CN205740643U - A kind of external cross-flow ultrafiltration membrane system - Google Patents

Abstract

The utility model provides an external cross-flow ultrafiltration membrane system. The external cross-flow ultrafiltration membrane system of the utility model includes an anaerobic tank, a diatomite dosing device and a tubular membrane module. The tubular membrane module is equipped with a number of ceramic internal pressure tubular ultrafiltration membranes. The water outlet of the anaerobic tank is connected to the water inlet of the ceramic internal pressure tubular ultrafiltration membrane, and the water outlet of the diatomite dosing device is connected to the water inlet of the ceramic internal pressure tubular ultrafiltration membrane. Compared with the prior art, when the external cross-flow ultrafiltration membrane system of the present invention is in operation, since a certain amount of diatomaceous earth is added to the mixed solution, the erosion of the inner wall of the ceramic internal pressure tubular ultrafiltration membrane can be strengthened , cleaning effect, can effectively reduce the deposition and pollution of impurities on the inner wall of the ceramic internal pressure tubular ultrafiltration membrane, stabilize the permeation flux, and at the same time reduce the flow rate of cross flow, save energy consumption, and prolong the life of the ceramic internal pressure tubular ultrafiltration membrane. The filter cycle reduces the frequency of chemical cleaning.

Description

An external cross-flow ultrafiltration membrane system

technical field

The utility model relates to the field of wastewater treatment, in particular to an external cross-flow ultrafiltration membrane system.

Background technique

Anaerobic biological reaction is a conventional process in sewage treatment. It has the advantages of small footprint, simple process, low energy consumption, low sludge output, and can degrade some refractory organic pollutants. Biogas can be used as energy regeneration and is a treatment technology with multiple advantages of environmental and economic benefits. Therefore, it is widely used in the field of wastewater treatment, especially the wastewater treatment of higher concentrations of organic pollutants.

The external anaerobic membrane bioreactor is one of the current anaerobic membrane bioreactors. Specifically, the anaerobic treatment effluent is led out of the reaction tank, and enters the membrane tube through internal pressure for high-speed cross-flow filtration, and the filtered water seeps out of the membrane tube. The activated sludge and concentrated solution remain in the membrane tube, and then return to the reaction tank. . The advantages of this technology are high processing throughput and compact equipment. However, there are the following drawbacks:

In the process of cleaning the membrane tube, high-speed water flow is required to continue washing for a period of time, which consumes a lot of energy, and can only wash away the large impurities on the tube wall, but the small impurities in the membrane holes cannot be washed away. After a long time, It will block the membrane pores, thereby affecting the filtration effect and filtration efficiency of the membrane tube, and even affecting the service life of the membrane tube.

Utility model content

The utility model provides an external cross-flow ultrafiltration membrane system to solve the problem that the external anaerobic membrane bioreactor in the prior art needs high-speed water flow to continue washing for a period of time during the process of cleaning the membrane tube, and the energy consumption Large, and can only wash away the large impurities on the tube wall, but the small impurities in the membrane pores cannot be washed away. After a long time, the membrane pores will be blocked, thereby affecting the filtration effect and filtration efficiency of the membrane tube, and even Technical issues that affect the service life of membrane tubes.

The purpose of this utility model is achieved by the following technical solutions:

A tubular ultrafiltration membrane is characterized in that it comprises an anaerobic tank, a diatomaceous earth dosing device and a tubular membrane module, wherein several ceramic internal pressure tubular ultrafiltration membranes are arranged in the tubular membrane module, and the The water outlet of the anaerobic tank is connected to the water inlet of the ceramic internal pressure tubular ultrafiltration membrane, and the water outlet of the diatomite dosing device is connected to the water inlet of the ceramic internal pressure tubular ultrafiltration membrane.

A backwash pump is also included, and the backwash pump is connected with the tubular membrane module.

The inside of the anaerobic tank consists of a water inlet area, a packing area, a water outlet area and a biogas collection area from bottom to top. A water inlet is provided on the side wall of the water inlet area. A water distributor with stirring function, the water outlet is arranged on the side wall of the water outlet area, and the biogas collection area is provided with an exhaust port.

The system also includes a supply device, a chemical cleaning water tank, a produced water tank and a biochemical reactor, and a backwash pump and a tubular membrane module are installed between the produced water tank and the biochemical reactor.

The chemical cleaning water tank is connected to the biochemical reactor through pipelines, and the produced water tank is connected to the tubular membrane module through pipelines.

Compared with the prior art, the utility model has at least the following advantages:

When the external cross-flow ultrafiltration membrane system of the utility model is in operation, since a certain amount of diatomaceous earth is added to the mixed solution, the scouring and cleaning effect on the inner wall of the ceramic internal pressure tubular ultrafiltration membrane can be strengthened, which can effectively reduce Impurities are deposited and polluted on the inner wall of the ceramic internal pressure tubular ultrafiltration membrane, stabilizing the permeation flux, reducing the flow rate of cross flow, saving energy consumption, prolonging the filtration cycle of the ceramic internal pressure tubular ultrafiltration membrane, and reducing chemical cleaning frequency. In addition, the filtration effect and filtration efficiency of the ceramic internal pressure tubular ultrafiltration membrane can also be improved, thereby prolonging the service life of the ceramic internal pressure tubular ultrafiltration membrane.

Description of drawings

Fig. 1 is the structural representation of the external cross-flow ultrafiltration membrane system of the present utility model;

Fig. 2 is a schematic structural diagram of another external cross-flow ultrafiltration membrane system in an embodiment of the present invention.

detailed description

The technical solution in the utility model will be clearly and completely described below in conjunction with the accompanying drawings of the utility model. Apparently, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Figure 1-2, it is an external cross-flow ultrafiltration membrane system proposed by the embodiment of the utility model, including anaerobic tank 1, diatomite dosing device 2 and tubular membrane module 8, tubular membrane There are several ceramic internal pressure tubular ultrafiltration membranes 4 inside the module 8, the water outlet of the anaerobic tank 1 is connected to the water inlet of the ceramic internal pressure tubular ultrafiltration membrane 4, and the water outlet of the diatomite dosing device 2 is connected to the ceramic The water inlet of the internal pressure tubular ultrafiltration membrane 4 is connected. Among them, the anaerobic tank 1 is sequentially divided into a water inlet area, a filler area, a water outlet area and a biogas collection area from bottom to top, and a water inlet is provided on the side wall of the water inlet area. For the water distributor with stirring function, the water outlet is set on the side wall of the water outlet area, and the biogas collection area is equipped with an exhaust port.

The diatomite dosing device 2 is used to add diatomite to the wastewater before ceramic internal pressure tubular ultrafiltration membrane filtration, so that the content of diatomite in the wastewater is 5g/L-20g/L, preferably 10g/L L.

The external cross-flow ultrafiltration membrane system of the present invention also includes a backwash pump 3 for backwashing the ceramic internal pressure tubular ultrafiltration membrane, and the backwash pump 3 is connected with the tubular membrane module 8 .

Preferably, the system also includes a supply device (not shown in the figure), a chemical cleaning water tank 5, a product water tank 6 and a biochemical reactor 7, and the backwash pump 3 and the tubular membrane module 8 are installed in the product water tank and the biochemical reactor between.

Preferably, the chemical cleaning water tank 5 is connected to the biochemical reactor 7 through pipelines, and the water production tank 6 is connected to the tubular membrane module 8 through pipelines.

Below in conjunction with the accompanying drawings, the wastewater purification process of the external cross-flow ultrafiltration membrane system of the present invention, the detailed steps are as follows:

(1) The waste water to be treated enters the anaerobic pool 1, contacts the sludge through the water distributor in the water inlet area, and then slowly passes through the packing area, where the waste water in the packing area is absorbed and degraded by the anaerobic sludge to generate biogas, and then, Waste water enters the water outlet area, and the generated biogas enters the biogas collection area. The biogas in the biogas collection area is exported from the exhaust port and collected into the biogas collection tank through the intake pipe;

(2) The waste water in the outlet area enters the ceramic internal pressure tubular ultrafiltration membrane 4 after being filtered by a fine grid, and at the same time, the diatomite in the diatomite dosing device 2 also enters the ceramic internal pressure tubular ultrafiltration membrane, Make the content of diatomite in the waste water before filtering be 5g/L-20g/L, be preferably 10g/L;

(3) Under the action of pressure difference, the clear water permeates outward through the ceramic internal pressure tubular ultrafiltration membrane and is exported, collected in the clear water pool, and the concentrated mixed solution left in the ceramic internal pressure tubular ultrafiltration membrane is cross-flowed brought back to the anaerobic pond;

(4) After the ceramic internal pressure tubular ultrafiltration membrane runs for 20-60 minutes (preferably 30 minutes), the clear water (or tap water) in the clear water tank is introduced into the tubular membrane group through the backwash pump 3 to exert pressure on the ceramic internal pressure. The tubular ultrafiltration membrane is backwashed for 30-60s; the clear water in the clear water tank can also be used to supply water to the subsequent treatment process.

The working principle of this system is described as follows in conjunction with the accompanying drawings:

At room temperature, with a certain pressure and flow rate, using an asymmetric microporous structure and a semi-permeable membrane medium, relying on the pressure difference on both sides of the membrane as the driving force, filter in a cross-flow manner to allow solvents and small molecular substances to pass through, and macromolecular substances to pass through. It is a new type of membrane separation technology for separation, fractionation, purification, and concentration of microparticles such as proteins, water-soluble polymers, and bacteria that are retained by the filter membrane. The intercepting area of the raw liquid flow channel is large, and it is not easy to be blocked; the cleaning of the membrane surface is relatively easy, and can be chemically cleaned or scrubbed.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, and any person familiar with the technical field can easily think of All changes or replacements should fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (3)

1. an external cross-flow ultrafiltration membrane system, it is characterized in that, including anaerobic pond, kieselguhr throwing device and tubular membrane component, the intrinsic pressure tubular ultra-filtration membrane of some potteries it is provided with in described tubular membrane component, the water inlet of the outlet of described anaerobic pond tubular ultra-filtration membrane intrinsic pressure with described pottery is connected, and the water inlet of the outlet tubular ultra-filtration membrane intrinsic pressure with described pottery of described kieselguhr throwing device is connected；

Wherein, this system also includes feedway, Chemical cleaning water tank, produces water tank and biochemical reactor, backwashing pump and tubular membrane component are arranged between product water tank and biochemical reactor, described Chemical cleaning water tank connects biochemical reactor by pipeline, and described product water tank is connected with tubular membrane component pipeline.

2. a kind of external cross-flow ultrafiltration membrane system as claimed in claim 1, it is characterised in that also include that backwashing pump, described backwashing pump are connected with described tubular membrane component.

3. a kind of external cross-flow ultrafiltration membrane system as claimed in claim 1, it is characterized in that, inhalant region, packing area, exhalant region and collecting methane district it is followed successively by from down to up in described anaerobic pond, the sidewall of inhalant region is provided with water inlet, the water-locator with sludge agitation function it is provided with in described inhalant region, described outlet is located on the sidewall of exhalant region, and described collecting methane district is provided with air vent.