CN201031170Y - Two-stage filtration membrane bioreactor - Google Patents

Abstract

The utility model relates to a two-stage filter membrane bioreactor, comprising a biochemical filter chamber, ultra-filtration membrane components, a membrane filter chamber which is connected with the biochemical filter chamber, and a clear-water tank, and is characterized in that the two chambers are communicated by an overflow port which is provided with a gate, the ultra-filtration membrane components are immersed in the membrane filter chamber, and the biochemical filter chamber is communicated with the membrane filter chamber through the overflow port which is provided with the electric gate. Firstly, sewage water is passed through the biochemical filter chamber to be primarily and bio-chemically processed, the organic pollutant in the sewage water is degraded and the organic pollutant is like COD, ammonia nitrogen, and phosphor, and most of the suspended particulate matters are synchronously removed from the water, secondly, the primarily processed sewage water enters the membrane filter chamber, the suspended particulate matter is further removed from the water through the immersed ultra-filtration membranes. The utility model has the advantages that the filter-operating load of the ultra-filtration membranes is reduced, the membrane flux of the membrane filter unit is enhanced, and the operation is more stable and reliable.

Description

Two-stage filtration membrane bioreactor

technical field

The utility model relates to a two-stage filtration membrane bioreactor, which belongs to sewage purification equipment.

Background technique

Membrane bioreactor is a kind of sewage purification equipment that has been widely used in recent years. It includes the process of biochemical reaction to decompose organic pollutants and the process of membrane filtration to remove solid particles and suspended solids. In the currently known membrane bioreactors, the ultrafiltration membrane module is directly placed in the high-concentration activated sludge mixture in the biochemical reaction tank, and purified water is obtained through the precise filtration of the membrane. However, the disadvantages are: the high-concentration SS mixed solution is directly filtered through the membrane, which seriously pollutes the membrane surface, resulting in a decrease in the membrane flux. It is necessary to increase the membrane area to increase the membrane flux; in order to reduce the formation of mud cake layer on the membrane surface, The packing density of the ultrafiltration membrane module must be reduced, so the equipment is not compact and the floor space is increased; the system needs to continuously wash the mud cake layer on the membrane surface with a large flow of air on the surface of the ultrafiltration membrane, and the energy consumption is high; all of the above make the operating cost Increase. In addition, the ultrafiltration membrane module is directly immersed in the high-concentration activated sludge mixture. Once the ultrafiltration membrane module is broken, it will cause huge fluctuations in the quality of the effluent, which will seriously affect the reliability of the subsequent reverse osmosis system.

Contents of the invention

The purpose of this utility model is to provide a two-stage filtration membrane bioreactor, aiming at overcoming the above-mentioned defects of the existing membrane bioreactor, improving membrane flux, reducing system cost and energy consumption, and improving the stability of effluent water quality.

The two-stage filtration membrane bioreactor of the utility model contains a biochemical filtration chamber and an ultrafiltration membrane assembly. The lower part of the biochemical filtration chamber is a water distribution area. The water distribution area is provided with a raw water inlet connection pipe and a raw water pump, and a filter head and a biological filler are installed above the water distribution area. layer and aeration pipe, the ultrafiltration membrane module is connected with the water purification outlet connection pipe and the water purification pump. The gate, the said ultrafiltration membrane module is immersed in the membrane filtration chamber, can be an electric gate.

Said aeration pipe is connected with a fan, and the fan provides oxygen required for biochemical degradation to the packing layer through the aeration pipe.

The biochemical filter chamber and the ultrafiltration membrane module are connected with a backwash air intake pipe and a backwash blower.

The biochemical filter chamber and the ultrafiltration membrane module are connected with a backwash water inlet pipe and a backwash pump.

The biochemical filter chamber and the ultrafiltration membrane module are connected with a backwash fan and a backwash pump, which can regularly or irregularly blow and pump clean water to flush the biochemical filter chamber and the ultrafiltration membrane.

The membrane filter chamber is connected with a return water outlet pipe and a return water pump. It is used to return the concentrated water or backwash water from the membrane filtration chamber to the original water tank to participate in the primary biochemical treatment again.

The inlet of the aeration pipe, the backwash inlet of the ultrafiltration membrane module and the biofiltration chamber, the backwash water inlet of the ultrafiltration membrane and the biofiltration chamber, and the return pipe of the membrane filtration chamber are respectively equipped with control valves.

Said control valves and electric gates are all connected with the automatic control system.

Adopting the purification device of the utility model makes the purification of sewage be divided into two stages. First, the sewage is passed into the biochemical filtration chamber for primary biochemical treatment to degrade organic pollutants such as COD, ammonia nitrogen, and phosphorus in the sewage, and simultaneously remove most of the suspended particulate matter in the water; then carry out the second-stage membrane filtration treatment to further remove Suspended particulate matter in the water and intercepts the microorganisms passing through the primary biochemical filtration unit. After removing most of the dirt in the first stage, the operating load of the ultrafiltration membrane filtration for the secondary purification is reduced, the membrane flux of the membrane filtration unit is increased, and the operation of the membrane filtration module is more stable and reliable, thereby reducing The design scale and footprint of the small ultrafiltration membrane module further reduce the system cost. The utility model is equipped with membrane backwashing and backflushing systems to remove membrane surface pollutants and improve membrane flux; a backflow system for concentrated water and backwash water in membrane filtration chambers is provided to prevent excessive strains with long generation cycles The loss improves the removal efficiency of the membrane bioreactor, which is difficult for traditional biochemical treatment processes.

Description of drawings

The accompanying drawing is a schematic diagram of the system structure of a two-stage filtration membrane bioreactor for water purification.

The numbers in the figure are expressed as: 1—raw water tank, 2—biochemical reaction chamber, 3—membrane filtration chamber, 4—clean water tank, 5—raw water pump, 6—aeration fan, 7—clean water pump, 8—backwash water pump , 9—Backwash fan, 10—Return pump, 11—Electric gate, 12—Raw water inlet valve, 13—Aeration valve, 14—Biochemical backwash discharge valve, 15—Biological packing layer, 16—Water distribution chamber, 17 —Filter Head, 18—Submerged Ultrafiltration Membrane Module, 19—Biochemical Filtration Chamber Backwash Inlet Valve, 20—Biochemical Chamber Backflush Valve, 21—Ultrafiltration Membrane Module Backflush Valve, 22—Membrane Filtration Chamber Backwash Backwash Water discharge valve, 23—ultrafiltration membrane module backwash water inlet valve, 24—water purification valve, 25—aeration pipe.

Detailed ways

As shown in the figure, the raw water from the raw water tank 1 is lifted by the raw water pump 5 and enters the water distribution chamber 16 at the bottom of the biochemical filter chamber 2 through the raw water inlet valve 12, and enters the active biological packing layer 15 through the filter head 17, and enters the active biological packing layer 15 in the packing layer 15. The bottom is mixed with the airflow ejected from the aeration pipe 25, and the organic pollutants in the water are in full contact with the microorganisms attached to the surface of the filler, and are absorbed and degraded under the action of oxygen in the aeration (the aeration is blown in by the fan 6 through the control valve 3 ); at the same time, most of the suspended particles in the water are intercepted by the filler layer, and the preliminary purified water filtered by the filler layer 15 enters the upper area of the biochemical filter chamber 2, and then overflows into the membrane filter chamber 3 through the electric gate 11, and the ultrafiltration membrane assembly 18 immersion. Under the suction of the clean water pump 7, the clean water passing through the membrane surface enters the clean water tank 4 through the control valve 24.

The system is equipped with a backwash pump 8 and a backwash fan 9. The clean water in the clean water tank 4 is used to perform combined air-water backwash on the biochemical reaction chamber 2 and the ultrafiltration membrane module 18 on a regular basis to remove the deposits on the membrane surface and the biochemical filler layer. pollutants to prevent clogging. Concentrated water in the membrane filtration chamber 3 or backwashed sewage backflow pump 10 returns to the raw water tank 1 to recover bacteria with a long generation cycle (such as nitrifying bacteria, etc.), prevent the loss of this part of the bacteria, and improve the biochemical treatment effect. The backwashed sewage in the biochemical reaction chamber 2 is discharged from the biochemical backwash discharge valve 14 .

The system is equipped with the following control valves:

The raw water pump is connected with the raw water inlet valve 12, the aeration pipe is connected with the aeration valve 13, the clean water pump 7 is connected with the clean water valve 24, the backwash air intake pipe is equipped with the backwash water inlet valve 23 and 19, and the backwash inlet The air pipe is equipped with air intake valves 21 and 20, and the return water outlet pipe is equipped with return valve discharge valves 22 and 14.

Each control valve 12, 13, 14, 19, 20, 21, 22, 23, 24 all adopts automatic valves, and they all link to each other with the automatic control system with the electric gate 11, open and close in good time automatically.

Claims (7)

1. Two-stage filtration membrane bioreactor, including a biochemical filtration chamber (2) and an ultrafiltration membrane module (18), the lower part of the biochemical filtration chamber (2) is a water distribution area (16), and the water distribution area is provided with a raw water inlet connection and a raw water A water pump (5), a filter head (17), a biological filler layer (15) and an aeration pipe (25) are installed above the water distribution area, and the ultrafiltration membrane module (18) is connected with a clean water outlet connection pipe and a clean water pump (7), It is characterized in that it also includes a membrane filtration chamber connected with the biochemical filtration chamber, and the two chambers are connected by an overflow port, and the overflow port is provided with a gate (11), and the ultrafiltration membrane module (18) is immersed in the membrane filtration chamber. indoor. 2. The two-stage filtration membrane bioreactor according to claim 1, characterized in that the inlet pipe of said aeration pipe (25) is connected with a blower fan (6). 3. The two-stage filtration membrane bioreactor according to claim 1, characterized in that said biochemical filter chamber (2) and ultrafiltration membrane module (18) are connected with a backwash inlet pipe and a backwash fan (9) . 4. The two-stage filtration membrane bioreactor according to claim 3, characterized in that the biochemical filtration chamber (2) and the ultrafiltration membrane module (18) are connected with a backwash inlet pipe and a backwash pump (8). 5. The two-stage filtration membrane bioreactor according to claim 4, characterized in that said membrane filtration chamber (3) is connected with a return water outlet pipe and a return water pump (10). 6. The two-stage filtration membrane bioreactor according to claim 5 is characterized in that the following control valves are provided: the raw water pump is connected with a raw water inlet valve (12), the aeration pipe is connected with an aeration valve (13), The clean water pump (7) is connected with the clean water valve (24), the backwash air inlet pipe is equipped with the backwash water inlet valve (23) and (19), the backwash air inlet pipe is equipped with the air inlet valve (21) and (20 ), the backwater outlet pipe is equipped with a backwater valve discharge valve (22) and (14), and said gate (11) is an electric gate. 7. two-stage filtration membrane bioreactor according to claim 6, is characterized in that said each control valve (12), (13), (24), (23), (19), (21), (20), (22), (14) and electric gate (11) all link with automatic control system.