CN102260023A - Apparatus for treating domestic sewage by utilizing anaerobic expanded granular sludge bed - Google Patents

Abstract

The utility model relates to a device for treating domestic sewage by using an anaerobic expanded granular sludge bed, which relates to a device for treating domestic sewage. It is aimed at solving the problems that the current anaerobic treatment of sewage requires a long cycle for biomass, aerobic treatment is required to meet the discharge requirements, the degradation rate is low under low temperature conditions, and odor and corrosive substances are produced. The water inlet tank is connected to the bottom of the outer cylinder containing sludge and granular activated carbon, the bottom end of the upper cylinder is fixedly connected to the upper end of the outer cylinder containing sludge and granular activated carbon, and a hollow fiber is installed in the inner cylinder containing granular activated carbon. The small-diameter end of the first frustum-shaped tube communicates with the middle tube, the second truncated-shaped tube is arranged outside the first truncated-shaped tube, the large-diameter end of the second truncated-shaped tube is fixedly connected to the inner wall of the upper tube, and the hollow fiber The upper end of the membrane communicates with the membrane module through the first water outlet pump, the upper end of the upper cylinder and the upper end of the membrane module communicate with the gas collecting bottle, and the membrane module communicates with the water outlet tank through the second water outlet pump. The invention is used for treating domestic sewage.

Description

A device for treating domestic sewage using anaerobic expanded granular sludge bed

technical field

The invention relates to a device for treating domestic sewage.

Background technique

At present, the treatment methods of domestic sewage in my country and other countries in the world mainly adopt aerobic treatment (such as activated sludge process, etc.) and anaerobic treatment (such as USAB, etc.). Although they can achieve better treatment effects, there are still many problems.

Problems in aerobic treatment: 1. High energy consumption: the aerobic method needs to oxygenate the sewage, which consumes a lot of electricity. It is estimated that a sewage plant using the traditional activated sludge method consumes 75% of the total operating cost in In terms of electric energy, both economically and energy-saving burdens are heavy; 2. High sludge production: the production rate of aerobic microorganisms is generally as high as 0.2-0.6kgVSS/kgCOD, so sludge needs to be dehydrated, safely landfilled or Subsequent treatment such as incineration increases the cost of sewage treatment; 3. Adding organic carbon source: For some wastewater with insufficient carbon source, additional carbon source is required, which increases the operation and management costs; 4. Inconvenient management: the basis of aerobic process The investment is large, and the operation and management are inconvenient, so it is not suitable for the development of relatively backward urban and rural applications;

Problems in anaerobic treatment: 1. It takes a long time to achieve the ideal biomass; 2. It is often necessary to further meet the emission requirements through aerobic treatment; 3. The degradation rate is low under low temperature conditions; 4. Odor and corrosion sexual substance.

Contents of the invention

The purpose of the present invention is to provide a device that uses anaerobic expanded granular sludge bed to treat domestic sewage, so as to solve the problem that the current anaerobic treatment of sewage requires a long period of biomass, needs to meet the discharge requirements through aerobic treatment, and degrades under low temperature conditions. The rate is low and the problem of producing odor and corrosive substances.

The technical scheme adopted by the present invention to solve the above technical problems is: the device for treating domestic sewage includes a water inlet tank, a water inlet pump, a return pump, a first water outlet pump, a gas collecting bottle, a membrane module, a second water outlet pump, and a water outlet tank , the device for treating domestic sewage also includes a reactor, the reactor includes an outer cylinder with sludge and granular activated carbon, a middle cylinder, an inner cylinder with granular activated carbon, a hollow fiber membrane and a three-phase separator, and the three-phase separation The device is composed of the first frustum-shaped cylinder and the second frustum-shaped cylinder. The outlet of the water inlet tank is connected to the bottom of the outer cylinder containing sludge and granular activated carbon through the water inlet pump and the return pump in turn. There is a row of sampling ports on the side wall of the outer cylinder, the bottom of the upper cylinder is fixedly connected to the upper end of the outer cylinder containing sludge and granular activated carbon, and the middle cylinder is set in the outer cylinder containing sludge and granular activated carbon. The inner cylinder with granular activated carbon is set in the middle cylinder, and the inner cylinder with granular activated carbon is provided with a hollow fiber membrane. The small diameter end of the first frustum-shaped cylinder communicates with the middle cylinder, and the second The distance between the outside of the tube and the outer edge of the large diameter end of the first truncated cone tube and the inner wall at the corresponding position of the second truncated cone tube is 1-3mm, and the large diameter end of the second truncated cone tube and the inner wall of the upper tube Fixed connection, and the distance between the outer edge of the large diameter end of the second conical cylinder and the inner wall at the corresponding position of the upper cylinder is 4-6mm, the upper end of the hollow fiber membrane communicates with the membrane module through the first water outlet pump, and the upper Both the upper end of the barrel and the upper end of the membrane module are connected with the gas collecting bottle, the membrane module is connected with the water outlet tank through the second outlet pump, and the upper end of the inner cylinder filled with granular activated carbon is closed.

The present invention has the following beneficial effects: 1. Compared with traditional aerobic technology, this technology saves at least 70% of oxygen consumption; 2. Compared with traditional anaerobic technology, this technology does not need further aerobic treatment to achieve Emission requirements, the removal rate of organic matter can be increased by 20%-30%; 3. This technology can convert organic matter into methane to the maximum, and the degradation rate is high, so as to realize energy conversion and greatly alleviate the current energy shortage situation; 4. By optimizing operating parameters The hydraulic retention time can be shortened, thereby improving the treatment efficiency, the cycle is short and no odor and corrosive substances are produced.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention, and Fig. 2 is a schematic diagram of the structure of a three-phase separator.

Detailed ways

Specific Embodiment 1: This embodiment is described in conjunction with FIG. 1 and FIG. 2. The device for treating domestic sewage in this embodiment includes a water inlet tank 1, a water inlet pump 2, a return pump 3, a first water outlet pump 4, a gas collecting bottle 5, Membrane module 6, second water outlet pump 7, water outlet tank 8, characterized in that: the device for treating domestic sewage also includes a reactor 9, and the reactor 9 includes an outer cylinder 10 and a middle cylinder 11 filled with sludge and granular activated carbon , the inner cylinder 12 that granular activated carbon is housed, the hollow fiber membrane 13, the three-phase separator 14 and the upper cylinder 17, the three-phase separator 14 is made of the first conical cylinder 15 and the second conical cylinder 16, and the water inlet tank 1 The water outlet of the water outlet is communicated with the bottom of the outer cylinder 10 containing sludge and granular activated carbon successively through the water inlet pump 2 and the return pump 3, and a row of sampling ports 10- 1. The bottom end of the upper cylinder 17 is fixedly connected to the upper end of the outer cylinder 10 containing sludge and granular activated carbon, the middle cylinder 11 is set in the outer cylinder 10 containing sludge and granular activated carbon, and the inner cylinder equipped with granular activated carbon 12 is located in the middle tube 11, the inner tube 12 containing granular activated carbon is provided with a hollow fiber membrane 13, the small diameter end of the first truncated cone-shaped tube 15 communicates with the middle tube 11, and the second truncated circular tube 16 is arranged on the first The distance between the outside of the frustum-shaped tube 15 and the outer edge of the large-diameter end of the first truncated-conical tube 15 and the inner wall at the corresponding position of the second truncated-conical tube 16 is 1-3mm, and the large-diameter of the second truncated-conical tube 16 The end is affixed to the inner wall of the upper cylinder 17, and the distance between the outer edge of the large-diameter end of the second conical tube 16 and the inner wall at the corresponding position of the upper cylinder 17 is 4-6mm, and the upper end of the hollow fiber membrane 13 passes through The first water outlet pump 4 communicates with the membrane module 6, the upper end of the upper cylinder 17 and the upper end of the membrane module 6 communicate with the gas collecting bottle 5, the membrane module 6 communicates with the water outlet tank 8 through the second water outlet pump 7, and the granular activated carbon is housed. The upper end of the inner cylinder 12 is closed.

Embodiment 2: This embodiment is described with reference to FIG. 1 . In this embodiment, the upper cylinder 17 communicates with the water inlet tank 1 through the water inlet pump 2 . This structure is used to control the water inlet flow rate of the outer cylinder. Other components and connections are the same as those in the first embodiment.

Specific Embodiment 3: This embodiment is described with reference to FIG. 1 . The membrane module 6 of this embodiment is a PE hollow fiber membrane. The membrane module is used to intercept granular activated carbon, sludge and macromolecular organic matter. Other components and connections are the same as those in the first embodiment.

Specific Embodiment Four: This embodiment is described in conjunction with Fig. 1, the device of this embodiment also includes a pressure sensor 18, the pressure sensor 18 is arranged between the membrane assembly 6 and the second water outlet pump 7, and the pressure sensor is used to measure the transmembrane pressure . Other components and connections are the same as those in the first embodiment.

Working principle: Sewage enters the outer cylinder 10 containing sludge and granular activated carbon in the reactor 9 from the water inlet tank 1 through the water inlet pump 2 and the return pump 3, forming an upflow expanded granular sludge bed, microorganisms and organic matter in the sewage Fully contact to degrade organic matter. After passing through the three-phase separator 14, the decomposed gaseous methane and treated water are separated from the sludge in three phases. Part of the treated water enters the middle cylinder 11 and flows downward, while the other part passes through the backflow The sludge enters the inner cylinder 12 filled with granular activated carbon, and the sludge flows back into the outer cylinder 10 filled with sludge and granular activated carbon. When the effluent flows into the inner cylinder 12 equipped with granular activated carbon, the membrane pollution is further reduced by the adsorption of granular activated carbon. , the outlet water is extracted from the hollow fiber membrane 13 by the action of the first outlet pump 4 to achieve further purification, and then enters the outlet water tank 8 through the membrane module 6 .

Claims (4)

1. device that utilizes anaerobic expanded granular sludge bed processing sanitary sewage; the device of described processing sanitary sewage comprises inlet chest (1); intake pump (2); reflux pump (3); first goes out water pump (4); air collector (5); membrane module (6); second goes out water pump (7); water tank (8); it is characterized in that: the device of described processing sanitary sewage also comprises reactor (9); reactor (9) comprises the urceolus (10) that mud and granulated active carbon are housed; middle tube (11); the inner core (12) of granulated active carbon is housed; hollow-fibre membrane (13); triphase separator (14) and top cylinder (17); triphase separator (14) is made of the first truncated cone-shaped tube (15) and the second truncated cone-shaped tube (16); the water outlet of inlet chest (1) is communicated with the bottom of the urceolus that mud and granulated active carbon are housed (10) by intake pump (2) and reflux pump (3) successively; the sidewall that the urceolus (10) of mud and granulated active carbon is housed is provided with a row thief hatch (10-1); the bottom of top cylinder (17) is affixed with the upper end of the urceolus (10) that mud and granulated active carbon are housed; middle tube (11) is located in the urceolus (10) that mud and granulated active carbon are housed; the inner core (12) that granulated active carbon is housed is located in the middle tube (11); be equipped with in the inner core (12) of granulated active carbon and be provided with hollow-fibre membrane (13); the smaller diameter end of the first truncated cone-shaped tube (15) is communicated with middle tube (11); the distance that the second truncated cone-shaped tube (16) is located between the inwall at the outward flange of larger diameter end of the outside and first truncated cone-shaped tube (15) of the first truncated cone-shaped tube (15) and second truncated cone-shaped tube (16) the opposite position place is 1-3mm; the inwall of the larger diameter end of the second truncated cone-shaped tube (16) and top cylinder (17) is affixed; and the outward flange of the larger diameter end of the second truncated cone-shaped tube (16) and top cylinder (17) opposite position place inwall between distance be 4-6mm; the upper end of hollow-fibre membrane (13) goes out water pump (4) by first and is communicated with membrane module (6); the upper end of the upper end of top cylinder (17) and membrane module (6) all is communicated with air collector (5); membrane module (6) goes out water pump (7) by second and is communicated with water tank (8), and the upper end closed of the inner core (12) of granulated active carbon is housed.

2. according to the described a kind of device that utilizes anaerobic expanded granular sludge bed processing sanitary sewage of claim 1, it is characterized in that top cylinder (17) is communicated with inlet chest (1) by intake pump (2).

3. according to claim 1 or 2 described a kind of devices that utilize anaerobic expanded granular sludge bed processing sanitary sewage, it is characterized in that membrane module (6) is the PE hollow-fibre membrane.

4. according to the described a kind of device that utilizes anaerobic expanded granular sludge bed processing sanitary sewage of claim 3, it is characterized in that described device also comprises pressure transmitter (18), pressure transmitter (18) is arranged on membrane module (6) and second and goes out between the water pump (7).

Images