The wastewater treatment methods can be divided into the following types:

Physical method: precipitation, floating, centrifugation, filtration, etc.;

Chemical method: pH adjustment method (neutralization method), coacervation method, chemical oxidation method, chemical reduction method, adsorption method, precipitation method, ion exchange method, organic solvent extraction method, biochemical method, etc.;

Physical Chemistry: It is a physical function based on chemical methods, which can be adsorbed, precipitated, aerated, irradiated, ultraviolet, high temperature, high pressure, and high-speed rotation. Such as the natural degradation method, that is, relying on the role of the natural environment to store the wastewater, the daily exposure to light, the wind, the flow, etc., so that the concentration of many pollutants including cyanide has decreased, to reduce or eliminate Some harmful impurities. Another example is the addition of cyanide hydrolysis pressure, i.e. the container exert a certain pressure and temperature white spoon white spoon in a particular reaction, and adjusting pH value suitable white spoon, so cyanide decomposed into ammonia and formate heavy metal cyanide oxide Become a non-toxic or low-toxic substance.

In actual work, wastewater treatment is often a comprehensive application of several methods. It is usually divided into three levels. The first step is to use a simple physical, chemical and physical chemical method to purify the water, and the second step is to use a biochemical method. Among them, there are biological oxidation, biological reduction, etc., generally can remove about 90% of degradable organic matter and solid suspended matter, but biochemical methods are difficult to remove certain heavy metal poisons and high carbon compounds. In order to ensure the qualified water quality, further physical and chemical methods can be used for further treatment.

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