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HERE-Video of Flushing Gate in action.
The GNA HYDROSELF flushing system is a highly effective
cleaning system which requires no electricity, no maintenance and no fresh
water. There is virtually no limit on flushing length as more flush water may
be stored without incurring any additional construction or operating costs.
The GNA HYDROSELF is a simple method for sediment removal.
Flush water is held in reserve in the storage basin. This flush water, released
by a patented mechanism, gives rise to a high celerity wave that effectively
removes all accumulated debris in basins and interceptors over flushway lengths
greater than any other available method.
True to its name,
the GNA HYDROSELF, is a self
contained system. It operates without any external power or water supply and
requires no complicated controls. Its success has been proven over the years
through hundreds of operating European installations. The device's high
operating reliability results from a mix of fine engineering coupled with
robust construction as well as quality materials such as brass and stainless
steel in its design. The few moving parts are more than amply designed and
dimensioned, thus reducing maintenance to practically nil.
The
self-contained GNA HYDROSELF
system has these main features:
- The gate which holds back the stored water.
- The float control mechanism for the gate, which is operated by a
closed circuit hydraulic system.
- The system may also be operated using electric controls, if
desired, with power usage < 1.0 kW.
GNA HYDROSELF may be used to
flush waste water equalization tanks, CSO retention tanks or storm water
run-off detention systems. After the water is drained from the tank, the
flushing system is automatically activated thereby producing a high celerity
wave. Accumulated debris and pollutants are washed from the tank floor and
returned to the waste water treatment plant.
GNA HYDROSELF may also be used in interceptors. Activating
the flushing wave not only regularly flushes the interceptor system, thus
increasing capacity, but it also reduces the pollutants concentration peak thus
reducing the negative impact on waste water treatment plants.
The HydroSelf flushing system keeps sewers
clean
ADVANTAGES
OF THE GNA HYDROSELF
- No limitation on flushway length; several devices may be installed
in series.
- No external power required.
- No external water supply required.
- No maintenance required.
The functioning
Highly polluted
water flows through the prethrottle ➀ to the outlet. Inlet
amounts larger than outlet amounts impound starting at the outlet. The floats ➅ are lifted and thus the
flushing gates ➄ are locked by an encased, hydraulic transmission. Due to
the prethrottle ➁, income water in the prechamber
impounds more quickly than in the remaining retention system. By using
backwater gates ➂ water flows early into the storage chamber ➃.
Thus a filling of
the storage chamber is also guaranteed with a partial filling of the retention
system. After each filling –even after partial filling – the
flushing gates are unlocked by the falling floats with a lowest water level.
This takes place subsequently, as the flushing sump shall remain as small as
possible and the pollutants shall not be flushed all together. If the prethrottle is closed, it is possible to flush manually. A
single flushing wave is sufficient to flush reliably long tanks and channels
even with low storage chambers.