Three-stage rotating disc-type sewage treatment device based on biologically active filler

Abstract

The invention discloses a three-stage rotating disc-type sewage treatment device based on biologically active filler, and belongs to the field of treatment of sewage and wastewater. The device comprises an anaerobic hydrolysis acidification tank (1), a nitrification tank (2), a denitrification tank (3) and a sedimentation tank (4) which are sequentially connected, wherein disc cage-type structuresare arranged in the first three tanks, cages are filled with the biologically active filler so as to form cage-type biological turntables with different performance, and rotation is performed by theturntables in the separate reaction tanks under the drive of a driving system; one half of the nitrification biological turntable of the aerobic tank which is the nitrification tank is immersed in water, the other half is exposed to the air, and oxygenation and stirring of the water are achieved through rotation; and the turntables in the denitrification tank and the anaerobic hydrolysis tank areall immersed in water, and the water is stirred through rotation. A chemical mixing stirring device is arranged in the denitrification tank, and meanwhile a chemical phosphorus removal reaction and phosphorus removal in the flocculation process are realized by means of the rotary stirring function of the denitrification biological turntable in the denitrification reaction tank.

Description

technical field [0001] The invention belongs to the field of sewage and wastewater treatment, in particular to a three-stage turntable sewage treatment device based on biologically active fillers. Background technique [0002] At present, the technology used in the field of sewage and wastewater treatment is mostly activated sludge method. The core material of this type of method is the biologically active sludge in the treatment system, and the bacteria in it can be roughly divided into organic matter degradation bacteria and nitrifying bacteria according to their performance. , denitrifying bacteria, phosphorus removal bacteria four categories. The activated sludge treatment in the current operation belongs to the single sludge system. The various types of bacteria mentioned above are mixed in the activated sludge. The main treatment process is to complete the removal of three major types of pollutants (C, N, P), and finally to separate the mud and water through the sedim...

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Problems solved by technology

[0006] 1. Insufficient organic matter in denitrification: In the traditional activated sludge method, the aerobic treatment process section has strong ability to compete for dissolved oxygen due to the coexistence of organic matter degrading bacteria and nitrifying bacteria.

In addition, in the nitrification process, the generation cycle of nitrifying bacteria is longer than that of other bacteria in activated sludge. In order to ensure the growth and reproduction of nitrifying bacteria in process design, the sludge age is generally considered to be at least 3 days. However, the number of nitrifying bacteria The proportion in the whole sludge system is still very small (the oxidation efficiency of ammonia nitrogen in urban sewage treatment plants is only 15-20mg / L), in order to ensure the effluent ammonia nitrogen index, the aerobic treatment time of urban sewage treatment plants should be kept at least 6 Hours or more, and some other waste water may even take several days

Under this working condition, the load of organic matter and ammonia nitrogen in sewage treatment is very low. Too low load leads to sludge expansion in high temperature and low temperature seasons in summer. Sludge expansion leads to sludge floating and a large amount of sludge loss in sedimentation tanks. Water quality deterioration

[0007] 2. The problem of complex oxygen supply in the system: In order to achieve a good oxygen supply in large sewage treatment plants, it is necessary to equip complex air supply systems for aerobic pools. Good management and maintenance, too high dissolved oxygen will consume activated sludge, too low will lead to insufficient dissolved oxygen, if you want to achieve a rational state, you need to be equipped with a complex control system (dissolved oxygen probe, PLC control unit, fan system, etc.)

[0008] 3. The problem of stable phosphorus removal: In the process of biological phosphorus removal by activated sludge method, after the phosphorus-accumulating bacteria pass through the anaerobic and aerobic process stages, the phosphorus-accepting bacteria ingest excessive phosphorus, and at this time, the system can be guaranteed as soon as possible. The system has a good phosphorus removal effect. However, in order to ensure the longer sludge age requirement of nitrifying bacteria in the single sludge system, the phosphorus-uptake bacteria stay in the sedimentation tank for too long, and the sludge forms anoxic state in the sedimentation tank. , the phosphorus in the cells of many phosphorus-accepting bacteria will be released, which will lead to the deterioration of the biological phosphorus removal effect. Therefore, in a small treatment system, if it is to maintain a stable biological phosphorus removal, the management is more complicated

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