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Submerged tubular membrane element

A tubular membrane and submerged technology, applied in membrane technology, semi-permeable membrane separation, permeation/dialysis water/sewage treatment, etc., can solve the problems of no application of tubular membrane, low production capacity, high energy consumption in operation, etc., to achieve Reduce production costs, save energy, and reduce energy consumption

Inactive Publication Date: 2015-11-25
SHANGHAI SEVOO ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally, submerged membrane bioreactor (MBR) and submerged ultrafiltration (UF) tubular membranes adopt external internal pressure type, through high-speed, high-pressure, large-flow material circulation to form cross-flow filtration, and the produced water is outside the membrane tube. Collection, this external tubular membrane structure has high energy consumption and is mainly used in occasions with high recovery value. Due to structural design and low production capacity, tubular membranes are hardly used in submerged MBR and UF actual case

Method used

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Examples

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Embodiment 1

[0026] Example 1: Membrane water collection box 1 made of plastic mold, one side is DN40 water collection connection port 2, and the other side is 25×30 membrane tube connection port 3, which is connected by grouting and adhesive, tubular membrane tube 5 The outer diameter is 10mm, the inner diameter is greater than 8mm, the membrane material is PTFE, the membrane pore diameter is 0.3mm, the porosity is greater than 80%, and the support layer is 150g / m 2 Non-woven fabric, the membrane tube spacing is 15mm, the membrane tube length is 1000mm, and the double-sided water production collection box is used to ensure that the membrane water production flux is evenly distributed. The membrane element achieves an effective filtration area of ​​20m 2 , get 1000L / m in domestic sewage MBR 2 d(>40L / m 2 h) Stable operating flux, the transmembrane pressure difference is lower than 4Kpa, and the aeration intensity is lower than 6L / m 2 min, the backwash cycle is greater than 24 hours, and t...

Embodiment 2

[0027] Example 2: Membrane water collection box 1 made of plastic mold, one side is DN40 water collection connection port 2, the other side is 7×11 membrane tube connection port 3, connected by ultrasonic or heat welding, tubular membrane tube 5 The outer diameter is 13mm, the inner diameter is greater than 9mm, the membrane material is PVDF, the membrane pore diameter is less than 0.1mm, and the support layer is 150g / m 2 Non-woven fabric, the membrane tube spacing is 20mm, the membrane tube length is 750mm, and the double-sided water production collection box is used to ensure that the water production flux of the membrane is evenly distributed. The membrane element achieves an effective filtration area of ​​2.3m 2 , get 140L / m in UF 2 h stable operating flux, the transmembrane pressure difference is lower than 18Kpa, and the aeration intensity is lower than 6L / m 2 min, the backwash cycle is greater than 24 hours, and the backwash intensity is 2L / m2 min(100Kpa).

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Abstract

The invention discloses a submerged tubular membrane element, and relates to the technical field of water treatment microfiltration and ultrafiltration. The submerged tubular membrane element comprises a membrane producing water collecting box, a water catchment connector, membrane tube connectors, a tubular membrane array and membrane tubes, wherein the water catchment connector is arranged on one side of the membrane producing water collecting box, multiple membrane tube connectors for connecting the membrane tubes are arranged on the other side of the membrane producing water collecting box, an interface component array is formed by the multiple membrane tube connectors, the membrane producing water collecting box is connected with the tubular membrane array formed by the multiple membrane tubes through the interface component array, an aeration device is arranged below the tubular membrane element, and mixed liquor is driven to form circling-type cross flow by aeration to enhance membrane cleaning. The submerged tubular membrane element disclosed by the invention is simple in structure and reasonable in design, achieves uniform distribution of producing water flux of the membrane tubes, can achieve thorough back washing, and is low in cost, high in flux, low in energy consumption and not easy to cause pollution, thus having a high market popularization value.

Description

technical field [0001] The invention relates to the technical field of water treatment microfiltration and ultrafiltration, in particular to a tubular membrane element applied to a submerged membrane bioreactor or submerged ultrafiltration. Background technique [0002] At present, the membrane elements of the submerged membrane bioreactor (MBR) mainly include hollow fiber and flat plate. Among them, the cross-sectional area of ​​the hollow fiber membrane is small. And to operate below the critical flux, the length of the membrane filament must be limited within a certain range, or the permeate flux must be limited to a very low level, but due to the requirements of economic indicators, it is almost impossible to achieve in practical applications. Therefore, almost all Hollow fiber membranes have adopted the average critical flux design to assist backflushing measures, hoping to offset the spread of local fouling in unbalanced supercritical flux operation. In practice, it ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D63/06C02F1/44
Inventor 吴华
Owner SHANGHAI SEVOO ENVIRONMENT TECH
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