CN111908734A - AB process operation method based on anaerobic ammonia oxidation - Google Patents

Abstract

The invention discloses an AB process operation method based on anammox. On the basis of the AB process, after the dissolved oxygen in the B-stage reactor is controlled to be 0.3-0.6 mg/L, anammox bacteria are added to the B-stage reactor. In the A-stage reactor, there are functional microorganisms with strong adaptability screened out by sewage washing, which can adsorb and flocculate and settle organic matter. The operation process of this stage is: water intake-adsorption-settling-drainage, and the maximum adsorption is reached after 30 minutes. In order to reduce the influence of organic matter for the B-stage reactor; there are anammox bacteria, denitrifying bacteria and nitrifying bacteria in the B-stage reactor. The reaction of these microorganisms can realize the denitrification of sewage. The operation process of this stage is: Water - Reaction - Settlement - Drainage. The invention has good denitrification performance, the A-stage reactor reduces the organic matter content in the sewage, the advantages of the anaerobic ammonium oxidation reaction in the B-stage reactor can be fully exerted, and the low denitrification efficiency of the AB process is effectively solved. The problem.

Description

A kind of AB process operation method based on anammox

technical field

The invention belongs to the technical field of anaerobic ammonium oxidation for environmental engineering sewage treatment, and in particular relates to an AB (Adsorption-Biodegradation) process operation method based on anaerobic ammonium oxidation.

Background technique

At present, due to the substandard discharge of sewage and the problem of eutrophication of water bodies, the problem of water environment pollution is becoming more and more serious. Sewage treatment has become an important strategic goal of national economic development, and denitrification has become the focus of sewage treatment. In the sewage treatment process, the AB process is the old sewage treatment process in my country. Compared with the traditional activated sludge process, the AB process has the advantages of small volume, simple sewage treatment equipment, unique microorganisms that can meet the requirements of each stage, anti-shock load, and anti-toxicity. The advantages of strong ability and so on. The AB process is divided into A section (adsorption section) and B section (biodegradation section). The urban sewage flows directly into the A section from the drainage pipe network through the grille and the grit chamber, and flows into the A section through the flocculation and adsorption of the biological sludge. Segment B is biodegraded. However, because the AB process mainly deals with organic matter in sewage, it cannot meet the requirements of denitrification, so it is gradually eliminated. For the new denitrification process, the anammox process has the advantages of no additional carbon source material, high load, and low excess sludge yield, and has broad application prospects in the field of sewage denitrification. However, the anammox process also has certain drawbacks. If there is organic matter in the sewage, it will interfere with the anammox process. Therefore, combining the advantages of the two processes, considering that the AB process can reduce the concentration of organic matter in the sewage, the anaerobic ammonia oxidation process can be used for denitrification. This operation mode can improve the effluent quality and reduce the excess sludge production, so that the two processes Play a greater advantage in the field of sewage treatment.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the problems existing in the AB process and the anammox process, combine the advantages of the two, improve the limitations of a single process, and provide an AB process operation method based on anammox, which The method can improve the denitrification efficiency.

The specific steps are:

A reaction device with AB process coupled with anaerobic ammonium oxidation is set up, and the device includes a water inlet bucket, an A-stage reactor, a primary sedimentation tank, a B-stage reactor and a secondary sedimentation tank; the A-stage reactor is provided with an aeration system for the purpose of Microorganisms provide sufficient dissolved oxygen to give full play to the role of flocculation and adsorption. The B-stage reactor is equipped with a pH online monitoring and adjustment system, agitator and aeration system; the aeration system includes aeration sand head and blower, and pH online monitoring and adjustment system Contains pH probe and pH online adjustment monitor. In the A-stage reactor, the protobacteria adapted to the sewage are selected after being washed by the sewage. Nitrifying bacteria, denitrifying bacteria and anammox bacteria exist in the B-stage reactor at the same time; The lower part enters, and the organic matter is degraded after flocculation and adsorption in stage A, and the effluent flows into the primary settling tank for precipitation by using the height difference between the reactors. In the B-stage reactor, the mixer in the B-stage reactor continues to stir, and the blower controls the aeration sand head to aerate the reactor. After the sewage and the microorganisms are fully mixed and reacted, they flow into the secondary sedimentation tank for precipitation treatment, and the sludge after precipitation It is pumped into the B-stage reactor through the sludge return pump, and the precipitated water is discharged out of the reactor as the system effluent. The A-stage reactor reaches the maximum adsorption capacity in 30 minutes. After the adsorption is completed, the water is drained to the B-stage reactor. After the B-stage reactor enters the biodegradation reaction stage, it begins to degrade the wastewater that has removed organic matter. When the reaction is over, it settles out of water. In the biodegradation reaction, the dissolved oxygen in the B-stage reactor was controlled to be 0.3-0.6 mg/L, and the pH value was 7.4-7.6. That is, the AB process operation based on anammox is realized.

The beneficial effects of the present invention are:

The invention effectively solves the problem of poor denitrification effect of the AB process through an AB process operation method based on anaerobic ammonia oxidation. Combining the advantages of the two makes the AB process have good denitrification performance, while reducing the amount of aeration, saving energy consumption, reducing operating costs, and reducing the impact of organic carbon sources in wastewater on the anammox process. This improved method can ensure Biomass in the reactor, and make the microorganisms in each stage give full play to their advantageous functions.

Description of drawings

Fig. 1 is a schematic diagram of the reaction device of the AB process coupled with anaerobic ammonium oxidation in the present invention.

Mark in the figure: 1-water inlet bucket; 19-A stage reactor; 20-Primary settling tank; 21-B stage reactor; 22-Secondary settling tank; 2-Inlet water pump; 3-A stage reactor inlet; 4 -Aerated sand head; 5-Blower; 6-Sampling port; 7-A stage reactor water outlet; 8-Primary settling tank water inlet; 9-Primary settling tank water outlet; 10-B stage reactor water inlet; 11 -pH probe; 12-pH online adjustment monitor; 13-mixer; 14-B stage reactor water outlet; 15-Secondary settling tank water inlet; 16-Second settling tank water outlet; 17-B stage reactor sludge return pump; 18-A stage reactor sludge return pump.

Detailed ways

Example:

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further described below with reference to the accompanying drawings.

As shown in Figure 1, it is a schematic diagram of the reaction device of the AB process coupled with anammox in the present invention. The device includes a water inlet bucket 1 , a stage A reactor 19 , a primary settling tank 20 , a stage B reactor 21 and a secondary settling tank 22 . The sewage enters the A-stage reactor 19 through the inlet water pump 2. The A-stage reactor 19 is provided with an aeration sand head 4 and a blower 5, which continuously aerates the A-stage reactor, and is adsorbed and flocculated by microorganisms in the A-stage reactor. After that, it enters the primary settling tank 19 for sludge settling, and the effluent after settling flows into the B-stage reactor water inlet 10 through the natural height difference through the water outlet 9 of the primary settling tank. The B-stage reactor is provided with a pH online monitoring and adjustment system, a mixer 13 and an aeration system. After the microbial reaction, the effluent flows from the B-stage reactor water outlet 14 to the secondary sedimentation tank inlet 15 and enters the secondary sedimentation tank 22. Water comes out after precipitation. The sludge precipitated in the primary settling tank 20 is returned to the A-stage reactor 19, and the sludge precipitated in the secondary settling tank 22 is returned to the B-stage reactor 21. After the above reaction, the AB process based on anammox can be realized. improvement.

The pH on-line monitoring and adjustment system adjusts the pH value of the B-stage reactor 21 by adding lye, so that the pH value is maintained at 7.4-7.6, and each part of the effluent overflows to the next part of the reactor by gravity. The aeration system provides dissolved oxygen for the A-stage reactor 19 and the B-stage reactor 21, so that the dissolved oxygen during the operation of the A-stage reactor is controlled within the range of 1~1.6 mg/L, and the dissolved oxygen during the operation of the B-stage reactor is controlled. In the range of 0.3~0.6 mg/L. Anhydrous sodium sulfite is added in the primary sedimentation tank 20 to reduce the dissolved oxygen in the influent of the B-stage reactor.

The microorganisms in the A-stage reactor 19 are mainly selected from the raw sewage to screen out the species with strong flocculation, adsorption and degradation of organic matter. It has a high degree of COD degradation, so that it can be degraded into BOD substances that are easy to biochemically process. Strong adaptability, resistant to changes in water intake, water quality, pH, etc., and has the ability to resist shock loads. It can not only remove a part of organic substances, but also play a role in regulating and buffering. The biological sludge produced by the A-stage reactor 19 sinks in the primary settling tank 20, and the settled sludge is returned to the A-stage reactor 19, and most of the organic matter is removed from the system in the form of excess sludge. In the A-stage reactor 19, about 40% of the organic matter can be removed by adsorption, flocculation, decomposition and precipitation. The B-stage reactor 21 mainly contains nitrifying bacteria, denitrifying bacteria and anammox microorganisms after adding anammox, and the sewage after the organic matter is removed by the A-stage reactor is conducive to anammox bacteria to play a role , so that the denitrification effect becomes better and the reactor continues to operate stably.

In this embodiment: the operation process of the A-stage reactor is: water inflow-adsorption-settlement-drainage, and the maximum adsorption capacity is reached in 30 min; the operation process of the B-stage reactor is: water inflow-reaction-settlement-drainage.

The anammox-based denitrification method of the present invention combines the advantages of the AB process, improves the quality of the effluent, reduces the organic matter in the sewage, and successfully achieves the purpose of efficient denitrification of the AB process based on the anammox.

The embodiments and basic principles of the present invention are shown and described above, but are not intended to limit the scope of the present invention. Any changes in shape or structure made according to the present invention without departing from the spirit and scope of the present invention should fall within the scope of the claimed invention.

Claims (1)

1. An AB process operation method based on anaerobic ammonia oxidation is characterized by comprising the following specific steps:

setting a reaction device for coupling AB process with anaerobic ammonia oxidation, wherein the reaction device comprises a water inlet barrel, an A section reactor, a primary sedimentation tank, a B section reactor and a secondary sedimentation tank; an aeration system is arranged in the A-section reactor to provide sufficient dissolved oxygen for microorganisms and fully play the role of flocculation adsorption; a pH on-line monitoring and adjusting system, an aeration system and a stirrer are arranged in the section B reactor, wherein the aeration system comprises an aeration sand head and an air blower, dissolved oxygen is provided for the section A reactor and the section B reactor through the aeration system, the dissolved oxygen during the operation of the section A reactor is controlled to be 1-1.6 mg/L, and the dissolved oxygen during the operation of the section B reactor is controlled to be 0.3-0.6 mg/L; the pH on-line monitoring and adjusting system comprises a pH probe and a pH on-line adjusting monitor, and the pH value in the B-section reactor is kept between 7.4 and 7.6 through the pH on-line monitoring and adjusting system; the effluent water of each stage flows into the reactor of the next stage through the height difference existing between the reactors; the pH on-line detection and adjustment system automatically adds alkali liquor to keep the pH value in the B section reactor stable, the aeration system provides dissolved oxygen for the A section reactor and the B section reactor, the stirrer enables microorganisms to be fully mixed with sewage, and nitrifying bacteria, denitrifying bacteria and anaerobic ammonium oxidation bacteria simultaneously exist in the B section reactor; the operation process of the A-stage reactor is as follows: water inlet, adsorption, sedimentation and water discharge, wherein the maximum adsorption capacity is reached in 30 min; the operation process of the B-stage reactor is as follows: water inlet, reaction, sedimentation and drainage, namely the AB process operation based on anaerobic ammonia oxidation is realized.

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