Modeling of filter cake washing performance from lab experiments on belt and drum filters

An easily usable model for cake washing is derived from experiments. The parameters of the model can be determined by a minimum of experimental effort. Adopted to the description of the filtration process on continuous belt and drum filters the model shows that the achievable wash ratio (volume of wash water per volume of pores in the cake) is to a large extent independent of the process parameters frequency and pressure difference. The influence of these parameters on the final purity of the cake depends on the regime (replacement-transition-time controlled regime) washing ends in.