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Conventional Activated Sludge Wastewater Treatment Systems

The conventional activated sludge (CAS) wastewater treatment process is an aeration system that removes dangerous substances from effluent water to minimize their impact. It is an ideal cleaning solution to ensure the wastewater from industrial and municipal plants is safe enough to be released back into the environment.

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Process Design

Conventional activated sludge systems consist of an aeration tank, in which the wastewater is mixed with oxygen. This process activates microorganisms that digest the wastewater and collide with each other, forming flocs. These flocs have an increased ability to degrade the wastewater’s biological components.

The conventional activated sludge process usually involves these components:

1
Primary Screening
This is otherwise known as the grit removal phase. The wastewater is passed through screens of varying sizes to filter out leaves and other solid waste.
2
Equalization (EQ) Tank
After the primary screening, the wastewater travels to the primary sedimentation or EQ tank, in which microorganisms naturally decompose the organic waste. Oxygen is injected into the tank to feed and multiply the microorganisms and flocs.
3
Clarifying Tank
After going through the EQ tank, the wastewater is sent to the clarifying tank, also known as the “settling tank.” This is where the microorganisms sink to the bottom of the tank, letting the water grow cleaner and reach a state of clarification. The microorganisms are recycled back into the EQ tank to decompose more waste solids.
4
Tertiary Filter
While wastewater is often safe enough to be reintroduced into the environment after clarification, this component can be utilized to remove more total suspended solids and produce cleaner effluent. Water that has gone through tertiary filters can often be used for purposes requiring cleaner water.

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right for your Water Treatment Facility

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Benefits of Conventional Activated

Sludge Systems

CAS is the most popular form of wastewater treatment across industries for various reasons:

Reliability
The CAS system is reliable, ensuring plants can release wastewater safely into the environment.
Familiarity
Since CAS is one of the oldest wastewater treatment systems, it is familiar to those working in the wastewater industry. It will be easier to find a technician to fix any issues, should they arise.
Versatility
The CAS system offers flexibility for handling various types of loads.
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Diffusers

 

Diffusers are essential for aeration in CAS systems. SSI Aeration, Inc. offers reliable coarse bubble diffuser design through several products, including:

  • The AFC coarse bubble disc diffuser for EQ tanks, offering adaptable flow operation
  • The ReliaBall® SSI coarse bubble disc diffuser for preventing clogging
  • Wide Band diffusers, which can handle more demanding applications in wastewater treatment

 

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MOVING BED BIOFILM REACTOR (MBBR) WASTEWATER TREATMENT SYSTEMS

 

A moving bed bioreactor (MBBR) with a smart design can provide better cost-effectiveness than membrane bioreactor or activated sludge plants. MBBR process design services from SSI Aeration help wastewater treatment plants improve their efficiency. SSI’s MBBR systems save money in plant construction, operation,
and maintenance.

 

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Full Service

The aeration system designers at SSI Aeration, Inc. understand many factors are involved in building a reliable CAS system customized for clients’ environmental conditions and budgets. SSI designers handle all the heavy lifting, including pipe installation, retrieval systems, diffusers, mounts, supports and accessories.

The SSI Aeration, Inc. team will help clients design the ideal wastewater treatment system and assist through every step of the process, including:

Consultation
Calculations
Simulations
Hydraulic Studies
Drafting
Specifications
CFD Modeling
Biological Process Simulation
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Build American, Buy American

 

SSI Aeration’s dedication to what Buy America, Build America represents goes beyond product sourcing and manufacturing. With a complete engineering department in the U.S., SSI provides clients with a wide range of design services to ensure they maximize their wastewater treatment systems and equipment capabilities.

 

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Additional Services Offered by
SSI Aeration

PRE-ASSEMBLED DIFFUSERS – PODS™
PODs™ pre-assembled aeration diffusers save time and have a low margin of error. They suit situations that require a fast installation or collaboration with a contractor. Learn more about SSI’s exclusive PODs™ diffuser systems and their benefits.
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FIXED GRID and Retrievable Systems
Fixed grid systems are a type of configuration used in a diffused wastewater aeration process. The design features a grid of bolting pipes permanently fixed to the floor of a tank, covering the entire area. This diffused aeration system also includes air blowers and diffusers that are connected to the piping.
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Full Engineering Installation Services
SSI Aeration has a team of trained technicians who are available to travel to job sites around the world. Having one of our technicians on-site ensures correct installation and worry-free performance over the longest period possible.
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Choose SSI for All Your Conventional Activated Sludge Needs

With over 20 years of experience in helping organizations across industries treat their wastewater, SSI Aeration, Inc. will ensure your treatment system helps your business stay regulation-compliant and keeps the environment safe. Call today to request a quote, or submit the contact form.

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