Advanced Combined Sewage Pre-treatment Unit | Multi-Stage Screening & Grit Removal System

Advanced Combined Sewage Pre-treatment Unit | Multi-Stage Screening & Grit Removal System

Product Item : DSP-30
Category： combined wastewater pre-treatment unit
Application: Municipal Sewage, Stormwater Runoff, Combined Sewer Systems
Process: Coarse Screening, Fine Screening, Grit Removal, Compaction
Capacity Range: Up to 50,000 PE (Population Equivalent)
Key Feature: All-in-One Design, Reduced Clogging, Automatic Operation
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Compact Units Pretreatment Plants For Wastewater Treatment Description

The Combined Pre-Treatment Plant is a complete, above-ground headworks requiring minimal space and civil works. Debris, grit/sand and grease can all be removed in this one compact system. For small plants, this system can function as an entire pre-treatment headworks or it can be a simple, economical way to increase pre-treatment capacity.

With the addition of aeration and DAGYEE’s proprietary grease removal system, this unit can become a Septage, Sludge and FOG processing station. Depending on preference or application, a variety of screen types can be incorporated into the compact plant. With over 10 years of experience and 500 installations worldwide, DAGYEE’s application and technical knowledge insures proper sizing and component selection for each specific application.

Combined Screening Component

Dependable, complete and compact unit Performing the following process steps:

fine screening
Screenings dewatering
Grit separation
Grit dewatering
Grease separation and removal (optional)

Combined Screening Working Principle

It is a combined unit used to pre-treat wastewater before it enters the waste water treatment plant. It performs three operations: screening; grit removing and grease removing. Wastewater passes through the screen, where bigger particles are removed: the screw screen also washes and compacts the screenings before discharge. The efficiency depends on the screen perforation, as well as the capture rate. Inlet screen can be a spiral screen TSS or SSS type; a rotary drum screen TR type, and the screen tank can be provided with a by-pass tank with manual screen inside. the screen basket or the screen drum can be made of perforated plate or wedge wire. After the screening section, the wastewater flows toward the settling tank, where the grit sedimentation takes place. In order to improve this process a special baffle is used to obtain a laminar flow as well as to reduce the temperature gap. Settled grit is collected toward the accumulation pit and then removed by an inclined screw conveyor (grit classifier). This can eventually be provided with a washing system. Suspended particles, such as oil, grease and other matters, are removed by stainless steel wire driven paddles system. The settling tank is provided with an air blower to increase the organic matter separation and grit settlement. Bigger units can be provided with two blowers. The unit can be manufactured in stainless steel grade 304 or 316, with spiral in carbon steel or stainless steel and/or many combination of the two materials. In those case where the grease removing system is not required, the unit is not provided with the paddle and is named CBU2. Different combinations of treatments can be provided: the unit can performs the following solutions: • Screening, grit, grease removing • Screening and grit removing • Grit removing • Grease and grit (no screening) Upon request the unit can be supplied provided with a control panel, which can be electromechanical or PLC controlled.

The wastewater firstly enters the tank where a screw screen is placed.

Big size solid materials are filtrated by the screw screen and a screw conveyor moves the solid materials captured up to the discharge point. At the end of the conveyor, they are pressed by the compaction unit before discharge.

The water which has still solid materials in smaller sizes flows through the sedimentation tank. The particles are settled by time and a horizontal screwconveyor transports them to the collection hopper.

Finally, they are conveyed by the grit removal screw conveyor to the discharge point.

Combined Screening Parameter

Power Specifications
Model	Capacity (m3/h)	Tank Length（mm）	Tank Width（mm）	Inlet Flange DN	Outlet Flange DN	Max.Wash Water(L/S)
DSP-30	30	4200	1200	DN200	DN200	0.5
DSP-50	50	5800	1200	DN200	DN200	0.5
DSP-100	100	7000	1200	DN250	DN250	1
DSP-150	150	7000	1200	DN250	DN250	1
DSP-200	200	8000	1500	DN300	DN300	1
DSP-250	250	8500	1500	DN350	DN350	1
DSP-350	350	10000	1500	DN400	DN400	1
DSP-400	400	12000	1800	DN500	DN500	1
DSP-500	500	15000	2000	DN500	DN500	1

Power Specifications
Model	Screw Screen Power(kw)	Screw Conveyor Power(kw)	Grit Removal Power(kw)	Grease Removal Power(kw)
DSP-30	0.55	0.25	0.37	0.18
DSP-50	0.55	0.35	0.37	0.18
DSP-100	0.75	0.37	0.55	0.18
DSP-150	0.75	0.37	0.55	0.18
DSP-200	0.75	0.55	0.75	0.18
DSP-250	1.1	0.55	0.75	0.18
DSP-350	1.1	0.55	0.75	0.18
DSP-400	1.1	0.55	0.75	0.18
DSP-500	1.1	0.55	1..1	0.18

Combined Screening Features

Bar screen, sand extraction and separation / grit in addition to the separation of oily substances. These compact or combined units can be installed on concrete bases, mobile and transportable.