The preliminary study on biological reclaiming process of waste water from wet reclaiming of used sand with sodium silicate was introduced.This process was performed by culturing a diatom,Nitzschia palae,which need Na+ and SiO2+3 ion in the medium,in the waste water of wet reclaimation of sodium silicate used sand to consume the Na+ and SiO2+3 ion,so the alkali content of waste water decreased.The key technology of the processing was as following: diatom species selecting principle for reclaiming method of ...