CN116332425A - A Wastewater Treatment Method Based on Magnetic Loading Activated Sludge Process - Google Patents

Abstract

The invention relates to a wastewater treatment method based on a magnetic loading activated sludge process, which comprises the following steps: sewage of the original water tank sequentially enters an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank and a clean water tank, and clean water can reach the discharge standard after being treated to be qualified; supplementing magnetic powder to the anaerobic tank or the anoxic tank or the aerobic tank at proper time; and (3) periodically discharging redundant magnetic sludge, crushing the discharged magnetic sludge by a pipeline high shear, enabling the crushed magnetic sludge to enter a magnetic drum separator, continuously and circularly adding the separated magnetic powder into a wastewater treatment system, and discharging the separated sludge as residual sludge. The beneficial effects of the invention are as follows: according to the invention, the magnetic powder is added into the biochemical reaction system through the magnetic powder adding device, so that the microbial community and the magnetic powder form high-concentration magnetic loading activated sludge, the concentration of the activated sludge is effectively improved, and the sludge settling performance is improved.

Description

A Wastewater Treatment Method Based on Magnetic Loading Activated Sludge Process

technical field

The invention relates to the field of wastewater treatment, more precisely, it relates to a wastewater treatment method based on a magnetic loading activated sludge process.

Background technique

The traditional activated sludge method is the most commonly used method in wastewater biological treatment process. In the case of other conditions such as dissolved oxygen, carbon, nitrogen and phosphorus ratio of organic matter, etc., the higher the sludge concentration, the stronger the removal ability of organic matter. However, due to the following two reasons, the maximum sludge concentration of the traditional activated sludge method can only be maintained at about 3g/L:

1) If the sludge concentration is too high, the permeated water will carry too much suspended solids, making sedimentation and separation difficult, resulting in high turbidity of the permeated water, which is not conducive to the subsequent advanced treatment.

2) The higher the sludge concentration, the faster the sludge will be lost when the turbidity of the produced water is difficult to control, thus limiting the further increase of the sludge concentration.

The above factors limit the engineering application of the activated sludge process when the concentration of organic matter in the sewage is high, and it is necessary to expand the scale of the device or combine it with other processes to achieve the expected treatment effect, which will greatly increase investment and operating costs.

Therefore, it is urgent to propose a wastewater treatment method that can increase the concentration of activated sludge while ensuring the stable operation of the system.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide a wastewater treatment method based on the magnetic loading activated sludge process.

In a first aspect, a wastewater treatment device based on a magnetically loaded activated sludge process is provided, including:

Raw water tank, anaerobic tank, anoxic tank, aerobic tank, secondary settling tank, clear water tank, pipeline high shear machine, magnetic drum separator, magnetic powder dosing device and sludge tank;

Wherein, the raw water tank, the anaerobic tank, the anoxic tank, the aerobic tank, the secondary sedimentation tank, and the clear water tank are connected in sequence, and the secondary sedimentation tank is also connected to the pipeline high shear through a sludge pipe. The pipeline high shear machine is connected to the inlet of the magnetic drum separator, and the outlet of the magnetic drum separator is respectively connected to the magnetic powder dosing device, the sludge tank and the anaerobic tank; the magnetic powder dosing device is respectively Connect anaerobic, anoxic and aerobic tanks.

Preferably, the magnetic powder dosing device is provided with a sewage or tap water input port, and equipped with a stirrer.

Preferably, a valve is provided in the magnetic powder feeding pipe.

Preferably, the magnetic drum separator is connected to the anaerobic tank through a sludge return pipe, and the magnetic drum separator is connected to the magnetic powder dosing device through a magnetic powder recovery pipe.

Preferably, both the anaerobic tank and the anoxic tank are equipped with submersible mixers.

Preferably, the aerobic tank is provided with an aeration system, and the aeration system adopts at least one of micronano aeration, micron aeration or mechanical stirring.

Preferably, the aerobic pool is equipped with an online dissolved oxygen meter, and the dissolved oxygen concentration is controlled at 1.0-3.0 mg/L.

Preferably, the aerobic pool is connected to the anoxic pool through a nitrifying liquid return pipe.

In a second aspect, there is provided a wastewater treatment method based on a magnetically loaded activated sludge process, which is performed by any wastewater treatment device based on a magnetically loaded activated sludge process described in the first aspect, including:

Step 1. The sewage in the raw water tank enters the anaerobic pool after being lifted by the raw water pump;

Step 2, the sewage flows into the anoxic pool through the ram at the bottom of the inner pool wall of the anaerobic pool under the action of gravity;

Step 3, the anoxic pool flows automatically to the aerobic pool through the water outlet provided on the pool wall, and the aeration system in the aerobic pool performs stirring and oxygen supply;

Step 4. The effluent from the aerobic tank enters the secondary sedimentation tank, and the biofilm and some fine suspended matter in the sewage are removed by gravity sedimentation;

Step 5. After settling in the secondary settling tank, the effluent flows to the clean water tank by itself;

Step 6. After the sedimentation sludge in the secondary sedimentation tank is crushed by a pipeline high-shear machine, the magnetic powder and sludge are separated by a magnetic drum separator;

Step 7, the separated magnetic powder is added to the anaerobic pool, anoxic pool or aerobic pool through the magnetic powder dosing device; the magnetic powder is a micron level magnetic powder;

Step 8. Part of the sludge after magnetic powder separation is returned to the biochemical section, and part of it is used as excess sludge and then enters the sludge tank; the sludge in the sludge tank needs to be extracted and cleaned regularly.

The beneficial effects of the present invention are:

1. The present invention adds magnetic powder to the biochemical reaction system through the magnetic powder dosing device, which can make the microbial community and the magnetic powder form high-concentration magnetically loaded activated sludge, effectively increase the concentration of activated sludge, and improve the sludge settling performance.

2. The present invention is equipped with a magnetic drum separator connected to the magnetic powder dosing device, which can recover the magnetic powder, thereby reducing the operating cost of the system.

3. The aerobic pool of the present invention is equipped with an online dissolved oxygen meter, which can monitor the wastewater treatment effect in real time and provide decision-making basis.

4. For newly built projects, the present invention can effectively reduce the required biochemical reaction tank footprint; for standard upgrading projects, it can improve sewage treatment efficiency and treatment capacity without changing the original biochemical tank structures.

Description of drawings

Fig. 1 is the structural representation of a kind of waste water treatment device based on magnetic loading activated sludge technology that the application provides;

Description of reference signs: raw water tank 1, anaerobic tank 2, anoxic tank 3, aerobic tank 4, secondary settling tank 5, clear water tank 6, pipeline high shear machine 7, magnetic drum separator 8, magnetic powder dosing device 9 , Sludge pool 10.

Detailed ways

The present invention will be further described below in conjunction with the examples. The description of the following examples is provided only to aid the understanding of the present invention. It should be pointed out that for those skilled in the art, some modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Example 1:

A wastewater treatment device based on the magnetic loading activated sludge process, as shown in Figure 1, includes a raw water tank 1, anaerobic tank 2, anoxic tank 3, aerobic tank 4, secondary sedimentation tank 5, clean water tank 6, pipeline high shear machine 7, magnetic drum separator 8, magnetic powder dosing device 9 and sludge tank 10;

Among them, the original water tank 1, the anaerobic tank 2, the anoxic tank 3, the aerobic tank 4, the secondary sedimentation tank 5, and the clean water tank 6 are connected in sequence, and the secondary sedimentation tank 5 is also connected to the pipeline high shear machine 7 through the sludge pipe , the pipeline high shear machine 7 is connected to the inlet of the magnetic drum separator 8, and the outlet of the magnetic drum separator 8 is respectively connected to the magnetic powder dosing device 9, the sludge tank 10 and the anaerobic tank 2; the magnetic powder dosing device 9 passes the magnetic powder dosing The pipes are respectively connected to anaerobic pool 2, anoxic pool 3 and aerobic pool 4. The staff can choose to add magnetic powder to the anaerobic pool 2, the anoxic pool 3 or the aerobic pool 4 according to different water quality conditions.

The magnetic powder dosing device 9 is provided with a sewage or tap water input port, and is equipped with a stirrer, so that the magnetic powder and sewage or tap water are evenly mixed.

The magnetic powder dosing pipe is provided with a valve, which can be switched to add magnetic powder in one or more pools of the anaerobic pool 2, the anoxic pool 3 and the aerobic pool 4 through the magnetic powder dosing device 9 in good time.

The magnetic drum separator 8 is connected to the anaerobic tank 2 through the sludge return pipe, and the magnetic drum separator 8 is connected to the magnetic powder dosing device 9 through the magnetic powder recovery pipe. The magnetic powder recovered by the magnetic drum separator 8 can be directly added through the magnetic powder Device 9 joins anaerobic tank 2, anoxic tank 3 or aerobic tank 4.

In order to mix the magnetic powder and the sludge evenly, both the anaerobic pool 2 and the anoxic pool 3 are provided with submersible mixers.

Aerobic tank 4 is equipped with an aeration system, which is a high-efficiency aeration and oxygenation device, which can be micro-nano aeration or micro-aeration and other aeration methods, which can significantly improve the efficiency of dissolved air and avoid the death of activated sludge

The aerobic pool 4 is equipped with an online dissolved oxygen meter, and the dissolved oxygen concentration is controlled at 1.0-3.0 mg/L.

The aerobic pool 4 is connected to the anoxic pool 3 through the nitrifying liquid return pipe. This application returns the nitrifying liquid from the aerobic pool to the anoxic pool at the front stage of the process through the return pipeline. The nitrifying liquid contains nitrate nitrogen produced by nitrifying bacteria oxidizing ammonia nitrogen. After they return to the anoxic pool, they can be mixed with the anoxic pool. The organic matter in the influent is mixed, and the denitrification of nitrate nitrogen is carried out by denitrifying bacteria to realize the removal of total nitrogen.

Example 2:

A wastewater treatment method based on the magnetic loading activated sludge process. The sewage from the raw water tank 1 enters the anaerobic tank 2, the anoxic tank 3, the aerobic tank 4, the secondary sedimentation tank 5 and the clean water tank 6 in sequence. Discharge up to standard; timely replenish magnetic powder to anaerobic pool 2, anoxic pool 3 or aerobic pool 4; regularly discharge excess magnetic sludge, and the discharged magnetic sludge is crushed by pipeline high shear machine 7 and then enters magnetic drum separator 8. The separated magnetic powder will continue to circulate and be added to the wastewater treatment system, and the separated sludge will be discharged as residual sludge.

The specific steps of the above method include:

Step 1. The sewage in the raw water tank 1 enters the anaerobic pool 2 after being lifted by the raw water pump;

Step 2, the sewage flows into the anoxic pool 3 through the gate at the bottom of the inner pool wall of the anaerobic pool 2 under the action of gravity;

Step 3, the anoxic pool 3 flows automatically to the aerobic pool 4 through the water outlet provided on the pool wall, and the aeration system in the aerobic pool 4 performs stirring and oxygen supply;

Step 4, the effluent from the aerobic tank 4 enters the secondary sedimentation tank 5, and the biofilm and some fine suspended matter in the sewage are removed by gravity sedimentation;

Step 5, after sedimentation in the secondary settling tank 5, the effluent flows to the clean water tank 6 by itself;

Step 6. After the sedimentation sludge in the secondary settling tank 5 is crushed by the pipeline high shear machine 7, the magnetic powder and sludge are separated by the magnetic drum separator 8;

Step 7, the separated magnetic powder is added to the anaerobic pool, anoxic pool or aerobic pool through the magnetic powder dosing device; the magnetic powder is micron level magnetic powder, and the magnetic powder concentration is 500 mg/L;

Step 8. Part of the sludge after magnetic powder separation is returned to the biochemical section, and part of it is used as excess sludge and then enters the sludge tank; the sludge in the sludge tank needs to be extracted and cleaned regularly.

Example 3:

Adopt the method of embodiment 2 of the present invention to treat certain waste water. The concentration of activated sludge is ≥10g/L, and the recovery rate of magnetic powder is ≥99%. The quality of influent and effluent water is shown in Table 1 below.

Table 1

water quality index unit Influent water quality Water quality COD _Cr mg/L ≤400 ≤50 BOD ₅ mg/L ≤180 ≤10 NH ₃ -N mg/L ≤35 ≤5 TN mg/L ≤50 ≤15 TP mg/L ≤8 ≤0.5 pH mg/L 6～9 6～9

Claims (9)

1. The wastewater treatment device based on the magnetic loading activated sludge process is characterized by comprising a raw water tank (1), an anaerobic tank (2), an anoxic tank (3), an aerobic tank (4), a secondary sedimentation tank (5), a clean water tank (6), a pipeline high shear (7), a magnetic drum separator (8), a magnetic powder feeding device (9) and a sludge tank (10);

the device comprises a raw water tank (1), an anaerobic tank (2), an anoxic tank (3), an aerobic tank (4), a secondary sedimentation tank (5) and a clean water tank (6), wherein the secondary sedimentation tank (5) is connected with a pipeline Gao Jianji (7) through a sludge pipe, the pipeline Gao Jianji (7) is connected with an inlet of a magnetic drum separator (8), and an outlet of the magnetic drum separator (8) is respectively connected with a magnetic powder feeding device (9), a sludge tank (10) and the anaerobic tank (2); the magnetic powder feeding device (9) is respectively connected with the anaerobic tank (2), the anoxic tank (3) and the aerobic tank (4) through magnetic powder feeding pipes.

2. The wastewater treatment device based on the magnetic loading activated sludge process according to claim 1, characterized in that the magnetic powder adding device (9) is provided with a sewage or tap water input port and is provided with a stirrer.

3. The wastewater treatment device based on the magnetic loading activated sludge process according to claim 1, wherein a valve is arranged in the magnetic powder feeding pipe.

4. The wastewater treatment device based on the magnetic loading activated sludge process according to claim 1, wherein the magnetic drum separator (8) is connected with the anaerobic tank (2) through a sludge return pipe, and the magnetic drum separator (8) is connected with the magnetic powder feeding device (9) through a magnetic powder recovery pipe.

5. The wastewater treatment device based on the magnetic loading activated sludge process according to claim 1, characterized in that the anaerobic tank (2) and the anoxic tank (3) are provided with submerged agitators.

6. The wastewater treatment device based on the magnetic loading activated sludge process according to claim 1, wherein the aerobic tank (4) is provided with an aeration system, and the aeration mode adopted by the aeration system is micro-nano aeration or micro-aeration.

7. The wastewater treatment device based on the magnetic loading activated sludge process according to claim 1, wherein the aerobic tank (4) is provided with an on-line dissolved oxygen meter, and the concentration of the dissolved oxygen is controlled to be 1.0-3.0mg/L.

8. The wastewater treatment device based on the magnetic loading activated sludge process according to claim 1, wherein the aerobic tank (4) is connected with the anoxic tank (3) through a nitrifying liquid return pipe.

9. A wastewater treatment method based on a magnetically loaded activated sludge process, characterized by being performed by the wastewater treatment apparatus based on a magnetically loaded activated sludge process as claimed in any one of claims 1 to 8, comprising:

step 1, sewage in a raw water tank (1) enters an anaerobic tank (2) after being lifted by a raw water pump;

step 2, sewage flows into an anoxic tank (3) through a flashboard at the bottom of the inner tank wall of the anaerobic tank (2) under the action of gravity;

step 3, the anoxic tank (3) automatically flows to the aerobic tank (4) through a water outlet arranged on the tank wall, and an aeration system in the aerobic tank (4) is used for stirring and oxygen supply;

step 4, the effluent of the aerobic tank (4) enters a secondary sedimentation tank (5), and biological films and partial fine suspended matters which are fallen off from the sewage are removed through gravity sedimentation;

step 5, the effluent water automatically flows to a clear water tank (6) after being precipitated by a secondary sedimentation tank (5);

step 6, the precipitated sludge of the secondary sedimentation tank (5) is crushed by a pipeline high shear (7) and then separated into magnetic powder and sludge by a magnetic drum separator (8);

step 7, adding the separated magnetic powder into an anaerobic tank (2), an anoxic tank (3) or an aerobic tank (4) through a magnetic powder adding device;

the magnetic powder is micron-level magnetic powder;

step 8, a part of sludge after separating magnetic powder is refluxed into the biochemical section, and the rest of sludge is taken as surplus sludge and enters a sludge tank;

the sludge in the sludge tank needs to be periodically extracted and cleaned.

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