Time-based gradient treatment method for wastewater in aerobic zone

Abstract

Disclosed in the present invention is a continuous time-based gradient treatment method for wastewater in an aerobic zone, comprising an aerobic tank, an aeration device being provided at the position in the aerobic tank close to the bottom, and the aeration amount of the aeration device being controlled, so that the aeration amount in the aerobic zone is in a wavy line arrangement in which the aeration amount cyclically changes continuously from high to low and then from low to high over time. According to the present invention, the aeration amount in the aerobic zone is controlled, so that bacteria in the aerobic tank automatically adapt to the balance under the aeration amount in the wavy line arrangement.

Description

A time-gradient treatment method for aerobic zone of sewage Technical Field

[0001] The present invention relates to the field of sewage treatment, in particular to a time-gradient treatment method for aerobic zones of sewage. Background Art

[0002] A reasonable aeration rate in the aerobic tank will bring excellent water treatment results. Once the aeration rate exceeds the reasonable range, the water treatment quality will not only decline but also exceed the effluent standard.

[0003] If the aeration volume is too small, there will be insufficient dissolved oxygen in the water, resulting in insufficient nitrification, excessive COD and ammonia nitrogen in the effluent, and easy creation of aeration dead zones, which will affect the purification effect.

[0004] Excessive aeration volume or prolonged aeration not only consumes excessive carbon sources, but also leads to high nitrification, sludge floating, and accelerated sludge aging. It also wastes energy and increases operating costs.

[0005] Therefore, it is difficult to find a balance in controlling the aeration volume.

[0006] The current surface aeration aerobic pool achieves aerobic, facultative, and anaerobic states in the vertical gradient from top to bottom to achieve the aeration balance point. However, due to the upward flow of air during surface aeration, a large amount of aeration is not effectively utilized, and energy consumption is greatly increased. Even if this method achieves aerobic, facultative, and anaerobic states in the vertical gradient, it is still impossible to achieve it in the entire space.

[0007] With the emergence of air-suspended fans and suspended magnetic fans, the supply of aeration can be adjusted according to the requirements of the site, but it is only limited to the adjustment at the start. In the later stage, the air-suspended fans and suspended magnetic fans maintain the status at the start. The variable frequency function of the performance of air-suspended fans and suspended magnetic fans has not been effectively utilized in the later stage. Summary of the Invention

[0008] The purpose of the present invention is to provide a time-gradient treatment method for aerobic zone of sewage.

[0009] The innovation of the present invention lies in the frequency conversion control of the aeration volume in the aerobic zone, so that the aeration volume in the aerobic zone forms a wave line arrangement from high to low and then from low to high in a continuous cycle along the time arrangement direction, so that the bacteria in the aerobic pool automatically adapt to this balance under the aeration volume of the wave line. At the same time, a cyclical anaerobic, facultative anaerobic and aerobic environment is formed in the aerobic zone, thereby enriching the types of microorganisms in the aerobic zone, diversifying the biological phase, and domesticating special microbial strains suitable for the environmental conditions, thereby improving the system treatment efficiency and capacity, and obtaining high-quality sewage purification effects.

[0010] To achieve the above-mentioned purpose of the invention, the technical solution of the present invention is: a continuous time-sharing gradient treatment method for sewage aerobic zone, including an aerobic tank, an aeration device is provided near the bottom of the aerobic tank, and the aeration volume of the aeration device is controlled so that the aeration volume in the aerobic zone forms a wavy line arrangement along the time arrangement direction, which continuously cycles from high to bottom and then from low to high.

[0011] Furthermore, the aeration device is connected to a suspended magnetic fan or an air-suspended fan.

[0012] Furthermore, the maximum aeration rate is 3 mg / L.

[0013] Furthermore, the minimum aeration amount is 0.1 mg / L.

[0014] The beneficial effects of the present invention are:

[0015] 1. In the present invention, the aeration rate in the aerobic zone is controlled so that the bacteria in the aerobic pool automatically adapt to the balance under the aeration rate of the wave line.

[0016] 2. The present invention utilizes the variable frequency function of the suspended magnetic fan or the air suspension fan, and continuously adjusts the frequency during the subsequent operation.

[0017] 3. The minimum aeration rate in the present invention is maintained at about 0.1 mg / L, so that the entire environment will not be static and the bacteria will always be in a suspended state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a schematic structural diagram of the present invention. Implementation Method

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings.

[0020] Example 1: A method for continuous time-sharing gradient treatment of sewage in an aerobic zone, comprising an aerobic tank, wherein an aeration device is provided near the bottom of the aerobic tank, the aeration device is connected to a suspended magnetic fan or an air suspension fan, and the aeration rate of the aeration device is controlled so that the aeration rate in the aerobic zone forms a wavy line arrangement along the time arrangement direction, which continuously cycles from high to low and then from low to high. The maximum aeration rate is 3 mg / L and the minimum aeration rate is 0.1 mg / L.

[0021] A fan with a power of 30KW is introduced into two aerobic pools. The water quality in the two aerobic pools is the same, and only the aeration control method is adjusted.

[0022] Traditional control method: maintain the fan power at 100%, the dissolved oxygen level at 2.0-4.0 mg / l, and the energy consumption at 720 (kW·h / d).

[0023] The control method of this patent is shown in the following table:

[0024]

[0025] Comparison table of water quality test of two control methods for 10 consecutive days

[0026]

[0027] From the above data analysis, it can be clearly seen that the patented method requires lower energy consumption than traditional control methods, and the total phosphorus and total nitrogen removal rates are higher than traditional control methods.

[0028] The embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

Claims

1. A method for continuous time-sharing gradient treatment of sewage in an aerobic zone, comprising an aerobic tank, wherein an aeration device is provided near the bottom of the aerobic tank, characterized in that: The aeration volume of the aeration device is controlled so that the aeration volume in the aerobic zone forms a wave line arrangement along the time arrangement direction, which continuously cycles from high to low and then from low to high.

2. The method for continuous time-sharing gradient treatment of sewage aerobic zone according to claim 1, characterized in that: The aeration device is communicated with a suspended magnetic fan or an air-suspended fan.

3. The method for continuous time-sharing gradient treatment of sewage aerobic zone according to claim 1, characterized in that: The maximum aeration rate is 3 mg / L.

4. The method for continuous time-sharing gradient treatment of sewage aerobic zone according to claim 1, characterized in that: The minimum aeration amount is 0.1 mg / L.

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