EOLO2 is a very compact, robust, power saving aerating cum agitating device extensively used in the aerobic biological treatment of domestic and industrial effluents replacing mechanical surface or floating aerators and dispersed air aeration systems employing compressors and blowers. EOLO2 is a submerged pump system that delivers its output at the point of its submergence with introduction of atmospheric air just prior to the delivery point. In the process, infinite very fine micro-sized bubbles get generated in the cone of deliverance in front of the discharge nozzle. The oxygen of the air gets dissolved in water at the air / Liquid interface. Because of infinitely fine numerous bubbles, the surface area of interface is far larger than other air dispersion systems. The efficiency of dissolution thus increases vis-à-vis other systems.

The system works well with depths of aeration tanks from 0.5 m to 4.0 m. However, the best results are met at a submergence of maximum 1.8 m. The system operates by creating a high speed vortex through the propeller rotation at 2800 rpm within the water. The vortex induces a high level suction at atmospheric air through the air intake pipe. The air is again diffused into minute micro air bubbles by the propeller and is released as bubble-mist with in the water body. The continuous flow of micro bubbles at depths within the waste water triggers a high efficiency oxygen transfer rate which enforces a higher Dissolved Oxygen. This dissolved oxygen inter-alia leads to its availability for utilization by the bio-mass in reduction of BOD and COD.

EOLO2 has been successfully used in the following types of effluents such as Dairies, Food Processing and Beverages, Chem Dyes, Textiles. Sewage

In the Aerobic Biological Treatment of Domestic and Trade Effluents, mechanical method using surface aerators and dispersed air aeration system employing compressed or under pressure air have been prevalent for quite some time.

The primary aim being to force air and water (effluent) meet face to face, provide an opportunity to oxygen of the air to come in contact with the liquid face, dissolve as molecular oxygen and be available to the bacteria for the biological stabilization of the dissolved organic matter in the effluent.

The secondary aim has been to keep the entire mass agitated to guard against any settlement of solids in the vessel. The efficiency of the system in the dissolution of the molecular oxygen depended on the total area of air/water interface generated per unit time.

In the case of blowing/compressed air system, it indirectly depended on the type of air distribution and dispersion (diffuser) system provided in the tank including the size and distribution of the bubbles in the tank volume. These systems by and large failed as a result of inability to ensure homogeneous / constant air pressure in the air distribution network and also due to either choking of the pores of diffusers (porcelain make) or opening of the pores of the diffusers (synthetic mats) due to continuous use.

An application of the submerged pump delivering its output within the contents at the point of its submergence with atmospheric air introduction just prior to the delivery point has yielded excellent results in aeration / agitation of the contents of the tank. Infinite very fine micro sized bubbles get generated in the core of the deliverance in front of the nozzle. The ultimate answer to effluent treatment by aeration is offered by “ACQUA & Co. of Italy. All branches of “Mahabal Enviro Engineers Pvt. Ltd.” have been authorized to interact with the user representatives for promotion of the system and for providing and satisfying the user organization at• no extra cost. The best dissolution of oxygen is achieved at submergence of 1.0 to 1.5 m even in tanks with liquid depths of 3 m and above. The systems are installed in floating mode with self supporting floats and are installed at a downward inclination to dislodge even the settling solids, thereby keeping the entire mass in suspension. Four systems have been developed and under use. These are nicknamed as ECO2, EOLO2, BRIO and RIO.

In the present scenario, power saving is the major requirement. It has been proved that the efficiency of the system is more than three times than the standard best Surface Aerators. The job normally carried out by a 5 H.P. surface aerator is better done by a 1.2 H.P. EOLO2. in addition to nearly 70% saving in Power Consumption (task to task in comparison with surface aerators) there are many other advantages of the system, such as quick installation (less than one hour), light weight (20 kg including floats), has 180°, operating angle at any submergence, non-corrosive, robust and available in a combination of effluent quality applications. In addition to cutting down the operation costs to a large extent due to about 60% savings in power consumption, the units are low in maintenance costs and lost operating time. Above all the capital costs are comparable with conventional surface aeration systems.