Treatment method for dimetronidazole production wastewater

The invention discloses a treatment method for dimetronidazole production wastewater. The treatment method for dimetronidazole production wastewater comprises the following steps: step 1, collecting the wastewater; step 2, performing reduced pressure concentration so as to reduce the volume of the wastewater to 1/3-2/3 of the original volume, filtering the concentrated wastewater at 35-55 DEG C, recovering solids and collecting the filtrate; step 3, carrying out low-temperature crystallization and centrifugal spin filter on the filtrate obtained in the step 2 at 5-10 DEG C, recovering solids and collecting the filtrate. The wastewater treatment method disclosed by the invention is mainly used for removing organic matters and a part of inorganic salt in the wastewater by means of reduced pressure concentration and low-temperature crystallization, few in the added chemical agents, simple in wastewater treatment process and low in cost; according to the wastewater treatment method disclosed by the invention, the discharge of organic matters is reduced, environmental pollution is reduced, and a part of raw materials is recovered, thus contributing to reduction for production cost.