Energy Efficiency Study, Flagstaff, AZ

Flagstaff, AZ

FlagstaffAZ_wastewater treatment facility signTata & Howard conducted an energy efficiency study on the aeration blowers and pumps at the Rio and Wildcat Hill treatment plants.  The testing showed that modifications to these systems have the potential to save the City approximately $250,000 in annual electrical costs and $445,000 in APS rebate funds for the modifications. Pumping systems had efficiencies as low as 20%. Pumps and blowers were oversized to meet peak and future demands but not efficient at low flows or off peak flows.  Energy usage per million gallons treated of 2,170 KWH/MG with cogeneration and 2,804 KWH/MG at the Rio plant, with national average usage of 1,750 KWH/MG.

The project included the testing of blowers and pumps at two reclaimed water plants; review of all the wells, pressure reducing valves, boosters, and splits for energy savings; further evaluation of the turbo blowers and barscreens; and an evaluation of the replacement of the biogas piping for use in cogeneration.


Presentation:

Abstract: In Arizona, the Arizona Public Service (APS) estimates that water systems use 1/7th of all the power used in the State. From the APS testing program, it is estimated that 60 to 70 percent of all pumps have tested below industry standards or changes in operations are needed to operate more efficient. This presentation discusses the findings associated with energy studies completed for a small water supply system (Kachina Village Improvement District) and for a large system (City of Flagstaff, Arizona). The studies show that any water and/or wastewater system, regardless of size can benefit from an energy audit. The studies resulted in significant annual savings, potential rebates from APS to offset replacement costs, high return on investments, while promoting green initiatives.

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Onsite Wastewater Treatment Facility, Hopkinton, MA

Private Sector — Legacy Farms, Hopkinton, MA

Current Project

Legacy_collage_leachfield_MSB_915v3Tata & Howard is providing design and construction administration services associated with expansion of the Legacy Farms private wastewater treatment facility and effluent disposal areas from 115,000 gallons per day (gpd) to 190,000 gpd, which consists of the installation of additional membrane cassettes to increase the capacity from 115,000 gpd to 150,000 gpd, installation of additional membrane modules, installation of mechanical equipment fully redundant at a maximum daily flow of 190,000 gpd, permitting assistance with MassDEP, and the construction of two additional effluent disposal areas. Construction of the first of two new effluent disposal areas is underway, and T&H Project Engineer and Certified Soil Evaluator Matt Barry was recently on-site to conduct a perc test for the second effluent disposal area.

Original Project

HopkintonMA_LegacyFarms_layoutTata & Howard provided soil investigation and evaluation, preliminary design, and design services for an onsite wastewater treatment facility and disposal system to serve the proposed Legacy Farms mixed-use development in Hopkinton, Massachusetts.

The Legacy Farms development includes a retail village, a commercial district, a variety of residential spaces (apartments, town homes, single-family homes, and multi-family structures) on approximately 733 acres currently used for nursery and agricultural uses. Approximately 940 new dwellings, 450,000 square feet of retail and commercial space, and 500 acres of restored open space will be made available by the project.

Tata & Howard’s services have included development of treatment flows for the full, built-out project, as well as selection and design of the wastewater pumping treatment and disposal systems that were compatible for the site configuration and soils, and that would provide the level of treatment required by the Massachusetts Department of Environmental Protection (MassDEP).  The challenge was satisfied by the design for a phased approach to the construction of a membrane bioreactor (MBR) treatment system, which provides a high level of treatment.

The project includes three submersible pump stations that serve the wastewater treatment facility (influent, recirculation, and effluent disposal) and two submersible pump stations within the development itself.

Disposal of treated effluent at the Legacy Farms site will be managed by a combination of conventional leaching systems and an innovative use of drip irrigation, the first large-scale application of drip irrigation for disposal of treated effluent in the State of Massachusetts.

The success of this project was related to excellent communication between Tata & Howard and the client, and a strong working relationship with MassDEP.

Pump Station Design and Wastewater Treatment Facility Upgrades, Barre, MA

Department of Public WorksTown of Barre, MA

Barre wastewater treatment facilityThe Town of Barre retained Tata & Howard to evaluate their existing wastewater treatment facility. Tata & Howard recommended a three phase upgrade program in order to reduce the initial impact of the construction cost on the sewer use rates. Included in the upgrade program was the design and construction of a submersible pump station that lifts the raw wastewater from an equalization tank to the biological treatment process. The pump station has a capacity of 1.2 mgd and includes variable frequency drives. The pumping station is controlled by a new SCADA system at the wastewater treatment facility. Tata & Howard also designed 8,000 linear feet of collection system sewers in the Worcester Road area of town. The project also included 500 linear feet of force main and a wet well mounted pump station. The pump station has a capacity of 200 gpm.

Wastewater Pump Stations and Treatment Plant, Canaan, VT

Canaan, VT

Canaan VT aerialTata & Howard provided engineering services for the evaluation, permitting, design, and construction of five wastewater pump stations. The pump stations included a new triplex pump station with valve structure. The wastewater treatment plant upgrade was in addition to the pump stations. The other four pump stations consisted of a new, completely relocated pump station and the upgrading of three other dry pit wet pit stations to include generators and controls for telemetry. The pump station design included a plan for maintaining operations of the stations throughout construction, which was completed in the fall of 2014.

Wastewater Treatment Facility Design, Upgrades, Bid, and Construction Administration, Dexter, ME

Dexter Utility District, Dexter, ME

DexterME_wastewater treatment facilityTata & Howard team members provided engineering services to The Dexter Utility District to evaluate their existing wastewater treatment facility and to provide wastewater treatment facility design. It was recommended that a phased approach to upgrade the facility be utilized in order to reduce the initial impact on the sewer user rates. The first phase of the improvements combined improvements which would improve the reliability and obtain energy savings with cleaning and disposing of sludge for the first time from their 25 year old facility. This approach allowed for a grant loan financing package to be utilized. The first phase facility upgrade included replacing a leaking single air header main with two individual air headers, replacing course bubble diffusers with fine bubble membrane diffusers, replacing three 25 year old blowers with new blowers with variable speed drives. The speed of the new blowers is controlled by a PID loop using dissolved oxygen analyzers, to maintain optimum treatment and minimize energy consumption. These improvements have reduced the energy consumption at the wastewater treatment facility by more than 50 percent.

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Wastewater Treatment Facility, Hopedale, MA

Board of Sewer Commissioners, Town of Hopedale, MA

HopedaleMA_wastewater treatment facility disk filterTata & Howard has been working with the Town of Hopedale, Massachusetts for a number of years on a variety of wastewater collection and treatment projects.  When the Town received an administrative order to address copper and ammonia violations at the plant, they turned to Tata & Howard for assistance. We completed the design and construction of a Wastewater Treatment Facility Upgrade project which included the installation of an automated soda ash feed system and an integrated fixed film activated sludge system (IFAS). The IFAS system is an innovative biological treatment process using thousands of special carriers designed to increase total surface area for biofilm growth without expanding the plant’s footprint.  The blowers were also modified to provide better control over the aeration process.

A pilot study was conducted to test the ability of various reagents to facilitate the removal of copper from the waste stream.  An automated chemical addition system was designed to improve coagulation.  Additionally, a dynamic tangential filter was incorporated into the upgrade project.  These improvements have allowed the Town to now meet its discharge limits for ammonia and copper.

Water Supply Division Sanitary Survey, Greensboro, VT

Greensboro Fire District #1, Greensboro, VT

New England lakeTata & Howard first assisted the District with responses to the Water Supply Division Sanitary Survey and then developed alternatives for the long term plan that would address all of the deficiencies and meet compliance with the Federal and State drinking water rules. The issues were as follows:

  • Wooden roof over concrete storage tank
  • Inadequate disinfection system and metering of source
  • Inadequate system pressures at the highest points within the system
  • Water losses
  • Inadequate metering of sources of supply to the storage tank
  • Inadequate distribution piping for fire flows.

The solutions developed were as follows:

  • Design and installation of concrete precast cover on storage tank
  • Design of new building at storage tank with flow measurement and disinfection and better storage tank access for cleaning
  • Virtual abandonment of auxiliary springs and surface water emergency source
  • Design  of  water  main  replacement  to  meet  required  system  pressures  for compliance with the drinking water standards and rules
  • Locating, permitting and developing a new source of supply (well) to supplement the  existing  wells  and  virtually  eliminate  the  old  spring  sources  due  to  the potential for contamination that had occurred in the past.
  • Securing the maximum amount of grant funding available to the District at 45% with the remainder a low interest loan.

Water Supply Upgrades, Canaan, VT

Canaan Fire Districts (FD) #1 and #2, Canaan, VT

canaan vt riverTata & Howard provided engineering services associated with water supply upgrades for Canaan FD #1 & #2. These two districts are located about 1.5 miles apart, meet monthly, and have one operator. For FD#2, located in Beecher Falls, VT, Tata & Howard completed construction of a new  concrete storage tank, well upgrades, and  distribution system improvements including significant replacement of pipe. Tata & Howard was able to secure a 75% grant for the project which resulted in little impact to their water rates.

Fire District #2

FD#2 has 100 customers. The issues included inadequate system pressures, inadequate storage tank, inadequate disinfection system, and leaky pipes.

Tata & Howard developed solutions that included the following:

  • A new storage tank at an elevation that would eliminate all pressure issues
  • Distribution piping replacement and addition of hydrants of flushing and fire protection
  • Reduction in water losses allowing for reduced well pump size, resulting in lower annual power and chemical costs

Fire District #1 

FD#1 has two sources of supply. One is a large spring system located in Canada which consists of  ten springs connected together, all under the influence of surface water and the other is a high yielding well source in the town limits. The issues are inadequate spring source construction and ability to maintain, low system pressures across the State line (they provide water service to West Stewartstown, NH), inadequate flushing capabilities, inadequate distribution piping, high iron and manganese levels in well source, and inadequate storage tank.

The solutions include the following:

  • Elimination of the spring sources due to Canadian border issues and high cost for upgrading the springs and connection piping
  • Installation of filtration system to meet the standards for FE and MN
  • Construction of new larger water storage tank
  • Development of a second emergency supply
  • Improvements to distribution piping

In addition, we completed a feasibility study.

Wastewater Treatment Plant Upgrades, Lyndon, VT

Lyndon_VTTata & Howard provided evaluation, planning, funding assistance, design, and construction phase engineering services for an upgrade to the 30-year old 0.750 MGD Extended Aeration Activated Sludge Treatment facility including conversion to Anoxic/Oxic activated sludge process to allow more operations’ flexibility, reduce construction and annual O&M costs, and prepare for potential for nutrient removal.  Improvements consisted of the construction of four anoxic basins and four oxic basins, replacement of clarifiers, addition of five blowers, new electrical and control building, new heating system, new influent pumps, headworks influent screen followed by grit removal, centrifuge for sludge dewatering and post sludge dry storage building for the Class A Sludge. The project was funded by a USDA Rural Development loan and grant.