The clarification process is important in water or wastewater treatment, as it involves the removal of suspended solids, resulting in a clarified process stream.

In water treatment, the process of clarification is often accelerated through the applications of coagulants and flocculants, in order to enhance gravity settling.


The process of removing suspended solids, in order to produce a clarified process stream is important to ensure water treatment and wastewater discharge requirements are met. There are a variety of different clarification systems available in a range of different configurations and sizes that can be tailored to meet individual project needs.


Before raw water or wastewater enters a clarifier, coagulants and flocculants are usually applied, in order to instigate the finely suspended particles to clump together and form larger and denser particles, called flocs, that settle relatively quickly, compared to untreated feedwater. The upstream chemical pre-treatment process is desirable as it allows the separation of the solids in the clarifier to occur more efficiently. The clarifier works by permitting the heavier and larger particles to settle to the bottom of the clarifier. The particles then form a layer of sludge at the base of the clarifier requiring regular removal and disposal. The clarification process is commonly used at the early stages of water treatment as it reduces the solids loading and minimises downstream water treatment processes like filtration.


Tubes or Lamella plates are commonly used in rectangular clarifiers to increase the settling capacity by reducing the vertical distance a suspended particle must travel. High efficiency settlers use a stack of parallel tubes, rectangles or flat pieces separated by several centimetres and sloping upwards in the direction of flow.


These structures work providing a very large surface area onto which particles fall and become stabilized, aggregating very fine particles that can settle as the flow exits the plates. Structures inclined between 45° and 60° allow gravity drainage of accumulated solids. Tube settlers may allow the use of a smaller clarifier and may enable finer particles to be separated with residence times of usually less than 10 minutes.


At Parkway, our team of water treatment technicians and engineers are able to assist in developing a reliable and effective clarification solution, to meet project specific requirements, including the toughest clarification challenges.


Our water clarification related PRODUCTS include

  • Analytical Instruments, to test the presence of suspended solids
  • Flocculators, to test the effectiveness of various coagulants and flocculants in a typical jar test
  • Water Treatment Chemicals, including coagulants and flocculants
  • Chemical Dosing Pumps
  • Chemical Tanks
  • Instrumentation & Controls, to support dosing of coagulants and flocculants
  • Pump Range, including specialty pumps to assist in clarification.
  • Pipe, Hose & Fittings
  • Other Clarification Products
    • A range of other clarification options.


Our water clarification related SERVICES include

  • Analytical Testing Services
    • We are able to determine the presence of problematic suspended solids and provide solutions.
  • Project Evaluation Services
    • We are able to perform a feedstock characterisation study to determine potential coagulation and flocculation options.
  • Process Development Services
    • We are able to model, evaluate, optimise and validate integrated process treatment including chemical dosing and dewatering options, to ensure key project requirements are satisfied.
  • Project Engineering Services
    • We are able to provide engineering support from the early process engineering phase, all the way through to more advanced stages of designing an appropriate clarification system.
  • Installation & Project Management Services
    • We are able to perform all site related works, including the installation and commissioning of clarification related treatment systems.
  • Operations & Maintenance Services
    • We are able to assist with operations and maintenance of clarification related treatment systems, to ensure the installed system continues to operate in line with design specifications.


Our water clarification related SOLUTIONS include

  • Integrated Clarification Solutions
    • By leveraging our industry leading range of clarification related products and services, our team of water treatment specialists is able to supply a standard integrated system, in order to minimise costs and maintain short delivery timeframes.
    • For larger projects, or applications where a more specialised requirement may exist, we are able to design packaged systems, to provide a reliable and effective clarification solution to meet project specific requirements.
    • Packaged solutions provide the advantages of a custom engineered system, incorporating a range of pre-treatment, instrumentation, controls and other process integrations, whilst minimising the requirement for onsite installation, resulting in improving onsite safety and reduced installation costs.

Additional information regarding our range of Clarification Systems and related solutions, is outlined in the Parkway Clarification Systems brochure.


For additional information, or to discuss how we can assist you acquire the most suitable clarification related solution to address your disinfection related challenges, we invite you to reach out and speak to a Parkway water treatment specialist, today.


Contact Us


General Enquiries

1300 7275929 (PARKWAY)



Parkway Process Solutions – Melbourne

+61(0) 3 9069 3200


Parkway Process Solutions – Perth

+61(0) 8 9249 9003