Washed -out sand wastewater recovery device

The utility model discloses a washed -out sand wastewater recovery device, including multistage grit washer and a plurality of sewage reservoir, grit washer sets up with sewage reservoir one -to -one,and every grade of grit washer and being linked together rather than advancing the pond pipe through sewage between the corresponding sewage reservoir communicates through chlorion filter equipment between the sewage reservoir that upper and lower level grit washer corresponded, is linked together through recycle -water reservoir 3 between the grit washer of last one -level and the sewage reservoir that next stage grit washer corresponds, be provided with suction pump, chloride ion detection module and water valve on the recycle -water recirculation pipe, the chloride ion detection module ismeasured when the chloride ion concentration of sewage is greater than the setting value in the recycle -water recirculation pipe, the suction pump with the water valve cuts out. This washed -out sandwastewater recovery device