Grigliatura

Si tratta di un processo essenziale finalizzato alla rimozione dei solidi grossolani presenti nel flusso delle acque. Offriamo una gamma completa di griglie meccaniche per la separazione dei solidi dalle acque reflue, caratterizzate da robustezza, facilità di manutenzione e alta efficienza operativa.

Applicazioni e modelli

Informazioni tecniche

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Applicazioni

Municipal wastewater and sewage screening Septic tank waste screening Industrial water and wastewater screening

	Screening opening	Channel width	Channel height
Coarse screening systems for channel	10-50 mm	500-2000 mm	1500-5000 mm
FINE screening systems for channel	3 & 6 mm	300-2000 mm	1500-5000 mm
FINE screening systems INSTALLED OUT OF CHANNEL	3 & 6 mm	300-2000 mm	1500-5000 mm

Coarse screening systems for channel

Modelli

EM32A

Mechanically moved rake with drive chains above water level

EM32A – VERTICAL SCREEN WITH CHAINS ABOVE WATER LEVEL

Application	Screening of municipal and industrial wastewater
Features	The machine consists of a fixed screen and a movable cleaning rake driven by chains positioned above water level.
Operation	Coarse solids are intercepted by the screen. The screened material is removed by the movable rake and discharged at the top, above water level. The rake is guided by two side carriages, driven by two drive chains.
Construction	Compact machine in galvanized or stainless steel. The chain and all moving parts are always kept above water level.
Installation	In a concrete channel.
Channel width	From 1000 to 2500 mm.
Filtration level	From 20 mm to 80 mm.
Advantages	Chains and moving parts kept above water level
Options	Load cell to measure the cleaning rake’s effort, with alarm and/or screen lock. Walkway and ladder to access the mechanical components located at the top.

OPERATING DESCRIPTION:

The machine is controlled by a pause-work timer. If the water level upstream of the screen rises above a set threshold, a level sensor can trigger the machine to restart even while in the Work Pause phase. The machine stops in pause mode only if the rake has reached a specific position above water level and after discharge has taken place. The machine is driven by a gearmotor that raises and lowers the rake. During the downward stroke, the cleaning rake stays open until it reaches the lowest position. When the cleaning rake reaches the bottom of the channel, the chain brings it close to the screen. During the upward stroke, the rake cleans the screen and retains the screened material inside it. Before the rake reaches the top position, a dedicated device cleans its inner part and discharges the screened material outside into a skip or onto a conveyor belt. At the top point, a limit switch controls the rake’s movement.

TECHNICAL AND DIMENSIONAL DATA REQUIRED FOR A QUOTATION

1.1	Design channel flow rate	:m³/h
1.2	Maximum channel flow rate	:m³/h
1.3	Maximum water level downstream of the screen	:mm.
1.4	Maximum water level upstream of the screen		:mm.
1.5	Channel width	:mm.
1.6	Channel height	:mm.
1.7	Discharge height from channel bottom	:mm.
1.8	Clear spacing between bars	:mm.

It is also necessary to specify the materials with which the machine will be built

EM32A KSA AlKumrah C3023

EM32H

Hydraulically moved rake with drive chains above water level

EM32H – VERTICAL SCREEN WITH HYDRAULIC DRIVE

Application	Screening of municipal and industrial wastewater
Features	The machine consists of a fixed screen and a cleaning rake driven by a hydraulic cylinder.
Operation	Coarse solids are intercepted by the screen. The screened material is removed by the movable rake and discharged at the top, above water level. The rake is guided by two carriages, driven by two drive chains. Engagement and disengagement of the rake with the screen is carried out by a hydraulic cylinder.
Construction	Compact machine in galvanized or stainless steel. The drive components are always kept above water level.
Installation	In a concrete channel.
Channel width	From 1000 to 3500 mm.
Filtration level	From 20 mm to 80 mm.
Advantages	Moving parts kept above water level, high penetration force of the rake into the fixed screen.
Options	Load cell to measure the cleaning rake’s effort, with alarm and/or screen lock. Walkway and ladder to access the mechanical components located at the top.

OPERATING DESCRIPTION:

The machine is controlled by a pause-work timer. If the water level upstream of the screen rises above a set threshold, a level sensor can trigger the screen to restart even while in the Work Pause phase. The screen stops in pause mode only if the rake has reached a specific position above water level and after discharge has taken place. The machine is driven by 1 gearmotor for raising and lowering the rake, and by a hydraulic cylinder controlled by a power unit for engaging and disengaging the rake from the screen. During the downward stroke of the carriages, the cleaning rake stays open until it reaches the lowest position. When the cleaning rake reaches the bottom of the channel, a limit switch stops the descent. The hydraulic piston engages the rake with the screen and, via a signal, the gearmotor restarts, lifting the rake — now engaged with the screen — up to the discharge point. The piston is fitted with two internal proximity sensors that allow full opening or closing. During the upward stroke, the rake cleans the screen and retains the screened material inside it. Before it reaches the top position, a dedicated device cleans the inner part of the rake and discharges the screened material into a skip or onto a conveyor belt. At the top point, a limit switch stops the motor driving the screen’s lift and reverses its motion, starting the downward stroke. Meanwhile, the hydraulic cylinder moves the cleaning rake away from the screen.

TECHNICAL AND DIMENSIONAL DATA REQUIRED FOR A QUOTATION

1.1	Design channel flow rate	:m³/h
1.2	Maximum channel flow rate	:m³/h
1.3	Maximum water level downstream of the screen	:mm.
1.4	Maximum water level upstream of the screen	:mm.
1.5	Channel width	:mm.
1.6	Channel height	:mm.
1.7	Discharge height from channel bottom	:mm.
1.8	Clear spacing between bars	:mm.

It is also necessary to specify the materials with which the machine will be built

EM32H 11partic
EM32H 6partic
EM32H 7
EM32H 9partic
EM32H C04800-1
EM32H Pettine

EM32C

Mechanically moved rake with submerged drive chains

EM32C – VERTICAL SCREEN WITH SUBMERGED CHAINS

Application	Screening of municipal and industrial wastewater
Features	The machine consists of a fixed screen and one or more cleaning rakes driven by chains
Operation	Coarse solids are intercepted by the screen. The screened material is removed by one or more cleaning rakes driven by a pair of chains partially submerged in the fluid being screened.
Construction	Compact machine in galvanized or stainless steel. The chain is always in stainless steel.
Installation	In a concrete channel.
Channel width	From 500 to 1500 mm.
Filtration level	From 10 to 80 mm.
Advantages	Low cost, possibility of using multiple cleaning rakes.
Disadvantages	Difficulty removing solids larger than 300 mm.
Options	Load cell to measure the cleaning rake’s effort, with alarm and/or screen lock.

OPERATING DESCRIPTION

TECHNICAL AND DIMENSIONAL DATA REQUIRED FOR A QUOTATION

1.1	Design channel flow rate	:m³/h
1.2	Maximum channel flow rate	:m³/h
1.3	Maximum water level downstream of the screen	:mm.
1.4	Maximum water level upstream of the screen	:mm.
1.5	Channel width	:mm.
1.6	Channel height	:mm.
1.7	Discharge height from channel bottom	:mm.
1.8	Clear spacing between bars	:mm.

It is also necessary to specify the materials with which the machine will be built

EM32C C5455
EM32C Italy Avezzano C5286
EM32C Kuwait Napoli C5279

EM32OL

Fully hydraulically operated screen

EM32D

Mechanically operated rake with cable lifting system

EM32D – VERTICAL SCREEN WITH CABLE LIFTING SYSTEM

Application	Screening of municipal and industrial wastewater
Features	The machine consists of a fixed screen and a grab bucket driven by two control units, one for vertical movement and the other for opening and closing the bucket.
Operation	Coarse solids are intercepted by the screen. The screened material is removed by the movable grab bucket and discharged at the top, above water level. The bucket is guided by two carriages, moved by two cable systems (one for vertical movement and the other for opening and closing).
Construction	Compact machine in galvanized or stainless steel. The drive components are always kept above water level
Installation	In a concrete channel.
Channel width	From 1000 to 3000 mm.
Filtration level	From 15 to 100 mm.
Advantages	Suitable for very deep channels, with sand present on the bottom and large-sized solids.
Disadvantages	Not suitable for small channels.
Options	Load cell to measure the cleaning rake’s effort, with alarm and/or screen lock. Walkway and ladder to access the mechanical components located at the top.

OPERATING DESCRIPTION:

The machine is controlled by a pause-work timer. If the water level upstream of the screen rises above a set threshold, a level sensor can trigger the screen to restart even while in the pause phase. The machine stops in pause mode only if the bucket has reached a specific position above water level and after discharge has taken place. The machine is driven by 2 gearmotors: one drives the lifting of the cleaning rake, and the other drives the unit that engages and disengages the rake from the screen. At the top of the control unit there are 3 drums: 2 side drums and 1 central drum. The drums are driven by a gearmotor and wind/unwind the cables that raise and lower the cleaning rake. The second gearmotor drives a pulley that winds and unwinds the central cable, causing the bucket to move toward and away from the screen. During the downward stroke of the carriage, the bucket stays open until it reaches the lowest position. When the bucket rests on the bottom, the hoist cable slackens and a limit switch (connected to the cable tension) stops the gearmotor. The rotation direction of the 1st gearmotor is reversed, and the second gearmotor is activated, winding in the central cable so that the bucket engages with the screen. The upward stroke then takes place, during which the bucket cleans the screen and retains the screenings inside it. Before the bucket reaches the top position, a dedicated device cleans its inner part and discharges the material into a skip or onto a conveyor belt. At the top point, a limit switch stops the motor driving the screen’s lift and reverses its motion, starting the downward stroke. Meanwhile, the 2nd gearmotor drives the central drum, moving the cleaning rake away from the screen. The downward stroke takes place with the bucket kept clear of the screen.

TECHNICAL AND DIMENSIONAL DATA REQUIRED FOR A QUOTATION

1.1	Design channel flow rate	:m³/h
1.2	Maximum channel flow rate	:m³/h
1.3	Maximum water level downstream of the screen	:mm.
1.4	Maximum water level upstream of the screen	:mm.
1.5	Channel width	:mm.
1.6	Channel height	:mm.
1.7	Discharge height from channel bottom	:mm.
1.8	Clear spacing between bars	:mm.

It is also necessary to specify the materials with which the machine will be built

EM32D 000-R0
EM32D C04487-Tunisia
EM32D Lehavim1
EM32D
EM32D Tunisia Ghedir C5439-1
EM32D Tunisia Ghedir C5439-2
EM32D Tunisia Ghedir C5439

FINE screening systems for channel

Modelli

EM31G

Continuous belt screen with self-cleaning plastic teeth

EM31G – CONTINUOUS BELT VERTICAL SCREEN

Application	Screening of municipal and industrial wastewater
Features	The machine consists of a filtering belt with teeth and wheels in acetal resin and stainless steel shafts, and is equipped with a cleaning brush and a washing system.
Operation	Water containing suspended particles passes through the filtering belt, depositing suspended solids on it. The screened material is lifted and removed with the help of a rotating brush and a washing system.
Construction	Compact machine in stainless steel.
Installation	In a concrete channel.
Channel width	From 300 to 2000 mm.
Filtration level	3 or 6 mm.
Advantages	Continuous filtration, also suitable for water containing fibrous material.
Disadvantages	Difficulty removing solids larger than 250 mm.
Options	Slip coupling with alarm sensor. Double motorized cleaning brush.

OPERATING DESCRIPTION

The machine is controlled by a pause-work timer. If the water level upstream of the screen rises above a set threshold, a level sensor can trigger the machine to restart even while in the Work Pause phase. The filtering belt continuously lifts the retained solids, and at the top the screened material is tipped and discharged, aided by the reciprocal movement of the teeth, a rotating brush, and two washing ramps that further remove the screened material.

CONSTRUCTION DETAILS

Wheels

To prevent wear on the tooth-carrying shafts, this machine is fitted with protective bushings mounted at the ends of the shafts, on which the wheels rotate. The wheels are made of plastic material, mass-produced, low-cost, and easily replaceable.

Guides

The guides are bolted to the frame and easily replaceable.

TECHNICAL AND DIMENSIONAL DATA REQUIRED FOR A QUOTATION

1.1	Design channel flow rate	:m³/h
1.2	Maximum channel flow rate	:m³/h
1.3	Maximum water level downstream of the screen	:mm.
1.4	Maximum water level upstream of the screen	:mm.
1.5	Channel width	:mm.
1.6	Channel height	:mm.
1.7	Discharge height from channel bottom	:mm.
1.8	Clear spacing between bars	:mm.

The materials used are stainless steel for the frame and shafts, and acetal resin for the filtering teeth and wheels.

EM31G 200
EM31G Ovada4
EM31G Ovada5
EM31G Rondella2
EM31G Tipico

EM31C

Inclined fixed-basket screen with transport screw conveyor and compactor

EM31C – INCLINED FIXED-BASKET SCREEN WITH COMPACTOR

Application	Screening of municipal and industrial wastewater.
Features	The machine consists of a basket with trapezoidal bars, a compacting screw conveyor, and washing ramps.
Operation	Water containing suspended particles passes through the filtering basket, depositing the suspended solids on it. The screened material is discharged into a lifting and compacting screw conveyor. The screenings are removed and washed by 3 washing ramps.
Construction	Compact machine in stainless steel.
Installation	In a concrete channel
Channel width	From 600 to 2000 mm.
Filtration level	From 0.25 to 6 mm.
Advantages	Continuous filtration, also suitable for water containing fibrous material.
Disadvantages	Difficulty removing solids larger than 250 mm.

OPERATING DESCRIPTION

The machine is controlled by a pause-work timer. If the water level upstream of the screen rises above a set threshold, a level sensor can trigger the machine to restart even while in the Work Pause phase. The water to be treated is filtered by the fixed screen; the retained solids are lifted, compacted, and discharged by a screw conveyor. During lifting, the screened material undergoes washing in order to remove soluble organic substances.

TECHNICAL AND DIMENSIONAL DATA REQUIRED FOR A QUOTATION

1.1	Design channel flow rate	:m³/h
1.2	Maximum channel flow rate	:m³/h
1.3	Maximum water level downstream of the screen	:mm.
1.4	Maximum water level upstream of the screen	:mm.
1.5	Channel width	:mm.
1.6	Channel height	:mm.
1.7	Discharge height from channel bottom	:mm.
1.8	Clear spacing between bars	:mm.

The screen is made of stainless steel with a high-strength steel screw conveyor, optionally fully in stainless steel

EM31C BarreCurve

FINE screening systems INSTALLED OUT OF CHANNEL

Modelli

EM79

Rotary drum screen

EM79 – ROTOSTRAINER

Application	Screening of municipal and industrial wastewater.
Features	The machine consists of a rotating drum
Operation	Coarse solids are intercepted on the outside of the drum. The screened material is removed by a scraper blade, and the drum is cleaned by a washing ramp positioned inside the drum
Construction	Compact machine in stainless steel.
Installation	Free-standing
Drum diameter	628 or 920 mm
Drum length	From 500 to 3000 mm
Filtration level	From 0.25 to 3 mm.
Disadvantages	Cleaning brush

OPERATING DESCRIPTION

The machine is controlled by a pause-work timer. If the water level in the feed tank rises above a set threshold, a level sensor can trigger the machine to restart even while in the Work Pause phase. The water to be treated enters the feed compartment and is distributed over the entire surface of the drum. Filtration occurs from the outside toward the inside of the drum. The water that has entered the drum flows out from the inside toward the outside of the drum. In this way, the screening drum is kept continuously self-cleaning. The solids screened on the outer surface of the drum are removed by a scraper blade and, optionally, with the help of a motorized brush. Feed can be by gravity or by pump

TECHNICAL AND DIMENSIONAL DATA

Flow rate table (m³/h) with SST = 200 ppm

Model	0.25	0.5	0.75	1.0	1.25	1.5	2	2.5	3
EM79-6005	45	80	105	125	140	155	180	195	210
EM79-6006	55	95	125	150	170	190	210	235	250
EM79-6007	65	110	150	180	200	220	250	280	300
EM79-6008	75	125	170	205	230	255	290	320	340
EM79-6010	90	160	215	260	290	320	370	405	430
EM79-6015	135	240	325	395	450	490	555	610	650
EM79-6020	180	300	435	530	590	650	750	820	870
EM79-9030	435	740	980	1250	1450	1650	1850	2150	2350

EM100G

"Ultrascreen" belt filtering system

EM100G – ULTRASCREEN

Application	Screening of municipal and industrial wastewater.
Features	The machine consists of a continuous-loop filtering belt
Operation	Coarse solids are intercepted by the belt and discharged into an external container. The belt is brushed and washed with water
Construction	Compact machine in stainless steel.
Installation	Free-standing
Belt width	1200 – 2100 – 3000 mm
Filtration level	From 150 microns to 2 mm.
Advantages	Suitable for filtering water containing solids with grease, fibrous material, and substances that tend to clog conventional rotary drum screens
Options	High-pressure washing

OPERATING DESCRIPTION

The machine is controlled by a pause-work timer. Depending on the application, the machine can be started by a water level sensor in the feed tank, or by a flow sensor in the feed or drain pipe. The water to be treated enters the feed compartment and is distributed over the entire surface of the belt. Filtration takes place by gravity; the solids are retained by the belt and are then removed by a system of motorized rotating brushes. After discharge, the belt is continuously washed by a high-pressure water washing system. In this way the belt is kept continuously self-cleaning. Feed can be by gravity or by pump

TECHNICAL AND DIMENSIONAL DATA REQUIRED FOR A QUOTATION

1.1	Filter feed flow rate	: m³/hr
1.1	Inlet suspended solids	: p.p.m.
1.2	Minimum size of solids to be separated	: micron
1.3	Applicable model	: EM	100/1200	100/2100	100/3000
1.4	Belt width	: mm	1200	2100	3000
1.5	Filtering belt speed	: mt/min.	1.6-8.5	1.6-8.5	1.6-8.5
1.6	Maximum mesh opening	: micron
Utilities required
Belt washing water
1.7	flow rate	: m3/hr	1.2	2	3
1.8	head	: Bar	20	20	20
Compressed air
1.9	flow rate	: lt/min.	250	250	250
1.10	pressure	: Bar	7	7	7
Electrical loads
1.11	Belt drive	: Kw	0.55	0.75	1.5
1.12	Cleaning brush	: Kw	0.37	0.37	0.37
1.13	High-pressure water pump	: Kw	4	5.5	7.5
1.14	Air compressor	: Kw	2.2	2.2	2.2
1.15	Submersible pump for washing water return	: Kw	0.55	0.75	1.1

Accessories

Modelli

EM49

Screw conveyor

EM49 – SCREW CONVEYOR

Application	Transport of dewatered sludge or screened material.
Features	The machine consists of a screw conveyor rotating inside a trough.
Construction	Galvanized or stainless steel.
Models	EM49 A1 Flat screw conveyor with shaft EM49 A2 Fixed inclined screw conveyor with shaft EM49 A3 Slewing inclined screw conveyor with shaft EM49 A4 Flat D/S screw conveyor with shaft EM49 B1 Flat shaftless screw conveyor EM49 B2 Fixed inclined shaftless screw conveyor EM49 B3 Slewing inclined shaftless screw conveyor EM49 B4 Flat D/S shaftless screw conveyor

To quote a screw conveyor, the following information is needed

1.1	Length	: m
1.2	Screw diameter	: mm	500
1.3	Loading height	: m
1.4	Discharge height	: m
1.5	Flow rate to be conveyed	: kg/h

EM62

Belt conveyor

EM62 – BELT CONVEYORS

Application	Transport of dewatered sludge or screened material.
Features	The machine consists of a moving belt that conveys the solids.
Construction	Galvanized or stainless steel.
Models	EM62 A Flat EM62 B Fixed inclined EM 62 C Slewing inclined EM 62 D Gooseneck
Safety devices	Emergency pull-cord switch positioned along the edges of the belt conveyor.

To quote a belt conveyor, the following information is needed

1.1	Length	: m
1.2	Belt width	: mm	500
1.3	Loading height	: m
1.4	Discharge height	: m
1.5	Flow rate to be conveyed	: kg/h

EM56

Screw compactor

EM56F – SCREW COMPACTOR

Application	Transport and compaction of screened material
Features	The machine consists of a screw conveyor and a compaction unit
Operation	The screened material is conveyed by the screw into the compaction unit; the separated water returns to the channel
Construction	Compact machine in stainless steel.
Installation	Out of channel
Trough diameter	200 mm
Screw length	Variable

OPERATING DESCRIPTION

The screened material is conveyed by the screw into the compaction zone, which is equipped with a draining basket and intermittent washing, where it is compacted and discharged. The drained water returns to the discharge channel.

TECHNICAL AND DIMENSIONAL DATA

1.1	Trough width	: mm.	225
1.2	Screw outer diameter	: mm.	180
1.3	Screw inner diameter	: mm.	105
1.4	Flow rate	: m3/h	2
1.5	Inclination	: °	5°
1.6	Screw speed	: r.p.m.	28
1.7	Screenings discharge height	: mm.
1.8	Screw length	: mm.
1.9	Overall length	: mm.
1.10	Washing water	: m³/h	1-2
1.11	Installed power	: Kw.	1.5
1.12	Power supply voltage	: V-ph-Hz	380-3-50
1.13	Motor protection	: IP	55

The material normally used for construction is stainless steel.

EM86

Compattatore oleodinamico

EM86 – HYDRAULIC PISTON COMPACTOR

Application	Transport and compaction of screened material
Features	The machine consists of a loading chamber with piston, a compaction and discharge pipe, and a hydraulic power unit
Operation	The screened material is collected in the cylinder; the piston moves back and forth, and during the forward stroke it compacts the screened material into the discharge pipe.
Construction	Compact machine in stainless steel.
Installation	Out of channel
Piston diameter	250 mm or 350 mm

TECHNICAL AND DIMENSIONAL DATA REQUIRED FOR A QUOTATION

1.1	Conveying press:
1.1.1	Flow rate	: m³/h.	1.8	2.7
1.1.2	Cylinder diameter	: mm.	250	350
1.1.3	Maximum specific pressure	: kg/cm²	15	10
1.1.4	Feed inlet dimensions	: mm.	500×350	600×450
1.1.5	Compacted material outlet flange	: DN	250	350
1.1.6	Separated water drain flange	: “	2	2
1.1.7	Construction material	: AISI	304	304
1.2	Hydraulic power unit:
1.2.1	Installed power	: kW	4	5.5
1.2.2	Pump flow rate	: l/min	8	10
1.2.3	Oil tank capacity	: l	60	60
1.2.4	Maximum working pressure	: BAR	200	200
1.3	Hydraulic cylinder:
1.3.1	Bore	:mm	80	100
1.3.2	Stroke	:mm	700	700
1.3.3	Rod diameter	:mm	40	60
1.3.4	Force at 200 bar	: kg.	7,400	9,700

CALCOLO DELLE PERDITE DI CARICO

Rientrano fra i fenomeni di efflusso rigurgitato anche quelli di attraversamento delle griglie, formate da barre allungate nella direzione della corrente. Le barre possono essere di varia sezione e inclinate di un diverso angolo (α) sul piano orizzontale (Fig. FG1). La perdita di carico attraverso una griglia viene determinata utilizzando la formula di KIRSHMER: dove: – v : velocità dell’acqua in assenza della griglia; – α: angolo di inclinazione della griglia rispetto all’orizzontale; – d : spessore delle barre; – a: luce libera tra le barre; – β: coeff. di forma funzione della sezione della barra, come indicato in figura. In sostanza, il valore: rappresenta una perdita di carico che provoca un “rigurgito” a monte o a valle della griglia, a secondo che si tratti di corrente lenta o veloce.

Il risultato vale per griglia pulita; per griglia intasata la perdita di carico aumenta notevolmente.

Valori indicativi delle perdite di carico attraverso griglie di diversa luce libera di passaggio con inclinazione di 60°

EM31C BarreCurve

EM31G 200

EM31G Ovada4

EM31G Ovada5

EM31G100 Dégrilleur

EM31G100 Messico

EM31G Rondella2

EM31G Tipico

EM32A KSA AlKumrah C3023

EM32C C5455

EM32C Italy Avezzano C5286

EM32C Kuwait Napoli C5279

EM32D 000-R0

EM32D C04487-Tunisia

EM32D Lehavim1

EM32D

EM32D1

EM32D Tunisia Ghedir C5439-1

EM32D Tunisia Ghedir C5439-2

EM32D Tunisia Ghedir C5439

EM32H 11partic

EM32H 6partic

EM32H 7

EM32H 9partic

EM32H C04800-1

EM32H Pettine

em31c

em31g acea-1

em32h 4