Method for rapidly determining nanofiltration membrane kind and operation conditions during water processing

A technology of operating conditions and nanofiltration membranes, which is applied in the field of nanofiltration membrane reuse in water treatment, can solve the problems of complex analysis methods and the inability to quickly evaluate membrane performance, and achieve less time and workload, rapid evaluation and prediction, Effect of Membrane Fouling Reduction

Inactive Publication Date: 2014-07-23
NANJING UNIV
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  • Application Information

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Problems solved by technology

In the evaluation of the performance of nanofiltration membranes in the prior art, qualitative analysis is mostly used, and the analysis methods are complicated, which cannot realize rapid evaluation of membrane performance and quantitative comparison between various nanofiltration membranes

Method used

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  • Method for rapidly determining nanofiltration membrane kind and operation conditions during water processing
  • Method for rapidly determining nanofiltration membrane kind and operation conditions during water processing
  • Method for rapidly determining nanofiltration membrane kind and operation conditions during water processing

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Embodiment 1

[0035] The method for quickly determining the type and operating conditions of the nanofiltration membrane in water treatment of the present embodiment, its specific steps are as follows:

[0036] (1) The water quality of the biochemical effluent of a fermentation pharmaceutical wastewater pretreated by a security filter is shown in Table 1:

[0037] Table 1 The water quality of a certain fermented pharmaceutical wastewater biochemical effluent after being pretreated by a security filter

[0038]

[0039](2) The NFW nanofiltration membrane of Synder Company and the HNF90 nanofiltration membrane of Hyde Energy Company were selected for the test. Before the membrane filtration experiment, wash the nanofiltration membrane with pure water and soak it for about 24 hours, then pre-press it at a pressure of 1.5-1.6 MPa for about 1.2 hours until the membrane flux of pure water is stable, and then set it aside.

[0040] (3) Filter the waste water through a security filter. The str...

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Abstract

The invention discloses a method for rapidly determining nanofiltration membrane kind and operation conditions during water processing, and belongs to the field of nanofiltration membrane recovery during water processing. The method comprises the steps: (1) screening pressure X1, temperature X2 and water inlet flow X3 as response factors, and designing experiment combinations; (2) employing membrane flux Y1 and pollution index Y2 as response value; (3) immersing a nanofiltration membrane in pure water, pre-pressing for usage; (4) filtering wastewater by a precision filter; (5) performing filtration experiments; (6) at the beginning and after two hours of the membrane filtration experiments in the step (5), respectively employing a balance to measure the water outlet flux, employing a conductivity instrument to measure the conductivity, and employing an ultraviolet spectrophotometer to measure UV<254>, so as to obtain salt removing rate and organics removing rate; (7) determining a regression model equation; (8) determining optimum operation conditions; and (9) determining membrane performance evaluation index I. The method is capable of relatively rapidly performing quantitative evaluation on nanofiltration membrane performances and comparing various nanofiltration membranes through a quantification process.

Description

technical field [0001] The invention belongs to the field of nanofiltration membrane reuse in water treatment, and more specifically relates to a method for selecting a nanofiltration membrane in the reuse of industrial wastewater and a method for optimizing the operating conditions of the nanofiltration membrane. Background technique [0002] Nanofiltration membrane separation technology treats industrial wastewater by separating the pollutants in the wastewater to achieve the purpose of wastewater treatment, which has changed the previous situation of complex wastewater treatment process, serious pollution, and high energy consumption, making industrial wastewater treatment relatively simple and cost-effective. Secondary pollution, and can recycle reusable substances and water, with the characteristics of energy saving, no phase change, simple equipment, convenient operation and so on. After the design and installation of the entire process system is completed, it is feasi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/10C02F1/44
Inventor 许柯张婷婷任洪强耿金菊丁丽丽
Owner NANJING UNIV
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