At present, there are about 400 antibiotic production enterprises in China. The wastewater produced during the antibiotic production process has the following characteristics: complex organic components with high chroma, high toxicity, and high toxicity. This type of wastewater treatment is difficult.

It is difficult to directly treat such wastewater, and pretreatment is generally used before biochemical treatment. The pretreatment methods are mainly physicochemical methods and biological methods. Here, the air floatation method and the flocculation method in the physicochemical method are mainly introduced.

Air floatation method: The air floatation method uses highly dispersed microbubbles as a carrier to adhere the suspended particles in the wastewater, so that the suspended matter with a density lower than that of the water floats up to the surface of the water to realize the separation of the muddy water, which is an efficient and rapid solid-liquid separation. technology. This method has been proved by a large number of practices that the removal of ss in wastewater is about 70%, and the COD removal rate is about 66%. Basically, the second type of emission standards can be achieved.

Flocculation method: flocculation method is a general term for coagulation and flocculation. It is to add a certain amount of coagulant or flocculant to the wastewater, and use the action of adsorption bridge to make the large suspended particles in the wastewater condense into large flocs. Settling to the bottom of the water can also serve the purpose of separating mud and water. This type of method has high efficiency, simple method, low cost and wide application range. The SS, COD and chromaticity removal rates of the anti-fouling wastewater treated by the flocculation method are higher than those of the air flotation method.

Whether using air flotation or flocculation, it is necessary to use coagulants and flocculants. The coagulants or flocculants currently used are mainly PAM, polyaluminum chloride, and sulfates.