Fine Bubble Diffused Air Systems

Membrane Diffuser Features

- High quality, precision engineered product

- Durable EPDM Membranes

- Low capital and maintenance cost

- High transfer efficiency reduces aeration power usage

- Mechanical fixings increase strength and are suitable for a wide range of pipe materials

Range of Product Applications

- New sewage treatment projects

- Retrofit to existing plant

- Complete diffuser, pipework and blower systems

A range of technical and commercial advances borne out of over 25 years of Naston wastewater treatment experience worldwide:

Naston Envicon diffusers are a high quality product. The manufacturing process places special emphasis on the EPDM membranes, as the finish quality can be a decisive factor in the life span and thus economics of the fine bubble aeration systems.

The Naston Envicon diffuser systems have been used on well over 500 waste water treatment projects in countries across Europe plus Bahrain, Peru, Mexico, Thailand, Japan, Tunisia and China. Projects have included municipal and industrial treatment systems, landfill leachate and pharmaceutical waste. The EPDM diffusers are also suitable for high temperature waste. The wide variety of products in the range ensure any type of waste can be aerated with confidence.

Naston Envicon are able to offer diffusers for retrofit or replacement of existing, as well as engineered packages including supports, pipework, blowers and control instrumentation. Full turnkey treatment systems are also available. Process guarantees can be provided on all work packages.

Treatment Solution Providers
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EMR

Naston Envicon EMR tubular membrane diffusers are normally mounted to the aeration grid in pairs. A special fitting is supplied with the membranes for connection to either box-section or cylindrical pipework. The air supplied to the diffuser passes through special threaded nipples that are bolted to the distribution chambers of the membrane tube. Process air gets beneath the membrane tube via air ducts. An air cushion builds up beneath the membrane, causing the perforations to open and air to pass into the surrounding liquor.

Three standard sizes are available:
EMR 10: 500mm long (1000mm per pair)
EMR 15: 750mm long (1500mm per pair)
EMR 20: 1000mm long (2000mm per pair)

Special versions of the standard EMR are available for use in waste waters which are not suitable for EPDM.

EMS

Naston Envicon EMS disc membrane diffusers are produced using highly specialised manufacturing process. Shaping of the membrane is by vacuum injection moulding - a process excluding air inclusions and ensuring super-fine membrane slits, suited to intermittent aeration.

Process air gets beneath the membrane through a central port, forming an air cushion. This causes the membrane perforations to open, allowing air to pass into the surrounding liquor. The tension ring reinforcement within the diffuser permits the membrane to change its deformation behaviour and depress on cessation of air with no additional mechanical means. In addition, as the membrane sinks, a central stopper creates a seal within the air inlet port, providing additional protection to the system.

Adaptors and Support Fittings

The range of Naston Envicon diffusers is complemented by the specialised fittings which ensure that each installation is completed with optimum efficiency. This reduction in installation manpower required for each diffuser leads to considerable savings in overall system cost.

Fittings are available for box section or cylindrical pipework (up to 110mm diameter) and can be connected to any pipe material. The fittings are also available in a variety of materials to suit prevailing effluent conditions. The use of standardised fittings ensures a correct horizontal orientation and permits adjustment for equalisation of diffuser height.