PUREFLO Biodigester Sewage Treatment Plant

PureFlo™ Biodigester Sewage Treatment Systems

Designed for use where the installation of a septic tank is either unacceptable or impractical and a connection to the main sewer impossible.

The PureFlo™ biodigester domestic sewage treatment plant offers an extremely efficient and unobtrusive means of sewage disposal.  The PureFlo™ Biodigester is a three stage sewage treatment plant.  Manufactured entirely from robust and corrosion free materials, the PureFlo™ biodigesters incorporate unique and patented features to ensure simplicity and efficiency of operation whilst being able to consistently achieve the ever more stringent standards of discharge effluent quality being required by the Environment Agency.  Available in a range of sizes to suit virtually any application from a single residential property, hotels and restaurants or a major industrial / commercial complex, the PureFlo™ meets the specific requirements of each individual situation.

The PureFlo™ Biodigester has the EN 12566-3 2005.

Checklist

Features of the PureFlo™ Biodigester 6 to 300 person sewage plant range

• EN 12566-3 certified
• Very low electric consumption
• Very clean effluent giving 11mg/litre BOD and 7mg/L Ammoniacal Nitrogen
• Very Quiet operation
• Gravity and pumped outlet options
• Alarms are standard
• 25 year tank warranty
• Can be designed to be installed above ground if required
• Can be made to suit any drain depth
• Sludge Return facility enables holiday absences and denitrification
• Above ground installation option
• Mobile, containerised sewage treatment system option for oil fields, refugee camps, disaster zones, etc.

The PureFlo™ system has been tested for 38 weeks in Germany for BS EN 12566-Pt3 and has produced some of the best results in the market place, 20BOD-30SS-20NH4 being the standard to achieve.

The PureFlo™ sewage plant actually achieved a 96.2% treatment efficiency ratio in the EN 12566-3 2005 test, which equates to 11BOD-16SS-7NH4, a far better quality of effluent than the vast majority of the competition.

The PureFlo™ also passed the far more stringent French Test 'A1 2009' where it was subject to 200% overloading.

The PureFlo™ treatment plants are offered with a 25 year warranty on the tanks and a 2 year blower warranty. Our price also includes for a compressor failure alarm system as standard, which also forms part of the mandatory requirements.

Installation of the PureFlo™ biodigester requires no specialist equipment and can be carried out by any competent contractor, quickly and simply. Once installed, the PureFlo sewage plant is completely unobtrusive, even the largest plants.

Details of the PureFlo™ Biodigester Package Sewage Treatment Plants

The diagrams show a larger plant for ease of reference, bu the smaller circular plants (up to 18 persons) use an identical process.

The PureFlo™ wastewater treatment plant is of a single tank design and incorporates Primary Settlement (PST) Biological Treatment (Biozone), and Final Settlement (FST) within the same structure, allowing delivery to site as a complete unit to provide for a simple and straightforward installation. No other tanks are required except for larger applications ( over 300 p.e. ) where a modular system is provided or where additional treatment may be required to achieve more stringent effluent quality standards or where effluent re-use is proposed. The PureFlo™ sewage treatment plant has been designed to optimize the aesthetic qualities of the final installation by ensuring that there is minimum visual impact. The PureFlo™ process is also designed in accordance with the requirements of BS 6297.

Primary Settlement Tank

Raw sewage enters the  primary settlement tank (1) The Primary settlement tank is a two stage tank designed to maximize the removal of gross and suspended solids prior to transfer of the settled effluent to the 2 stage biozone (2) for treatment. The primary settlement tank also incorporates for a sludge storage volume (based on full load) depending on the desludge periods as identified for individual applications.

Biodigester Biozone

The biological treatment phase (2) of the sewage treatment plant utilizes BAF technology (biological aerated filter) which incorporates two proven principles of biological process in the form of a fixed film reactor for process stability and a suspended floc dispersed growth system for high transfer rates and operational control, to ensure a stable treatment process which is largely unaffected by shock loads. Air is blown in from the blower unit (3), housed in a Kiosk which is supplied with the PureFlo™ plant. The sewage treatment process incorporates a submerged, high rate, plastic media on which a fixed film of biomass is grown. This film takes nutrition from the incoming settled effluent and is provided with oxygen by means of a small blower unit which aerates the media through HDPE membrane diffusers to provide fine bubble aeration. The action of the fine bubble aeration is carefully controlled to provide optimum oxygen transfer rates and to provide a scouring action to slough off excess biomass to keep the thickness of the fixed biological film at optimum levels, thereby preventing the production of anaerobic bacteria and ensuring maximum sewage treatment process efficiency. The fact that the media remains submerged allows for an element of suspended floc dispersed growth, which basically means that there will be biomass which is unfixed to the media but achieving sewage treatment through suspended aeration.

The biozone incorporates a two stage process as standard that allows for constant mixing of incoming settled effluent to provide optimum treatment stability and to avoid any short-circuiting. The use of a two stage biozone in the sewage treatment plant ensures a high degree of process efficiency to not only reduce B.O.D. levels to that required, but will also achieve reductions in ammoniacal nitrogen way in excess of standard requirements

Final Settlement Tank

The final settlement tank is designed in accordance with the requirements of BS 6297 to ensure relevant surface areas and rise rates are achieved to provide maximum settlement of any suspended solids prior to discharge. The PureFlo™ sewage system also incorporates continuous and automatically timed humus sludge return systems (4) to return humus sludge from both the final settlement tank, back to the primary settlement tank. Additionally this sewage system also provides for continuous recycling of treated effluent back to the P.S.T. to not only provide dilution of incoming wastewater, but to also ensure continuous flow during periods of low or no flow, thereby keeping the biomass in prime condition. Clean water exits the tank via the outlet (5).

PureFlo™ 25 person plant installed

Servicing PureFlo™ sewage plants is arranged through Sapphire Environmental Ltd.

DOWNLOADS

PureFlo™ 6 person installed by KPH Drainage Ltd Sussex.