CN106630129A - High-efficiency aeration system for MBR process membrane unit - Google Patents

Abstract

The invention discloses a high-efficiency aeration system for a membrane unit of an MBR process. The main aeration pipe 1 and the main aeration pipe 2 of the present invention are respectively equipped with electric valves, and the two sides of each group of membrane frames are respectively provided with an air inlet 1 and an air inlet 2, and the main aeration pipe 1 and the membrane frame The main aeration pipe 1 is connected through the air inlet 1, and the main aeration pipe 2 and the aeration main pipe 2 of the membrane rack are connected through the air inlet 2; The gas main pipe is set, and the air inlets of any two adjacent aeration branch pipes are respectively connected with different aeration main pipes of each group of membrane racks to realize staggered air intake; the lower surface of each aeration branch pipe is evenly equipped with aeration holes, each A mud discharge tank is arranged on the lower surface of the tail end of each aeration branch pipe, and the total cross-sectional area of the aeration holes of each aeration branch pipe is greater than twice the cross-sectional area of the mud discharge tank. The present invention realizes the intermittent aeration of the MBR membrane system through the overall design of the main aeration pipe and the membrane frame, improves the aeration efficiency, delays the occurrence of membrane fouling, and prolongs the cycle of chemical cleaning of the membrane system.

Description

A high-efficiency aeration system for MBR process membrane unit

technical field

The invention relates to the technical field of sewage treatment, and more specifically relates to a high-efficiency aeration system used for MBR process membrane units.

Background technique

The traditional MBR technology is a gas purging process using continuous aeration, which can generally be designed with an air volume of 3-5m3/h per curtain. Due to the constant aeration volume and no change in the direction of air bubbles and water flow, the gas purging effect is not good, and even a dead angle of aeration appears. In order to ensure a better gas sweeping effect for the membrane unit, it is necessary to use continuous large-volume aeration to maintain it (close to 5m3/h). This operation mode leads to very high energy consumption of the membrane system.

With the development of MBR technology, more and more pulse aeration methods are used for MBR gas purging, which improves the aeration efficiency and reduces the aeration energy consumption of MBR. The current MBR pulse aeration technology is realized by opening and closing the valve of the main aeration pipe. Therefore, the pulse aeration valve switches frequently, and it is generally required to switch the pipeline once every 1-2 minutes. In this way, the valve wears a lot, and the pipeline is often in a state of pressure, which reduces the service life of the equipment, thereby increasing the later operation cost and maintenance. Work.

The traditional MBR membrane unit aeration generally adopts the perforated aeration method, and the aeration branch pipe uniformly adopts the opening diameter of 3~6mm. When the air flows in the aeration branch pipe, due to the increase in the drag loss of the extension and the difference in the wind pressure of each aeration hole, the air volume of each aeration hole in the aeration branch pipe is very different, resulting in uneven aeration, which ultimately affects To the stable operation of the membrane unit.

In addition, during the aeration process, due to the existence of back pressure, when the blower stops, the hot air will be held in the aeration tube. Over time, the sludge at the aeration orifice will be heated and dried, blocking the orifice, and causing Poor aeration or uneven bubbles. Therefore, it is necessary to design an aeration device that is not clogged or can effectively discharge sludge for the membrane unit.

The efficiency of continuous aeration is not high, and it needs to rely on the large amount of aeration to ensure its effect. There may be aeration dead angles, and the energy consumption and aeration effect cannot be balanced; the traditional pulse aeration requires frequent switching of valves, and the pressure of the pipeline is suppressed, causing equipment failure The perforated aeration method is easy to block the aeration holes, which will lead to uneven or even no aeration in the local area of the membrane module, and the operation of the membrane module is unstable; the aeration holes of the perforated aeration branch pipe adopt a uniform pore size. Due to resistance loss and wind pressure changes, the air volume of each aeration hole is different, and the uneven aeration affects the stable operation of the membrane module.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a high-efficiency aeration system for the membrane unit of the MBR process.

The present invention is a high-efficiency aeration system for the membrane unit of MBR process, which is realized through the following technical scheme, including main aeration pipe 1, main aeration pipe 2, at least two sets of membrane racks, and aeration stems for the membrane racks. Pipe 1, aeration main pipe 2 and multiple aeration branch pipes, the aeration main pipe 1 and aeration main pipe 2 are respectively equipped with electric valves, and the two sides of each group of membrane racks are respectively provided with air inlet 1 and air inlet Two, the aeration main pipe one and the aeration main pipe one of the membrane frame are connected through the air inlet one, and the aeration main pipe two and the aeration main pipe two of the membrane frame are connected through the air inlet two; the multiple The aeration branch pipe is arranged perpendicular to the two aeration main pipes of each group of membrane racks, and the air inlets of any two adjacent aeration branch pipes are respectively connected with different aeration main pipes of each group of membrane racks to realize staggered air intake; Aeration holes are evenly arranged on the lower surface of each aeration branch pipe, and mud discharge grooves are arranged on the lower surface of each aeration branch pipe end. times.

The opening diameter of the aeration hole of each aeration branch pipe is 3-6 mm, the number of openings is 12-20, the height of the mud discharge tank is 2-5 cm, and the inner diameter of the mud discharge tank is 10-15 mm.

The number of openings of the aeration holes of the aeration branch pipe is 15, the diameter of the 5 aeration holes adjacent to the inlet end of the aeration branch pipe is 5 mm, and the diameter of the remaining 10 aeration holes is 4 mm; the mud discharge tank The inner diameter is 10mm and the height is 45mm.

Compared with prior art, the beneficial effect of the present invention is:

A. Through the overall design of the aeration main pipe and the membrane frame, the intermittent aeration of the MBR membrane system is realized, which improves the aeration efficiency, delays the occurrence of membrane fouling, and prolongs the cycle of chemical cleaning of the membrane system.

B. The special design of the membrane frame and the aeration branch pipe ensures the aeration effect while greatly reducing the switching frequency of the aeration valve (guaranteed to switch the pipeline every 5-10 minutes), avoiding the occurrence of pipeline pressure, thereby Ensure the stability of process and equipment operation.

C. Set up a sludge discharge tank at the end of each aeration branch pipe, which solves the problem of sludge blocking the aeration holes and can ensure the uniformity and stability of the aeration system; the cross-sectional area and length design of the sludge discharge tank need to be consistent with The opening diameter and number of the aeration branch pipes match to ensure that the gas will not escape from the sludge discharge tank during normal operation, so as to avoid affecting the aeration effect of the membrane system. (The sludge discharge tank is at the end of the aeration branch pipe, but within the size of the entire membrane frame).

D. According to the flow mode and pressure loss of the gas in the aeration branch pipe, different sizes of apertures are designed in different positions of the aeration branch pipe, which fundamentally solves the problem of uneven aeration and ensures the aeration effect of the system , which makes the membrane module run stably and prolongs the cleaning cycle and service life of the membrane unit.

According to the aeration rate of 3m3/h per curtain, the sludge concentration of the MBR reactor is 6g/L, the water flux is 15L/(m2 h), and the operation mode of water production is 8min and stop is 2min, the MBR system can run stably 15-30 days, there is no need for any water backwash and chemical cleaning during this period.

Description of drawings

Fig. 1 is a top view of the system structure of the present invention;

Fig. 2 is a top view of an independent membrane frame structure;

Fig. 3 is a side view of the aeration branch pipe;

Figure 4 is a bottom view of the aeration branch pipe.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figure 1-3, it includes main aeration pipe 1, main aeration pipe 2 2, at least two sets of membrane racks 3, main aeration pipe 1 6 and main aeration pipe 2 7 of the membrane rack, and multiple aeration Gas branch pipe 8, the main aeration pipe 1 and the main aeration pipe 2 are respectively equipped with electric valves, and the two sides of each membrane frame are respectively provided with an air inlet 5 and an air inlet 4, and the aeration main pipe 1 1 and the main aeration pipe 6 of the membrane frame are connected through the air inlet 1 5, the main aeration pipe 2 2 is connected with the aeration main pipe 2 7 of the membrane frame through the air inlet 2 4, and the multiple aeration branch pipes 8. Two aeration main pipes are arranged perpendicular to each group of membrane racks, and the air inlets of any two adjacent aeration branch pipes are respectively connected with the two aeration main pipes of each group of membrane racks to realize staggered air intake (aeration The branch pipes are arranged staggeredly according to the different air intake directions); the lower surface of each aeration branch pipe is uniformly provided with aeration holes, the lower surface of each aeration branch pipe end is provided with a mud discharge groove 9, and the aeration holes of each aeration branch pipe are opened The total cross-sectional area is greater than twice the cross-sectional area of the mud discharge tank.

The opening diameter of the aeration hole of each aeration branch pipe is 3-6 mm, the number of openings is 12-20, the height of the mud discharge tank is 2-5 cm, and the inner diameter of the mud discharge tank is 10-15 mm.

Specific embodiment: as shown in Figure 4, the number of openings of the aeration branch pipe aeration holes is 15, the 5 aeration holes adjacent to the inlet end of the aeration branch pipe are 5 with a diameter of 5mm, and the remaining 10 aeration holes The diameter of the hole 11 is 4mm; the inner diameter of the mud discharge tank is 10mm, and the height is 45mm. It is used in Shanghai Jinshan industrial sewage MBR project of 50,000 tons/day; Hunan Zhuzhou municipal sewage MBR project of 100,000 tons/day; both adopt the technology of the present invention, and the cumulative operation of the two projects is more than one year. At present, the operation of the MBR system is relatively stable, and Compared with the traditional aeration method, the aeration energy consumption of the MBR system is reduced by 15-30%, which has good promotion and demonstration significance.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the protection scope of the present invention.

Claims (3)

1. A high-efficiency aeration system for MBR process membrane units, characterized in that it includes aeration main pipe one, aeration main pipe two, at least two groups of membrane racks, aeration main pipe one and aeration tubes of membrane racks Air dry pipe 2 and a plurality of aeration branch pipes, the aeration main pipe 1 and aeration main pipe 2 are respectively equipped with electric valves, and the two sides of each group of membrane frames are respectively provided with air inlet 1 and air inlet 2, and the aeration The main pipe 1 and the aeration dry pipe 1 of the membrane frame are connected through the air inlet 1, and the aeration main pipe 2 and the aeration dry pipe 2 of the membrane frame are connected through the air inlet 2. The multiple aeration branch pipes are perpendicular to each The two main aeration pipes of the membrane rack are set, and the air inlets of any two adjacent aeration branch pipes are respectively connected with the two main aeration pipes of each membrane rack to realize staggered air intake; Aeration holes are evenly arranged on the surface, and mud discharge grooves are arranged on the lower surface of the tail end of each aeration branch pipe. The total cross-sectional area of the aeration holes of each aeration branch pipe is greater than twice the cross-sectional area of the mud discharge groove. 2. the high-efficiency aeration system for MBR process membrane unit according to claim 1, is characterized in that, described each aeration branch pipe aeration hole opening aperture is 3-6mm, and opening number is 12- 20, the height of the mud discharge tank is 2-5cm, and the inner diameter of the mud discharge tank is 10-15mm. 3. the high-efficiency aeration system for MBR process membrane unit according to claim 1, is characterized in that, the number of perforations of said aeration branch pipe aeration holes is 15, adjacent to the inlet end of the aeration branch pipe The 5 aeration holes have a diameter of 5 mm, and the remaining 10 aeration holes have a diameter of 4 mm; the inner diameter of the mud discharge tank is 10 mm, and the height is 45 mm.