grit-and-grease-removal-systems
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Common practice for treatment plant design require an effective grit separation in order to reduce the seriously wearing effect caused by grit on the process pumps and other mechanical equipment, to minimize the maintenance costs. Grit and other in-organics can be separated by longitudinal or circular grit removal systems. Grease can also be floated and separated from the stream by aeration, whilst the organ ics are retained in suspension for subsequent treatment. ASTÏM provides manufacturing and installation services in a wide equipment range for removal of grit and grease in industrial and municipal waste water treatment plants. Astim grit and grease removal equipment are specially designed to fit in every type of concrete or steel tanks. Designed to work automatically by local control panels using PLC or conventional systems which can be controlled locally, or remote from main control cabinet, they require less operator attention. The grit removal equipment can be designed in different styles. Main systems are; • Travelling Scraper for Longitudinal Tanks • Central Driven Rotating Scrapers for Circular or Square Tanks

GRIT SCRAPERS The oldest and still mostly used valid design of grit removal tanks is longitudinal grit chamber where the flow is horizontal and velocity controlled. The basis of design of longitudinal grit chamber is that under the most adverse conditions, the lightest of grit will reach the bed of channel prior to its outlet end. Nevertheless aerated grit chamber design has improved this approach. Air is introduced along one side of the rectangular tank to create a spiral flow pattern perpendicular to the flow through the tank. By this the heavier particles that have higher settling...

CENTRAL DRIVEN GRIT SCRAPERS Central Driven Grit Scraper with two, three or four scraper arms are manufactured for installation at pier supported or peripheral carried concrete or steel structure bridges. The scraper blades are mounted on arms which are connected to a rotating shaft. Central Driven Grit scrapers are generally used in cross flow square concrete tanks which has flat or inclined bottom structure. The water is generally fed from one edge of the tank. As it flows through the overflow edge which is located at the opposite of the water entrance, the grit is settled at the bottom....

Grit Separator during operation Grit Separators with inclined shaftless spiral TREATMENT SYSTEMS High organic content in the grit shall be a problem for recycling and disposal of grit. Reduction of the organic content is the primary aim in order to make a secure disposal or recycling. To reach this aim in an economic way, the treatment process must be tailored to meet the requirements. A suitable process must be selected and modified relative to the conditions. Grit Treatment Systems are used to reduce the water content inside the collected grit-water mixture. Also the organic matter is...