What you'll find here...
When considering what wastewater treatment plant process will best serve your needs, there are several options Pollution Control Systems (PCS) can offer. We will analyze your wastewater properties, load capacity and design requirements to provide a solution that is both efficient and effective.
CLARIFICATION (CIRCULAR MECHANICAL)
Circular Center Feed (Shown with Steel Tank)
Flow enters through the center stilling well and is forced downward, ensuring a proper settling time before it rises and exits through the wall-mounted weir troughs. The skimmer covers the surface of the clarifier between the center stilling well and the scum baffle.
Circular Peripheral Flow (Shown with Concrete Tank)
Flow enters at the periphery, where it is evenly distributed and spiraled downward around the annulus by means of the specifally designed baffle skirt, providing for maximum settling toward the sludge pickup. Flow exits through the center-supported weir troughs.
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CLARIFICATION (PARALLEL PLATE)
The collection surface of the inclined parallel plate packs allows the solids to easily slide downward to the hopper bottom solids collection chamber below. The collected solids will require removal by maintenance personnel. The clarified effluent will overflow an adjustable weir into an effluent chamber. The clarified effluent will then exit via gravity to discharge.
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CHLORINATION/DISINFECTION
Disinfection is the process of destroying pathogenic micro-organisms by physical means. There are a number of chemicals and processes that will disinfect wastewater. Disinfection is usually the final stage in the wastewater treatment process in order to limit the effects of organic material, suspended solids, and other contaminants.
The primary methods of disinfection in the wastewater treatment process are Ultraviolet Irradiation or Disinfection (UV) and chlorination. Although both methods are acceptable and effective, chlorination is typically the most economical method of disinfection.
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EXTENDED AERATION
Extended Aeration is a variation of the activated sludge process with no primary settling. The Extended Aeration process has a 24 hour aerobic retention time which results in the generation of less excess sludge.
Extended Aeration is a biological treatment process, which is able to produce a high quality of effluent. This process is widely used and recommended for installations remote of city sewers. Users span from small and medium sized cities, land development/housing subdivisions, mobile home parks, remote mining, logging, and construction sites, recreational areas, parks and marinas, military bases and educational facilities, and low flow/high strength as well as high flow/low strength applications.
Extended Aeration is the most popular biological treatment process in package style wastewater treatment which produces a high quality effluent with ease of installation, operation, low maintenance, and operational costs.
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ACTIVATED SLUDGE
Wastewater is collected into an aeration tank, where oxygen is introduced to the sewage. This mix (sometimes called a mixed liquor) utilizes the bacteria and protozoa that feed on organic matter in the wastewater. After the period of agitation has ended, the sludge will settle to the bottom where it is introduced to sewage in the wastewater into a primary clarifier while the wastewater moves on for further treatment.
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NITRIFICATION/DENITRIFICATION
Nitrification of wastewater relies on the bio-chemical reaction of the nitrogen in ammonia to nitrite, and eventually nitrate. The organic ammonia present in wastewater can come from multiple sources such as animal protiens, urea, and amino acids. Bacteria then breaks down the ammonia into nitrite.
Denitrification is required to remove the toxic nitrate from the wastewater before it can be purified even further. Removing the nitrate requires a conversion to nitrogen gas. This process can only be performed under anaerobic conditions; bacteria present in a near zero oxygen environment.
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OIL/WATER SEPARATION
The operation of the coalescence type separator is based on the use of surface areas that reduce the distance an oil droplet must travel before it reaches a collection surface. The coalescence plates are constructed of materials that are hydrophobic (water repelling) and oleophilic (oil attracting). When the oil droplet comes in contact with the plate, it reaches a zone of zero velocity and adheres to the surface. The coalescence surfaces multiply the effectiveness of the natural action of oil and water to separate.
As the media plates become coated with continuously agglomerating oil, the oil begins to form droplets, which coalesce or migrate upward. This creates a condition that accelerates the vertical movement of the oil. The oil coating the media surface accumulates at the top edge of the media where it detaches as a droplet and floats to the surface of the separation chamber. Once it breaks away from the media, the oil then resides on the surface of the water. There are now two zones of liquid in the separator – oil and water. The oil is then collected for removal as the clear water is discharged through an outlet. Finally, sludge is collected in the media pack and settles in a separate compartment.
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TERTIARY TREATMENT
The standard tertiary filter system provides filter cell flow division, filtration, air scouring, backwashing, and backwash return of the wastewater.
The filtrate percolates through each of the multi-media filter cells and then into the area below the filter nozzle plates. From there, the filtered wastewater flows through the backwash piping, the backwash pumps, and into the clearwell tank. The filtered water in the clearwell will then overflow an effluent weir trough to disinfection and exits the tertiary filter system to complete the treatment process.
When the surface of the filter cells become clogged or covered with solids, the wastewater level begins to rise.
The rising wastewater level activates the air scouring and backwash cycles. The backwash cycle will use filtrate from the clearwell to backwash and dislodge the solids entrapped in the media. The media will be automatically air scoured and backwashed as air and clean filtrate water is pumped through the filter media from the bottom up, dislodging the retained solids. The rising backwash water overflows into the surge (backwash return) chamber. The surge chamber collects the backwash water and, over a several hour period, will return it back to the head of the wastewater treatment system.
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