Cleaning method of flat plate ceramic membrane
A ceramic membrane and plate technology, applied in the field of membrane cleaning, can solve the problems of lack of specificity of cleaning agents, difficult to popularize and use, complicated cleaning steps, etc., to simplify cleaning steps and cleaning time, easy to popularize and apply, and simplify cleaning steps and time. Effect
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[0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS: The cleaning method of the flat ceramic membrane of the present invention will be further described in conjunction with examples below, but the present invention is not limited thereby.
[0022] The cleaning method of the present invention is carried out in a membrane filtration reactor, and the cleaning equipment used includes a cleaning pump and a membrane cleaning reactor.
[0023] The invention provides a method for cleaning flat ceramic membranes, the method comprising the following steps:
[0024] (1) Ultrapure water spray washing;
[0025] (2) Ultrapure water is backwashed at the first predetermined flow rate and the first predetermined time;
[0026] (3) Add the compound cleaning solution (sodium dodecylbenzene sulfonate + nonylphenol polyoxyethylene ether, disodium edetate + sodium dodecylbenzene sulfonate, ethylene diamine tetraacetate) at the second predetermined flow rate Disodium amine tetraacetate + nony...
example 1
[0041] Process conditions: polluted membrane: flat ceramic membrane to treat polluted membrane in municipal secondary effluent;
[0042] Cleaning method: liquid circulation + static soaking:
[0043] Cleaning temperature: room temperature:
[0044] Cleaning time: each step is different;
[0045] Preparation of cleaning solution: ultrapure water is used as solvent;
[0046] Sodium hypochlorite and disodium edetate compound cleaning solution: the mass concentration of sodium hypochlorite is 5‰, the concentration of disodium edetate is 10mmol / L, and the pH of the compound solution is adjusted to 12 with sodium hydroxide; Min flow rate cycle cleaning 40min;
[0047] Cleaning steps:
[0048] (1) Ultrapure water spray washing;
[0049] (2) Backwash with ultrapure water for 5 minutes at a flow rate of 2L / min;
[0050] (3) Add the compound cleaning solution of sodium hypochlorite and disodium ethylenediamine tetraacetate at a flow rate of 1L / min, and adjust the pH of the compoun...
example 2
[0054] Process conditions: polluted membrane: flat ceramic membrane to treat polluted membrane in municipal secondary effluent;
[0055] Cleaning method: liquid circulation + static soaking:
[0056] Cleaning temperature: room temperature:
[0057] Cleaning time: each step is different;
[0058] Preparation of cleaning solution: ultrapure water is used as solvent;
[0059]Compound cleaning solution of disodium edetate and nonylphenol polyoxyethylene ether: the concentration of disodium edetate is 10mmol / L, the concentration of nonylphenol polyoxyethylene ether is 4 times the micellar concentration, Adjust the pH of the compound solution to 12 with sodium hydroxide; circulate and wash at a flow rate of 1L / min for 40min;
[0060] Cleaning steps:
[0061] (1) Ultrapure water spray washing;
[0062] (2) Backwash with ultrapure water for 5 minutes at a flow rate of 2L / min;
[0063] (3) Add the compound cleaning solution of disodium ethylenediamine tetraacetate and nonylphenol...
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