In the soy sauce production process, solid impurities in the soy sauce need to be filtered to ensure the appearance and taste of the final soy sauce product. Closed pressure leaf filter is used for filtration, which greatly improves production efficiency.
Diatomaceous earth is used as a filter aid when filtering soy sauce using a pressure leaf filter. Diatomaceous earth can adsorb some fine impurities. Pre-coating is to evenly apply a thin layer of diatomaceous earth on the pressure leaf filter before formal filtration to form a stable pre-coating layer. The thickness of the pre-coating layer is generally about 1 to 2 mm, but it should be based on the satisfactory clear filtrate obtained during the pre-coating cycle. Adding means continuously adding diatomaceous earth to the soy sauce during the filtration process. These diatomaceous earths are continuously accumulated on the pre-coating layer to form a loose filter cake, which improves the permeability of the filter cake and can maintain effective filtration for a long time.
Pressure leaf filter is now widely used for soy sauce filtration. It has obvious technical advantages and significant economic benefits: The structure is compact and occupies a small area. The filter is made of high quality stainless steel and carbon steel. Since the filter is equipped with a vibration device, it can realize automatic cake discharge, low labor intensity, clean and hygienic, and low pollution; closed continuous production, large processing capacity, fully automatic operation, and optimizing on-site management, low filter loss and high economic benefits.
