Excessive phosphorus pollution causes eutrophication to become more serious, and bloom and tide occur from time to time and become more and more serious. Eutrophication has endangered many industries such as agriculture, fishing, and tourism, and has also posed a huge threat to food health and product safety. Phosphorus is one of the pollutants that cause eutrophication, and the emission of phosphorus-containing waste has increased rapidly with the rapid growth of the production and consumption of phosphorus-containing detergents and the development of phosphating technology. The waste phosphorus removal process is mainly divided into physicochemical phosphorus removal method and physical phosphorus removal technology. Details are as follows:
Physicochemical phosphorus removal methods are mainly divided into the following types:
1. Chemical coagulation and precipitation method: the salts of certain genera that are easy to dissolve are put into the genus ion, and the genus is separated from the body by reacting with phosphorus to remove the phosphorus.
2. Ionization exchange method: the porous yin exchange resin is used to selectively absorb and remove phosphorus from pollution. However, resin drugs are easy to be poisoned, have low exchange capacity and poor selectivity, etc., because this method is difficult to obtain practical application.
3. Phosphorus removal by crystallization method: the crystallization phenomenon of phosphate ionization and calcium ionization and hydroxide ionization in pollution to form basic calcium phosphate (hydroxycalcium apatite) a(OH) (PO4)3].
The phosphorus removal technology is mainly divided into the following types:
1) A o art: It is the most basic phosphorus removal art, and the A section of the advanced A o method of microorganisms is in an anaerobic environment, and the polyphosphate accumulated in the body will be released into the body. Then enter the O section of the A O method, which is in an aerobic environment, where the micromatter is synthesized and polyphosphate accumulates in the body.
2）a⊃2;o: It is to add an anoxic stage on the basis of the ao process, so that the mixed liquid in the aerobic zone can be refluxed into the anoxic zone to denitrify and denitrify, so that the denitrification of phosphorus is combined.
3) Phostrip art: the combination of physical method and chemical phosphorus removal, part of the reflux sludge (about 10% of the inflow rate 20%) is diverted to the anaerobic tank for phosphorus removal, the sludge usually stays in the anaerobic tank for 8 10h, and the phosphorus bacteria release phosphorus in the anaerobic tank, and the dephosphorized sludge flows back to the exposure tank to continue to absorb phosphorus. The phosphorus-containing supernatant is fed into a chemical sedimentation tank and the ash is added to form a precipitate.
4) Oxidation ditch art: Due to its special operation, oxidation ditch art has formed alternating changes of anoxic and aerobic in space, and has achieved nitrification, denitrification and material sterilization.
These waste phosphorus removal processes have a definite effect on phosphorus treatment, but due to the fluctuation of quantity, etc., the effect is unstable, so it is necessary to add a chemical treatment agent - phosphorus removal agent treatment. The phosphorus removal agent has the characteristics of adding stool and excellent treatment effect, and is suitable for adding after pretreatment.
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