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First Rainwater Treatment Systems and Tanks

"Discontinuous" First Rainwater System, Storage and Delivery with Electric Pump to the Oil Separator

Storage Volume Dimensions AMPP Tank (5 mm Draining Waterproof Area)
UNI EN 858-1 compliant, I class separator with coalescence filter

First Rainwater Treatment Systems and Tanks

Introduction

Managing first rainfall is one of the main objectives to protect ground water. Specifically, these systems are designed to temporarily store (in precast tanks) first rainwater, with a timer-controlled and delayed delivery (about 48 hours) after rain stop through an electric lifter pump for the following treatment (static oil separator with coalescence filter).
The use of these system aims at reducing surface water pollution and mitigate flood peaks caused by heavy rain (rain bombs).

Features and operating principle

First rainwater coming from the sewage collecting all water from roads, car parks (transit areas), is channeled into storage tanks via a spillway or bypass, and this system separates first rainwater - "potentially polluted waters identified in the first 5 mm" - from second rainfall, supposed to be clean and not contaminated, therefore ready to be channeled into the outlet.
First rainwater is temporarily collected in precast reinforced concrete tanks where sand and sludge sedimentation takes place, first and second rainwater separation is ensured by a stainless steel floater anti-backflow valve mounted on the storage tank inlet and then (usually after 48-72-96 hours) they are sent through to an oil separation treatment for light fluids (discharge table 3) thanks to a submerged electric pump with constant flow rate, or, alternatively, to the final collector.
Sometimes, if the limits required by the operator are particularly strict (discharge table 4), it is necessary to thoroughly treat water, and therefore quartzite and/or activated carbon filters are installed.
After the treatment, it is necessary to always have a sampling pit with suitable dimensions to take samples.
The competent body for final receptor management (public sewers) can require the installation of a flow meter to quantify discharged first rainwater.

Accessories suggested to control pollutants

SET\DM3DL Digital Conductivity Probe

The oil interface probe SET\DM3DL is installed in the collection compartment for light slurry at a pre-set height.
The probe triggers the warning system if its upper part section is reached by oil or hydrocarbons. The probe is usually submerged when operating.

SET\S2 Digital Ultrasound Probe

The sludge warning probe SET\S2 is installed in the lower portion of the separator. The probe activates the warning system is the sand or sludge layer reaches it. The probe is usually submerged when operating.

SET1V Digital Vibration Probe

The SET\V limit threshold probe is installed over the highest tank level. The probe triggers the warning system if reached by fluids (water, oil, other). The probe is usually hanging when operating, with no contact with fluids.

Supply Specifications

Delivery and installation of First Rainwater System manufactured in DECLARED SERIES Mod. RAIN____ system with storage of the first 5 mm rain and delivery to the external oil separator, surface _____ sqm, effective volume ____ cubic meters, DN pipe cross-section ______, external oil separator NS flow rate ____ lt/sec suitable for treatment system, composed of underground precast tanks manufactured by EDIL IMPIANTI 2 S.r.l. with UNI EN ISO 9001 and ISO 45001 management system made of monoblock vibrated concrete, reinforced with stainless steel vertical pillars and horizontal beams, with CE-certified materials, concrete in compressive strength class C45/55 (RCK >55 N/mm²), internal improved-adhesion steel reinforcements checked in our plant, GREESMIX5® steel fibers (patent No. 0001421398 issued by the Ministry for Economic Development) and electro-welded square mesh B450C, with certification of CHEMICAL RESISTANCE and REACTION TO FIRE (Class A1) issued by an external body based on UNI EN standards.

The First Rainwater System Mod. RAIN_____ The system with 5mm first rainfall storage and delivery to the external oil separator must include:
- External spillway, dimensions ______ x ____ x ____ cm height, with inlets, bypass, and outlets to First Rainwater Tank;
- Precast First Rainwater Tank/Tanks for sedimentation and storage in monoblock vibrated reinforced concrete. External dimensions _____ x _____ x_____ h cm for an effective total volume of ____ cubic meters, with inlet and inner inlet AISI 304 stainless steel shutter valves, vibrated reinforced concrete partition wall to protect the electric pump/s, outlet for pump/s delivery, First Rainwater package with 1/2 electric pump/s, rain sensor, switchboard and optical-acoustic warning.
- Static oil separator Mod. DISCE _______-FC CE-marked and UNI EN 858-1 compliant, NS flow rate ____ lt/sec, external dimensions _____ x ____ x ____ h cm, with inlets/outlets, inlet coupling connection with elastomeric rubber gasket and calm AISI 304 stainless steel baffle, removable and washable refill coalescence filter with AISI 304 stainless steel frame, automatic floating shutter entirely made of AISI 304 stainless steel.
All tank external walls must be waterproofed with suitable coating materials.

First Rainwater System Dimensions

Data Sheet Download


Select Article Code to access the Data Sheet for the product.

Article Code

Article
Code
Surface
(mq)
Usable
Volume F.R.
(mc)
Pipes
Diam.
(mm)

Spillway
Code
External Dimensions
First Rainwater System (cm)
First
Rainwater System
Weight (ql)
Cover slab
First Rainwater System
weight (ql)
Static Oil
Separator

Code
Width Length Height h. 15 cm C250 h. 20 cm D400
RAIN01 300 1,5 125 SCOLM0 125 180 150 24,6 8,4 11,2 DISCE2C-FC
RAIN03 600 3,0 160 SCOLM0 175 180 150 29,9 11,7 15,6 DISCE2C-FC
RAIN04 800 4,0 160 SCOLM0 180 240 150 47,1 16,1 21,5 DISCE2C-FC
RAIN05 1.000 5,0 160 SCOLM1 180 300 150 55,7 20,1 26,8 DISCE2C-FC
 
RAIN31 1.500 7,5 160 SCOLM1 246 220 200 68,4 20,2 26,9 DISCE2C-FC
RAIN32 1.800 9,0 160 SCOLM1 246 270 200 78,3 24,7 33,0 DISCE2C-FC
RAIN33 2.250 11,3 200 SCOLM1 246 320 200 88,2 29,3 39,1 DISCE2C-FC
 
RAIN114 2.800 14,0 200 SCOLM2 246 320 250 102,5 29,3 39,1 DISCE3C-FC
RAIN115 3.000 15,0 200 SCOLM2 246 370 250 113,7 33,9 45,2 DISCE3C-FC
RAIN116 3.500 17,5 200 SCOLM2 246 420 250 124,9 38,5 51,3 DISCE3C-FC
RAIN117 4.000 20,0 200 SCOLM2 246 470 250 141,5 43,1 57,4 DISCE4-8C-FC
RAIN118 4.500 22,5 200 SCOLM2 246 520 250 152,7 47,7 63,6 DISCE4-8C-FC
RAIN119 5.000 25,0 200 SCOLM3 246 570 250 163,9 52,2 69,7 DISCE4-8C-FC
RAIN120 5.500 27,5 200 SCOLM3 246 620 250 175,1 56,8 * 75,8 * DISCE4-8C-FC
RAIN121 6.000 30,0 200 SCOLM3 246 670 250 186,2 61,4 * 81,9 * DISCE4-8C-FC
RAIN122 6.500 32,5 200 SCOLM3 246 720 250 202,8 66,0 * 88,0 * DISCE4-8C-FC
RAIN123 7.000 35,0 200 SCOLM3 246 770 250 214,0 70,6 * 94,1 * DISCE4-8C-FC
RAIN124 7.500 37,5 200 SCOLM4 246 820 250 225,2 75,2 * 100,2 * DISCE4-8C-FC
RAIN125 8.000 40,0 200 SCOLM4 246 870 250 236,4 79,7 * 106,3 * DISCE4-8C-FC
RAIN126 8.500 42,5 200 SCOLM4 246 920 250 247,6 84,3 * 112,4 * DISCE4-8C-FC
RAIN127 9.000 45,0 200 SCOLM4 246 970 250 264,2 88,9 * 118,5 * DISCE4-8C-FC
RAIN128 9.500 47,5 200 SCOLM4 246 1020 250 275,3 93,5 * 124,7 * DISCE4-8C-FC
RAIN129 10.000 50,0 200 SCOLM4 246 1070 250 286,5 98,1 * 130,8 * DISCE4-8C-FC


* Cover Slab divided into two parts - The data reported is purely indicative
It is possible to have extensions (bottomless tanks) for all of our products

For Dimensioning with bigger volumes other than those reported in the table, please contact our Technical Department.

Emilia-Romagna First Rainwater Systems

First Rainwater Systems Emilia-Romagna Region

Calculation taken from the ARPS LG28/DT Guidelines
Discontinuous storage tank system for light fluid lifting and separation
DGR 286/05 and 1860/06 implementation criteria "METEORIC STORM WATER"
Oil Separator with I Class and II Class Refill Coalescence Filter

Dimensions

The current regional regulation (Regional Resolution of 18th Dec. 2006, No. 1860 "Guidelines for meteoric storm water and first rainwater management as implementation of the R.C. Resolution No. 286 of 14/02/2005") defines storms as "one or more rainfalls, also distant in terms of time, for a total 5 mm height, taking place at least 72 hours after a previous similar event" and, more specifically, defines first rainwater resulting from uncovered waterproof surfaces with relation to the activities carried out herein or according to the purpose, completed within the time necessary to assess first rainwater (5 mm). First rainwater treatment systems are designed based on their surface in compliance with the REGIONAL OR NATIONAL TECHNICAL REGULATIONS in compliance with the EUROPEAN DIRECTIVES and are composed of the following treatment stages: DEGRITTING, OIL SEPARATION WITH COALESCENCE FILTERS, LAMELLAR PACKAGES AND FURTHER FINISHING WITH ACTIVATED CARBON FILTERS. For first and second rainwater treatment, automatic cleaning systems can be installed in degritters during the sand sedimentation stage. Meteoric water treatment systems are also installed to enhance disposal, thus being beneficial for ground water avoiding floods in surface ditches, sewage overload during heavy rain and malfunctions for urban purification plants.
Emilia-Romagna regulations D.G.R. 1860/2006 for the cities of Bologna, Piacenza, Parma, Reggio Emilia, Rimini, Forlì Cesena, Ferrara.

First Rainwater Systems Emilia-Romagna Region Dimensions

Data Sheet Download


Select Article Code to access the Data Sheet for the product.

Article Code

Article
Code
Mq served
Sludge
load
100
Mq served
Sludge
load
200
Mq served
Sludge
load
300
Usable
Volume
F.R. + Sedim.
(mc)
Inlet
Pipes
Diam.
(mm)

Spillway
Code
External Dimensions
First Rainwater System (cm)
First
Rainwater System
Weight (ql)
Cover slab
First Rainwater System
weight (ql)
Static Oil
Separator

Code
Width Length Height h. 15 cm C250 h. 20 cm D400
RAINER01 550 500 450 3,3 125 SCOLM0 180 180 150 38,5 12,1 16,1 DISCE2C-FC
RAINER02 1000 950 850 6,0 160 SCOLM0 180 240 200 57,7 16,1 21,5 DISCE2C-FC
RAINER03 1700 1550 1300 9,5 160 SCOLM2 246 270 200 78,3 24,7 33,0 DISCE2C-FC
RAINER04 2150 1950 1700 12,2 200 SCOLM2 246 270 250 91,4 24,7 33,0 DISCE2C-FC
RAINER05 2600 2350 2000 14,6 200 SCOLM2 246 320 250 102,5 29,3 39,1 DISCE2C-FC
RAINER06 2950 2700 2300 17,0 250 SCOLM3 246 370 250 113,7 33,9 45,2 DISCE3C-FC
RAINER07 3800 3450 2900 21,5 250 SCOLM3 246 470 250 141,5 43,1 57,4 DISCE3C-FC
RAINER08 4150 3750 3200 23,2 300 SCOLM3 246 520 250 152,7 47,7 63,6 DISCE3C-FC
RAINER09 4550 4150 3550 25,5 300 SCOLM3 246 570 250 163,9 52,5 69,7 DISCE3C-FC
RAINER10 5800 5300 4550 32,5 300 SCOLM3 246 720 250 202,8 66,0 * 88,0 * DISCE3C-FC
RAINER11 7050 6400 5500 39,5 300 SCOLM4 246 870 250 236,4 79,7 * 106,3 * DISCE4-8C-FC
RAINER12 7900 7150 6300 45,0 300 SCOLM4 246 970 250 264,2 88,9 * 118,5 * DISCE4-8C-FC
RAINER13 9150 8300 7100 51,0 300 SCOLM5 246 1120 250 297,7 102,7 * 136,9 * DISCE4-8C-FC
RAINER14 9950 9050 7700 55,5 300 SCOLM5 246 1220 250 325,5 111,8 * 149,1 * DISCE4-8C-FC
RAINER15 11350 10300 8800 63,2 400 SCOLM5 2x246 670 250 2x186,2 2x61,4 2x81,9 DISCE4-8C-FC
RAINER16 13000 11850 10200 72,9 400 SCOLM6 2x246 770 250 2x214,0 2x70,6 2x94,1 DISCE4-8C-FC
RAINER17 15700 14250 12200 87,5 400 SCOLM6 2x246 920 250 2x247,6 2x84,3 2x112,4 DISCE4-8C-FC
RAINER18 16150 14650 12500 89,9 400 SCOLM6 2x246 970+920 250 264,2-247,6 88,9+84,3 118,5+112,4 DISCE4-8C-FC
RAINER19 17450 15850 13550 97,2 400 SCOLM6 2x246 1020 250 2x275,3 2x93,5 2x124,7 DISCE4-8C-FC
RAINER20 18150 16500 14100 101,1 400 SCOLM6 2x246 1120 250 2x297,7 2x102,7 2x136,9 DISCE4-8C-FC
RAINER21 20250 18400 15700 112,7 400 SCOLM6 3x246 820+2x770 250 225,2+2x214,0 75,2+2x70,6 100,2+2x94,1 DISCE4-8C-FC


* Cover Slab divided into two parts - The data reported is purely indicative
It is possible to have extensions (bottomless tanks) for all of our products

For Dimensioning with bigger volumes other than those reported in the table, please contact our Technical Department.



Designed in accordance with the current regional regulations (Regional Resolution of 18 December 2006, No. 1860 "Guidelines for the management of rainwater runoff and first rainwater as per Resolution G.R. No. 286 of 14/02/2005";
Expected Sludge Load (SL) coefficient as per Tab.5 DGR 286/05 and 1860/06;

Treatment Warranty:
Legislative Decree 152/06 Part Three, Annex 5, Table 3 "Discharge into Surface Waters" limited to total suspended solids, hydrocarbons, non-emulsified oils and fats, provided that the treatment inflow qualitative and dimensional values are complied with and guaranteed.

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