The wet cleaning system comprises a pulper, aqua-separator, DSM screens, clarifier, and other components. It is used to wash agro-based raw materials to remove impurities such as silica, dirt, and remaining pith. After washing the bagasse, the water, along with impurities like sand and silica, flows to the clarifier. The impurities settle there and are stored in a tank via an underflow pump. The overflow water from the clarifier is reused for washing bagasse. The main functions of the wet cleaning system are efficient washing of raw materials, removal of pith, and maximum water recovery.

Pulper: The dry depithed bagasse is fed into the pulper, where it is diluted with water to a consistency of 2.5-3%. The high agitation of the pulper rotor loosens dirt and pith, allowing them to be removed in the aqua separator. The pulper is designed based on the plant’s capacity.

Aqua Separator: The aqua separators remove loose and dissolved organic and inorganic solubles and fines, while simultaneously draining the suspension by gravity. The raw material is lifted by an inclined conveying screw of special design over the dewatering section of the screw trough. The screw and trough are made of welded steel sheet construction, with a perforated sheet plate at the bottom for drainage. The aqua separator features an inclined conveying screw with screw flights made of SS 304. The outlet consistency from the aqua separator is around 15-20%.

B-2 Thickener: The water, along with some fiber and pith from the aqua separator, is fed into the B-2 Thickener, where the fiber is separated from the water suspension. The B-2 Thickener has a fine wire mesh and is driven by CI rollers, a girth gear, and a pinion. The fiber and pith from the B-2 Thickener are fed into the boiler along with the dry pith. The water from the B-2 Thickener is further treated in the clarifier.

Clarifier: The filtrate water from the B-2 Thickener is treated in the clarifier to remove suspended solids. Dust and silica are removed in the clarifier. The underflow from the clarifier is used in landfills, and the clarified water is reused in the pulper with dry bagasse.