DTRO guide disc generating vertical-and-horizontal turbulent flow

A deflector, vertical and horizontal technology, which is applied in the field of reverse osmosis membrane element manufacturing, can solve the problems of fouling and blocking, the decline of DTRO performance, and the lack of excessive dependence on pretreatment, so as to achieve excellent tolerance and stable water flow. , The effect of stabilizing the water quality

Active Publication Date: 2018-08-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] DTRO is used to treat high-concentration sewage and landfill leachate, which has been recognized by the market. Compared with the traditional membrane process, the advantages of DTRO include: 1. It does not rely too much on pretreatment, and the open flow channel can handle colloids and suspended solids. 2. The flow channel of the module module is wide, and the special hydraulic conditions make the liquid run in turbulent flow in the membrane column, which is not easy to cause membrane fouling; 3. The fouling is easy to remove, especially the removal effect of biological fouling is remarkable; 4 , High recovery rate; 5. Standardized module series, flexible assembly. At present, DTRO has begun to be applied in the field of high-concentration sewage and landfill leachate treatment and has gradually matured. After investigation, it is found that there are many researches on the application of DTRO, but there are many studies on the application of DTRO. There are few studies on the R&D and design of its internal structure
Through the special design of the flow channel, DTRO increases the flow velocity of the raw water when it flows through the surface of the membrane bag and the surface of the guide plate, making it form turbulent flow. The form of turbulent flow can increase the passability of raw water and reduce the possibility of fouling. During the intermittent period of operation, it is inevitable that substances that cause fouling will stay on the upper surface of the membrane bag and the upper surface of the diversion plate, and finally form a relatively stubborn fouling layer, resulting in a significant decline in the performance of DTRO. DTRO needs regular maintenance. The generation of fouling layer will increase maintenance frequency and maintenance cost

Method used

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  • DTRO guide disc generating vertical-and-horizontal turbulent flow
  • DTRO guide disc generating vertical-and-horizontal turbulent flow
  • DTRO guide disc generating vertical-and-horizontal turbulent flow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] see figure 1 , a DTRO deflector plate capable of generating vertical and horizontal turbulence, including a plate body, the center of the plate body is provided with a concentrated water turning channel 3, a water production hole 4 and a water production channel 5, and the outer periphery of the plate body is provided with a raised edge 6. Both sides of the disc body are planes, and there are multiple indented pits 1 distributed on both sides of the disc body at intervals, and a plurality of convex holes are distributed on the disc body plane between adjacent pits 1 The bump 2. There is no intersection between adjacent pits 1, and bumps 2 are all distributed on the edge of the pits. The bottoms of the bumps 2 are all on the same plane, and the heights of each bump 2 are the same; the upper edge of the pit 1 is all on the same plane, and it is the same plane as the bottom of the bump 2; the upper edge of the pit 1 After rounded corners, it smoothly transitions to the p...

Embodiment 2

[0021] A membrane column with 209 membrane bags assembled with the diversion disc in the form of bumps and pits in Example 1, and a membrane column with 209 membrane bags assembled with the traditional diversion disc, under the same raw water conditions, the same process Test its desalination rate and permeate decay rate under water pressure (70bar). The DTRO system runs for 8 hours a day and stops for 16 hours. Raw water conditions: 30000us / cm sodium chloride solution, 25°C. The experiment was carried out for 10 weeks.

[0022] Comparison of results of salt rejection rate (%) over time image 3 ; The results of water production (L / h) change with time are compared for example Figure 4 As can be seen from the above experimental data: the DTRO membrane column assembled by the diversion plate in the form of bumps and pits according to the present invention, under the same experimental conditions, the desalination rate attenuation is slower than that of the traditional DTRO memb...

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Abstract

The invention discloses a DTRO guide disc generating vertical-and-horizontal turbulent flow. The DTRO guide disc comprises a disc body, wherein the two sides of the disc body are planes, multiple sunkconcave pits are distributed on the planes on the two sides of the disc body at intervals, and multiple protruding convex points are distributed at the portions, located between the adjacent concavepits, of the planes of the disc body. The DTRO guide disc generates horizontal turbulent flow, the mass transfer effect is enhanced, concentration polarization is reduced, and scale formation risk isreduced; meanwhile, raw water can fluctuate up and down, fluctuating force acts on a film bag, the film bag can generate chaotic small amplitude vibration, pollution and blocking matter with the largeviscidity can be thrown away through vibration, and with turbulent flow generated by the convex points, the pollution and blocking matter is taken away from a film column, it is avoided that as the surface of the film bag is covered with the pollution and blocking matter, the effective film area is decreased, and therefore it is avoided that as effective film area is decreased, the produced waterflow is reduced.

Description

technical field [0001] The invention belongs to the technical field of manufacturing reverse osmosis membrane elements, and in particular relates to a disc-tube reverse osmosis (hereinafter referred to as DTRO) guide plate for treating high-concentration sewage and landfill leachate. Background technique [0002] DTRO is used to treat high-concentration sewage and landfill leachate, which has been recognized by the market. Compared with the traditional membrane process, the advantages of DTRO include: 1. It does not rely too much on pretreatment, and the open flow channel can handle colloids and suspended solids. 2. The flow channel of the module module is wide, and the special hydraulic conditions make the liquid run in turbulent flow in the membrane column, which is not easy to cause membrane fouling; 3. The fouling is easy to remove, especially the removal effect of biological fouling is remarkable; 4 , High recovery rate; 5. Standardized module series, flexible assembly....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/08B01D61/10C02F1/44
CPCB01D61/025B01D61/08B01D61/10C02F1/441
Inventor 蔡相宇张韦海王双张辉张庆福
Owner TIANJIN UNIV
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