Device and method for decreasing temperature of DSD (4,4'-diamido diphenylethylene-disulfonic acid) wastewater

The invention relates to a device for decreasing the temperature of DSD (4,4'-diamido diphenylethylene-disulfonic acid) wastewater. The device disclosed by the invention comprises a wastewater buffer tank and a resin adsorption device and further comprises a glycol ice maker, a cold analysis tank, a suction filter tank, a wastewater collecting tank, a vacuum pump, a wastewater conveying pump I and a wastewater conveying pump II. Oxidized wastewater in the cold analysis tank is cooled to 2-5 DEG C by utilizing the glycol ice maker; the content of analyzed sodium sulphate is about 20-22%; the content of sodium sulphate after carrying out suction filtration and separation in the suction filter tank is increased to 45-50%; the salt precipitation working section is recycled; the salt content in separated wastewater is decreased to 5-7%; then, wastewater enters the resin adsorption device. According to the invention, the glycol ice maker, the cold analysis tank, the suction filter tank and the vacuum pump are mainl