Synchronous denitrification and dephosphorization sewage treatment device for immobilized microorganism CASS (cyclic activated sludge system)

[0025] The present invention will be further described below in conjunction with the description of the drawings and specific implementations:

[0026] Such as figure 1 with 2 The shown one kind of immobilized microorganism CASS synchronous denitrification and dephosphorization sewage treatment device includes a pool body 1, an inlet pipe 2 is arranged on one end of the pool body 1, and the other end of the pool body 1 is arranged The outlet pipe 3 is provided with a hollow grid reaction box 4 in the pool body 1, and an immobilized microbial carrier 5 is arranged in the hollow grid reaction box 4, and is provided on the bottom of the pool body 1. There are aeration devices6.

[0027] Such as figure 2 As shown, the hollow grid reaction box 4 of the present invention includes multiple grid plates 41, which are connected in turn to form a box body 42, on which an upper cover is hinged. An accommodating space is provided in the box 42 and the immobilized microorganism carrier 5 is arranged in the accommodating space.

[0028] The grid plate 41 described in the present invention is composed of a plurality of crisscross ribs 43, and the mesh size is 1.0-2.0 cm. The rib 43 is made of rigid polyethylene or polypropylene plastic. The immobilized microbial carrier 5 is confined to the hollow grid reaction box 4 to form a floating filter layer. The hollow grid reaction box 4 is a cuboid or cube with a volume of 1.0-1.5 cubic meters, which is convenient for installation, replacement and maintenance. The grid size is based on The size of the immobilized microbial carrier is adjustable, and the nanocomposite polyurethane carrier is confined in the grid box. The nanocomposite polyurethane carrier is a cube with a size of 2.0-3.0cm. The grid size of the hollow grid reaction box is 1.0-2.0cm. The carrier is evenly distributed in the grid box, so that the microbial immobilized carrier is evenly distributed in the tank.

[0029] The immobilized microbial carrier 5 described in the present invention is a macroporous mesh carrier. The filling rate of the immobilized microorganism carrier 5 in the hollow grid reaction box 4 is 30-50%. The said macroporous network carrier is nano composite polyurethane foam. The said nano composite polyurethane foam is a cube with a size of 8.0cm 3 -27.0cm 3.

[0030] The aeration device 6 in the present invention includes an aeration pipe arranged in the bottom of the tank body, and a plurality of aeration heads 61 are provided on the aeration pipe. The aeration head 61 is an aeration nozzle or an aeration tube.

[0031] figure 1 It is a schematic diagram of the immobilized microorganism CASS simultaneous denitrification and dephosphorization sewage treatment device. The tank body 1 is square or round, with water at the bottom, and an aeration device 6 at the bottom of the tank. Point-line compensation aeration is used to provide the biochemical reaction. Oxygen keeps the immobilized microbial carrier in a floating state and prevents the formation of biofilm from clogging. Staggered brackets are arranged on the upper part of the aeration pipe for placing the hollow grid reaction boxes 4, which are staggered to each other and fill the entire pool body. The number and size of the hollow grid reaction box 4 can be adjusted according to the size of the pool body. The entire tank body is composed of dozens of floating bioreactors. In each reactor, anaerobic, anoxic, and aerobic microenvironments can be formed according to the pore structure of the carrier, which is beneficial to the simultaneous nitrification and denitrification reactions, and the microorganisms are loaded. The amount is large, the immobilized microorganism carrier is in a floating state, the microorganisms are updated quickly, and the biochemical reaction efficiency is high. The immobilized microorganism greatly improves the tolerance and greatly improves the treatment effect. The whole tank body is simple in structure, easy to repair and replace. You only need to take the reaction box out of the tank with a crane. After the replacement, it can be directly placed in the tank, which is convenient for maintenance. It can be especially applied to the transformation of traditional biochemical tanks to improve the treatment effect.

[0032] When used in the patent of the present invention, the urban sewage enters the tank 1 continuously through the water inlet pipe 2, and aeration while entering the water, so that the organic pollutants are oxidized and decomposed by microorganisms. At the same time, the ammonia nitrogen in the sewage is also nitrified by the microorganisms. Converted into nitrate nitrogen. After the aeration is stopped, the water is continued to enter, and the microorganisms use the remaining dissolved oxygen in the water for oxidative decomposition. As the dissolved oxygen content decreases, the aerobic state gradually changes to anoxic, and a certain degree of denitrification occurs. Because the microorganisms are immobilized, even if the water is not stopped at this stage, a good precipitation effect can still be obtained. After the precipitation stage is completed, the water outlet pipe 3 is opened to discharge the supernatant. After the drainage is over, the next cycle repeating process can be entered.

[0033] When the immobilized microorganism CASS simultaneous denitrification and dephosphorization sewage treatment device is operated in actual domestic sewage treatment operation, the test results show that the COD is 368mg/L, NH 4 + -N is 65mg/L, TN is 92mg/L, SS is 365mg/L, total phosphorus is 5.8mg/L domestic sewage, the whole biochemical reaction time is 6.0-8.0h, the reactor effluent COD is 35mg/L, NH 4 + -N is 0.11mg/L, SS is 16.0mg/L, TN is 11mg/L, total phosphorus is 0.45mg/L, COD removal rate can reach 90% in total, NH 4 + -N is 99.8%, SS is 95%, total phosphorus is 92%, and the final effluent water quality fully meets the "Urban Wastewater Treatment Plant Pollutant Discharge Standard" GB18918-2002 Class A standard.