Referring to the previous article to avoid losses, there are always times when quick action to avoid the high level of sedimentation was failing to be executed. This will fill the clarifier with dirty sediment. In this case, there is no other way, the only way is to stop the milling station. Then the clarifier content is reduced, if possible by operating all existing vacuum filters at maximum speed until the dirty sediment reaches the minimum level. However, with various considerations, technical and economical, usually, some dirty sediment is removed as waste directly.
This cannot be avoided because if waiting for the drop of sediment level with vacuum filter alone, the time will be very long. Thus, the quality of sugar solution may be damaged, so the economic value is low. On the other hand, the boilers continue to operate using fuel oil, sugar cane enter the yard of the factory shall wait to be processed which in turn the sucrose content will be reduced and might be rotten, employees keep working and getting overtime, etc. Thus, direct sediment removal is far more economical rather than keeping it to be reprocessed.
However, this dumping process is usually not recorded both in its volume and its sugar content. Thus, there is no actual losses value is reported. Usually, this loss is often included in the assumption of “unknown losses” (unknown losses). In fact, the amount of sedimentation and sugar content carried along in this direct removal process can be calculated.
Volumetric dumping rate can be estimated by measuring the initial volume of recipient pond or tank and the final volume. By measuring this volume, we can get the exact amount of dumped sediment. While for the sugar content, we can take a sample by diverting a small amount of dumping flow to a small tank throughout the dumping process. We can take an initial, middle, and final sample and then average the concentration. This data shall be recorded well in a log book and can be used to precisely identify how much loss from this kind of activity.