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Envirosafe

Advanced Sewage Treatment Systems

Introducing the new Envirosafe range

Heightened environmental standards, more stringent controls, new European guidelines and the introduction of new Building Regulations have placed greater importance than ever before on the need to install correctly sized and specified sewage treatment plants.

Such sewage treatment systems have to deliver high performance, but also be capable of supporting future demand, not just current level of use.

The requirement for a more flexible plant has led to the development of Envirosafe – a wholly new range of sewage treatment plant to meet the demands of today’s consumer.

We have drawn on over 40 years of expertise in sewage treatment plant technology in order to meet our own strict criteria in the development of the Envirosafe plant:

• High and medium rate performance options across a range of influent and effluent qualities
• Adaptable to specific consent requirements including ‘Total Nitrogen’
• Low head loss
• Minimal footprint area
• Single piece tank for rapid installation and reduced costs
• Variable invert options
• Minimal visual impact (below ground)
• Low running costs
• May be installed in trafficked areas (subject to loading)
• Compliant with EN-12255
• Designed for applications selected in compliance with British Water Code of Practice Flows and Loads
• Low maintenance
• Alarm protected

Process Design

Envirosafe sewage treatment plants employ a plug flow combination of aerobic and anoxic processes in a fluidised bed arrangement. This operates in conjunction with an advanced system of air diffusers and selected media to deliver optimum levels of purification.

This process takes place in three distinct stages:-

1. Primary Settlement
This is the initial stage of treatment and simply involves the retention of coarse solids present in raw sewage and wastewater for subsequent gradual breakdown. Envirosafe features two chambers to ensure efficient operation with a flow balancing facility.

2. Biological Treatment
Substantial BOD reduction takes place here, where the carbonaceous pollutants are removed by presenting the sewage to the micro-organisms in the presence of oxygen. The treatment is achieved by high efficiency air diffusers continually pumping oxygen through the biological media and fluidised effluent. Standard Envirosafe models utilise two aerobic treatment chambers for lower performance applications. Where higher effluent standards are required, the HEQ models employ a third anoxic zone.

3. Settlement
A natural by-product of biological sewage treatment is humus sludge and this is separated for further treatment. The treated effluent is discharged via the outlet.

Total nitrogen consents can be achieved with HEQ models (contact our sales office for your application).

Click here to download a PDF of this illustration

Flow Management

Envirosafe’s design incorporates flow management in order to both stabilise influent volume variations and to minimise hydraulic impact on the final settlement process. Such control ensures that final effluent remains at a consistently high quality.

Options

• Medium (MEQ) and high (HEQ) effluent quality configurations
• Choice of inverts (from 0.5 to 2.0m)
• Duty and Standby blowers (as required)
• Alarm Systems
• Sample chambers
• Pumping stations
• Extension shafts (to 2.0m maximum standard invert)

Envirosafe Technical Specification

High Effluent Quality (HEQ) Models	34H	38H	42H	47H	55H	67H	80H
Medium Effluent Quality (MEQ) Models	**	38	42	47	55	67	80
A Overall Length (m)	7.4	8.1	8.9	9.7	11.2	13.5	15.8
B Overall Width (m)	2.8
C Height (m) 560mm Inlet / 860mm Outlet Invert* 1060mm Inlet / 1360mm Outlet Invert* 1560mm Inlet / 1860mm Outlet Invert* 2060mm Inlet / 2360mm Outlet Invert*				3.02 3.52 4.02 4.52
D Diameter (m)	2.6
Volume (m3)	34	38	42	47	55	67	80
Weight approx (kg)	3000	3200	3400	3800	4200	4700	5400
Inlet / Outlet Diameter (mm)	160
Maximum flow (m3/day) HEQ models	15	20	25	30	40	50	60
Retention time (hrs)	51	43	39	35	31	31	30

Notes:
* Extension necks can be added to turrets to achieve deeper inverts. Alternative pipe sizes may be ordered. For deep intallations over our standard 2m invert, we recommend an independent civil engineer advice be sourced.

Weights are dry weights and installers must ensure there is no water in the tanks before lifting. All weights are approximate. Klargester reserve the right to alter the above dimensions without prior notice.

Service & Maintenance

Envirosafe’s individual chambers have large dedicated manholes to allow quick and easy maintenance access. Servicing is also simplified as Envirosafe’s flow control makes it unnecessary to empty the biozones, as is the case with other designs of sewage treatment plant.

As a result, the biozones immediately resume operation following servicing, whilst the influent level is restored. As a result there is no loss of plant performance during periodic maintenance.

Specialist Advice

Delivering high quality effluent requires careful evaluation of the various parameters affecting each scheme. Relatively minor changes may result in the loss of one or more of the required effluent qualities.

Klargester’s team of technical specialists assess each site’s demands and application and tailor a technical specification to meet the consent requirements.

Plant sizing is not only calculated on current demand but also gauged on potential future loading in order to meet the latest legislative criteria.