Device and method for detecting membrane damage of a flat membrane module

Abstract

The present invention discloses a flat membrane module membrane-damage detecting apparatus and method. A stock solution tank is connected to a flat membrane module inlet via a first boost pump; the flat membrane module outlet is connected with the stock solution tank; the flat membrane module outlet is led out by two branch pipelines; the first branch pipeline is provided with a first solenoid valve and connected to an bacterial concentration detecting apparatus; a liquid storage tank is under the bacterial concentration detecting apparatus; the bottom of the bacterial concentration detecting apparatus is led to the liquid storage tank by a water output pipe of a bacteria collecting bottle and a liquid discharge channel of a liquid storage bottle; and the second branch pipeline is provided with a second solenoid valve and extends into the liquid storage tank. A sterile solution containing bacteria is filtered through a flat membrane filtering apparatus; bacteria in the filtrate is collected by the bacteria concentration detecting apparatus; the bacteria concentration is determined by using a detecting electrode mounted in the bacterial detecting apparatus to detecting impedance of the filtrate; the level of membrane damage is determined according to a measured impedance value; and the membrane does not need to be removed from the membrane module, so that the membrane is damaged, thereby implementing continuous on-line detection.

Description

technical field [0001] The invention relates to the technical field of filter membrane damage detection, in particular to a membrane damage detection device and method for a flat membrane module. Background technique [0002] The research and application of membrane separation technology has made great progress, and it has been widely used in seawater, brackish water desalination, pure water, ultrapure water production, as well as food industry, pharmaceutical industry, bioengineering and other fields. The flat membrane module is one of the most commonly used membrane separation modules. The flat membrane module is composed of a support layer and a membrane layer. Generally, the feed liquid passes through both sides of the support layer driven by the feed pump and passes through the membrane. The permeate of the layer is collected on the outside of the membrane. The flat membrane has the advantages of easy disassembly and cleaning. However, after a long period of operation...

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Problems solved by technology

[0003] At present, the commonly used membrane damage detection methods mainly include the following: 1. Bubble point test method: the principle of this method is to detect the energy of a fully wetted membrane when the gas breaks through the pores of the wetted membrane to form a large number of bubbles under the condition of slow pressure. The minimum pressure to be detected, but the membrane needs to be removed from the membrane module during the measurement, and online detection cannot be realized; 2. Turbidity detection method: This method is based on the difference in turbidity of the permeate before and after the membrane is damaged. The turbidity of the liquid reflects whether the membrane is complete; although the turbidity detection method can be continuously detected online, the detection is not sensitive and is limited by the particle concentration of the original solution and the process conditions, so the application range is small

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