TREATMENT OF FILTRATE FROM ROTARY VACUUM FILTERS TO AVOID RECYCLING

摘要

Conventionally, the filtrate from the rotary vaccum filters is sent back to the mixed juice that is again chemically treated before entering the clarifier. This causes sucrose loss due to inversion and also, indirectly, due to higher molasses production. A system was developed to treat the filtrate so that it can be sent directly to the evaporators along with the clear juice thus eliminating the recycling. The system was installed in a 5000 TCD plantation white sugar mill. For more than six months, the clarified filtrate from this system was continuously being sent to the evaporators. Additionally, liming and sulfiting of this filtrate was avoided resulting in lower molasses tonnage. The colour of the clear juice was lower, and the resulting sugar had lower colour and turbidity.