Water & Wastewater Treatment Blowers

Water & Wastewater Treatment Process Overview 

Wastewater treatment methods vary greatly for many reasons.  The volume and composition of the sludge in the influent, as well as how the sludge residue will be disposed of, all dictate design aspects of the plant. 

A large volume of wastewater will preclude a simple batch system that might be appropriate for a smaller scale treatment facility. Sludge with low potassium or phosphorus content or loaded with heavy metals would not be suitable for land application. 

Basically, the 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. 

Hoffman & Lamson is a global leader of engineered solutions and produces premier quality products efficiently and economically.

Water & Wastewater Treatment Process Overview

Water & Wastewater Treatment Plant Process

Water & Wastewater Treatment Plant Process
  • Raw wastewater is run through a bar screen. The deflected large solids may be hauled away or reground and reintroduced to the treatment process. 
  • After passing through the bar screen, the influent enters the grit chamber. This is a large basin that allows the water to slow down and the grit to settle out. Grit includes sand, coffee grounds, and eggshells. This material cannot be broken down and must be hauled away. 
  • The remaining water reaches a grinding pump, called a comminutor. Large pieces in the water are shredded, making it easier for the microorganisms to consume it. 
  • Then the water enters the aeration chamber where oxygen enriches the water and microorganisms are added. The organic matter begins to break down. The microorganisms multiply rapidly and consume the biochemical oxygen demand (B.O.D.) very quickly. B.O.D. is simply the food matter in the water. This organic matter will be consumed in a couple of hours. The air that bubbles up not only feeds oxygen into the process but keeps the microorganisms suspended so they do not settle out. 
  • After the aeration chamber, water enters the clarifier or sedimentation tank. After consuming the organic matter, the microorganisms have food, grit and particulates stuck to their outer enzyme coating. The added weight makes them sink, or “floc out” to the bottom of the clarifier. Some of this sludge is removed. Some of it returns to the aeration chamber to help seed the next batch. 
  • Occasionally, after the aeration process, the water enters another tank with a sand filter bottom. HOFFMAN & LAMSON blowers are used to backwash the sand to keep it filtering properly. 
  • The sludge that will return to the aeration tank is held for ten days in a holding basin, Each day, a new layer of sludge is added. The oldest layer each day moves to seed the activation chamber. During the ten-day period, the sludge is activated (stressed) so that it becomes extremely hungry and ready to multiply. About one-fifth of the sludge that is removed from the process can be used as a soil conditioner after dewatering or in liquid form. Another method of sludge removal is landfilling. 
  • When landfill space is not available, wastewater treatment plants turn to incineration. HOFFMAN & LAMSON blowers are used in fluidized bed incinerators and in other incinerators to aide in combustion. 
  • After the clarifier, the water is called “supernate”. Chlorine is added and the water sits in the disinfection chamber while the disease-causing microorganisms are killed. 
  • The water is now safe to be released into a natural body of water. 

HOFFMAN & LAMSON blowers and exhausters for wastewater treatment facilities are the premier solutions across a wide range of applications while delivering quality, reliability, value, and performance. Our blowers serve many wastewater applications including aeration, digester gas boosting, anaerobic digestion, water/wastewater filter backwash, sequencing batch reactor (SBR) and membrane bioreactor (MBR) aeration, wastewater treatment sludge incineration, and grit chamber aeration. 

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Equipment is tested prior to reaching the customer or end-user. This ensures top quality and avoids unforeseeable issues or operational downtime. Therefore, upholding Hoffman & Lamson’s strong reputation as the global leader of engineered solutions and producing premier quality products efficiently and economically. There are over 100,000 HOFFMAN & LAMSON multistage centrifugal blowers and exhausters in operation worldwide.