During the dewatering process, what can improve filter cake quality?

Using appropriate pre-coat materials significantly enhances filter cake quality during the dewatering process. Pre-coat materials, such as diatomaceous earth or other filter aids, can improve the filtration characteristics of the sludge by creating a porous layer on the filter media. This layer allows for better solids separation, enhances flow rates, and reduces the chance of filter clogging. By optimizing the filtration process, pre-coat materials can lead to drier and more manageable filter cakes, ultimately improving the overall efficiency and effectiveness of the dewatering operation.

In contrast, low pressure application might result in insufficient driving force for water removal, and frequent cleaning of filters, while beneficial for maintaining operations, does not directly improve the quality of the filter cake. Adding more water to the sludge would generally lead to dilution, negatively impacting the dewatering efficiency and quality of the resulting filter cake.