Sewage Treatment Plants

The sewage treatment process falls into two main categories: electrically operated and non-electric sewage treatment systems.

These systems are often called Bio Septic Tanks or Bio Sewage Systems.

There is no such thing as the PERFECT sewage treatment plant - although the manufacturers will all claim that theirs is the BEST. Each type has plus and minus points, depending on the individual site and some types are not suitable for low occupation or intermittent use, although, again, the manufacturer will often not disclose this. Please click below for details of our domestic and commercial sewage treatment units.

Non Electric	Electric	Electric	Electric
BIOROCK	PureFlo	ClearFlo	Crystal CUBE
			Above Ground Plant

Other Information

• Sewage Treatment Options
• Percolation Tests
• Soakaway advice, design, and installation
• Can roofwater go into a sewage system?
• Surveys
• Septic Tank - Sewage Treatment Plant - DIFFERENCES
• New sewage regulations, EPP2 legislation and EN 12566-3 2005
• Which is the current British Standard for wastewater treatment systems?
• Extended aeration explained
• Our Treatment Services
• Optional extras and spares

Domestic sewage treatment plant systems are used when it is not possible to install a septic tank. This is often due to high water tables, high levels of bedrock or clay soils giving poor soakaway test results. They solve many drainage disposal problems when mains drains are not available.

Crystal Tanks can survey your individual site and recommend which system, either a septic tank or a particular wastewater treatment unit, would be most suitable.

The electric systems consist of a small electrically driven packaged unit, usually all contained in one tank or housing. The sewage is first settled to remove the gross solids and then biologically treated in a biozone, consisting of rotating discs, or air injection, with a final settlement stage to remove the fine solids. The effluent is discharged about 95% clean, to a land drainage system or watercourse, (subject to Local Authority and Environment Agency Consents). Maintenance and emptying of the system is required at regular intervals. There are many variants of packaged plants available on the market; the PureFlo, Clearflo and the Crystal CUBE are three of them.

The non-electric treatment process uses natural air currents to power the process; the BIOROCK is an example of this.