Biodisc Biological Waste Water Treatment System

Introduction

Biological Biodisc Treatment has long been appreciated for the clear advantages this application guarantees, namely:

rapid process startup;
silent operation and absence of unpleasant odors;
low electricity consumption;
maintenance and assistance reduced to a minimum;
minimal footprint and therefore low environmental impact.

Biological Biodisc Treatment Plants therefore allow for the biological treatment of domestic and industrial wastewater with high efficiency for both carbon removal (BOD) and nitrification and denitrification processes (nitrogen).
In the Biodisc system, the rotation of the structure allows the biomass and the thin film of sewage adhering to it to come into contact with atmospheric oxygen, enabling its diffusion and utilization. The microorganisms forming the biological flora, placed in direct contact with the two key elements for their development (sewage and air), absorb the greatest amount of organic matter during the immersion phase in the sewage and oxygen during the emersion phase. When the layer of bacterial flora adhering to the discs reaches a thickness of 4/5 mm, it detaches in settleable flocs, which are collected and concentrated in the subsequent final sedimentation phase and from there lifted to the primary digestion phase.
The Biodiscs are housed in Edil Impianti2 prefabricated vibrated reinforced concrete tanks and submerged in the sewage for 40% of their diameter. The Biodisc is made of a series of rollers consisting of a shaft on which a large number of plastic discs are fixed. The shaft is rotated by a gear motor at a speed between 1 and 6 rpm, depending on the diameters and the type of sewage to be treated.

The Biological Biodisc Plant is designed to minimize electricity consumption and maintenance interventions.

Features and Operating Principle

Primary Sedimentation Imhoff Tank
The Imhoff tank is divided into two compartments; the upper compartment is called Primary Sedimentation. This phase is necessary to retain settleable solids to reduce the organic load entering the subsequent biological treatment.

Sewage Lifting/Accumulation
In a suitably sized pit, sewage is collected and sent to biological treatment using submerged pumps. The equalization of the sewage produces the indirect effect of homogenizing the characteristics of the various pollutants.

Biodisc Oxidation
The process is based on aerobic biological treatment with attached biomass, where the Biodisc is used as an inert support on which the bacterial flora develops.
This system is essentially the artificial application of the natural self-purification process (lakes, watercourses), with the difference that the bacteria in the structure (Biodisc Oxidation compartment) are in a higher concentration and in a reduced space.
The support brings the flora itself alternatively into contact with the organic matter contained in the sewage to be treated and with atmospheric oxygen.
The microorganisms forming the biological flora, placed in direct contact with the two key elements for their development and activity, directly absorb the greatest possible amount of organic matter during the immersion phase in the sewage and the proportionally necessary oxygen during the emersion phase.

Final Sedimentation
Final Sedimentation allows for the separation of purified water from the sludge; the surface water flows towards the outlet through a stainless steel peripheral channel with Thompson weirs, while the settled sludge is sent, via a submerged pump, to the head of the Imhoff tank as excess sludge for disposal, following anaerobic digestion.
Secondary or biological sludges are different from primary sludges, which are separated from the raw sewage without undergoing any transformation by bacteria.

Sewage Disinfection
The sewage Disinfection phase takes place in a tank inside which plates are inserted to facilitate a "serpentine path," which in turn causes the slowing down of the sewage and its mixing with sodium hypochlorite.
The time that guarantees good disinfection of the sewage is approximately 30/40 minutes.

Anaerobic Sludge Digestion Imhoff Tank
The produced sludges are conveyed under the hoppers of the Imhoff tank and periodically extracted from the Anaerobic Digestion compartment by tankers, to be subsequently disposed of according to the law.

Sizing

System sizing for discharge in compliance with the threshold limits set by Table 3, Annex 5 of Legislative Decree 152/06 for discharge into surface waters.

For system sizing for discharge in compliance with the threshold limits set by Table 4, Annex 5 of Legislative Decree 152/06, please contact our Technical Office.

Fields of Application

The Biological Biodisc Plant is a purification system for wastewater treatment serving isolated houses, small residential areas, tourist activities, restaurants, schools, hospitals, and other activities not served by the public sewer system.

Civil discharge applications (restaurants, campsites, shopping centers).

Industrial discharge applications such as:
- Wineries
- Paper mill discharges
- Slaughterhouses
- Medium-load industrial wastewater
- Livestock farms
- Breweries
- Wine-producing companies
- Fruit and vegetable processing industries.

Biodisc Biological Waste Water Treatment System from 100 to 200 P.E.

See Dimensions

Supply Specifications

Supply and installation of a Biodisc Biological Waste Water Treatment System from 100 to 200 P.E. produced in DECLARED SERIES, code BIORUL___AE, modular from N.___ P.E., consisting of prefabricated tanks produced under UNI EN ISO 9001 and ISO 45001 management systems, made of monobloc R.C.V. with CE certified materials and recycled content according to the requirements indicated in the Minimum Environmental Criteria (CAM), concrete compressive strength class C45/55 (RCK >55 N/mm²), complying with the provisions of UNI EN 206-1 and UNI 11104 for exposure classes XC4, XS3-XD3, XF1, XA2, internal high-bond steel reinforcement, GREESMIX5® steel fibers (if required), IDROCONCRETE 1200® crystallizing additive for integral system waterproof concrete (if required), accompanied by Chemical Resistance and Reaction to Fire certifications issued by an external body according to UNI EN standards, reinforced with vertical R.C.V. pillars and stainless steel horizontal struts where required, with Elastocolor protective anti-crack elastomeric painting of the external concrete walls with permanent high elasticity and high chemical resistance.
The modular RBC Plant from N.___ P.E. consists of:

Imhoff Tank (primary sedimentation - anaerobic digestion) complying with UNI EN 12566-1 and UNI EN 12566-3 standards, complete with inlet/outlet, corrugated PVC fittings, AISI 304 stainless steel casing or similar, vents, perfectly sealed internal hoppers for the clear separation of the sedimentation/digestion compartments, sludge discharge pipe complete with 63 mm diam. PVC adjustment valve, pipe fixing brackets and PVC pipe clamps;
Collection and Lifting Tank with Electric Pumps complete with inlet, corrugated PVC fittings, n.2 submersible electric pumps Calpeda brand or similar (having the following minimum technical characteristics: 2-pole induction motor, 50 Hz, 230/400 V power supply, class F insulation, IP X8 protection, power 0.55 kW, absorption 2.6/1.5 A, Q= 12 m3/h - H= 6 m, recessed vortex impeller), 63 mm diam. PVC delivery piping, special fittings, flow rate adjustment valves for the oxidation compartment supply, pipe fixing brackets and PVC pipe clamps;
RBC Oxidation Tank complete with heavy-duty steel plates for anchoring RBC bearings, plexiglass windows complete with AISI stainless steel fixing/sliding guides size 60x30 cm, n.2 plexiglass windows complete with AISI stainless steel fixing/sliding guides size 120x60 cm, n.2 diam. 110 PVC glue-on sleeves, n.1 rotating biological contactor with a diameter of 195 cm, disc pack length ___ cm, bearing center distance ___ cm, useful surface ___ sqm, complete with ____ Kw gear motor, with output speed of 1.7 rpm, n.2 SKF ball bearings oscillating adapter type, n.1 central shaft in certified heavy-duty ST-52 carbon steel, plates with hot-dip galvanized steel shaft insertion guides, stainless steel shafts with relative threaded PVC plates, high-density polypropylene discs with a diameter of 170 mm;
Sludge Sedimentation Tank (Dortmund type) complete with n.1 submersible electric pump Calpeda brand or similar (having the following minimum technical characteristics: 2-pole induction motor, 50 Hz, 230/400 V power supply, class F insulation, IP X8 protection, power 0.55 kW, absorption 2.6/1.5 A, Q= 12 m3/h - H= 6 m, recessed vortex impeller), PVC delivery piping, special fittings, adjustment valves, 400 diam. PVC deflector cylinder complete with stainless steel support brackets, Thomson-type weir trough complete with adjustment and support brackets, entirely made of AISI 304 stainless steel;
Final Disinfection Tank made of R.C.V. structure complete with R.C.V. baffles, inlet and outlet, corrugated PVC fittings; dosing kit consisting of n.1 Doseuro brand electronic diaphragm dosing pump or similar having technical characteristics as per the technical report and adaptation to the main electrical panel for the control of the dosing pump with adjustable daily timed activation, complete with suction system on rod with terminal filter;
Technical Compartment made of R.C.V. structure complete with front door made of AISI 304 stainless steel with standard lock complete with grilles to ensure minimum internal ventilation, n.1 electrical panel with programmable PLC logic for the control of the various units.

Treatment Guarantee:
Legislative Decree 152/06 Part Three, Annex 5, Table 3 "Discharge into Surface Waters", provided that the qualitative and dimensional values of the incoming flow to the treatment itself are respected and guaranteed.

View accessories related to the Specifications

Configure the Supply Specification with the related accessories.

Configure the Supply Specification

Biodisc Biological Waste Water Treatment System from 100 to 200 P.E. Dimensions