CN205419926U - Low energy consumption enhanced nitrogen removal phosphorus removal device - Google Patents

Abstract

The utility model relates to a low energy consumption enhanced denitrification and dephosphorization device, which is characterized in that it comprises a methane-producing anaerobic reactor, a dissimilation iron reduction reactor, anaerobic ammonium oxidation reactor and an aerated biological filter. Next, each reactor performs main removal of organic matter, phosphorus and nitrogen in turn, and finally the biological aerated filter is oxygenated to further ensure the quality of the effluent. The beneficial effect is that the pollutants are mainly removed in an anaerobic environment, and the energy consumption is low; for organic matter, nitrogen and phosphorus, there are corresponding reactors for targeted removal, and the removal effect is good.

Description

A low energy consumption enhanced nitrogen and phosphorus removal device

technical field

The utility model relates to the enhanced nitrogen and phosphorus removal in the field of environmental engineering water treatment, in particular to a low energy consumption enhanced nitrogen and phosphorus removal device.

Background technique

Nitrogen and phosphorus are the main elements that cause eutrophication of water bodies. The most widely used nitrogen and phosphorus removal process is the anaerobic/anoxic/aerobic process (A/A/O process). Backflow, backflow in the nitrifying liquid and the need for a large amount of aeration, high energy consumption, and because the sludge age requirements of the phosphorus accumulating bacteria required for phosphorus removal and the nitrifying bacteria required for denitrification cannot be met at the same time, it is difficult to achieve good denitrification at the same time phosphorus removal effect.

Considering low energy consumption, the anaerobic process does not require aeration, which can save energy consumption. In the anaerobic process, hydrolytic acidification-methanization can remove organic matter; dissimilatory iron reduction can improve the degradation efficiency of the sewage treatment system for refractory organic matter on the one hand, and on the other hand can utilize the ferric and ferrous iron dissolved in the reactor , and the precipitation of phosphate improves the phosphorus removal effect of the sewage treatment system; and in the environment of low organic matter, anaerobic ammonium oxidation has a strong denitrification effect; the dissolved oxygen concentration in the anaerobic effluent is zero or very small, so it cannot be directly Emission requires aeration and oxygenation, and the biological aerated filter is used to oxygenate the anaerobic effluent. At the same time, the biological aerated filter can simultaneously remove organic matter, nitrogen and phosphorus, and further ensure the quality of the effluent. The combination of the above several processes removes most of the organic matter in the anaerobic stage, and when it reaches the biological aerated filter, the load is small and the oxygen consumption is small, which can provide the possibility of nitrogen and phosphorus removal with low energy consumption.

Contents of the invention

In order to strengthen nitrogen and phosphorus removal while reducing energy consumption, the utility model adopts a low energy consumption enhanced nitrogen and phosphorus removal device, which can realize effective nitrogen and phosphorus removal under low energy consumption.

The technical solution adopted in the utility model is: a low energy consumption enhanced nitrogen and phosphorus removal device includes a methane-producing anaerobic reactor, a dissimilation iron reduction reactor, anaerobic ammonium oxidation reactor and an aerated biological filter, and a methane-producing anaerobic reactor The water outlet of the oxygen reactor is connected to the water inlet of the dissimilation iron reduction reactor, the water outlet of the dissimilation iron reduction reactor is connected to the water inlet of the anammox reactor, and the water outlet of the anammox reactor is connected to the biological aerated filter water intake.

The methanogenic anaerobic reactor and the anammox reactor are upflow anaerobic sludge bed reactors with a three-phase separator, and the middle part of the dissimilated iron reduction reactor has a quarter to a third The reactor height is thick with ferric iron packing layer.

Among them, the methanogenic anaerobic reactor is mainly used for the removal of most of the organic matter and the conversion of organic nitrogen to ammonia nitrogen; the dissimilation iron reduction reactor is mainly used for chemical phosphorus removal, while further removing organic matter, increasing the oxidation-reduction potential and providing iron, for Anaerobic ammonium oxidation provides suitable conditions; anaerobic ammonium oxidation reactor is mainly used for denitrification; biological aerated filter is used to ensure sufficient dissolved oxygen in the effluent, while further ensuring that the effluent meets the standard.

The beneficial effects are as follows: (1) Pollutants are mainly removed in an anaerobic environment, saving energy; (2) For organic matter, nitrogen and phosphorus, there are corresponding reactors for targeted removal, and the removal effect is good.

Description of drawings

Figure 1 is an overall schematic diagram of a device for enhanced nitrogen and phosphorus removal with low energy consumption.

In the figure: 1. Methanogenic anaerobic reactor, 2. Methane exhaust port, 3. Methanogenic anaerobic reactor three-phase separator, 4. Methanogenic anaerobic reactor water inlet, 5. Methanogenic anaerobic reaction 6. Dissimilation iron reduction reactor, 7. Dissimilation iron reduction reactor water inlet, 8. Ferric iron packing, 9. Dissimilation iron reduction reactor outlet, 10. Anammox reactor, 11. Nitrogen exhaust port, 12. Three-phase separator of anammox reactor, 13. water inlet of anammox reactor, 14. outlet of anammox reactor, 15. connecting pipeline, 16. aeration Biological filter, 17. Biological aerated filter water outlet, 18. Hanging film filler, 19. Aeration pipe, 20. Biological aerated filter water inlet.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

Sewage or waste water containing nitrogen and phosphorus first enters the anaerobic reactor 1 through the water inlet 4 of the anaerobic reactor for methane generation, and undergoes hydrolysis and acidification of the anaerobic sludge and methane generation, so that macromolecular organic matter becomes small molecules Most of the organic matter is removed, and it is discharged from the methane exhaust port 2 in the form of methane. At the same time, the organic nitrogen is converted into ammonia nitrogen, and it is separated by the three-phase separator 3 of the methanogenic anaerobic reactor. The treated sewage or waste water is passed through The water inlet 7 of the dissimilation iron reduction reactor enters the dissimilation iron reduction reactor 6, and the dissimilation iron reduction bacteria inside use the ferric ions produced by the ferric filler 8 to perform dissimilation iron reduction to remove some organic matter, including refractory organic matter, and three The valence iron ions and the reduction product divalent iron ions will react with phosphate to produce precipitation for chemical phosphorus removal, and after the reduction of ferric iron, the redox potential of the system will increase, which is beneficial to the subsequent anammox reactor Growth of anammox bacteria in 10. After being treated by the sewage dissimilation iron reduction reactor 6, the quality of sewage or waste water further changes, the concentration of organic matter decreases and contains divalent and ferric ions, which are discharged through the water outlet 9 of the dissimilation iron reduction reactor, and are discharged by the anaerobic ammonium oxidation reactor The water inlet 13 enters the anammox reactor 10. At this time, the concentration of organic matter in the water is low, which has little influence on the autotrophic anammox bacteria, and the water contains divalent and ferric iron, which helps the anammox bacteria growth. After being treated by the anammox bacteria in the anammox reactor 10 , a large amount of nitrogen in the sewage is removed, and the nitrogen gas produced is discharged through the nitrogen exhaust port 11 . At this time, the concentration of organic matter, nitrogen and phosphorus in the water is basically up to the standard. In order to ensure the quality of the effluent, and considering that the anaerobic effluent cannot be discharged directly, it needs to be aerated and oxygenated. A biological aerated filter 16 is added at the end of the device, and the effluent of the anammox reactor 10 enters the biological aerated filter 16 by the biological aerated filter inlet 20 through the outlet of the anammox reactor, because the film The presence of biofilm on the filler 18 can simultaneously remove organic matter, nitrogen and phosphorus under the condition of oxygenation in the aeration tube 19, and at the same time increase the concentration of dissolved oxygen in the water to make it discharge up to the standard. During the whole operation process, the mutual cooperation of each stage can achieve good organic matter degradation and nitrogen and phosphorus removal.

Claims (2)

1. A kind of low energy consumption strengthens denitrification and dephosphorization device, it is characterized in that comprising the production of methane anaerobic reactor, dissimilation iron reduction reactor, anaerobic ammonium oxidation reactor and biological aerated filter, the production of methane anaerobic reactor The water outlet is connected to the water inlet of the dissimilation iron reduction reactor, the water outlet of the dissimilation iron reduction reactor is connected to the water inlet of the anaerobic ammonium oxidation reactor, and the water outlet of the anaerobic ammonium oxidation reactor is connected to the water inlet of the biological aerated filter. 2. A kind of low energy consumption strengthened denitrification and dephosphorization device according to claim 1, characterized in that the anaerobic reactor for the production of methane and the anammox reactor are upflow anaerobic sludge bed reactors, There is a three-phase separator, and the middle part of the dissimilated iron reduction reactor has a ferric iron packing layer thicker than one quarter to one third of the reactor height.