Filter Press Feed with EODD Pumps
Our customer processes silica flour into a variety of Silica and Silicate products used in the Rubber, Paper, Chemical and Dental markets. As part of the silicate process, a wastewater stream is generated containing unreacted silica which is reusable, as well as waste solids. The solids are separated from the liquid components during the subsequent filter press feed. The filter press provides effective separation, ensuring high dry solids content in the filter cake and maximizing the recoverable/reusable silicate water.
Process Optimization with Diaphragm Pumps
The new filter press system would include two diaphragm pumps. Our customer has typically used Air Operated Diaphragm (AOD) and centrifugal pumps within the process, and so these were evaluated. In conjunction with the press OEM, diaphragm pumps were selected as the best applied technology for the process. However, air usage and the subsequent cost were also of concern and so our customer explored the possibility of using electric driven diaphragm pumps in lieu of the AODs. As a result, ABEL model EM pumps were chosen and installed in the process.
A year after start-up, the ABEL model EM electric diaphragm pumps perform well with minimal wear part replacement. Along with the recessed plate filter press, the EM positive displacement pumps remove nearly two times more silicate water for reuse than the previous belt press system (I.e. an improvement of the filter press cake from 44% solids by weight to 72% solids by weight).