Water/Wastewater Treatment Systems


Industrial wastewater treatment

As one of the most qualified and experienced water/wastewater treatment contractors in the industry, Ahern can ensure your next project is completed correctly and on time. Our staff includes certified wastewater treatment plant operators, licensed designers, and experienced field personnel. We can meet your project needs, regardless of size.We are equally comfortable working in municipal and industrial environments, and also perform environmental remediation projects.

Ahern designs, installs, and services the following partial list of systems. If you don't see the system you're looking for, please contact us for further information.

Activated sludge wastewater plants use aeration basins to feed air/oxygen to micro-organisms that further the treatment process. Aeration systems include fine bubble ceramic and membrane discs, permeable ceramic plates, membrane tubes, and coarse bubble stainless steel diffusers and tubes.

Wastewater treatment facilities often use methane gas (biogas) from digesters to generate electrical power for supplemental use. This biogas is typically cleaned, dried, and compressed for use as fuel for boilers, engine generators, and micro-turbines.

Blowers in water and wastewater treatment facilities are used for various processes throughout the plant. Blowers come in several types, including rotary lobe, centrifugal, and high-speed turbo.

Water and wastewater facilities use various chemicals in their treatment processes. Liquid metering, gas feed, and dry feed systems are typically used. Chemicals used include chlorine, fluoride, polymer, CO2, alum, hydrogen peroxide, ferric chloride, and lime.

Primary, secondary, intermediate, and final clarifiers allow process flow to slow and settle heavy solids (sludge) to the bottom and float surface scum to the top for collection and removal. Clarifier types include circular (uni-tube and scraper) and rectangular (chain and flight).

Wastewater treatment facilities typically use digesters as a way to treat sludge generated from clarification. Anaerobic digester systems include mixing (pump & nozzle, draft tube, linear motion, gas bubble); floating and fixed covers; gas safety & compressor equipment; and boiler & heat exchanges packages. Aerobic digester systems use coarse bubble aeration systems for treatment.

Gates of several types are used in water and wastewater facilities to direct plant flow and provide isolation as needed. The types of gates include sluice, stop, weir, log-type, and slide. Gates come in several material types, including cast iron, stainless steel, aluminum, fiberglass, and Coplastix.

Grit removal systems provide a way to remove sand, gravel, and other heavy materials from the process prior to primary treatment. Systems types include vortex centrifugal, aerated, as well as chain and scraper collection.

Wastewater treatment facilities sometimes use incineration as a disposal method for their sludge. Ahern has the experience to work on sludge incinerators of all types.

Mechanical screens provide initial treatment of water and wastewater prior to primary treatment. Screens come in many different types, including step/stair, coarse bar, fine screens, and traveling water screens. Ahern has installed mechanical screens at the four largest wastewater treatment plants in Wisconsin.

Ozone is used in water treatment facilities as a disinfection process. Ahern has installed ozone equipment in several Wisconsin facilities.

Water and wastewater facilities have many different process piping systems, ranging from plant forward flow to chemical and sludge systems. Ahern installs all process piping systems in these facilities.

Ahern furnishes, installs, and repairs all pump types found in water and wastewater facilities. Some of the pump types include centrifugal, screw centrifugal, progressive cavity, diaphragm metering, vertical turbine, rotary lobe, air diaphragm, piston, double disc, Archimedes screw, submersible, and dry-pit submersible.

Wastewater treatment facilities that do not use an activated sludge process will often use rotating biological contactors (RBCs) as an intermediate treatment process – after primary clarification and before final clarification.

Water and wastewater treatment facilities use sludge presses in their sludge treatment process. Presses come in two main types – plate and belt.

Water and wastewater treatment facilities use sludge thickeners in their sludge treatment process. Thickeners come in two main types – tank and belt.

Ultraviolet disinfection systems are used in water and wastewater treatment facilities for final treatment of water prior to discharge. In-channel and pipeline mounted units are most common.

Ahern was instrumental in bringing this project in on time and to budget for our company... We could not be more pleased with the way Ahern managed this project for our company.

Steve Peterson


Mid-States Aluminum