CN202089817U - Purifying device of air lifted type external tubular membrane bioreactor - Google Patents

Abstract

The utility model relates to an air-lift type external tubular membrane bioreactor purification device, which relates to a tubular membrane bioreactor for organic wastewater treatment and reuse; it includes a bioreactor (P1), a water supply pump (P2), and a circulation pump (P3) , Tubular membrane module (P4), air distributor (P5), air compressor (P6), backwash pump (P7), dosing pump (P8) and multiple sets of pneumatic valves (V1, V2...V8); Tubular membrane assembly (P4) is a vertical cylinder-shaped shell (5) plus, the lower head (6, 7) is sealed with the upper and lower seals (8, 9) as a whole; the utility model utilizes compression The air gas will enter the mixed liquid in the membrane module, and the membrane surface flow velocity of the membrane tube (10) reaches 1-3 m/s, and its power consumption can be reduced to 0.2-0.3 kWh/ton of water, which is only equivalent to that of a general large One-tenth of the cross-flow, and the water production rate can reach 90-110L/m ² h, which is 10 times that of the submerged hollow fiber membrane.

Description

Air lift type external tubular membrane bioreactor purification device

Technical field:

The utility model relates to a tubular membrane biological reaction device for organic waste water treatment and reuse. the

Background technique:

Most of the current membrane bioreactors use "submerged hollow fiber membrane module" membrane module placed in the biochemical pool, adopt suction filtration, through self-priming pump or vacuum suction, the source water passes through the hollow fiber membrane to achieve solid-liquid Separation and purification, due to the small control of the suction working variable, only 8-12L/m2·h, the flow rate is relatively low, and because the membrane module is immersed in the sewage with a large number of microorganisms for a long time, there is a risk of biological pollution, chemical cleaning It can only be done offline, which is not conducive to large-scale continuous and stable operation, and the life of the membrane module is short, generally only 1-2 years. the

The general external membrane bioreactor is to place the membrane device outside the biochemical pool. The raw water in the biochemical pool is connected to the membrane device and the biochemical pool through the feed water pump and the circulation pump. The permeate is sent to the clear water tank, and the concentrated water is returned to the biochemical tank, because the mixed liquid in the biochemical tank has a high concentration of suspended solids. In order to prevent fouling of membrane modules, this external membrane bioreactor must adopt a large cross-flow form for solid-liquid separation. In order to achieve a filtration speed of 1-3 meters per second, the ratio of circulating water to produced water is usually 10:1. , that is, to produce 1 ton of permeate, 10 tons of raw water circulation is required. The power consumption of this large cross-flow usually reaches 3-5 kWh/ton of water, which is obviously high energy consumption. the

Invention content:

The purpose of the utility model is to provide an air lift type external tubular membrane bioreactor purification device. the

It includes bioreactor (P1), feed water pump (P2), circulation pump (P3), tubular membrane module (P4), air distributor (P5), air compressor (P6), backwash pump (P7), The dosing pump (P8) and multiple sets of pneumatic valves (V1, V2...V8); the biologically treated water in the bioreactor (P1) enters the circulation pump (P3) sequentially through the feed water pump (P2), and the pneumatic valves ( V1), water inlet (1), water distribution hole (13), membrane tube (10), water production port (4), pneumatic valve (V8) to the clean water pool; water/air outlet (3) is connected to the pneumatic valve (V6) in sequence ), the bioreactor (P1) to the emptying device; the water inlet (1) is sequentially connected to the pneumatic valve (V5), the backwash sewage pipe, and the bioreactor (P1); the air is compressed by the air compressor (P6) all the way to the pneumatic The valve (V2), the air inlet (2) of the tubular membrane module (P4), all the way to the pneumatic valve (V4), the pneumatic valves (V3, V7, V8) to the water outlet (4); Washing pump (P7), pneumatic valve (V3); dosing box connects dosing pump (P8) to pneumatic valve (V7) in turn. the

The tubular membrane module (P4) is a vertical cylindrical shell (5) plus the lower head (6, 7) sealed with the upper and lower seals (8, 9) as a whole; the upper head (6) Water production outlet (4) and water outlet/air outlet (3) are set; water inlet (1) and air inlet (2) are set on the lower head (7); air distribution plate (15), Air distribution holes (14) and membrane tubes (10), several water distribution/air distribution holes (12) and water distribution holes (13) are arranged horizontally, and plugs (11) are arranged in the middle. the

The membrane tube (10) is composed of a base film and a surface film; the base film is sintered from ultra-high molecular weight polyethylene prepared by a sintering method, and the surface film is polyvinylidene fluoride. the

The bottom of the tubular membrane module (P4) is equipped with an air distributor (P5) sintered with ultra-high molecular weight polyethylene material. the

The utility model utilizes compressed air gas to make the mixed solution entering the membrane module reach a flow rate of 1-3 m/s on the membrane surface of the membrane tube (10), and its power consumption can be reduced to 0.2-0.3 kWh/ton of water. The consumption is only equivalent to one tenth of the general large cross flow, and the water production can reach 90-110L/m2h, which is 10 times that of the submerged hollow fiber membrane. the

Description of drawings:

Accompanying drawing 1 is the front sectional view of tubular membrane assembly of the present utility model;

Accompanying drawing 2 is the A-A to sectional view of Fig. 1 of the present utility model:

Accompanying drawing 3 is the system structural diagram of the present utility model;

Accompanying drawing 4 is the parameter list of tubular membrane module of the present utility model. the

Detailed ways:

The utility model includes a bioreactor (P1), a feed water pump (P2), a circulation pump (P3), a tubular membrane module (P4), an air distributor (P5), an air compressor (P6), a backwash pump (P7 ), dosing pump (P8) and multiple sets of pneumatic valves (V1, V2...V8); the biologically treated water in the bioreactor (P1) passes through the feed water pump (P2)→circulation pump (P3)→pneumatic valve (V1)→Water inlet (1)→Water distribution hole (13)→Membrane tube (10)→Water production port (4)→Pneumatic valve (V8)→Clear water pool; water/air outlet (3)→Pneumatic valve (V6 )→bioreactor (P1), emptying device; water inlet (1)→pneumatic valve (V5)→backwash sewage pipe→bioreactor (P1); air compressed by air compressor (P6) all the way→pneumatic valve (V2)→air inlet (2) of tubular membrane module (P4), one way→pneumatic valve (V4)→pneumatic valve (V3, V7, V8)→product water outlet (4); clean water tank→backwash pump (P7)→pneumatic valve (V3); dosing box→dosing pump (P8)→pneumatic valve (V7); tubular membrane module (P4) is a vertical drum-shaped shell (5) plus and bottom The sealing heads (6, 7) are sealed as a whole with upper and lower seals (8, 9); the upper sealing head (6) is provided with the water production outlet (4) and the water outlet/air outlet (3); the lower sealing head (7) is provided with Water inlet (1) and air inlet (2); air distribution plate (15), air distribution hole (14) and membrane tube (10) are arranged longitudinally in the casing (5), and several water distribution/air distribution holes (12) are arranged horizontally With water distribution hole (13), plug (11) is set in the middle. The membrane tube (10) is composed of a base film and a surface film; the base film is sintered from ultra-high molecular weight polyethylene prepared by a sintering method, and the surface film is polyvinylidene fluoride. The bottom of the tubular membrane module (P4) is equipped with an air distributor (P5) sintered with ultra-high molecular weight polyethylene material. the

The base film and the surface film form a firm combination, so that the film tube (10) can withstand a relatively high backwash pressure (0.5MPa). At the same time, the above two materials have the ability to resist strong oxidation, strong acid and strong alkali. Combining the above advantages, the membrane tube (1) is conducive to rapid online cleaning, so that it can always maintain continuous and stable operation in the filtration of high-concentration and high-viscosity water bodies. the

Formation of air lift of tubular membrane module (P4) and gas supply volume: The design of the air distributor (P5) must be determined according to the packing density of the inner membrane tube of the tubular membrane. The formed air bubbles are not as small as possible, and the air bubbles must be able to properly scrub between the gaps of the membrane tubes (10). The gas supply rate of each tubular membrane module (P4) is 0-20Nm3/h; the gas stripping pressure is preferably <0.05MPa. the

Working status of tubular membrane module (P4):

1. Filtering:

During filtration, the feed water pump (2) sends the mixed liquid in the biochemical reactor (1) into the tubular membrane module (P4), and the feed water pump (P2) is used to maintain a constant feed water flow rate, which is passed through the circulation pump (P3) Increase the flow rate from the bottom of the tubular membrane module (P4) to the top; the compressed air is compressed by the air compressor (P6) and sent to the cavity of the tubular membrane module (P4) evenly through the air distributor (P5) at the bottom . Driven by the rise of the air, the mixed liquid and suspended solids rise to maintain a certain flow rate (1-3m/s) on the surface of the membrane tube (10), and the air stirs and scrubs the surface of the membrane, taking away the suspended particles that are likely to cause membrane fouling and clogging And colloid, the mixed liquid flows in the form of cross flow, the particles and solutes larger than the membrane pores are trapped on the surface of the membrane, and the particles smaller than the membrane pores pass through the membrane wall to purify the water and realize the solid-liquid separation. The purified product water enters the clear water pool through the product water outlet (4) and the pneumatic valve (V8). Due to the cross-flow filtration, the concentrated water returns to the biochemical reactor (P1) through the pneumatic valve (V6), so that the sludge concentration in the biochemical reactor (P1) increases continuously, which is beneficial to further degrade the refractory organic matter, thereby improving the biochemical Effect; the air is evacuated through the evacuation line. the

2. Backwashing:

During the operation of the equipment, sludge accumulates in the inner cavity of the tubular membrane module (P4), the surface of the membrane tube (10) and in the membrane holes, in order to maintain the normal operation of the system. These contaminants must be removed periodically by backwashing. the

During the backwashing process, the air compressor (P6) is turned on, the oil-free compressed air passes through the pneumatic valve (V4), and the product water outlet (4) enters the cavity of the tubular membrane module (P4) from the opposite direction of the membrane filtration, and the opposite direction The punching force is 0.5MPa, and the continuous pulse backwashing is 2-3 times, each time is 2-3 seconds. After gas recoil, turn on the backwash pump (P7) to backwash with the product water in the clear water tank for 1-2min. The process is: the backwash pump (P7) pumps water from the clear water tank and enters the tubular membrane from the product water outlet (4) The cavity of the component (P4) flows out from the water inlet (1), and returns to the biochemical reactor (P1) through the backwash sewage pipe. After 15-20 cycles of normal air backwashing and water backwashing, enhanced backwashing is required, that is, in water backwashing, the tubular membrane module (P4) is subjected to 10- 15min of soaking and washing. Generally, during 30-45 days, the tubular membrane module (P4) needs to be thoroughly chemically cleaned to restore the original flux of the tubular membrane module (P4). the

Claims (4)

1. the external tubular membrane bio-reactor of gas stripping type refining plant, it comprises bio-reactor (P1), service pump (P2), recycle pump (P3), tubular membrane component (P4), gas pipe (P5), air compressor (P6), backwashing pump (P7), dosing pump (P8) and many group operated pneumatic valve (V1, V2 ... V8), it is characterized in that: the water in the bio-reactor (P1) after biological treatment enters recycle pump (P3) successively through service pump (P2), operated pneumatic valve (V1), water-in (1), water distributing pore (13), film pipe (10), produce the mouth of a river (4), operated pneumatic valve (V8) is to clean water basin; Water outlet/air outlet (3) connects operated pneumatic valve (V6) successively, and bio-reactor (P1) is to emptier; Water-in (1) connects operated pneumatic valve (V5) successively, backwash blow-off pipe, bio-reactor (P1); Air arrives operated pneumatic valve (V2) through air compressor (P6) compression one tunnel, the inlet mouth (2) of tubular membrane component (P4), and one the road to operated pneumatic valve (V4), and operated pneumatic valve (V3, V7, V8) is to producing water out (4); Clean water basin connect backwashing pump (P7) successively, operated pneumatic valve (V3); Dosing tank connects dosing pump (P8) successively to operated pneumatic valve (V7).

2. the external tubular membrane bio-reactor of gas stripping type as claimed in claim 1 refining plant is characterized in that: tubular membrane component (P4) is that a vertical drum shape shell (5) adds, lower cover (6,7) is used, lower seal (8,9) sealed whole; Upper cover (6) is provided with and produces water out (4) and water outlet/air outlet (3); Lower cover (7) is provided with water-in (1) and inlet mouth (2); Air distribution plate (15), qi-emitting hole (14) and film pipe (10) vertically are set in the shell (5), some water distribution/qi-emitting holes of arranged transversely (12) and water distributing pore (13), the centre is provided with plug (11).

3. the external tubular membrane bio-reactor of gas stripping type as claimed in claim 1 or 2 refining plant, it is characterized in that: film pipe (10) is made up of basement membrane and pellicle; Basement membrane is formed by the ultrahigh molecular weight polyethylene(UHMWPE) sintering of sintering process preparation, and pellicle is a polyvinylidene difluoride (PVDF).

4. the external tubular membrane bio-reactor of gas stripping type as claimed in claim 1 or 2 refining plant is characterized in that: a gas pipe with the superhigh molecular weight polyethylene material sinter molding (P5) is equipped with in tubular membrane component (P4) bottom.

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