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Membrane bioreactor with electrochemically strengthened carbon nanotube hollow fiber membrane serving as separation unit

A technology of membrane bioreactor and carbon nanotubes, which is applied in the field of biological treatment of pollutants, can solve problems such as microbial hazards, excessive consumption of electric energy, and reduce the efficiency of electric repulsion, so as to reduce pollutants, save costs, and enhance water quality. Effect

Inactive Publication Date: 2019-02-26
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to reduce membrane fouling, non-conductive membranes are usually combined with metals to construct membrane modules, or metal membrane materials are directly used to construct MBRs. The release of metal ions will have a certain harmful effect on microorganisms

Method used

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  • Membrane bioreactor with electrochemically strengthened carbon nanotube hollow fiber membrane serving as separation unit
  • Membrane bioreactor with electrochemically strengthened carbon nanotube hollow fiber membrane serving as separation unit
  • Membrane bioreactor with electrochemically strengthened carbon nanotube hollow fiber membrane serving as separation unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Determination of the best voltage:

[0045] like figure 1 As shown, in the carbon nanotube hollow fiber membrane 22 (effective area 8.16×10 -5 m 2 ) respectively apply voltages of 0V, +0.5V, +1.0V and +1.5V, and use 100mg / L bovine serum albumin solution (BSA) as the target pollutant to determine the optimal voltage intensity to avoid the waste of electric energy. The carbon nanotube hollow fiber membrane 22 is used as the anode and the separation unit simultaneously, and the titanium net 12 (10cm×13cm) is used as the cathode. The flux of the membrane was used as an indicator to determine the optimal voltage to apply to the long-running EMBR.

[0046] Attached to the above experiment figure 2 (a) It can be seen that after the two-hour electrochemical enhanced membrane filtration experiment, the concentration of bovine serum albumin in the effluent was the lowest when the applied voltage was +1.0V and +1.5V, which were 51.37mg / L and 52.37mg / L respectively. Under th...

Embodiment 2

[0049] like figure 1 , shown in 3 and 4, a membrane bioreactor (EMBR) with electrochemically strengthened carbon nanotube hollow fiber membrane 22 as a separation unit, including a membrane bioreactor main body 10 and an automatic liquid level control device 4, the membrane The bioreactor main body 10 is a tubular structure with an effective volume of 1L, including a carbon nanotube hollow fiber membrane module 11 and activated sludge, and the carbon nanotube hollow fiber membrane module 11 is formed by connecting 6 carbon nanotube hollow fiber membranes in parallel The membrane module 11 of the carbon nanotube hollow fiber membrane 22 is used as the anode, the bottom end of the carbon nanotube hollow fiber membrane module 11 is connected with the titanium wire through the conductive silver paint, the positive electrode of the power supply 13 is connected, and the effective area is 5.44 ×10 -4 m 2 The titanium mesh 12 of 10cm * 10cm is used as the cathode, and the titanium ...

Embodiment 3

[0052] Operation of EMBR:

[0053] Referring to Example 2, three parallel reactors with an effective volume of 1 L are established, wherein the membrane material in the R1 reactor is a traditional hollow fiber membrane (Polyvinylidene Fluoride Hollow Fiber membranes, PVDF-HFMs), and the membrane in the R2 reactor The material is carbon nanotube hollow fiber membrane 22 (Carbon Nanotubes Hollow Fiber Membranes, CNTs-HFMs) without electricity, the membrane material of R3 reactor is electrochemically strengthened carbon nanotube hollow fiber membrane 22, and the other condition parameters R1 and R2 are The same as R3, wherein the parameters of the membrane material are shown in Table 1, and the specific operating parameters are as follows: the activated sludge in Example 2 comes from Dalian Lingshui Sewage Treatment Plant, the influent COD is 500mg / L, NH 4 + -N is 25mg / L, that is, each liter of influent water contains 0.47g glucose and 0.096g NH 4 Cl, 0.022g KH 2 PO 4 , 0.05g...

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Abstract

The invention relates to a membrane bioreactor with an electrochemically strengthened carbon nanotube hollow fiber membrane serving as a separation unit, and belongs to the technical field of biological treatment of pollutants. The membrane bioreactor takes the carbon nanotube hollow fiber membrane as the basic separation unit, and is combined with a liquid level control device, thereby forming anovel electrochemically enhanced aerobic membrane bioreactor under the action of electrochemical strengthening; in a continuous wastewater biological treatment process, an EMBR (Extractive Membrane Biological Reactor) system maintains relatively high pollutant removal efficiency and membrane fouling relieving capability. According to the membrane bioreactor, an electrochemical technology is used for quickly removing the pollutants from the surface of a membrane, thereby improving the water quality of effluent, alleviating membrane pollution and cyclically using the membrane material; the costof cleaning and replacing the material is reduced; moreover, the membrane bioreactor is relatively high in efficiency and easy to operate and has no secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of biological treatment of pollutants, in particular to invent a novel membrane bioreactor with an electrochemically strengthened conductive carbon nanotube hollow fiber membrane as a basic separation unit. Background technique [0002] Dwindling healthy water resources and increasingly stringent environmental regulations pose important technical challenges for wastewater treatment. Compared with traditional biological treatment technology, the emergence of Membrane Bioreactor (MBR) overcomes many defects in traditional biological treatment technology, and has the advantages of small footprint, high effluent quality, and less residual sludge. In addition, the membrane bioreactor can avoid the problem of microbial loss caused by too short hydraulic retention time and hydraulic scouring. Therefore, the membrane bioreactor system has become a research hotspot as an efficient water treatment technology. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCC02F3/005C02F3/12C02F2303/14Y02W10/10
Inventor 乔森杨月全燮
Owner DALIAN UNIV OF TECH