After the ultrafiltration filter pollution cleaning method 【 3 m filter.

In actual filter separation technology applications, while selecting suitable operating conditions of ultrafiltration filter and appropriate, but in the long run, due to the separation of material and other impurities in the filter surface will gradually accumulate, namely can cause pollution and congestion to filter, thus affecting the ultrafiltration filter water flux and service life. So the filter regularly effective cleaning is to restore ultrafiltration filter water flux and prolong its service life. The cleaning methods of practice, the commonly used chemical cleaning and physical cleaning two kinds big.

in the daily maintenance for the ultrafiltration filter, generally USES is physical cleaning method, divided into the following three different physical cleaning methods:

1, such as pressure washing: ultrafiltration water valve is closed, open the condensed water outlet valve, by increasing the velocity flushing filter surface, the method to remove a lot of loose impurity on the filter surface is very effective.

2, high pure water cleaning: due to the higher purity of water, dissolving capacity strengthened. When cleaning can be used first ultrafiltration water sweep away the dirt of filter on the loose, then use clean water cycle.

3, backwash: clean water from filter into the ultrafiltration and through the filter, rushed to concentrate mouth side, using the reverse flushing method can effectively remove coverage, but should pay special attention to when the back flush, prevent overpressure, avoid the filter break or destroy sealing adhesive surface.

when the filter pollution is serious, the use of physical methods cannot make flux recovery, have to use chemical cleaning agent for cleaning, the use of chemicals and filter surface impurities for chemical reaction to achieve the purpose of cleaning filter. When choosing chemicals also has the certain principle, one can't be with any chemical reactions to filter and components of other materials; 2 it is to use drugs to avoid secondary pollution. Below to introduce several kinds:

1, the acid solution to clean: commonly used solution with hydrochloric acid, citric acid, oxalic acid, etc. , mixing solution of PH = 2 ~ 3, using circulating wash or soak 0. 5 h ~ 1 h after cleaning, the inorganic impurities removal effect is good.

2, alkali cleaning: commonly used alkali are mainly sodium hydroxide, potassium hydroxide and sodium carbonate, etc. Alkali solution PH vary depending on the type of filter material, generally in the PH = 10 ~ 12 or so, the use of water circulation cleaning operation or soak 0. 5 h ~ 1 h after cleaning, can effectively remove impurities and grease. Cleaner:

3, oxidant by 1% ~ 3% H2O2, 500 ~ 1000 mg/L NaClO aqueous cleaning ultrafiltration filter, can remove dirt, kill bacteria. H2O2 and NaClO is a common fungicides.

4, enzymatic detergent: such as 0. 5% ~ 1. 5% pepsin, trypsin, etc. , to remove protein, polysaccharide, fat class pollutants effectively.