A Gravity Belt Thickener employs gravity drainage through a filter belt to thicken conditioned sludge prior to digestion, mechanical dewatering, or trucking to a land application site or disposal site. Dilute sludge (typically 0.5% to 1.0%) is introduced at the feed end of a horizontal filter belt.
The two key operating parameters for gravity thickening are the sludge hydraulic loading rate (HLR) per unit belt width and the belt speed. The hydraulic loading rate is normally in the range 7−35 m 3 /h per m width, with an accompanying solids loading rate of 90−1600 kg/ (m.h), at belt speeds ranging from 300 to 1200 m/h. People also ask How does gravity belt thickening ( GBT ) work? Gravity belt thickening (GBT) increases the sludge solids concentration (i.e. thickens the sludge) by allowing the water (or filtrate) to drain from the sludge under gravity through a permeable medium (a moving belt) on which the sludge sits. There are two types of belt-based processes for increasing sludge solids concentration. www.sludgeprocessing.com/sludge-thickening/gravity-belt-thickening/ What are the operating parameters for gravity thickening? The two key operating parameters for gravity thickening are the sludge hydraulic loading rate (HLR) per unit belt width and the belt speed. The hydraulic loading rate is normally in the range 7−35 m 3 /h per m width, with an accompanying solids loading rate of 90−1600 kg/ (m.h), at belt speeds ranging from 300 to 1200 m/h. www.sludgeprocessing.com/sludge-thickening/gravity-belt-thickening/ When is gravity thickening of combined sludge not effective? Independently, gravity thickening of combined sludge is not effective when activated sludge exceeds 40% of the total sludge weight, and other methods of thickening of activated sludge have to be considered. Part B: Operation and Maintenance 5 - 2 CHAPTER 5: SLUDGE TREATMENT FACILITIES cpheeo.gov.in/upload/uploadfiles/files/operation_chapter5.pdf What's the difference between GBT and belt filter press? GBT is a low-pressure process which operates by allowing the water to drain from the sludge under gravity. A belt filter press, on the other hand, operates by squeezing water from the sludge under pressure, and achieves a higher dry solids concentration as a result. www.sludgeprocessing.com/sludge-thickening/gravity-belt-thickening/ www.bdpindustries.com › wp-content › uploads2 Feedbox: Upflow design constructed of 304 or 316 stainless steel. Full width weir for smooth transition to the belt, utilizing the complete area of the gravity deck. 3 Gravity Deck: UHMW plastic slide strips support the belt and can be easily removed with no disassembly. Apex curvature along centerline of belt eliminates belt wrinkling.