Shivpad Engineers Pvt Ltd Ambattur, Chennai, Tamil Nadu

The under drains system is important both as a collection unit and as a porous structure through which air can circulate. The collected liquid is passed to a settling tank where the solids are separated from the treated waste water. In practice, a portion of the liquid collected in the under drain system or the settled effluent is recycled, usually to dilute strong influent waste water and to bring the filter effluent back in contact with the biological population for further treatment.

SHIV PAD Surface Aerators are available for Municipal Sewage and Industrial waste water treatment applications. They are generally recommended for activated sludge process aerobic digestion or aerated lagoons as well as for pre-aeration. The design of the equipment is on the prime objective to offer a mechanically trouble free equipment, while maximising oxygen transfer and mixing under a variety of conditions. SHIV PAD offers both Slow Speed fixed Type Surface Aerators and Slow Speed Floating Surface Aerators. Oxygen transfer rages from 1.6 to 1.8 Kg HP hr at standard conditions.

Shivpad offers single or multiple draft-tube Digester mixers through which the sludge is circulated by a turbine mixer located within the tube. These units are specially designed to increase the efficiency of digestion and to yield a uniformly digested product. These Digester mixers provide effective mixing of incoming sludge with the digested sludge and increase the rate of digestion. It accelerates the release of generated gas and assists in maintaining better pH control as well. The propellers are offered in a special manganese bronze construction, for increased life of operation. Vertical shafts are generally in forged steel construction. The housing can be either in cast iron or in carbon steel construction. Intermediate bearings are provided depending upon the length of housing. Drive arrangement shall be either direct motor driven or belt driven arrangement as opted by the user.

Shivpad Clarifier find wide application in the treatment of industrial and domestic water treatment and wastewater treatment plants. They afford better-suspended solids removal in the primary treatment and aid solid liquid separation of biologically treated secondary effluent. These units help to achieve a superior quality effluent as well as to maintain a high underflow solids concentration.

The screen is made of bars curved to a radius and the rakes revolve about a horizontal shaft, the axis of which is the centre of curvature of the screen bars. The screenings are thus raked and discharged on to the drainage platform for disposal. The unit is equipped with float control and no manual attention is required.