Self-Contained Unit

The Graver Monoplant packaged water treatment is pre-engineered with pre-treatment, chemical feed and filters designed to produce potable water. Seventeen standard sizes are available to treat from 20 gpm up to 500 gpm on a single plant.

Easy, economical to install

Installation time is minimal because the unit is shipped completely set up. The Monoplant incorporates within a single factory pre-fabricated steel tank, both clarification and filtration systems, thus minimizing to the greatest extent possible the field work to install the equipment. The unit can be unloaded and immediately placed upon its foundation. Field requirements include a small amount of wiring, setting the packaged chemical feeds, connecting inlet piping, chemical inter-connecting pipe and other utilities, and loading the filter media.

Guaranteed performance

When operated in accordance with the instructions furnished by Graver, the unit produces water with an effluent turbidity of less than 1 JTU. Turbidity is not greater than 10 JTU after the clarifier, and 1 JTU after the Monovalve filter.

Design Advantages:

• Clarifier rise rates and filtration rates are conservative (much below allowable limits) to insure good results.
• Media retaining Partilok strainers eliminate the costly placement of subfill and the possibility of bed upsets.
• The treatment unit includes a solid recirculation system and adequate retention time which are vital for treating highly coloured water.
• The Floc Barriers are inclined at 60 degrees from horizontal and do not have to be backflushed to remove solids.
• The filter system incorporates its own backwash storage compartment. Backwash is by gravity. No backwash pump, piping or controls required.
• Clarifier blowdown and filter backwash are separate cycles eliminating much water and chemical waste.
• The Monoplant does not require an effluent tailpipe to induce flow through the filter bed. Therefore maximum clearwell level can be up to the base of the Monoplant.
• Controls are simple, requiring a head gauge and pressure switch for each compartment, and cycle timers for sludge blowdown and backwash.

How the Monoplant packaged unit works:

Clarifier - The solids contact unit provides for flash mixing, sludge recirculation, flocculation, settling, clarification and sludge removal within a single basin. The unit is designed to recirculate sludge at a rate many times greater than the inlet flow. Mixing of raw water and injected chemicals with previously formed sludge particles is accomplished in a separate mixing zone.

Sludge recirculation - Effective solids recirculation is achieved by means of a variable speed drive impeller arrangement. This system lifts the previously formed sludge through the draft tube while simultaneously mixing it with the incoming water and the treatment chemicals. The water and sludge particles flow into the flocculation zone, where particle contact is induced. The flocculation zone is separated from the clarification zone by a baffle wall. Water and sludge particles descend toward the bottom of the unit where settling takes place with a portion entering the clarification zone while the remainder is recirculated. After the water enters the clarification zone, it rises, passes through the Floc Barrier section above which it is collected by a flume system with submerged orifices. The collector flume splitter divides the water equally between the filters.

Floc Barriers - The Floc Barrier consists of inclined, shallow two-inch square, 24" deep tube ducts formed from ABS plastic through which water flows upward to the collector flume. Floc particles in the water entering the modules rapidly settle to the bottom of the individual ducts where they come into contact with previously deposited particles. The Floc Barrier thus provides additional contact zones, facilitating the formation of denser, more readily settled particles. These agglomerated particles eventually reach the lower end of the Floc Barrier modules, from which they fall rapidly to the floor of the clarifier. The total effect of the floc barrier is to create a multiplicity of very shallow settling units, thus reducing the surface area and the retention time necessary to produce an excellent quality clarified water. The Floc Barrier is shipped separately for easy filed installation installation.

Monovalve filter - The automatic gravity filter consists of two filter compartments and a backwash water storage compartment. Backwash action is automatically initiated by head loss through the filter media. The filter automatically returns to service upon completion of the backwash. Filtered water, used for backwash, comes from the built-in storage compartment. The unit is capable of filtering at all flow rates up to design capacity. No rate-of-flow controllers are required. Operator attention is not necessary because operation is automatic and all flow and backwash rates are self-regulating. The filed work requirements will include interconnecting chemical feed piping and controls between the packaged chemical feeders, inter-connecting wiring for controls, connecting up the inlet water inlet water, control air and electricity to the unit, loading media and remounting parts removed for shipping clearance. Field work is thus reduced to a minimum. Internal wetted parts are cleaned and painted with epoxy suitable for potable water plants. The outside is also blast cleaned and epoxy coated.