Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Fluidized bed
Patent
1995-07-26
1997-06-10
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Fluidized bed
422145, 422147, 422213, 210274, 210275, B01J 822, B01D 2436, B01D 2446
Patent
active
056372787
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a treatment device of the kind having a particulate treatment bed for the treatment of a liquid flowing through the treatment bed.
The particulate treatment medium has to be periodically rejuvenated which generally requires the treatment device to be taken off line while it is backwashed in situ, or the treatment medium is removed for rejuvenation or is replaced, leaving the treatment device out of action for considerable periods.
According to the present invention a treatment device comprises a housing containing a treatment bed of a particulate treatment medium, and having an inlet for liquid to be treated and a treated liquid outlet; a fluidising unit, associated with the treatment medium, for removing the treatment medium particles from the treatment bed, the fluidising unit comprising a liquid supply duct having an outlet and which is arranged to be fed with liquid under pressure from outside the filter bed, and a discharge duct within the liquid supply duct, having at its end an inlet and projecting beyond the outlet of the liquid supply duct, for the discharge of liquid and treatment medium particles from the bed; and means for supplying new particulate treatment medium to the top of the bed.
Such a fluidising unit ensures that the treatment medium particles can be removed efficiently from the bed without contacting a pump impeller. The treatment medium removed through the discharge duct is replaced by particles from above which fall under gravity or pressure into the space created by the evacuation of the treatment medium. In this way the treatment medium will tend to progress down through the treatment bed, ensuring that all of the bed can be cleaned cyclically.
The material which has been removed from the bed may be lead to a rejuvenating means, wherein it is rejuvenated and reused, or may be disposed of or made use of elsewhere. For example if the particles of the treatment medium are combustible, the treatment might be to filter and hence de-oil oily water, thereby increasing the calorific value of the particles and enabling them to be used as a fuel.
It is therefore possible gradually to remove the particulate treatment medium from the treatment bed for rejuvenation while the treatment device is still on line.
Fluidising units of a type suitable for use in the present invention are disclosed in our earlier U.S. Pat. Nos. 4,978,251, 4,952,099 and 4,992,006.
The operation of the fluidising unit may be improved if the liquid supply duct has means for swirling the liquid.
Preferably the fluidising unit is situated near the bottom of the treatment bed so that the treatment medium removed through the discharge duct is replaced by particles from above which fall under gravity or pressure into the space created by the evacuation of the treatment medium. In this way the treatment medium will tend to progress down through the treatment bed ensuring that all of the bed is cleaned cyclically.
The treatment device is particularly effective as a filter device wherein the rejuvenating means is a separator for separating contaminants from the treatment medium.
Conventional filters have to be backwashed when the filter bed becomes clogged by contaminants. This requires liquid to be drained from the filter bed, air to be blown through the bed to break it up and water to be passed back through the bed to wash out the contaminants. This not only causes the filter to be off line for long periods but also results in lost water and some lost particles of filter medium.
The use of the treatment device of the present invention as a filter provides rapid on-line cleaning of the filter medium. This leads to the advantage that a filter medium having a small particle size or a shallow bed can be used as, due to the speed of cleaning, the solids holding capacity is less important than with a conventional filter. The filter medium washed out through the discharge duct is cleaned and may be returned to the original or another filter bed. This reduces the net amount of filter medium lost from
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Adams John E.
Delves James E.
Smith Robert M.
Dawson E. Leigh
Merpro Tortek Limited
Warden Robert J.
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