2012 - Europe Direct Iasi

EUROINVENT 2012
CLASS 1.
Environment - Pollution Control
1.1.
Title Final Settler for a Dissolved Air Flotation Unit
Bogdan Dumitru NĂSĂRÎMBĂ GRECESCU, Gabriel
Authors
PETRESCU, Ioana Corina MOGA
University POLITEHNICA of Bucharest
Institution SC DFR SYSTEMS SRL
University POLITEHNICA of Bucharest
Patent no. Patent application No. 0073/2011
A dissolved air flotation unit consists of two separate devices:
pressurized capsule and lamellar settling. The settling is made of
two functional compartments arranged in series: a lamellar settler
and a technical room. At the usual clarifiers, the settling plates can
clog. In order to overcome this anticipated difficulty a flotation
system is used. The two-phase mixture air-water enters the clarifier
through a transport system that consists of pipes and three funnels.
Funnels are diffusers (relaxation area for the compressed fluid). In
this way, the mixture bubbles - water does not "wash" the slab
foundation. Air bubbles rise to the free surface and become stuck in
"light" suspended solids and are led to the surface, where they are
Description directed to skimmer and discharged from the system. Sludge is
deposited at the bottom of settler and treated water is discharged
through a pipe into the emissary. Well designed plates systems,
mounted obliquely (60 0 ) provide an efficient settling for the entire
clarifier length. The rectangular cross section of the settling and
interior construction ensures stability of the liquid and sludge
retention. The settled sludge from the bottom of each bioreactor and
settlement stage is collected through a system of connected suction
pipes. This sludge is pumped through the hydrociclone by the
sludge pump from the technical chamber. Dense mineralized sludge
is downloaded periodically into the drying system in bags where it
is manually removed after deshidratation.
Class 1
37
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