brief introduction

        Organic wastewater in solution has the following characteristics: first, high concentration of organic matter. Cod is generally more than 2 000 mg / L, some even as high as tens of thousands or even hundreds of thousands of mg / L. relatively speaking, BOD is low, and the ratio of BOD to COD in many wastewater is less than 0.3. Second, the composition is complex. Most of the organic compounds in the wastewater containing toxic substances are aromatic compounds and heterocyclic compounds, as well as sulfides, nitrides, heavy metals and toxic organic compounds. Third, high chroma and peculiar smell. Some waste water emits a pungent odor, causing adverse effects on the surrounding environment. Fourth, it has strong acid and strong base.

Related process

        MVR evaporator is used to pretreat the wastewater, recover the waste salt, and reuse the condensate water or enter the biochemical system for advanced treatment. MVR evaporator treatment process: the pharmaceutical industrial wastewater heated and concentrated by the preheater is introduced into the MVR evaporator by a pump. In the heat exchanger, the pharmaceutical industrial wastewater is cyclically heated, evaporated and concentrated by steam, and the distilled water is returned to the preheater for preheating the stock solution; The obtained concentrated liquid and steam enter into the liquid gas separator. Through the liquid gas separator, the separated steam enters into the compressor, and the separated concentrated liquid is directly returned to the collection tank. The useful substances can be recovered by treating the concentrated liquid; When the saturated concentrate treated by MVR evaporation meets certain conditions (saturation, viscosity, etc.), the PLC control system will send a command to the solid-liquid separator, the valve will open automatically, and the concentrate will flow into the mold. The saturated concentrated liquid is treated by crystallizer to separate solid from liquid.

        Finally, by recycling the compressed, heated and pressurized secondary steam, the useful substances in pharmaceutical industrial wastewater can be recycled and "zero discharge" of pharmaceutical industrial wastewater can be realized.