Machines for sludge treatment by NatePotter

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									Machines for
sludge treatment
            Products & Services
sludge thickening, sludge dewatering and process filtration
Top: Detail of chamber   Bottom: Thickened
filter press             sewage sludge
Products & Services

Mechanical liquid separation
System solutions for municipal a. industrial applications   Extensive product range
Increasing demands on the quality of wastewater,            Powerful thickener mechanisms with low mainten-
rising concerns regarding methods of disposal which         ance requirements aid static gravity sedimentation and
have been practised for many years and the recovery of      remove the sludge deposits.
raw materials from wastewater are at present the
framework for the planning of sustainable technologies      Belt thickener and drum filters, belt filter presses and
for wastewater treatment. In this regard a central          chamber filter presses are utilised for mechanical thick-
position is occupied by separation processes in which       ening and sludge dewatering. These filter devices are
suspended solids are taken out of the liquid phase.         tried-and-tested machines which have low operating
                                                            costs and achieve optimum separating outputs.
The effectiveness of these separation processes has a
significant influence on the respective amount of sludge
which is to be transported and disposed of. With this
in mind, Passavant-Geiger designs and manufactures
various systems and machines for sludge thickening
and dewatering.

                                                                                                         Passavant Geiger 3


                                            Thickener rods            Inlet cylinder

                           Scraper blades

                                                                              Sludge discharge

Top: Technical drawing           Bottom left: Assembly       Bottom right: Fence Thickener
of a thickener mechanism         of Picket                   being maintained
Products & Services

Static sludge Thickener
Static thickeners are often used as a pre-stage to further      Advantages of the Passavant Thickeners
mechanical sludge dewatering and, in industrial and             > Take-up of all horizontal and vertical forces in a stable,
municipal plants, they also take on an additional func-           walkable bridge structure.
tion as a hydraulic buffer. The suspended solids which          > Maintenance-free drive unit.
are to be separated settle in the thickener tank as a           > Dismantling of drive without tank drainage.
result of gravity. Doing so, they form a layer of sediments
across the whole bottom of the thickener tank. These            Passavant-Geiger provides thickeners for tanks with a
sediments need to be conveyed to a central outlet and           diameter of up to 50 m and sludge heights of up to 8 m
this task is carried out by thickeners.                         in various designs.

In addition to the scraper function, by means of the slow       Accessories for Passavant Thickeners
rotation speed, thickeners also have the task of forming        > Scum removal system
drainage channels in order to accelerate and improve the        > Lifting unit
compaction of the sediments. This effect is achieved by         > Inlet cylinder
additional thickener rods which reach from the compac-
tion up to the sedimentation zone.                              Fields of application for Passavant Thickeners
                                                                > Municipal and industrial clarification plants
Thickener mechanisms are designed as an overhead                   (pre-thickening and post-thickening)
bridge with central or radial drive. A torque control is pro-   > Steelworks (BOF sludge)
vided as overload protection and in special application         > Power plants (carbonate sludge)
cases, a function can be provided to hydraulically lift the     > Mineral industry (coal, oil sludge, sludge from
scraper blades. By means of the measured torque, the               concrete grinding)
thickening rate can be determined in order to automati-
cally control the sludge outlet.

                                                                                                              Passavant Geiger 5
Top: Baffle plates in   Bottom: Thickened sludge
the thickening zone     on belt thickener Passavant
Products & Services

Belt Thickener Passavant FluX-Drain
Belt thickeners are used to separate solids from sludge    Accessories for Passavant FluX-Drain
and suspensions on revolving and to a large degree         > Booster pumps for utilisation of the filtrate as washing
open filter belts by means of gravity filtration. These       water for the filter belt cleaning.
continuously running devices are designed for high-level   > Turbidity probe for measuring the thin sludge-dry
hydraulic flow rates for sludge with less than 1-2 % of      solid content in order to control the polymer dosing and
suspended solids. In most cases it is necessary to add       the belt speed.
polymers to achieve an optimal sludge thickening.          > Buffer tank and pump to feed the washing water back
                                                             into the sludge inflow.
Advantages of the Passavant FluX-Drain
> Gentle sludge feed which reduces the amount of           Fields of application for the Passavant FluX-Drain
  polymeric flocculants needed                             > Municipal and industrial clarification plants
> Rearrangement of the sludge structure by means              (excess sludge)
  of liftable baffles.                                     > Paper industry (fiber sludge)
> Belt speed of up to 40 m/min with working widths         > Drinking water treatment (return sludge)
  of up to 3 m for high-level hydraulic amounts of up
  to 180 m3/h.                                             Mobile plants are available for trials with regard to design
> Filter belt cleaning by means of spray nozzle system.    and as an interim solution during assembly periods.
> Separate discharge of filter belt washing water
  and sludge filtrate. Thus filtrate can be used for the
  filter belt cleaning which saves service water.
> Mechanical belt control up to 1.6 m belt width,
  over and above 1.6 m belt width control by means of
  pneumatically activated guide roller.
> Drive roller with thick rubber layer of up to 8 mm,
  guide roller coated with RILSAN® (polyamide).
> Thick sludge tank including level metering integrated
  in the chassis.

                                                                                                        Passavant Geiger 7
Top: Belt filter press   Bottom left: Detail      Bottom right: Cake
Passavant FluX-Press     of pre-dewatering zone   discharge
Products & Services

Belt Filter Press Passavant FluX-Press
Belt filter presses are continuous pressure filters with        Accessories for Passavant FluX-Press
revolving, endless filter belts. A light filter cake develops   > Booster pumps for utilisation of the filtrate as washing
in the straining zone due to gravity filtration. The filter       water for the filter belt cleaning.
cake is then compacted in the pressing zone via a second        > Turbidity probe for measuring the thin sludge-dry solid
filter belt. These presses are suitable for high dry-solid        content in order to control the polymer dosing and the
throughputs of statically or mechanically pre-thickened           belt speed.
sludge. Due to the open pores, polymeric flocculants            > Buffer tank and pump to feed the washing water back
generally have to be added.                                       into the sludge inflow.
                                                                > Equipment for optimal sludge conditioning.
When treating sludge with a low content of dry-solids,          > Peripheral equipment and components such as sludge
belt thickeners and belt filter presses can also be directly      pumps, conveyor belts, lime post conditioning, etc.
combined with each other.
                                                                Fields of application for the Passavant FluX-Press
Advantages of the Passavant FluX-Press                          > Municipal and industrial clarification plants
> Pneumatically or hydraulically stabilised belt tension,         (aerobic and anaerobic stabilised sludge)
  analogue belt control and separate drive unit for top         > Paper industry (fiber sludge)
  and bottom belt for low wear and tear of the belts.           > Mineral industry (flotation and soil sludge)
> Filter belt cleaning by means of spray nozzle system.         > Biogas plants (biological sludge)
> Separate discharge of filter belt washing water and
  sludge filtrate. Thus filtrate can be used for the filter     Mobile plants are available for trials with regard to design
  belt cleaning which saves service water.                      and as an interim solution during assembly periods.
> Drive roller with a rubber layer of up to 8 mm in thick-
  ness, guide roller coated with RILSAN® (polyamide).
> Belt widths 0.7 – 3 m.
> Gradually and continuously increasing compressive
  forces on the filter cake by use of press rollers with
  decreasing diameters. This ensures a high degree of
  dewatering with a minimum consumption of polymer.
> Especially profiled rollers in the pre-dewatering stage
  prevent the sludge from being remoistened.

                                                                                                             Passavant Geiger 9
Top: Chamber filter presses   Bottom left: Overhead   Bottom right: Opened
                              filter press            filtrate outlet
Products & Services

Chamber filter presses
Chamber filter presses are pressure filters which are        Passavant-Geiger provides filter presses with plate formats
operated discontinuously. The filtration area consists of    of 800 to 2450 mm and with extensive accessory equip-
filter plates which are arranged behind each other and       ment. Using the know-how from numerous references in
are hydraulically compressed in a frame. The filter plates   the industrial and wastewater sector, optimal techno-
are either attached to laterally fitted supports or to       logical and cost-effective solutions for filtration tasks are
overhead carriages. Accordingly, a distinction is drawn      designed and supplied.
between sidebar and overhead beam constructions.
                                                             Mobile pilot plants are also available. In this way the
Chamber filter presses have the advantage of being           dewatering characteristics of the sludge can be determined
technologically flexible and can therefore be optimally      and suitable technologies can be selected together with
adapted to the separation task in hand. For example,         the customer.
filtering surfaces within a range of 1 to 1000 m2 are
covered. With special filter plate packages (membrane        Fields of application for the Passavant chamber filter presses
filter presses) the filter cake can be additionally com-     > Municipal and industrial clarification plants (aerobic and
pacted, washed, receive an air flow through it and even        anaerobic stabilised sludge)
be thermally dried.                                          > Drinking water treatment (return sludge)
                                                             > Mineral industry (kaolin, chalk, coal)
Advantages of Passavant chamber filter presses               > Power plants (flue gas treatment, carbonate sludges)
> High separation efficiency and therefore marginal          > Steelworks (BOF sludge)
  loss of solids.                                            > Chemical industry (hydroxide, titanium dioxide, pigments)
> Very little residual moisture in the filter cake.          > Biogas plants (biological sludge)
> Various options for sludge conditioning in the area        > Sand, grit and soil conditioning
  of wastewater.                                             > Galvanic industry (phosphate sludge)
> Realisation of a high-pressure filtration for
  finest-grained suspensions.
> No moving parts in the sludge area and therefore
  low maintenance requirements.

                                                                                                           Passavant Geiger 11
Passavant-Geiger GmbH
Business Unit Passavant
Passavant-Roediger-Strasse 1
65326 Aarbergen, Germany
Phone: +49 6120 28 - 0
Telefax: +49 6120 28 - 2182

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