewer fees to accommadate future regular maintenance. A commitment from IRRR has been made to support the expansion of city water and sewer in the amount of $500,000. The city is pursuing other grant opportunities for another $600,000. The city has also lobbied the legislature to include this in the state bonding bill. This project is scheduled to be in construction in 2013. In 2012, we extended sewer and water to three businesses. One of those businesses emplys a hundred persons, one of the other businesses is a mobile home park. We have obtained funding to extend water lines to residences and businesses in another currently unserved area. This construction will occur in 2013. We have plan to extend sewer to this same area in 2014 in conjunction with a road restructure. As of December 2013, the city has completed a water system expansion to a previously unserved portion of the city that had failing wells and poor quality drinking water. This project has provided clean drinking water and fire hydrants to more than 15 residences and 8 businesses, government offices and a church. The sewer portion of the project is on track for completion in 2015.

Partners:
IIRB, Itasca County, GRPUC

View All La Prairie Actions

Mankato

Date action report first entered:   05/01/2014

Implementation details:
Mankato Wastewater Treatment Plant (WWTP)evaluates “premium efficiency” motors in either major upgrades or unscheduled maintenance and apply for rebates through Xcel Energy.

For more information contact:
Molly Westman (City staff)   |   mwestman@mankatomn.gov   |   507-387-8571

View All Mankato Actions

Mountain Iron

Date action report first entered:   12/14/2015
Date of last report update:   12/14/2015

Implementation details:
The City has been making significant steps in the efficiency of our Waste Water system. During a recent renovation of our plant, all blower motors replaced with more efficient models as well as variable frequency drives were installed on these motors. The drives reduce energy costs by regulating how the motors start and run times. Also the City has been installing soft starts on our key lift stations, the soft starts decrease the high demand that occurred during startup.

For more information contact:
Craig Wainio (City staff)   |   cwainio@ci.mountain-iron.mn.us   |   218-748-7570

View All Mountain Iron Actions

Red Wing

Date action report first entered:   01/30/2013

Implementation details:
This is a standard operating procedure for the City of Red Wing.

For more information contact:
Paul Drotos (City staff)   |   paul.drotos@ci.red-wing.mn.us   |   651-410-6744

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Saint Anthony

Date action report first entered:   05/05/2011

Implementation details:
The City of St. Anthony has installed VFD upgrades and digital controls to improve energy efficiency with water treatement and breakdown time.

For more information contact:
Jay Hartman (City staff)   |   jay.hartman@ci.saint-anthony.mn.us   |   612-782-3314

View All Saint Anthony Actions

Saint Cloud

Date action report first entered:   05/17/2017
Date of last report update:   05/17/2017
Year action initially completed:   2001
Action completed after joining GreenStep?   No

Implementation details:
Energy efficiency is a key criteria when selecting equipment replacement options.

For more information contact:
Tracy Hodel (City staff)   |   tracy.hodel@ci.stcloud.mn.us   |   3202557226

View All Saint Cloud Actions

Two Harbors

Date action report first entered:   04/07/2015
Date of last report update:   04/07/2015

Implementation details:
The city is currently undergoing a $3 million upgrade to its Sewage Treatment Plant for the reduction of mercury in its discharge. With this new upgrade, there is money put aside for equipment replacement when upgrades or break downs occur. The plant must be operating and in compliance with all regulations by January 1, 2016.

For more information contact:
Sven Bergerson (City staff)   |   berger55@frontiernet.net   |   218-834-8814

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Woodbury

Date action report first entered:   04/27/2013

Implementation details:
The City performs annual maintenance on all well house facilities and motors. Well motors/pumps are on a 10 year rehabilitation cycle. In rehabilitation, we are implementing Variable Frequency Drives (VFD) for energy efficiency and upgrading our safety controls. Lift station pumps and motors are inspected annually.

For more information contact:
Jennifer McLoughlin (City staff)   |   jmcloughlin@ci.woodbury.mn.us   |   651-714-3522

View All Woodbury Actions

New Hope pending

Date action report first entered:   04/02/2015
Date of last report update:   04/02/2015

Implementation details:
According to the city's Public Works Director, Public Works staff checks efficiency of collection systems and lift stations as well as vehicle motors on a regular basis.

For more information contact:
Jeff Alger (City staff)   |   jalger@ci.new-hope.mn.us   |   763-531-5119

View All New Hope Actions

pending means a star rating has not yet been assigned to this city


 
greenstep advisor
Brent Vizanko, Assoc. Engineer, Minnesota Technical Assistance Program: 612/624-4653, bvizan@umn.edu, http://mntap.umn.edu/us/staff.htm