Euroteck Environmental Pvt Ltd

Kondapur, Hyderabad, Telangana

Rake screens of various measurements are made of stainless steel AISI 304 or AISI 316 on customer demand. Measurements of the rake screens are chosen relying upon required flow rate, wastewater arrangement and measurements of the channels.

The rake screen is a separating mesh comprising of bars introduced into a frame. The bars are produced using primary shapes with a tear drop formed cross segment that improves stream attributes of the filtering mesh. The screen’s filtering mesh can also be made of rectangular or round profile bars.

Bar dispersing in the filtering mesh can change from 5 – 100mm for normal hardware or can be changed exclusively. The rectangular edge comprises of two longitudinal sheets associated by cross shafts. The covered hardened steel chains can be moved along polymer guides installed on the longitudinal sheets of the screen. Chain strain is movable.

Cross rakes are introduced on the chains for cleaning of the filtering mesh. Chains and rakes are impelled by shaft rotation with drive sprockets situated in the screen top segment. The shaft is driven by a motor. At the screen base, the chain is moved along a pilot slider made of a wear safe polymer material. In this way, there are no pivoting parts in the lowered segment of the screen.

The screen is introduced onto a hub of an extraordinary turning prop mounted on the wall of the channel or onto unique stage affixed in the channel while the actual screen can be lifted over the channel for upkeep. In the event that there is an absence of room in a short station without probability of screen lifting, an extraordinary adaptive stage is utilized

Operating Principal

The rake screen gathers and eliminates solids from wastewater that bigger than bar separating. The solids are regularly taken off from the sifting network by the rake moving them to the top edge of the edge. The solids are then eliminated from the rake by methods for a kicker and dispatched along the gravity slide onto a carrier or into squander container. The screen operation periodicity depends on the chosen equipment automation scheme and defined by technological commission results.

Advantages of Bar Screen:

• Protection from mechanical and pressure-driven over-burdens because of high tensile design in correlation with different kinds of mechanized screens
• High hydraulic efficiency is achieved by using tear-shaped bars that cause a pressure gradient to the mesh and across the bar spacing
• The tear molded profile also shields the screen from waste sticking inside the filtering mesh. By utilizing this plan, such blockages can be eliminated by rakes, permitting the screen work uninhibitedly;
• High dependability, accomplished by the shortfall of the turning parts in the submersible part
• Submersible parts like packaging, bars, chains and rakes are made of tempered steel to improve consumption obstruction in forceful conditions of wastewater;
• Improved ergonomics: the practicality of the screen because of openness of the principle units inactivity and screen lifting without demounting.

Automation :

• Screen automation is possible as per various boundaries:
• Timespan.
• Wastewater level contrast upstream and downstream of the screen.
• Any modified program.

Alert frameworks are accommodated the typical activity sign, the crisis stops, the wastewater high level in the channel and others. It is conceivable to move gear status information to a more significant level automated process control framework relying upon the customer’s necessities. The screen is provided with a security device jet lever to evade harm to the screen, for example, chain extending or breaking. The security gadget and stops the screen activity in case of any jam or mechanical hindrance to the chain development. Light and sound alerts turn on all the while when the safety device activates. The screens along with a conveyer, compacting press and slide doors are remembered for an elite complex for mechanical wastewater treatment. Outfitting the control system with programmable modules makes it conceivable to coordinate complex sub systems into one system with a common control centre and remote dispatching.

Working

The Grit Chamber operates on the vortex principle.

• The stirrer maintain rotational velocity allowing grit to settle while holding organics in suspension.
• Sloped transition between upper chamber section(s) and grit well promotes grit settling to well.
• Grit transferred from grit well to tangential grit conveyor via pump where the grit is washed intermittently.
• Grit is agitated by the mixing device to improve grit washing process.
• The grit is discharged into the storage container or onto the transporter.

Advantages of Vortex Grit

• Construction is ideal for wastewater treatment plants with lesser footprints
• Does not require high capital costs low capacity STPs
• Increased efficiency by using tangential motion of the fluid
• Casing manufactured from stainless steel is reliable and durable

A process cycle ideal for small-to-medium installations comprises, screening (filtergrilles), primary sedimentation with a sludge digestion chamber (Imhoff), biological wastewater treatment with RBC and secondary sludge separation via cloth filter. In compact biocombi installations offered by MITA Biorulli, biological treatment is achieved by means of a partially submerged roller-contactor upon which forms the mass of biological slime: this is created by the growth of micro-organisms which derive their nutrients from the colloids and substances dissolved in the wastewater. MITA Biorulli biocombi series installations do not need final settling tanks; their place is taken by a cloth filter, essentially comprising a horizontal drum in perforated steel sheet covered with a special filter cloth and equipped with an appropriate removal system for the separated sludge.

Maintenance is significantly reduced in comparison to traditional plant types and it can be performed by non-specialist personnel. The biological wastewater treatment phase is achieved with a biodisk, comprising parallel polypropylene disks fitted to a central shaft. The diameter varies according to the plant size, from 2, 00 m to 2, 40 m. The disks have 40% of their surface submerged in the water to be treated and represent an ideal support for the bacterial mass.

The cloth filter replaces the secondary settling basin; moreover it ensures a high effluent quality even when both hydraulic and/or suspended solids loadings are variable. The biologically treated water can reach the discharge only via the filter cloth. Its surface acquires a progressively increasing sludge layer which causes an increase in pressure drops. A level sensor activates a pump which, via a suction system placed in contact with the drum, draws, from inside, the water necessary to back-wash the filter cloth.

The sludge removed by the water is run back to the primary settling tank, if there is one, or elsewhere. The filter cloth is fabricated using a free-fibre “Polstoff” synthetic material, composed of innumerable overlapped small fibres which provide a very high effluent quality.

Key characteristics

• IDisks are partially submerged (40%) in the liquid to be treated.
• Deeper Tanks so lower foot print area.
• Several phases of treatment (biological treatment and sludge separation) are grouped together in a single tank.
• Process sludge removal with Mecana system cloth filter.
• Only one gearbox-motor set for movement of the biodisk and filter the filter is firmly connected to the biodisk shaft.
• Moving parts (disk and fi lter drum rotation) actioned by a motor-gearbox set with output power between 0, 75 and 1, 5 kW.
• Supply includes basin in treated and painted carbon-steel with easily removable modular covers in FRP and an electric control panel with IP 55 protection.
• Discharge concentrations compliant with current wastewater treatment standards.

Advantages

• Minimum energy consumption.
• Reduced maintenance.
• Easy access.
• Reduced installation space requirements (compact construction).
• Little sensitivity to sudden variations in hydraulic and/or organic loads.
• High operating safety.
• Oxygen supply without aeration or diffusion systems.
• No fl oating sludge problems.
• Low installation costs.
• Absence of odour nuisance or aerosols.
• Pre-assembled plant, ready to be put into service, complete with electric control panel fi tted on the unit which permit rapid installation and start-up.

Sectors of application

• Small communities
• Tourist complexes and camping sites
• Construction sites
• Hotels
• Schools
• Motorway service areas