CN105948240B - A kind of anaerobic membrane bioreactor of stable operation - Google Patents

Abstract

The invention discloses a stably operating anaerobic membrane bioreactor. The anaerobic membrane bioreactor includes a water inlet tank, a main reactor, a regulating tank, a membrane tank, a connecting tank, an insulation layer, a temperature control system, an aeration bar, a membrane module, a gas collection device, a filtration control system, a water distribution board, Heating rod, inclined plate separation device, gas flow meter, circulating pump control system, pressure sensor, solenoid valve, water inlet pump, thermal insulation layer circulating water pump, air pump, membrane pool circulating water pump and filter pump, thermal insulation layer circulating water pump, membrane pool circulating water pump , The filter pump is equipped with a corresponding automatic control system, and the air pump is equipped with a gas flow meter to control the aeration volume; the insulation layer wraps the main reactor, and the temperature required by the main reactor is guaranteed by controlling the temperature of the circulating water. The invention has the advantages of stable operation, low investment and operation cost, convenient management, small occupied area, and not easy to be blocked.

Description

An Anaerobic Membrane Bioreactor with Stable Operation

technical field

The invention belongs to the technical field of sewage treatment, in particular to a stably operating anaerobic membrane bioreactor.

Background technique

Anaerobic membrane bioreactor is a new wastewater treatment technology that combines anaerobic biological treatment technology and membrane separation technology. Due to the limitation of the operating conditions of the anaerobic membrane bioreactor, there are problems such as cumbersome operation and easy clogging in the operation process of the anaerobic membrane bioreactor. Among them, easy clogging is one of the main difficulties in technical application.

Contents of the invention

The object of the present invention is to provide a reliable and stable anaerobic membrane bioreactor for the above problems.

The present invention is achieved in this way: a stably operating anaerobic membrane bioreactor, including a water inlet tank, a main reactor, a regulating tank, a membrane tank, a connecting tank, a thermal insulation layer, a temperature control system, an aeration bar, a membrane module, Gas collection device, filtration control system, water distribution plate, heating rod, inclined plate separation device, gas flow meter, circulation pump control system, pressure sensor, solenoid valve, water inlet pump, insulation layer circulation pump, air pump, membrane pool circulation pump and The filter pump, the circulating water pump of the insulation layer, the circulating water pump of the membrane pool, and the filter pump are equipped with a corresponding automatic control system, and a gas flow meter is installed behind the air pump to control the aeration rate; the inlet pump is used to transport the inlet water to the bottom of the main reactor, The bottom of the pool is connected to the circulating water pump of the membrane pool. The circulating water pump of the membrane pool is used to transport the circulating water in the membrane pool to the bottom of the main reactor. The pool is a whole, and is connected to the main reactor through the connecting tank. The main reactor and the membrane pool are the main body of the reactor. The temperature of the water is adjusted by controlling the heating rods of the temperature control system, and the circulation is realized by the circulating water pump of the insulation layer. The water distribution plate is set at the bottom of the main reactor. The opening ratio of the water distribution plate is 1:5, and the There is a gauze on the top to prevent clogging. In the upper part of the main reactor, there is a sloping plate separation device consisting of two stages of sloping plates. The sloping plate angle is 55 degrees to achieve efficient solid-liquid separation and anaerobic sludge recycling. Return to the reaction area; the main reactor is connected with the regulating tank and the membrane pool on the upper part of the main reactor through the connecting tank, with an inclination angle of 55 degrees, which is used to settle the sludge floating with the water and prevent the reactor from being blocked due to channel blockage; After the connection tank and in front of the membrane tank, there is an adjustment tank for further sedimentation and separation of sludge, preventing rapid pollution of the membrane modules caused by large particles flowing into the membrane tank, and also preventing the disturbance caused by aeration in the membrane tank from affecting the connection tank. Precipitation effect; there is an aeration bar under the membrane module, and the anaerobic reaction generates gas to aerate and flush the membrane module through the air pump, and the aeration intensity is controlled by the gas flow meter, which overcomes the limitation that the aeration cannot be used for the anaerobic reaction; A pressure sensor is installed on the filter pipe to connect with the filter control system. When the pressure of the pipeline exceeds the set value, the system will be automatically stopped; the filter control system controls the opening and closing of four solenoid valves to control the discharge of membrane effluent and the flow of effluent back into the membrane pool. Filtration and backwashing can be completed without changing the rotation direction of the filtration pump, which prolongs the service life of the membrane module and the filtration pump.

The invention has the advantages of stable operation, low investment and operation cost, convenient management, small occupied area, and not easy to be blocked.

Description of drawings

Fig. 1 is the schematic diagram of the anaerobic membrane bioreactor of the present invention.

Marks in the figure: L1-inlet water; L2-membrane outlet water; L3-outlet water; L4-membrane pool circulating water; L5-insulation layer circulating water; Ⅰ-water inlet pool; Ⅱ-main reactor; Membrane tank; Ⅴ-connection tank; Ⅵ-insulation layer; 1-temperature control system; 2-aeration bar; 3-membrane module; 4-gas collection device; 5-filtration control system; 6-water distribution plate; 7- Heating rod; 8- inclined plate separation device; 9- gas flow meter; 10- circulation pump control system; 11- pressure sensor; 12- solenoid valve, respectively marked as ①, ②, ③ and ④; Air; P1-water inlet pump; P2-insulation layer circulating water pump; P3-air pump; P4-membrane pool circulating water pump; P5-filter pump.

Detailed ways

Example:

In this embodiment, domestic sewage from a community in Guilin is used as influent water for treatment.

As shown in Figure 1, a stably operating anaerobic membrane bioreactor includes water inlet tank I, main reactor II, regulating tank III, membrane tank IV, connecting tank V, insulation layer VI, temperature control system 1, and exposure tank. Air bar 2, membrane module 3, gas collection device 4, filtration control system 5, water distribution plate 6, heating rod 7, inclined plate separation device 8, gas flow meter 9, circulation pump control system 10, pressure sensor 11, solenoid valve 12. Inlet pump P1, thermal insulation layer circulating water pump P2, air pump P3, membrane pool circulating water pump P4 and filter pump P5, thermal insulation layer circulating water pump P2, membrane pool circulating water pump P4, and filter pump P5 have corresponding automatic control systems, and air pump P3 There is a gas flow meter 9 to control the aeration rate; the water inlet pump P1 is used to transport the water inlet L1 to the bottom of the main reactor II, the bottom of the membrane pool IV is connected to the membrane pool circulating water pump P4, and the membrane pool circulating water pump P4 is used to transfer the membrane pool The membrane tank circulating water L4 in IV is sent to the bottom of the main reactor II, and the influent L1 and the membrane tank circulating water L4 are mixed and then input from the bottom of the main reactor II; the regulating tank III and the membrane tank IV are integrated, and are connected through the Tank Ⅴ is connected to the main reactor Ⅱ, the main reactor Ⅱ and the membrane pool Ⅳ are the main body of the reactor, the insulation layer Ⅵ is wrapped outside the main reactor Ⅱ, and the insulation layer Ⅵ is filled with the circulation water L5 of the insulation layer, and the insulation layer The temperature of the water L5 is regulated by controlling the heating rod 7 through the temperature control system 1, and the circulation is realized through the thermal insulation layer circulating water pump P2. The water distribution plate 6 is arranged at the bottom of the main reactor II, and the opening ratio on the water distribution plate 6 is 1: 5. A gauze is provided on the water distribution plate 6 to prevent clogging, and a sloping plate separation device 8 composed of two stages of sloping plates is installed in the upper middle of the main reactor II. The sloping plate angle is 55 degrees to realize The solid-liquid separation is efficient, and the anaerobic sludge returns to the reaction area; the main reactor II, the regulating tank III and the membrane tank IV are connected on the upper part of the main reactor II through the connecting tank V, and the inclination angle is 55 degrees, which is used to float with the water. The sedimentation of the sludge, and to prevent the reactor operation failure caused by channel blockage; after the connection tank Ⅴ, in front of the membrane pool Ⅳ, there is an adjustment tank Ⅲ, which is used to further precipitate and separate the sludge, and prevent large particles from flowing into the membrane pool Ⅳ to cause membrane modules 3, and at the same time prevent the disturbance caused by aeration in the membrane pool IV from affecting the sedimentation effect of the connection tank V; under the membrane module 3, an aeration bar 2 is arranged, and the anaerobic reaction gas G1 passes through the air pump P3 to the membrane module 3 Carry out aeration and flushing, and control the aeration intensity through the gas flow meter 9, which overcomes the limitation that aeration cannot be used for anaerobic reaction; a pressure sensor 11 is provided on the filter pipeline to connect with the filter control system 5, when the pipeline pressure exceeds the set After the value is set, the system is automatically stopped; the filtration control system 5 controls the opening and closing of the four solenoid valves 12 to control the discharge of the membrane effluent L2 and the reflow of the effluent L3 back to the membrane pool IV, so as to complete the filtration without changing the rotation direction of the filter pump P5 With backwashing, the service life of the membrane module 3 and the filter pump P5 is extended. The size of the main reaction pool II is: length × width × height = 150mm × 150mm × 1000mm. The overall size of the regulating tank III and the membrane pool IV is: length × width × height = 250mm × 100mm × 270mm. Among them, the adjustment tank III is 30mm wide, and there is a partition plate with a height of 300mm in the middle to separate it from the membrane pool IV. On the top of the partition plate, there are evenly distributed protrusions with a length of 10mm and a width of 10mm.

The inflow process of the influent L1 is as follows: the influent L1 first enters from the bottom of the main reactor II by the influent pump P1, flows into the granular sludge area evenly after being distributed by the water distribution plate 6, and passes through the solid-liquid separation device 8 in the middle and upper parts. After separation, the sewage continues to rise and flows into the regulating tank III through the connecting tank V. During this process, a solid-liquid separation is carried out again. After the sewage flowing into the regulating tank III is fully mixed and settled, it overflows into the membrane tank IV. When the membrane module 3 When filtering, the ①③ solenoid valve on the diagonal is closed, ②④ the solenoid valve is opened, and the sewage is discharged through the filter pump P5. When the membrane module 3 is backwashed, ①③ the solenoid valve is opened, ②④ the solenoid valve is closed, and the filtered water After the filter pump P5 flows back to the membrane pool IV, during the operation of the overall system, the direction of the filter pump P5 remains unchanged, preventing the impact on the pump caused by frequent changes in the rotation direction. The bottom of the membrane pool IV is connected to the membrane pool circulating water pump P4, and the automatic control system can mix the circulating water L4 of the inner membrane pool of the membrane pool IV and the influent L1 into the main reactor II according to the set control cycle ratio. Level gauge, when the liquid level is lower than the set position, the membrane pool circulating water pump P4 will automatically stop running.

The flow direction of the circulating water L5 of the insulation layer: After the temperature control system 1 sets the required temperature, the heating rod 7 starts to work, and the circulating water flows in from the bottom of the insulation layer VI through the insulation layer circulation pump P2, and then flows back to the pool from the top of the insulation layer VI During heating, when the predetermined temperature is reached, the heating rod 7 stops working, and when the temperature is lower than the predetermined value, it is heated again.

Anaerobic reaction gas production G1 flow direction: Anaerobic reaction gas production G1 passes through the air pump P3 and aeration strip 2 at the top of the main reactor II to aerate and scour the surface of the membrane module 3, and finally enters the gas collection device 4 of the membrane tank IV , the aeration rate is controlled by the gas flow meter 9.

After three weeks of operation, the anaerobic membrane bioreactor in this embodiment still operated stably, and no water inlet hole was blocked.

Table 1: Influent and effluent water quality table

COD COD Influent (mg/L) 172 Influent (mg/L) 124 Effluent (mg/L) 85 Effluent (mg/L) 73 Influent (mg/L) 130 Influent (mg/L) 114 Effluent (mg/L) 62 Effluent (mg/L) 64 Influent (mg/L) 106 Influent (mg/L) 125 Effluent (mg/L) 63 Effluent (mg/L) 68

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are still within the scope of this invention. The protection scope of the technical solution of the invention.

Claims (1)

1. a kind of anaerobic membrane bioreactor of stable operation, it is characterised in that the anaerobic membrane bioreactor includes intake pool (I), main reactor (II), regulating tank (III), membrane cisterna (IV), link slot (V), insulating layer (VI), temperature control system (1), exposure Gas bar (2), membrane module (3), gas collector (4), filtering control system (5), water distributing plate (6), heating rod (7), inclined plate point From device (8), gas flowmeter (9), cycle pump control system (10), pressure sensor (11), solenoid valve (12), intake pump (P1), insulating layer water circulating pump (P2), air pump (P3), membrane cisterna water circulating pump (P4) and filter pump (P5), insulating layer water circulating pump (P2), membrane cisterna water circulating pump (P4) and filter pump (P5) are equipped with corresponding automatic control system, and air pump (P3) is equipped with gas stream afterwards Gauge (9) controls aeration quantity；For that will intake, (L1) is defeated to arrive main reactor (II) bottom to intake pump (P1), and membrane cisterna (IV) bottom connects Membrane cisterna water circulating pump (P4) is connect, membrane cisterna water circulating pump (P4) is used for the membrane cisterna recirculated water (L4) in membrane cisterna (IV) is defeated to main reaction Device (II) bottom, water inlet (L1) mixed with membrane cisterna recirculated water (L4) after together from main reactor (II) bottom input；Regulating tank (III) it is an entirety with membrane cisterna (IV), and is connect with main reactor (II) by link slot (V), main reactor (II) and film Pond (IV) is the main body of this reactor, and insulating layer (VI) is wrapped in outside main reactor (II), and full of guarantor in insulating layer (VI) Warm layer recirculated water (L5), the temperature of insulating layer recirculated water (L5) control heating rod (7) by temperature control system (1) and realize tune Section, and realized and recycled by insulating layer water circulating pump (P2), water distributing plate (6) is arranged in main reactor (II) bottom, water distributing plate (6) On trepanning ratio be 1:5, and it is equipped with gauze above in water distributing plate (6), for preventing congestion situations, main reactor (II) Middle and upper part is equipped with the inclined plate separator (8) that two-stage inclined plate is constituted, and swash plate angle is 55 degree, realizes that solid-liquid efficiently separates, anaerobism Sludge comes back to reaction zone；Main reactor (II) is with regulating tank (III) and membrane cisterna (IV) by link slot (V) in main reactor (II) top connects, and inclination angle is 55 degree, is used for floating sludge settling waterborne, and prevent channel block from reactor being caused to run Failure；It is prevented big for sludge further to be precipitated to separation afterwards, before membrane cisterna (IV) equipped with regulating tank (III) in link slot (V) Particulate matter flows into membrane cisterna (IV) and causes the quick pollution of membrane module (3), while can also prevent from disturbing caused by aeration in membrane cisterna (IV) The dynamic sedimentation effect for influencing link slot (V)；It is arranged with aeration item (2) in membrane module (3), anaerobic reaction aerogenesis (G1) passes through Air pump (P3) carries out aeration to membrane module (3) and washes away, and controls aeration intensity by gas flowmeter (9), overcomes anaerobic reaction The limitation of aeration cannot be used；It is equipped with pressure sensor (11) on filter pipe to connect with filtering control system (5), when pipeline pressure Power is more than automatic cut-off system after setting value；Filtering control system (5) is controlled by controlling the opening and closing of four solenoid valves (12) Membrane cisterna (IV) is flowed back in film water outlet (L2) discharge and water outlet (L3) again, realizes the case where not changing filter pump (P5) rotation direction Lower completion filtering and backwash, extend the service life of membrane module (3) and filter pump (P5).