There are many ways to treat industrial phosphoric acid waste, and the following are some commonly used treatment methods:

1. Chemical precipitation method: adding an appropriate amount of chemical coagulant to the industrial phosphoric acid waste liquid, so that the suspended solids and colloidal substances are condensed into large particles, and then removed by precipitation, filtration and other methods.
2. Activated carbon adsorption method: using the adsorption performance of activated carbon, the organic matter and pigment in industrial phosphoric acid waste liquid are adsorbed on the surface of activated carbon to achieve the purpose of purifying the waste liquid.
3. Biological treatment method: the metabolism of microorganisms is used to decompose the organic matter in industrial phosphoric acid waste liquid into simple inorganic substances, such as carbon dioxide, water, etc. Biological treatment methods can be divided into anaerobic biological treatment and aerobic biological treatment.
4. Oxidation-reduction method: the use of oxidants or reductants to industrial phosphoric acid waste liquid in the organic oxidation or reduction reaction, so that it is converted into harmless substances or easy to handle substances.
5. Evaporation concentration method: for the low concentration of industrial phosphoric acid waste liquid, evaporation concentration method can be used to evaporate the water in the waste liquid, leaving phosphate and other useful substances.
6. Activated sludge method: the industrial phosphoric acid waste liquid is added to the activated sludge, and the organic matter and nutrient salt in the waste liquid are removed by the adsorption and oxidation of the activated sludge.

The above methods can be selected and used according to actual conditions, and can also be used in combination according to needs. When treating industrial phosphoric acid waste liquid, relevant laws, regulations and standards should be followed to ensure that the treatment effect meets environmental protection requirements. At the same time, safety issues should be paid attention to to avoid harm to operators and the environment.