Harrington Concrete & Quarries
HydroKlenze Biological Wastewater Treatment
Diagram showing the flow of wastewater through the HydroKlenze septic tank system

How It Works

Harrington HydroKlenze is composed of a primary 3-stage septic tank system, with a secondary economical electric air blower (Aeration Treatment Unit) that increases the efficiency in the treatment of household biological waste (influent).

Influent is wastewater flowing into the treatment plant.

Effluent is the treated water flowing out of the treatment plant into the percolation area.


The design and operation of the Harrington HydroKlenze system provides:-

  • Low running costs
  • Reduced desludging
  • No foul odours
  • Whisper quiet operation
  • Neat and unobtrusive installation

The Process

The Harrington HydroKlenze aeration treatment system provides both Primary (like a standard septic tank) and Secondary sewage treatment, for the removal of waste by using the process of sedimentation and micro-organisms (bacteria).


Stage 1

Wastewater (influent) enters the system, natural separation and settlement takes place in the Primary Settlement Chamber.

  • Heavy matter settles on the floor of the primary chamber, eventually forming bio-solids in the sludge layer.
  • Light particle matter rises to the surface to form the scum layer, and some matter stays floating within the bulk liquid as Suspended Solids

Stage 2

As more influent enters, settled clarified bulk liquid is discharged into the second stage of the process, the Biological Treatment (Bioreactor) Chamber. At this stage, the air blower unit pumps air via an airline to the base of the bioreactor chamber.

  • Small air bubbles vigorously circulate the bulk liquid throughout the HydroKlenze anti-flush random media.
  • Dissolved oxygen within the air bubbles transfers into the bulk liquid, stimulating the bacteria and producing a biological reaction. The requirement for this oxygen is known as BOD (Biochemical Oxygen Demand).
  • Aerobic bacteria and other micro-organisms break down organic materials into inorganic carbon dioxide, water and minerals to produce cleansed treated effluent.
  • The design of the anti-flush Bioreactor Chamber prevents the flush out of the cleansing micro-organisms during high flow activity.

Stage 3

The cleansed treated effluent passes into the Final Settlement Chamber where remaining suspended solids settle out of the treated effluent.

The result of the process produces a higher quality level of treated water to returned to the environment over standard septic tank systems, with a high rate of efficiency for the Biochemical Oxygen Demand and the removal of suspended solids.

  • Any sludge that settles on the floor of the Final Settlement Chamber is returned back into the primary settlement chamber.
  • This return of aerated treated wastewater also eliminates any foul odours.
  • The final treated discharged effluent is passed out of the HydroKlenze system into a percolation area for the even dispersion of the treated effluent into the soil structure.
  • The final cleansing treatment takes place in the soil structure before entering ground waters.
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