Treatment Technologies

The Advanced Activated Sludge Process or three-stage A2O process consists of a Modified Ludzack-Ettinger (MLE) process for nitrogen removal, with an anaerobic zone in front for phosphorus removal .The process is called A2O since it consists of anaerobic/anoxic/oxic (aerobic) tanks in series. The RAS is recycled to the anaerobic zone. The anaerobic zone is followed by an anoxic zone for nitrogen removal through de-nitrification. IR is recycled from the aerobic zone to the anoxic zone at a rate of 100 to 400 percent of influent. Nitrogen removal is limited by the IR flow and this is achieved by means of IR gates contrary to the heavy duty pumps which consumes high amount of power . This is a relatively simple process to operate. The process has a small footprint.

Features which Makes the A2O Process Advanced

• Incorporation of High Efficiency Triton Type Aerators which have deeper mixing capability up to 10m.
• Deeper Tanks so lower foot print area
• Inter Re-circulation by means of gates inbuilt in the design in contrast to the heavy submersible IR pumps. Which proved to be energy efficient .
• Able to avoid the usage of chemicals for Phosphorus removal.
• Complete BNR removal without use of any Chemicals unlike other Traditional Ditch & SBR system wherein chemical dosage is necessary.
• Lower HRTs compared to conventional process.
• Low Operation & maintenance cost
• Ease of Installation & Commissioning
• Customized Tank Designs based on the Effluent characteristics catering both domestic/municipal/industrial effluents.

Features of ASBR

• Fewer tanks and up to 30% less footprint than conventional treatment systems.
• Highly efficient aeration system minimizes the power consumption.
• Minimal equipment’s makes maintenance easy with simple operation.
• Robust stainless steel equipment’s ensures a long service life and reliability.
• Single or multiple basins to provide operational flexibility.
• Available capacities from 5,000 GPD to 50+ MGD (20 – 190,000m3/d)
• Domestic And Municipal Wastewater Applications

Rural communities, Towns and Cities

• Airports and Military installations
• Housing and Commercial developments
• Schools, Hospitals and Shopping malls
• Septic tank wastewater treatment
• Resorts & Motels
• Highway rest areas and Recreational facilities
• Apartments and Condominiums
• Industrial Wastewater Applications

ASBR can be used for a wide variety of applications where the wastewater is biologically degradable, such as :

• Food, Beverage and Confectionery
• Paper, Board and Textile
• Wineries
• Petrochemical, Refinery and Paint
• Anaerobically pre-treated effluents
• Electronics and Manufacturing
• Pharmaceutical, Perfume and Personal care

IFAS (Integrated fixed film activated sludge) is a treatment process, combining suspended and sessile biomass. Equivalent to a conventional activated sludge process, necessary microorganisms for the biological treatment exist in sludge flakes that are suspended in the waste water. In addition a media is placed into the treatment tank in order to attach a part of the biomass (sessile biomass). With the attached growth more biomass is available in the system. More biomass simply means more microorganism and more micros are able to tackle more or higher polluted waste water.

What it is & How it Works?

• It is PDMS hollow fiber membrane with 0.3 mm diameter & 0.1mm wall membrane
• It is Gas permeable membrane
• Bacteria in the form of bio film grows on the outer surface of the hollow fiber tube (fixed film)
• Air at low pressure (not against water head) is blown the hollow fiber tube, saves power (op ex)
• O2 (oxygen) diffuses through the wall of membrane to the base of Bio film, which is surrounded by anoxic waste water
• Simultaneous nitrification & De-nitrification takes place in the same tank (saves Cap.Ex.) no need of large recirculation of nitrite to nitrate (Op.Ex. saved)
• Ammonia in water diffuses to the base of bio film, where it is nitrified to make Nitrite and Nitrate
• Both Nitrate & nitrite diffuse to surface of Bio film at outer layer, where they are combined with COD & BOD of water & De-nitrify.

Advantages

• MABR offer 95% oxygen transfer efficiency, whereas conventional systems offer around 30%
• No back wash needed as liquid does not pass through the membrane, only gas
• (Air & o2) pass through.
• Air passed through hollow fiber tube, not subjected to head pressure of water level,
• So low pressure @ 150 mBar

Application

Retro fit for existing STPs and ETPs, to augment capacity of treatment & enhance treated water quality with BNR, no civil work in existing plants, packaged plants for STPs, 100 / 200/ 300 KLD Modular units with BNR.

Package Treatment Plants, the Moving Bed Biological Reactor (MBBR) Process and Sequencing Batch Reactor (SBR) Process for sewage biological treatment will integrate with the best innovations in convenient treatment frameworks according to the Prefabricated Treatment Packages that is required for treatment process type and environmental conditions. India’s MBBR wastewater treatment plant will improve reliability, reduce effort, and require less space than traditional wastewater treatment systems. The SBR wastewater treatment plan will clean the incoming wastewater with enhanced flexibility as well as lower sludge production.

In order to improve the quality of treatment and increasing the waste water treatment capacity, Euroteck Environmental has introduced MBBR wastewater treatment plant and SBR wastewater treatment plant in India and to be a total solution for environment protection we had come up with a new concept.

Advantages of Prefabricated Packages Plant

• Short time manufacturing
• Compact & beauty design
• Small foot print
• Simplicity of installation and operation
• Low capital and operating costs
• Reusable treated effluent for irrigation
• According to environmental standards
• No need to construction
• Quick Installation
• Long service life

EUROTECK builds total energy systems with guarantees of power in kW and temperature for the need of the customer. The system includes sewer pipe, heat exchanger, connecting pipes, any type of heat pumps (electric, gas motor, absorption), peak boiler, all installations in the energy plant, control systems.

In addition of this variety of opportunities to implementation, there a three new important developments:

• The patent of an Anti-fouling-System to prevent the formation of slime (biofilm).
• The new material developed by Arcelor-Mittal (chrome steel) provides improved thermal conductivity by about 80 percent.
• A supervisory control system for bivalent systems with alternative energy sources.
• We is always ahead in research and development, having invented an anti-fouling system to prevent the formation of an insulating biofilm and a new heat exchanger material with a 80 % better heat conductivity.

Thanks to all these new developments it was possible to increase the heat extraction rate by up to 40%. That means, without the anti-fouling system and without the new ferritic steel, the heat exchanger chains would have to be 40% longer. Together with a bivalent process control system, sewage heat recovery plants now score with a return-on-investment of 2 – 6 years.

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