Device for treating sewage by using dry strength agent production wastewater

The utility model provides a device for treating sewage by using dry strength agent production wastewater, which comprises a sewage regulating tank, a sewage coagulating tank, a coagulative precipitation tank and a biochemical treatment tank which are sequentially communicated through pipelines, and a sewage pump is arranged between the sewage regulating tank and the sewage coagulating tank. The sewage coagulating basin comprises a first coagulating basin, a second coagulating basin and a third coagulating basin which are sequentially communicated, the first coagulating basin is communicated with an acid-base tank, the second coagulating basin is communicated with a polyaluminum chloride tank, and the third coagulating basin is communicated with a dry strength agent production wastewater tank. The utility model further provides a sewage treatment method, by the aid of the device and the method, the dry strength agent production wastewater can be effectively utilized to flocculate and purify the sewage, and th