For more than 100 years customers around the globe have trusted Hoffman & Lamson blowers and exhausters for water and wastewater treatment applications. From our multistage centrifugal, to regenerative and high speed we have a blower solution for your treatment needs, all backed by our factory team of service and support professionals.
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.
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. Hoffman & Lamson 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.
There are two types of backwashing, semicontinuous and continuous. Air from blowers is used in a semicontinuous 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. Hoffman & Lamson multistage centrifugal blowers provide the air for backwashing in this process. The typical arrangement is one blower per filter.
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.
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 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.
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.