Municipal

Total system concepts for municipal and governmental applications - water and wastewater treatment, methane gas recovery and central vacuum cleaning of schools, buses, administrative offices and other local public facilities.

Municipal water and wastewater aeration systems

For your water and wastewater aeration needs, look for systems rather than just blowers. And look for the most efficient package that will deliver air at the lowest net energy cost. You can save tens of thousands of dollars annually with Spencer systems that are process-optimized and technology-ready for the latest Biological Nutrient Removal (BNR) and Membrane Bioreactor (MBR) concepts.

Spencer’s aeration systems include energy-efficient multistage centrifugal blowers, variable frequency drives, dissolved oxygen controls, and in-house designed and built electrical control systems. Spencer has years of experience and hundreds of systems installed worldwide. We will design your entire system and accept responsibility for the integrated operation of all system components that we provide.

Typical WWTF blower applications

Location/Activity Spencer product

Grit collection tank Multistage centrifugal and

aeration regenerative blowers

Headworks building Multistage centrifugal and

aeration regenerative blowers

Aeration building Multistage centrifugal blowers

Channel aeration Multistage centrifugal and

regenerative blowers

Sludge/Digestion Digester gas boosters

Storage Tanks

Compost building Single stage and multistage

centrifugal blowers

Sludge dewatering Multistage centrifugal and building regenerative blowers

Spencer’s total aeration system package

Power Mizer® high efficiency centrifugal blowers

Multistage blowers with three-dimensional impellers

Superior aerodynamic design

Special coatings available for corrosion resistance

Variable frequency drives

Air delivery based on biological demand and

system resistance

Avoids inflexibility and waste of constant speed

blowers

Helps end basin imbalance, foaming and undesirable

organisms

Dissolved oxygen control systems

Probes, analyzers, flowmeters, motorized basin valves

(MBVs)

Provides input for sophisticated, fine-tuned air delivery

Blower & motor protection panels

Bearing temperature and blower vibration monitors

Oil level monitoring systems

Motor phase protection and stator winding RTDs

Motor overload and surge protection

Motor control centers

Comprehensive, customized motor control capabilities

Efficient modular design integrates VFDs and MCC

circuitry

Factory assembly and testing avoids field

troubleshooting

Aeration system engineering

Coordinated services of process, electrical and

mechanical engineers

On-staff Spencer experts in wastewater treatment and

aeration

Programming specialists for airflow control logic

Electrical controls design expertise

UL/CUL Listed control panels with PLCs and

operator interfaces

SCADA system tie-ins

Flow and pressure transmission systems

Mechanical system components

Inlet filters, inlet and discharge silencers

Isolation valves, check valves, throttling valves

Expansion joints

Temperature and pressure monitoring systems

Methane - noxious pollutant or potent energy source?

Anaerobic digesters at wastewater treatment plants create a gaseous byproduct that is typically 65–70% methane and 25–30% carbon dioxide, plus particulates, moisture, oils and a little hydrogen and nitrogen. This mixture is a serious pollutant, but it’s also a powerful, inexpensive fuel for boilers, gas turbines, micro-turbines, sludge heaters, fuel cells and auxiliary power.

But first, you have to establish a stable supply at a boosted pressure. Our digester gas boosters are so effective at this, we have seen engineering specifications that read: “Sludge gas booster blowers shall be The Spencer Turbine Company, Model GH, or equal. Engineer knows of no equal.”

To deal with the highly corrosive and flammable gas, the gas booster is made of stainless steel with anodized aluminum fans and Inconel electrical connectors. An explosion-proof motor is located inside the gas booster housing, where it is cooled by the digester gas flow. Spencer’s completely hermetic design has zero leakage to the environment.

Spencer supplies its digester gas boosters as a complete turnkey module, skid-mounted and ready for utility hookups. Each package has its own control panel, hermetically sealed gas booster, isolation valves and other customized components such as a gas aftercooler/intercooler and stainless steel piping.

If your system has varying combustion fuel requirements, Spencer engineers can add a recirculation system with bypass piping. The bypass loop keeps gas flowing through the gas booster at all times for motor cooling, even when output flows are reduced.

Spencer digester gas booster advantages

Multistage, continuous-duty gas booster
Explosion-proof motor and controls
Hermetically sealed for zero leakage
Self-contained, prewired and prepiped
Very high corrosion resistance
Customized for new or retrofit installations

Natural gas dilution system when flow is low

Being a biological process, digester gas production can be variable and unpredictable. This creates a problem if the output demand remains constant. A Spencer natural gas dilution system keeps your system online by diluting natural gas with air, creating a temporary replacement fuel with matched BTUs to digester gas.

Like Spencer’s digester gas booster, the natural gas dilution system is furnished as a skid-mounted package. All system components are mounted and interconnected on a common skid that is designed to fit the exact dimensions of a new or retrofit installation.

Landfill gas extraction - another Spencer innovation

In municipal landfills, decaying organic matter produces a methane-rich gas similar to digester gas. Spencer has devised an effective technique for extracting and delivering this gas to accomplish two environmentally significant goals: reducing greenhouse gases and developing alternative, renewable energy sources. Our high-efficiency Power Mizer blowers are specially equipped with corrosion-resistant coated impellers and sealed to minimize leakage.

The rest of the story - more municipal Spencer contributions

Location	Spencer product/application
Water treatment plants	Power Mizer blowers provide air for filter cleaning in air scour/filter backwash systems
Public schools	Central vacuum cleaning systems for indoor air quality improvement, facility-wide sanitation, liquid spills pickup, vacuum-assisted shop tools
Public transportation	Central vacuum systems with extra-long hoses to clean bus fleets and rail cars
Police and fire facilities	Central vacuum systems for quiet, thorough cleaning of Call Centers, protecting sensitive communications equipment from dust contamination
Theaters, public halls	Central vacuum systems can be ideally configured for cleaning long rows of seats and carpeted or bare floors

Power Mizer® aeration blower for municipal wastewater treatment has a companion Spencer control system with PLCs, dissolved oxygen control logic, operator interface keyboards, modem software for factory communication and motor control centers.

Spencer central cleaning systems for schools turn classrooms into cleanrooms with their high-powered cleaning ability and specialized tools for carpeted floors and other surfaces.

Spencer natural gas dilution systems give municipalities the ability to utilize digester gas as their primary fuel, with natural gas as a supplementary backup when needed.

Digester gas boosters help municipalities develop a new fuel source from their sanitary landfills and wastewater treatment plants.

Complex Spencer control instrumentation was part of a $1 million municipal wastewater aeration system upgrade. All panels and circuitry were designed and built by Spencer.