The truth is air diffusers clog even when they are advertised as “Non-clogging”.

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Air diffuser for water treatment, chemical reaction.OHR AERATOR

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WARNING: Beware of the following when choosing an air diffuser.


The truth is air diffusers clog even when they are advertised as "Non-clogging".

All air diffusers encounter activated sludge counterflow.

The reason why air diffusers clog. See the following.
1) When air is discharged in water, sludge counterflows into the air discharge opening(s) due to water pressure and
 negative pressure after air is discharged.
 Regardless of air diffusion method and product shape, it is the same for all air diffusers.
2) Sludge counterflow does not equal clogging.
3) More than two air discharge openings cause uneven air flow in their air passage ways causing sludge accumulation.
4) Air dries up the accumulated sludge making it unremovable.
5) The result is air diffusers clog.
OHR AERATOR doesn’t clog because it has only one large opening and one passage that prevents sludge accumulation.

Is there a rational basis for saying "Non-clogging air diffuser"?

Most air diffuser manufacturers advertise that their air diffusers do not clog. However non of the manufacturers clearly
describe the reasons for non-clogging, and they don’t show photos of their air diffuser’s use over several years or decades.
(Manufacturers of rubber porous air diffusers claim "check valve effect" that rubber shrinks and prevents counterflow of
activated sludge into their air diffusers. However porous air diffusers always clog within several months to several years so
their explanation is completely untrue and totally misleading.)
The reason why rubber porous air diffusers clog, see P.7 of "Detailed guide to air diffuser selection".

Detailed guide to air diffuser selection (PDF)

Only one large size air discharge opening is necessary to prevent clogging.

There are now many vertical air diffusers on the market, which have large air discharge opening(s) and inside structures.
Some vertical air diffusers have more than one air discharge opening. This means that the blown air has to pass through branched
and narrowed airflow paths inside the air diffusers before being discharged through the openings causing sludge accumulation
in the air passage ways due to uneven-weak air distribution. The sludge will accumulate and dry up inside the air diffusers due
to hot air that can be over 80°C in the summer) causing clogging. This is the same reason rubber porous air diffusers clog.
There are also vertical air diffusers that catch biofilm carriers of MBBR system or trash (fallen leaves etc) unintendedly because of
their complicated and over-dense inside structures. Unlike rubber porous air diffusers, vertical air diffusers suck activated sludge into
their inside structures causing clogging if their inside structures are too complicated and over-dense.

The reason why the OHR AERATOR doesn’t clog is simple and straightforward.

The reason why the OHR AERATOR doesn’t clog, see the P.7 of "Detailed guide to air diffuser selection".

Detailed guide to air diffuser selection(PDF)

If you select the wrong air diffuser it will clog and you will have to replace it periodically. The wastewater treatment condition
wil get worse due to air diffuser clogging and hinder the stable operation of your factory.
Rubber porous air diffusers are famous for clogging, but it is not so well known that vertical air diffusers can clog because they
are new to the market. Please be careful.

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