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Water & Wastewater Treatment

For more than 100 years, customers around the globe have trusted HOFFMAN & LAMSON blowers and exhausters for water and wastewater treatment applications. We know that every treatment facility has its own unique design and output capacities. As experts in aeration blower technology, we can match these requirements.

Our aeration blowers and exhausters are the proven standard for water and wastewater treatment applications. From our HOFFMAN & LAMSON multistage centrifugals to our regenerative and high-speed blowers/exhausters, we offer the latest technology best suited to maximize productivity and minimize energy costs for your operation.

Learn more about specific water and wastewater treatment applications and view compatible products below.


Wastewater treatment methods vary greatly for many reasons, such as the volume and composition of the sludge in the influent. Basically, the process in a wastewater treatment plant allows solids to settle out and the remaining organic matter is broken down by microorganisms. Each area of the plant has a specific function, and throughout the process aeration is required.

HOFFMAN & LAMSON blowers are used to provide oxygen to the microorganisms that consume organic matter, and provide airflow for the bubblers used in wastewater treatment.

Aerobic Digestion

HOFFMAN & LAMSON multistage centrifugal blowers often provide airflow for the bubblers. This air would generally be 1,500 to 30,000 CFM (2,550 to 51,000 m3/h) with pressure typically between 6 to 12 psig (0.4 to 0.8 bar g), with a maximum of 16 psig (1.1 bar g).

Digester Gas Boosting - Anaerobic Digestion

Anaerobic digestion further digests the concentrated sludge after the aerobic process. In this process, sludge is converted to methane and carbon dioxide. An airtight reactor is used and the process can take 30 to 60 days. Our multistage centrifugal blowers are used to mix the contents of the digestor or move the gas from one place to another. They can also be used to boost the gas to a compressor for storage, directly to flare or to a boiler.

Filter Backwash

There are two types of backwashing, semi-continuous and continuous. Air from blowers is used in a semi-continuous pulsed-bed filter. When the suspended solids in the effluent cease to filter to an acceptable level or the head pressure begins to increase, backwashing begins. Our multistage centrifugal blowers provide the air for backwashing in this process. The typical arrangement is one blower per filter.

Grit Chamber Aeration

Wastewater usually contains a relatively large amount of inorganic solids called grit (e.g. sand, cinders and gravel). This material will damage pumps by abrasion and cause serious operation difficulties in sedimentation tanks and sludge digesters. Thus, it is common practice to remove this material in grit chambers.

An aerated grit removal system removes particles by forcing water that has passed through bar screens into a grit chamber, which has air pumped into it. The air causes a spiral of water to flow through the tank and heavier particles are thrown out of the water's streamline. Eventually, after hitting the wall, the heavier particles settle to the bottom of the tank, while the lighter organic particles are suspended and eventually passed through the tank.

Membrane Bioreactors

When used with municipal wastewater, membrane bioreactor processes can produce effluent of high enough quality to be discharged to waterways or used for irrigation. Two configurations exist: internal/submerged and external/sidestream. Hoffman & Lamson offers advantages for upgrading your existing system with a small footprint and easy retrofit.

Sequencing Batch Reactors

Sequencing Batch Reactors are a special form of activated sludge treatment in which all of the treatment process takes place in the reactor tank and clarifiers are not required. This process treats the wastewater in batch mode and each batch is sequenced through a series of treatment stages.

Sequencing Batch Reactors (SBR), or sequential batch reactors, treat wastewater such as sewage in batches. HOFFMAN & LAMSON blowers are use to provide aeration, where oxygen is bubbled through the wastewater to reduce both biochemical and chemical oxygen demand. This process makes the effluent suitable for discharge to surface waters or for use on land.

Sludge Incineration

Two main types of sewage sludge incineration (SSI) plants re used: multiple hearth and fluidized bed. Over 80 percent of the operating sludge incinerators in the USA are of the multiple hearth design and about 15 percent are fluidized bed combustors. HOFFMAN & LAMSON blowers are used in both, as either air cooling or fluidizing air blowers.