JPH04161232A - Cleaning of membrane module - Google Patents

Abstract

PURPOSE:To clean a membrane module even in the inside effectively by supplying a detergent in the insides of a plurality of tubular membranes set in a membrane module and passing the detergent from the insides to the outside of the tubular membranes. CONSTITUTION:An immersion-type membrane module 13 which is immersed in a microbe tank or a membrane separation tank or in a chemical liquid cleaning tank 11 after being taken out of the previously mentioned tank is cleaned with a chemical liquid cleaning liquid 12. At that time, the cleaning liquid 12 is supplied to the insides of a plurality of tubular membranes 16 set in the membrane module 13 and the cleaning liquid is led from the insides to the outsides of the tubular membranes 16. that is, the cleaning liquid passes in the reverse direction to the flow of a permeable liquid, so that matters 17 adhering to the surfaces of the tubular membranes 16 are removed by the flow of the cleaning liquid 12. As a result, matters adhering to the surfaces of the tubular membranes can be removed effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a membrane module cleaning method for cleaning a submerged membrane module with a cleaning liquid.

Conventional technology In recent years, a membrane module consisting of a plurality of ceramic tube membranes arranged in parallel is immersed in a tank, and the inside of the ceramic tube membrane is in a suction state to process wastewater for only filtration treatment, or for microbial treatment and filtration treatment. It has already been put into practical use. Because a cake layer adheres to the surface of each ceramic tube membrane of this membrane module during the filtration process, the fourth
As shown in the figure, the membrane module 1 was periodically immersed in a chemical solution 2 (for example, an acid such as dilute hydrochloric acid, or an alkaline solution) as a cleaning solution to dissolve the cake layer 3 while cleaning.

However, in the conventional membrane module cleaning method described above, the membrane module 1 is simply immersed in the chemical solution 2, so as shown in FIG. In the interior of the membrane module 1, which is placed in this state, the chemical solution 2 is consumed by contaminants (cake layer 3) on the membrane surface, etc., and does not reach the inner surface of the membrane, resulting in a problem that the cleaning effect is low.

The present invention solves the above problems, and aims to provide a membrane module cleaning method that can effectively clean the inside of the membrane module.

Means for Solving the Problems In order to solve the above problems, the present invention supplies a cleaning liquid to the inside or outside of a plurality of tubular membranes arranged in a membrane module, and cleans the tubular membranes from the inside to the outside. This allows cleaning liquid to pass from the outside to the inside.

Effect With the above structure, even if there is any deposit on the surface of the tubular membrane, the cleaning liquid is forced to pass through the surface and inside of the membrane, so the cleaning solution gradually spreads inside the membrane and effectively removes the deposit on the membrane surface. removed.

Example An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 11 denotes a cleaning tank in which a chemical solution 12 for membrane cleaning is stored, and a membrane module 13 to be cleaned is immersed in this cleaning tank 11. The membrane module 13 is connected to a filter 15 arranged in a cleaning tank 11 through a pump 14, and is connected to the inside of each ceramic tube membrane 16 (see FIG. 2) arranged in a plurality of rows in the membrane module 13. is the chemical solution 12 filtered by the filter 15
is being supplied.

In the above configuration, when cleaning the membrane module 13, the pump 14 is driven to clean the chemical solution 1.
2 flows from the inside of the ceramic tube membrane 16 to the outside (direction a in FIG. 3), and due to the flow of the chemical solution 12 in the opposite direction to that during filtration, it adheres to the surface of the ceramic tube membrane 16. Cake layer 17 is effectively removed.

Note that the chemical solution 12 in the cleaning tank 11 containing the cake layer 17
may be filtered by the filter 15 to be cleaned and used again as a cleaning solution, or the dirty cleaning solution may be replaced without providing the filter 15.

In addition, as in the above embodiment, the membrane module 13 may be immersed in the chemical cleaning tank 11 for chemical cleaning, or in the case of a system in which the membrane separation tank can be divided into several compartments, the membrane immersion tank (cleaning tank ) may be separated from the others by a valve or dam, and only one chamber may be cleaned with a chemical solution using this method.

Furthermore, in the above embodiment, the case where the chemical solution is passed from the inside of the ceramic tube membrane to the outside has been described, but it is also possible to pass the chemical solution from the outside of the ceramic tube membrane to the inside (direction b in FIG. 3). .

Effects of the Invention As described above, according to the present invention, the cake layer attached to the surface of the tubular membrane can be effectively removed by flowing the cleaning liquid from the inside to the outside of the tubular membrane or in the opposite direction. , it is possible to clean the membrane module well and efficiently to the inside.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a cleaning device used in a membrane module cleaning method according to an embodiment of the present invention, FIG. 2 is a schematic sectional view of a membrane module for explaining the action of the same cleaning method, and FIG. 3 is a same cleaning method. Figure 4 is a block diagram of a cleaning device used in the conventional membrane module cleaning method, and Figure 5 is a diagram illustrating the membrane module and the effect of the flow of the chemical solution in the method. FIG. 11...Cleaning tank, 12...Chemical solution (cleaning liquid), 13.
... Membrane module, 14... Pump, 15... Filter, 16... Ceramic tube membrane, 17...
Cake layer (deposit), a, b...flow direction of the chemical solution.

Claims (1)

[Scope of Claims] 1. A method for cleaning a submerged membrane module immersed in a microbial tank or a membrane separation tank, or taken out from the tank and immersed in a chemical cleaning tank, using a chemical cleaning solution, comprising: A cleaning solution is supplied to the inside of the plurality of tubular membranes arranged in the membrane module, and from the inside of the tubular membrane to the outside,
In other words, the cleaning solution is passed in the opposite direction to the flow of the permeate,
A method for cleaning a membrane module, characterized in that deposits on the surface of a tubular membrane are removed by a flow of cleaning liquid. 2. A method for cleaning a submerged membrane module immersed in a microbial tank or a membrane separation tank, or taken out from the tank and immersed in a chemical cleaning tank, using a chemical cleaning solution, the method comprising: A cleaning solution is supplied to the outside of the plurality of tubular membranes, and the washing liquid is supplied to the outside of the tubular membranes from the outside to the inside.
That is, a method for cleaning a membrane module, which comprises passing a cleaning liquid in the same direction as the flow of the permeate, and removing deposits on the surface of the tubular membrane by the flow of the cleaning liquid.