Equipment For Wastewater Treatment Plants

Akar surface aerators are the vertical shaft aerators which provides mechanical means of oxygen transfer to sewage or industrial effluent. Manual, or any required degree of automatic control can be provided, including adjustment of aeration intensity by dissolved oxygen monitoring. Akar surface aerators are available for conventional bridge mounting or floating. Akar Surface Aerators can be installed in any configuration within aeration lanes thereby offering a broad range of treatment capabilities from small communities to major installations.

Akar manufactures a wide range of floating aerators in different designs and sizes. These are designated as NSA-FL range. The aerators are equipped with heavy duty TEFC squirrel cage motors with IP-55 protection such that are able to withstand open weather conditions and 24 hour operation. Floats supplied are of FRP and are filled with polyurethane foam for long floating life and for securing it against accidental mishaps.

Industrial effluent treatment plant mixers use a shaft, screw, blades or impellers to mix waste water (sewage or industrial effluent water). They are also used in other industrial applications. Industrial mixers force sediment to flow in one direction and can intensify physical and chemical processes. In water treatment mixers or agitators are employed to mix/agitate chemicals, polymers, coagulants and flocculants with or in water. Akar Mixers are robust meant for continuous workability. They operate round the clock for may years. Yet they are simple to maintain and repair.

Akar manufactures and supplies a variety of sizes and types of screens. Screens remove large particles contained in the waste water. Larger Sewage Treatment Plants or Industrial Effluent Treatment plants have automatic screens. Smaller plants have coarse, manually cleaned screens. A screen is a barrier designed to remove solids as sewage passes through it. The amount and type of solids trapped depends on the size of the gaps in the screen. Typically two types of screens are used:

• Coarse screens with 10 mm to 25 mm gaps for removing large objects pieces of wood, textiles etc) and,
• Fine screens with a 0.1 mm to 3 mm gap for removing smaller debris, most plastics, textiles, pens, etc.

Akar automatic screens designs depend upon cliet's specific requirements and site conditions. Depending upon a multiple factors such as depth at which the effluent is available, space constraints

Akar has supplied a number of diffused aeration systems for a variety of applications. There are a wide variety of diffused aeration systems and diffusers. Generally in these systems, air is injected into the effluent water at a given pressure such that in the ultimate analysis, the water receives the desired quantity of oxygen in given time to maintain a given level of Mixed Liquor Suspended Solids (MLSS). The air is generally injected through network of piping and diffusers. Twin lobe blowers of required capacity supply compressed air. The compressed air imparts oxygen to water through contact which air bubbles make when rising to top after injection. Akar supplies all types of diffused aeration systems.

Filter Press is a device working in principal of pressure filters. The sludge is compressed between a fixed head on one end & one movable bulk head on the other end. Pack closing force is provided at free end. Filter pack is supported on two parallel tie bars. A filter pump is applied to feed the moist sludge with solids & liquids through feed nozzle of the filter press to the chamber formed between the plates and the medium, leaving the solid trapped inside and the liquid drained out. Cake which is built in the hollow space between the plates will fall out once the pack is opened. Filter press is the most efficient and most employed in sludge demoisturising applications. Filter press is a very efficient equipment in waste water sludge separation, biological and chemical sludges. We offer manually and hydraulically operated filter presses.

Frame : Mild steel, Solid steel, Cast iron, Stainless steel (SS 304 / 316)
Filter Plates : Polypropylene, Cast iron.
Closing Devices : Ratchet Gear / Hand Hydraulic / Power Hydraulic

Sludge thickener mechanism supplied by Akar is basically an aerobic system which by means of natural bacteriological process concentrates sludge thus reducing volume of sludge for easier transportation and usage. The sludge is supplied with air to provide oxygen to maintain and expedite concentration. The thickener mechanism has a shaft supported on top by bush and hung from central scrapper bridge cum walkway. Top of the shaft is connected to gearbox output by small gear. The shaft shall have rake arms on both the sides. The scrapper blades are fixed on scrapper bridge arm bottom. The blades scrape, push and demoisturize the sludge. The blades shall push the sludge to central sludge pit. The gear train with which the top of the shaft is connected shall consist of motor, gear and related drive assemblies. Other items and accessories shall be as per emailed inquiry items 1.1 to 1.9.

Strictly speaking the word "Sludge Thickening" is a broad term which means reducing the sludge volume by demoisturising sludge. Demoisturizing can be done in many ways. Water content in sludge can be reduced by mechanically compressing sludge in filter press, belt press etc. this can also be achieved by centrifuge mechanism and also by other mechanical devices. Sludge drying beds are also used to dry sludge. Akar supplies all the devices to concentrate sludge.

The trickling filter is one of the oldest and simplest aerobic biological treatment processes used. These rotary distributor devices are mainly used for sewage treatment on remote sites. This device is used for low electrical power consumption, basic effluent quality level requirements and low levels of technical expertise. The trickling filter is also sometimes used as one of the stages of biological treatment, in a complex industrial waste water treatment facility. Over a period of time the lower layer of microbes do not get enough oxygen and shift to anaerobic endogenous metabolism. The under drain system is a network of channels discharging into the main collection channel running down the middle of the unit. The settled sludge returns to the primary clarifier.