Integrated treatment equipment for rural aquaculture sewage with high-concentration COD (Chemical Oxygen Demand) and ammonia nitrogen

[0025] Example 1

[0026] like figure 1 , figure 2 As shown in the figure, an integrated treatment equipment for rural high-concentration COD and ammonia nitrogen aquaculture sewage of the present invention includes a UASB reactor 1, an anoxic tank 2, an aerobic tank 3, an activated carbon filler tank 4, an MBR reaction tank 5 and a disinfection tank connected in sequence. Pool 6, a reaction zone 7 is provided inside the UASB reactor 1, a water storage zone 8 is provided outside the reaction zone 7, a sludge settling zone 71 is provided at the lower part of the reaction zone 7, and suspended sludge is provided above the sludge settling zone 71 Zone 72, a separation zone 73 is provided above the suspended sludge zone 72, a three-phase separator 731 is provided on the upper part of the separation zone 73, and overflow weirs 732 communicated with the water storage zone 8 are provided on both sides of the separation zone 73. The UASB reactor The lower part of 1 is provided with a sewage inlet 9 which communicates with the sewage input pipeline 10 leading into the reaction zone 7 , and the upper part of the UASB reactor 1 is provided with a first water outlet 11 which communicates with the anoxic tank 2 . UASB Reactor 1 is designed for the difficult biochemical properties and high COD of rural sewage. UASB Reactor 1 can remove part of COD while improving the biochemical properties of sewage, reducing the treatment pressure of subsequent pools.

[0027] Anoxic tank 2 is provided with a first filler 12, and the lower part of anoxic tank 2 is provided with a second water outlet 13 communicated with aerobic tank 3; aerobic tank 3 is provided with second filler 14, The bottom is provided with a first aerator 15, the first aerator 15 communicates with the first aeration fan 16, and a first flow meter 17 and a first aerator 17 are arranged between the first aerator 15 and the first aeration fan 16 in sequence A regulating valve 18, the upper part of the aerobic pool 3 is provided with a third water outlet 19 which communicates with the activated carbon packing pool 4. The anoxic tank 2 and the aerobic tank 3 are designed for high ammonia nitrogen and high total nitrogen. The treated water enters the anoxic tank 2 for denitrification and denitrification, and then enters the aerobic tank 3 for aeration to remove part of COD and ammonia nitrogen.

[0028]The activated carbon packing pool 4 is provided with activated carbon particles 20, and the bottom of the activated carbon packing pool 4 is provided with a second aerator 21, the second aerator 21 is communicated with the second aeration fan 22, and the second aerator 21 is connected with the second aerator 21. A second flow meter 23 and a second regulating valve 24 are arranged between the aeration fans 22 in sequence, and a fourth water outlet 25 communicated with the MBR reaction pool 5 is arranged at the lower part of the activated carbon packing pool 4 . The activated carbon filler pool 4 is designed for the odor of rural aquaculture sewage and the long growth and metabolism cycle of nitrifying bacteria, and the low efficiency of removing ammonia nitrogen. The water treated by the aerobic pool 3 enters the activated carbon filler pool 4 for nitrification and adsorption deodorization. Effectively increase the biomass of nitrifying bacteria, improve the efficiency of nitrifying bacteria to convert ammonia nitrogen, and effectively solve the problem of high ammonia nitrogen removal in rural aquaculture sewage.

[0029] An MBR membrane system 26 is arranged inside the MBR reaction tank 5 , and a fifth water outlet 27 communicated with the disinfection tank 6 is arranged on the upper part of the MBR reaction tank 5 . The MBR reaction tank 5 is designed to remove suspended SS and part of COD in the effluent. The treated water treated by the activated carbon filler tank 4 then enters the MBR reaction tank 5 for filtration and sedimentation and removes the remaining part of COD and total nitrogen.

[0030] The top of the disinfection tank 6 is provided with a medicine storage tank 28 , a medicine liquid flow meter 29 and a medicine liquid control valve 30 are arranged between the medicine storage tank 28 and the disinfection tank 6 in sequence, and a treated water outlet 31 is arranged at the bottom of the disinfection tank 6 . The disinfection tank 6 is designed to kill the pathogenic microorganisms in the sewage before the treated water is discharged into the environment, so as to improve the sewage treatment effect.

[0031] At least two three-phase separators 731 are provided, and two three-phase separators 731 are provided in this embodiment.

[0032] The first aerator 15 and the second aerator 21 are both rubber microporous aerators.

[0033] The first aeration fan 16 and the second aeration fan 22 are both three-lobed Roots fans.

[0034] Example 2

[0035] The technological process of embodiment 1 is as follows:

[0036] According to the embodiment of Example 1, the specific implementation process of the present invention: the sewage first enters the UASB reactor 1. In the UASB reactor 1, about 60% of the COD is removed, and the macromolecular organic matter that is difficult to degrade is decomposed into simple molecular structures. , molecular structure with better biochemical properties, in UASB reactor 1, the residence time of sewage is about 16 hours, the generated methane (CH4) gas overflows through the three-phase separator 731, the generated sludge sinks, and the initial treatment The last sewage is discharged through the overflow weir 732 and enters the anoxic tank 2; the anoxic tank 2 is equipped with a first filler 12, and the first filler 12 provides a place for the growth of microorganisms. Biomass and sewage undergo partial COD removal and denitrification and denitrification in anoxic tank 2. The treated water in anoxic tank 2 then enters into aerobic tank 3, where organic pollutants in sewage are further treated in aerobic tank 3. Decomposition, ammonia reaction and nitrification reaction occur at the same time, so that the ammonia nitrogen in the sewage is removed in the aerobic tank 3; the treated water in the aerobic tank 3 enters the activated carbon packing tank 4, and the activated carbon particles 20 have a huge surface area, and also It can provide a huge inner pore area, providing sufficient attachment sites for bacteria, especially nitrifying bacteria, and the inner pore channel also provides an anoxic and anaerobic environment, which is conducive to the growth of anoxic and anaerobic microorganisms, and further reduces the pollution in sewage. COD, ammonia nitrogen and total nitrogen, so that the effluent quality basically meets the discharge standard; the water treated by the activated carbon packing pool 4 enters the MBR reaction pool 5, and the MBR membrane system 26 is installed in the MBR reaction pool 5. The treated water of the filler tank 4 is filtered, and the suspended solids (SS) in the treated water are filtered; the water treated by the MBR reaction tank 5 enters the disinfection tank 6, and chlorine dioxide is added to the disinfection tank 6 through the medicine storage tank 28. The treated water is further sterilized and disinfected to kill pathogenic microorganisms in the water, and finally discharges up to the standard.

[0037] Example 3

[0038] In embodiment 2, the effect of aquaculture sewage treatment is as follows:

[0039] Sewage treatment plan:

[0040] The treated water volume is 20 tons/day, the influent water quality is shown in Table 1, and the effluent quality is shown in Table 2.

[0041] Table 1 Influent water quality indicators

[0042] Monitoring items

[0043] Table 2 Effluent water quality indicators

[0044] Test items

[0045] It can be seen from the data in Table 1 and Table 2 that the water quality of the treated water after treatment by the integrated treatment equipment for high-concentration COD and ammonia-nitrogen aquaculture sewage in the present invention conforms to one of GB18918-2002 "Pollutant Discharge Standards for Urban Sewage Treatment Plants". Grade A standard.

[0046] The invention is an integrated treatment equipment for rural high-concentration COD and ammonia nitrogen aquaculture sewage, which is designed for the water quality characteristics of high COD, high ammonia nitrogen, high total nitrogen and poor biochemical properties of rural aquaculture sewage. Odor-MBR membrane-disinfection is organically combined to treat rural high-concentration COD and high ammonia nitrogen sewage, which has the characteristics of low cost and good effect. The invention has strong pertinence and feasibility. After the rural aquaculture sewage is treated, the quality of the treated water can reach GB18918-2002 "Pollutant Discharge Standards for Urban Sewage Treatment Plants"; The gas generated by the device can also be reused, the operation cost is low, and the sewage treatment effect is good.