CN103193359B - Deposition and biological filter combined water purification system - Google Patents

Abstract

The invention discloses a sedimentation cooperative biological filter combined water purification system and a water purification method. A sedimentation cooperative biological filter combined water purification system, the sedimentation tank is located inside the biological aerated filter, the sedimentation tank and the biological aerated filter are connected by overflow, and the bottom of the biological filter is connected with an aeration device, and the raw water A dosing device is provided on the water inlet pipe. The water purification method of the present invention comprises the following steps: (1) raw water is mixed with a coagulant through a static mixer; (2) flocculation; (3) precipitation; (4) filtration, biological treatment, and water purification. In the sedimentation synergistic biological filter combined water purification system of the present invention, the sedimentation part and the biological aerated filter part are independent of each other, and each stage in the water treatment does not affect each other, and under the synergistic effect of sedimentation, filtration and biology, each stage can The predetermined treatment effect is achieved, and the effluent water quality is stable.

Description

A combined sedimentation and biological filter combined water purification system

technical field

The invention relates to a combined water purification system and water purification method of a sedimentation cooperative biological filter, which can be used for the treatment of urban domestic sewage. the

Background technique

The urban land resources are becoming more and more tense, and the land use of urban sewage treatment plants is under control. Therefore, the construction of a new sewage treatment technology with a small footprint and high treatment efficiency is suitable for my country's national conditions, is the focus of sewage treatment research, and has important practical significance for promoting the restoration of the water environment. the

Biological aerated filter is a form evolved from ordinary biological filter. It integrates the interception of suspended solids and biological oxidation, and has the advantages of small footprint, good effluent quality, and no sludge bulking. The SS requirements of water are relatively strict, so the water needs to be pretreated. the

The content of phosphorus nutrients in sewage increases, and after sewage treatment is discharged into natural water bodies, it still contains a large amount of phosphorus, which is the main cause of eutrophication. From the current research, it can be seen that the phosphorus removal effect of simply using the biological aerated filter is poor, and effective chemically enhanced phosphorus removal must be used. The purpose of the present invention is to solve the problems existing in the above-mentioned biological aerated filter, and provide a combined water purification system and water purification method of the sedimentation cooperative biological filter. the

Contents of the invention

In order to solve the above problems, the present invention includes a sedimentation biological aerated filter, a coagulation device, and a dissolved air chamber. The sedimentation biological aerated filter includes a sedimentation tank and a biological aerated filter. The sedimentation tank is located inside the biological aerated filter, and the upper part is connected. The water after the sedimentation treatment enters the biological aerated filter from the upper part of the sedimentation tank through overflow. The water flow in the biological aerated filter is downward, the bottom of the filter is connected with the dissolved air chamber, the raw water inlet pipe is connected with the upper part of the sedimentation tank, and the raw water inlet pipe is equipped with a coagulation device. the

The settling tank is of vertical flow type, the outer wall is cylindrical, the biological aerated filter is built on its outer side and is cylindrical, the outer wall of the settling tank is used as the inner wall of the filter, and is not connected to each other, and the water of the settling tank overflows from the upper part to the filter. pool, the operation of the two pools does not interfere with each other, and the operation is stable. the

The sedimentation tank and the biological aerated filter are cylindrical, and the inner diameter ratio is 1:3. Since the sedimentation tank is placed inside the biological aerated filter, the actual effective surface area ratio is 1:8. The sedimentation tank and the biological aerated filter The pools are the same height. the

The coagulation device is a tubular static mixer, which is installed on the raw water inlet pipe and is used for adding coagulant. It has a simple structure, small size, no need to occupy special space, easy installation, low investment and long service life. , High mixing efficiency, achieving the purpose of instant mixing and saving energy. the

The gas dissolving chamber includes a gas generating device, an air compressor, and an aeration head. The air compressor is connected to the aeration pipe in the container room, and the aeration pipe is connected to the aeration head, which can well ensure that the oxygen content in the water is not less than 2mg/l, and provide sufficient oxygen for the microbial degradation of organic matter. the

A water purification method using the above-mentioned sedimentation cooperative biological filter combined water purification system, comprising the following steps: (1) introducing sewage to the sump, and adding coagulant to the raw water inlet pipe, and using a tubular static mixer to The sewage is completely mixed with the coagulant; (2) The water after dosing enters the sedimentation tank through the water inlet pipe, and the flocs formed in the static mixer settle here to remove some pollutants and most of the phosphorus; (3) The settled The water flows into the biological aerated filter tank, and the water flows downward into the filter tank in the form of downward flow; (4) Compressed air is introduced into the dissolved air chamber, and the air-water volume ratio is 1:1; (5) The sludge at the bottom of the sedimentation tank is discharged into the sewage Mud concentration tank, the filtered water is discharged from the clean water outlet pipe; (6) Backwash the biological aerated filter after running for a period of time, first air washing for 5 minutes, then air-water combined washing for 3 minutes, and then water washing for 10 minutes . the

Beneficial effects of the present invention: the settling pond and the biological aerated filter of a sedimentation synergistic biological filter combined water purification system are independent of each other, and each stage of water quality treatment can be completed at opposite positions, and the present invention has compact structure and modularization The structure is convenient for later reconstruction and expansion, as well as equipment production, and can also be used in factories and enterprises with small sewage volumes. Through the physical, chemical and biological treatment of sewage, the purpose of sewage purification is achieved, and the requirements of simultaneous nitrogen and phosphorus removal are met, which helps to protect the environment and save resources. the

Description of drawings

Fig. 1 is a flow chart of a sedimentation synergistic biological filter combined water purification system of the present invention; Fig. 2 is an A-A sectional view of the present invention, which is further explained in conjunction with this figure. the

Accompanying drawing 1 is the schematic flow chart of the present invention; Fig. 2 is the A-A sectional view of the present invention. the

In Figure 1: 1 sump, 2 sewage pump, 3 sewage pipe, 4 static mixer, 5 sedimentation tank, 6 biological aerated filter, 7 filler, 8 supporting layer, 9 clean water outlet pipe, 10 air compressor , 11 aeration pipe, 12 aeration head, 13 clean water tank, 14 backwash water pump, 15 backwash inlet pipe, 16 mud discharge pipe, 17 mixing tank, 18 metering pump, 19 dosing pipe, 20 backwash outlet pipe ; Among Fig. 2: 9 clean water outlet pipes, 11 aeration pipes, 11 aeration pipes are equipped with aeration heads. the

Detailed ways

Embodiment one:

Accompanying drawing is a kind of concrete embodiment of the present invention, and this embodiment comprises the sump 1 of collecting sewage, and sump 1 enters sedimentation tank 5 through sewage pump 2 through sewage pipe 3, the mixing pool 17 of preparation coagulant, by throwing The metering pump 18 adding coagulant is connected with the static mixer 4. After the coagulant and sewage are fully mixed in the static mixer, they enter the sedimentation tank through the sewage pipe 3. The bottom of the sedimentation tank is connected with a mud discharge pipe 16. The water treated in the sedimentation tank 5 enters the biological aerated filter tank 6 through overflow, and the bottom of the aeration tank is connected with an aeration pipe 11 connected with an air compressor 10, and a backwash pipe 15 is connected with a backwash pump 14. The upper part of the gas pool is connected with a backwash outlet pipe 20. the

Concentrate the sewage into the sump 1, and enter the sedimentation tank 5 through the sewage pump 2 through the sewage pipe 3. The sewage pipe is equipped with a static mixer 4, and the coagulant is pressurized into the static mixer through the 18 metering pump. In the static mixer, the coagulant and the sewage are fully mixed and then enter the sedimentation tank through the 3 sewage pipe for preliminary precipitation and precipitation. A sludge discharge pipe 16 is connected to the bottom of the tank to discharge the settled sludge. The sludge is transported away by truck after simple treatment, and the water treated in the sedimentation tank 3 enters the biological aerated filter 6 through the overflow, and the filling area 7 It is a composite zeolite filter material with a packing height of 1200mm. Below the packing area is a support layer 8 that acts as a support. The aeration head 12 is built in the dissolved air chamber 21 under the packing area, and the aeration head 12 is connected to the aeration pipe 11. , the water outlet pipe 9 and the backwashing water inlet pipe 15 are arranged on the lower part of the aeration head, and the air compressor 10 is ventilated into the aeration tank to provide sufficient oxygen for the microorganisms. When the predetermined running time is reached, the filter tank For backwashing, the air compressor is used for air washing first, then the water pump and air compressor are used to wash the filter together with air and water, and then the water pump is washed for water washing, and the water after backwashing is discharged through the backwashing outlet pipe. the

The water purification method using the above-mentioned sedimentation biological aerated filter system includes the following steps: (1) introduce sewage into the sedimentation tank, the hydraulic load of the water intake is 5m ³ /m ² h, and pipe static mixing on the raw water inlet pipe Add a coagulant to the device to fully mix the sewage and the coagulant to form flocs; (2) The water after dosing enters the sedimentation tank 5, and under the action of gravity, the flocs settle to the bottom of the sedimentation tank, and the hydraulic retention time is 1.5 h; (3) The water after sedimentation treatment enters the biological aerated filter tank, and the sewage in the filter tank is intercepted by the filter material, and the microbial decomposition enters the water outlet area, and the hydraulic retention time is 1.25h; (4) When the raw water flows through the filler , through the air compressor to aerate the dissolved air chamber to provide sufficient oxygen for the growth of microorganisms and the decomposition of organic matter, the pressure of the air compressor is 0.3MPa, and the volume ratio of gas to water is 1:1; The mud is discharged into the sludge thickening tank, and after simple treatment, it is transported away by car, and the filtered water is discharged from the clean water outlet pipe;

Embodiment two:

The water purification system of the sedimentation biological aerated filter in this specific embodiment is the same as the water purification system of the sedimentation biological aerated filter in the specific embodiment 1. the

The difference between this water purification method and the specific embodiment one water purification method is that the air-water volume ratio of the aeration is 2:1. the

Embodiment three:

The water purification system of the sedimentation biological aerated filter in this specific embodiment is the same as the water purification system of the sedimentation biological aerated filter in the specific embodiment 1. the

The difference between this water purification method and the water purification method in Embodiment 1 is that the air-to-water volume ratio of the aeration is 3:1. the

Claims (3)

1. the collaborative biological filter of a settling tank composition type clear water system, comprise settling tank and BAF, water collecting basin is connected with settling tank by sump pump, on the pipeline section connecting, tubular static mixer is installed, it is characterized in that, settling tank (5) is placed in BAF (6) inside, the outer wall of settling tank (5) is as the inwall of BAF (6), settling tank water outlet (5) enters BAF (6) by top overflow, BAF (6) current are lower to stream, settling tank is vertical-flow, outer wall is cylinder shape, BAF is built in the outside of settling tank, also be cylinder shape, the internal diameter ratio of settling tank and BAF is 1: 3, BAF (6) bottom is communicated with molten air chamber.

2. water cleaning systems described in claim 1, it is characterized in that, aeration tube (11), back flushing water inlet pipe (15), rising pipe (9) are installed in described BAF bottom, and air compressor (10) is connected with aeration tube (11) and back flushing water inlet pipe (15) respectively with backwash pump (14).

3. water cleaning systems described in claim 1, is characterized in that, BAF (6) inner stuffing is composite zeolite filter material.

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