Sludge Treatment Technology
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■SLUDGE TREATMENT Wastewater treatment is becoming more critical due to diminishing water resources, increasing wastewater disposal costs, and strict discharge regulations that have lowered permissible contaminant levels in waste streams. And sludge disposal is a very important stage for municipal and industrial water and wastewater treatment plants. The essential point of sludge disposal is the sludge dewatering. The main aim in sludge dewatering is to minimize the water content in the sludge cake, in most economical way. The selection of the appropriate sludge-dewatering technique depends on the characteristics of the sludge to be dewatered, available space, and moisture content requirements of the sludge cake for ultimate disposal. For a good dewatering, size and firmness of the sludge agglomerates are important, so that these remain porous during the compression. Flocculants are often used to achieve as high as possible drying material contents at the machine dewatering and must be specifically co- coordinated with the accruing sludge. Filtration is the most widely used method in the treatment of sludge produced by wastewater treatment. It can consist just in drainage though sand beds or it can be mechanical under vacuum middle or high pressure conditions which require more sophisticated equipment. Astim offers different sludge treatment equipment for different applications. These equipment can be classified as: • Chamber Filter Presses • Belt Filter Presses • Gravity Belt Thickeners

CHAMBER FILTER Pressure filtration is a very cost effective way of producing sludge cakes with high DS concentrations, along with an extremely high degree of clarity in the filtrate. Because of the simplicity and flexibility, the Chamber Filter Press is the most used and reliable machine for solid / liquid separation and sludge dewatering plants. Chamber Filter Presses accomplish three goals in their applications: • Low cost disposal in the case of wastewater sludge • Reduced cost from further drying of the cake as a product in the case of industrial slurries • Purified filtrate with a high...

BELT FILTER Belt Filter Presses provide the premium process for continuously converting slurry into a moist cake. The sludge is processed in three distinct stages: • Gravity drainage Astim Belt Filter Presses are designed for highly efficient, reliable and simple liquid/solid separation: providing low capital, operating and maintenance costs. With its extended pre-dewatering zone and two perforated dewatering drums Astim Belt Filter Press ensures optimal treatment and compaction of the flocculated sludge. As a standard Astim Belt Filter Presses have carbon steel with hot dip galvanized or...

Gravity Belt Thickener and Belt Filter Press as Combined Unit GRAVITY BELT Gravity Belt Thickener during installation Thickening is the practice of increasing the solids content of sludge by the removal of a portion of its liquid content. A modest increase in solids content can decrease total sludge volume significantly, entailing reduced size requirements for subsequent treatment units. Sludge thickening methods are usually physical in nature; flotation and gravity belts. After the thickener, sludge can be fed to the digestion tanks or dewatering machines. Belt Filter Thickeners can be...