Overview
Tertiary treatment
The Puraflo Multiple Module or Peat Filter Bed, the Moving Bed Biological Reactor (MBBR) and the Platinum Small Community System package treatment plant can be followed by:
- Puraflo Peat Filter for tertiary treatment
- Backwash Sand Filter
Puraflo Peat Bio-Filters
The Puraflo Peat Bio-Filter is ideally suited for tertiary treatment across a range of applications, including single-house and larger developments.
The Puraflo system for tertiary polishing has the ability to deal effectively with fine solids that cannot be settled in a secondary treatment aeration system, but can be removed in the peat filter.
The physical and biological nature of treatment of a peat filter allows residual recalcitrant solids to be trapped on the peat fibre, allowing a long retention time for degradation.
The conditions within the peat filter are particularly conducive to an additional reduction of coliforms and pathogens from that achieved in a secondary treatment system.
The surface area of the peat filter for tertiary treatment is relatively small. Modular and site-constructed configurations of the Peat filter are available for tertiary treatment of wastewater.
Quality of treated wastewater:
BOD 10mg / l
TSS 10mg / l
Backwash Sand Filters
At Anua we also offer high-rate Backwash Sand Filters which follow on from a secondary treatment system to achieve effective tertiary polishing.
Benefits of Sand Filters are that:
- They have a very small footprint area, making this option an effective and efficient way of reaching the required consent levels
- They act as a final stage treatment process to remove a minimum 60% suspended solids and 40% biological oxygen demand (BOD)
- They can be installed above or below ground
- Influent can flow by gravity or be pumped into filter unit
- Backwash removes solids trapped in sand filter media and waste backwash water is returned to the plant for re-treatment
- Units are sized to tackle various flow rates
- Population equivalents up to 600, multiples thereafter
Sand Filter Elevational View
Sand Filter Plan View
