oxyflex -mt 235 Â® membrane-disc-diffuser - Supratec

BELÜFTUNGSTECHNIK 

UMWELT- & VERFAHRENSTECHNIK 

SERVICE & WARTUNG 

G E N E R A L 

I N F O R M A T I O N 

OXYFLEX 

® 

-MT 235 

MEMBRANE-DISC-DIFFUSER 

For fine bubble aeration of liquids 

Supratec 

GESELLSCHAFT FÜR UMWELT- 

UND VERFAHRENSTECHNIK MBH 

von-Drais-Straße 7 

D-55469 Simmern/Hunsrück 

Fon: +49 (0) 67 61 9 65 09-00 

Fax: +49 (0) 67 61 9 65 09-01 

E-mail: info@supratec.cc 

Internet: www.supratec.cc


Gesellschaft für Umweltund 

Verfahrenstechnik mbH 

OXYFLEX®-MT 

General 

Information 

Design 

Membrane 

Supratec Gesellschaft für Umwelt- und Verfahrenstechnik mbH produces modern 

high efficient aeration systems, which are mainly used for oxygen transfer into 

biological waste water treatment. These products can also be used for any kind of 

transfer of gases into liquids 

OXYFLEX ® is the brand of membrane diffusers (plate, tubes and discs) with a 

plastic body. 

The extra ordinary characteristics of OXYFLEX ® - MT membrane disc diffusers are 

given by its shape and the materials used. 

• OXYFLEX ® -MT 235 (free membrane area) 235 mm 

The body is a round plate, made of glass reinforced made of Polypropylene. The 

membrane is fixed to this body with a plastic ring made as well of glass reinforced 

made of Polypropylene. 

Standard-membrane is made of EPDM. 

Membranes made of Silicone and Polyurethane are partially available. 

The membranes have a special slot-arrangement. Size and arrangement of those 

slots is optimized to reach maximum oxygen transfer efficiency. 

Characteristics 

Performance 

Combination 

Variations 

OXYFLEX ® - MT membrane disc diffusers have low pressure loss. 

OXYFLEX ® - MT membrane disc diffusers produce fine bubbles of a medium 

diameter < 2 mm. 

OXYFLEX ® - MT membrane disc diffusers are highly resistant against soiling. 

As, in difference to tube diffusers, the whole active diffusers surface is at the same 

hydraulic level, the membranes are gazing evenly among the full range from 

minimal to maximal air flow. So, lifetime and efficiency is optimized. 

OXYFLEX ® - MT membrane disc diffusers can be operated intermittently. 

OXYFLEX ® - MT membrane disc diffusers can be used for all geometric forms of 

tanks, but they are extraordinarily good for small tanks and grit chambers or first 

high loaded stages. 

OXYFLEX ® - MT membrane disc diffusers are well established and are working to 

the clients satisfaction world-wide. 

OXYFLEX ® - MT membrane disc diffusers are compatible to PERMOX ® -T ceramic 

disc diffusers. 

OXYFLEX ® -MT membrane disc diffusers have a wide range, OXYFLEX ® -MT 235: 

0 - 8 Nm³/h. 

The design air flow shall be about OXYFLEX ® -MT 235: 5 ± 1,5 Nm³/h. 

OXYFLEX ® -MT membrane disc diffusers can reach specific oxygen transfer 

efficiency up to 25 gO 2 /Nm³xm sub , if coverage and water depth is favourable. 

For plants with partly intermittent operated tanks, OXYFLEX ® -MT membrane disc 

diffusers can be combined with PERMOX ® - T ceramic disc diffusers. However, 

different pressure losses have to be considered 

Modified OXYFLEX ® - MT membrane disc diffusers are also available for drinking 

water purposes. 

OXYFLEX ® - MT membrane disc diffusers are also available as coarse bubble 

diffusers 

Stand: December 2009 

Supratec Von-Drais-Straße 7 • D-55469 Simmern • Fon: +49 (6761) 9 65 09-00 • Fax: 9 65 09-01 • info@supratec.cc • www.supratec.cc




® 

D R A W I N G OXYFLEX MT 235 

Membrane - Disc - Diffuser 

® 

Membrane-disc-diffuser OXYFLEX -MT 235 

are fixed with ist male threat (standard 1“) to 

a suitable female threat of the distributor. 

Materials: 

Body: Polypropylene (PP-GF) 

Ring: Polypropylene (PP-GF) 

Gasket: EPDM 

Membrane: Silicone 

EPDM 

Membrane area: 0,04 m² 

Detail: NON-Returne Valve 

Gasket 

PP- Body 

Air-Socket 

Nippel R1" 

Membrane 

Gasket 

Ring PP 

Gewinde G 1" 

Membrane 

OXYFLEX 



C U R V E S 

OXYFLEX -MT 235 


FOR FINE BUBBLE AERATION OF LIQUIDS 

® 




Pressure - Oxygen 

® 

OXYFLEX -MT 235 membrane disc diffuser are high efficient diffusers, as they are mainly used for oxygen 

supply of biological waste water treatment plants. 

Beside procedural necessities important criterions to select the matching fine-bubble aeration-technology 

are features of a product. 

® 

OXYFLEX -MT 235 membrane disc diffuser are designed at a specific air-flow of 5 Nm³/h per unit. 

This is a good compromise between Invest -, overheads and range. 

The following table is showing figures, which are represented from an oxygen-efficiency-test. 

The values have been reached in a round-basin with water-depth of 3,3 m, submerge of diffusers of 3,02 m 

and coverage of 8,4%. 

Those values are not transferable on other installations, as the deviation even more than ± 25%. 

® 

SUPRATEC GmbH likes to produce a data-sheet for individual application-cases on inquiry. 

No guarantee-claims can be derived from the diagram! 

30 

specific O2-entrainment standard conditions and 

pressure loss 

® 


∆p OC 

50 

OCL,h [gO2/(Nm³ x m sub)] 

25 

20 

15 

40 

30 

20 

∆p [mbar] 

10 

10 

0 2 4 6 8 

specific load [Nm/h] 



I N S T A L L A T I O N 




® 




M A N U A L 

Description 

® 

OXYFLEX -MT 235 – membrane disc diffuser has a solid, strengthen, 

horizontal body, made of glass-reinforced Polypropylene and a slipped 

over membrane (e.g.: EPDM). 

The uniform ring, made of glass-reinforced Polypropylene ensures the 

proper location of the membrane. 

The body has a connecting-threat (standard 1“-male). 

Measurements 

Diameter: 255 mm, Height: 30 mm 

– (The clamp is not considered in here) 

Free membrane area: Diameter 235 mm (0,04 m²) 

Storage 

Preparation 

The diffusers shall be stored in their packing inside a dry and aerated 

building. DIN 7716 has to be considered 

® 

Before installation of OXYFLEX -MT 235 – membrane disc diffuser it 

has to be checked that the piping system is clean. 

Drilling chips, dirt etc. have to be removed, because those will cause 

serious damage to the diffusers’ membranes as those will be transported 

into the diffusers as soon as blowers are set into operation. 

Levelling 

Installation 

® 

OXYFLEX -MT 235 – membrane disc diffuser will be installed onto 

round pipes. The piping system has to be levelled to maximum ±10 mm. 

® 

OXYFLEX -MT 235 – membrane disc diffuser are fixed to the 

distributors’ female threat or similar. 

It is to be taken care of a horizontal seat of the diffusers. 

Between diffuser and female threat must be placed a flat gasket made 

of EPDM. The surfaces of all parts need to be clean and may not be 

damaged. 



O P E R A T I O N 




® 




M A N U A L 

Function 

and 

Leakage check 

First run of 

diffusers 

Visual bubble 

check 

Oxygentransferefficiency 

test 

Start up 

After installation of OXYFLEX ® -MT 235 membrane disc diffusers a 

function- and leakage test has to be done. 

Therefore the tank shall be filled with clean water up to maximum 10 cm 

above diffusers’ surface and the diffusers shall be set in operation. 

(specific air flow: 5 Nm 3 /h per unit) 

Then function and installation can be checked and confirmed by report. 

After function and installation has been checked and confirmed 

OXYFLEX ® -MT 235 membrane disc diffusers have to be operated at 

least another 60 hours continuously, at a specific air flow of minimum 

5 Nm 3 /h per unit. 

Water level shall be as quick as possible raised up to minimum 100 cm 

above diffusers’ surface. 

IMPORTANT: ● Diffusers may not stand still 

● 

Specific air flow may not exceed 8 Nm 3 /h per unit 

The judgement of the visual impression of bubble distribution shall not 

take place before the above specified first run of diffusers. 

To do the visual check, the diffusers shall operate at maximum capacity 

and shall be turned down to the minimum. 

• 

Test of evenly aeration (visual bubble check) must take place when 

the water level is at least 60-100 cm above diffusers surface and a 

specific air flow of at least 5 Nm 3 /h per unit. 

• 

Test of evenly aeration (visual bubble check) at minimum air flow can 

only take place if the water temperature is above 10°C. 

Before the stated oxygen transfer efficiency figures of OXYFLEX ® -MT 

235 membrane disc diffusers are proved with an the oxygen transfer 

efficiency test, the above mentioned steps have to be considered. 

The oxygen transfer efficiency test must be done accordingly to 

accepted rules (e.g.: ATV-M 209) in clean or waste water. 

Guaranty figures have to be controlled exactly. It is necessary to have a 

precisely air-flow measurement system. 

After successful oxygen transfer efficiency test the start up OXYFLEX ® - 

MT 235 membrane disc diffusers may follow immediately. If there is a 

postponement of the start up, it has to be taken care, that the water level 

stays at least 100 cm above diffusers surface to prevent OXYFLEX ® -MT 

235 membrane disc diffusers from sunlight and / or freezing. 



M A I N T E N A N C E 




® 




M A N U A L 

Maintenance 

Supervision 

Warranty 

OXYFLEX ® -MT 235 membrane disc diffusers do not need a lot of 

maintenance. Usually it is enough to have one run of 10 to 15 minutes 

operation at maximum air-flow per day, where each single OXYFLEX ® - 

MT 235 membrane disc diffuser shall operate at a specific air-flow of at 

least 5 Nm 3 /h per unit. 

To do so, it may help to shut down the system partially, by closing the 

corresponding valves. 

This also removes layers of sludge after longer time not having 

operated the system or longer terms of low specific air flow. 

At least once per year OXYFLEX ® -MT 235 membrane disc diffusers 

shall be checked visually. Here especially shall be checked whether 

there are layers of sludge or similar. If so, those layers shall be removed 

carefully. 

A separate maintenance-contract can be completed 

A Visual bubble check has to be done daily. The pressure loss of the 

system has to be controlled and reported monthly. 

Showy changes of the bubbles’ distribution and/or of the pressure-loss 

are prompt to report at SUPRATEC. Especially at installations with 

intermittent operation exists the risk, that activated sludge penetrates 

the entire piping, by damaged OXYFLEX ® -MT 235 membrane disc 

diffusers. Hereby, all OXYFLEX ® -MT 235 membrane disc diffusers are 

affected in function and lifetime. 

The maximum of SUPRATEC GmbH's warranty for Membrane disc 

® 

diffuser OXYFLEX MT is 24 month. 

Longer warranty can be arranged only with conclusion of a maintenance 

contract between the operating and SUPRATEC GmbH. 

Damages and/or outer influences are specifically excluded from the 

warranty promise. 

The warranty ends if it known, that sewage is partially mainly full of 

industrial origin and/or the sewage has damaging influence on membrane 

diffusers and the SUPRATEC GmbH was not informed accordingly. In such 

case, a confirmation of the warranty is to be ordered through the 

SUPRATEC GmbH. 

The correction of vaults in the warranty is to determine by approval. In 

case of warranty starts a 2 year long warranty for the changed diffusers. Is 

the first warranty longer running, it apply till it ends. 






Here are shown Photos of Membrane-Disc-Diffuser 

OXYFLEX MT in operation

oxyflex -mt 235 Â® membrane-disc-diffuser - Supratec

Create successful ePaper yourself

Delete template?

Save as template?