Types of Domestic Sewage Treatment Plants
There are 2 main types of domestic sewage treatment systems; Aeration and Rotating Biological Contactor.
When calculating the required size sewage treatment system it is important to know that domestic system sizing criteria is based on the British Flows and Loads framework given below.
British Water Sizing Criteria for Domestic Hosing
A treatment system for a single house with up to and including 3 bedrooms shall be designed for a minimum population (P) of 5
people.
The size of a treatment system for a single house with more than 3 bedrooms shall be designed by adding 1 P for each additional bedroom to the minimum single house value of 5 P, eg:
- house with 3 bedrooms = minimum 5 P system
- house with 4 bedrooms = minimum 6 P system (5+1)
- house with 6 bedrooms = minimum 8 P system (5+3)
For groups of small 1 and 2 bedroom houses or flats
- flat with 1 bedroom = allow 3 P
- flat with 2 bedrooms = allow 4 P
A treatment system serving a group of houses shall be designed by adding together the P values for each house calculated independently, eg:
- for a group of two houses (3 and 4 bedrooms, respectively) the system shall be for a minimum of 11 P (5+6)
If the calculated total P for a group of houses exceeds 12 P then some reduction may be made to allow for the balancing effects on daily flow of a group of houses (round UP not down)
- Where the total is 13-25 P multiply the total by 0.9 to give an adjusted P value, e.g. if there are four four-bedroom houses the total P will be 24 P (4 x 6) and the adjusted P will be 22 P (24 x 0.9 = 21.6)
- Where the total is 26-50 P multiply the total by 0.8 to give an adjusted P value, e.g. if there are four three-bedroom houses and three four bedroom houses the total P will be 38 P (4 x 5 and 3 x 6) and the adjusted P will be 31 P (38 x 0.8 = 30.4)
• Where there are larger groups of houses, the P should be estimated using both the expected total load and the flow, considering both
peak and total flow
• These are minimum recommended population (P) loads, they should not be modified downwards, upward modification may be necessary because of particular characteristics of each property or groups of properties.
• The above assessments of population (P) should be used for both existing and new properties. A treatment system for a single house with up to and including 3 bedrooms shall be designed for a minimum population (P) of 5 people.
Types of Domestic Aeration Sewage Treatment Systems
The Klargester BioTec is a domestic aeration sewage treatment system which operates using basic principles of aeration. The system has an electric air pump which blows air into the secondary chamber. This enables the growth of helpful bacteria on the 'media bale' within the tank which remove pollutants within the liquid waste before it exits into the environment.
The Tricel Novo
The Tricel Novo is a domestic aeration sewage treatment system which operates using the same basic principles of aeration. An air blower, which is situated above the tank lid or further away, is connected to an airline which feeds air into the tank to keep organisms within the tank alive to treat the wastewater.
The Harlequin Hydroclear is a domestic aeration sewage treatment system which operates using the same basic principles of aeration. The system comes with a weatherproof above ground external air blower housing box.
Domestic Harlequin Hydroclear Installation Guide
The WPL Diamond
The WPL Diamond is a domestic aeration sewage treatment system which operates using the same basic principles of aeration. The system has a unique shape.
The Clenviro Matrix
The Clenviro Matrix is a domestic aeration sewage treatment system which operates using the same basic principles of aeration. The system has an externally situated air blower which feeds air into the system. This system is great for driveways.
The Domestic Rotating Biological Contactor Sewage Treatment System
The Klargester BioDisc is a domestic sewage treatment system which operates using a unique rotating biological contactor. The system is powered by a motor/gearbox which turns the media discs which create an ideal environment within the system for good bacteria to grow and treat wastewater.