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Application Pretreatment Post DI Post RO DI Fast/back 1 xh 1 xd 1 x week flush Cleaning Cleaning Chemical 1 xd 1 x week 1 xv cleaning Variability Table 8.16. - Cleaning recommendations Cleaning for Koch hollow fiber membranes. Frequency Fouling type General cleaning, i.e. organics and bacteria Heavy organic fouling Iron fouling Silica fouling Mode Fast flush with chemical Soak Upper backflush Lower backflush Fast flush without chemical Pre-Droduction rinse Agents - 200 mg/L NaOCL High Moderate LOW Reagents - 0.5% - 0.5% - 0.5% - 0.5% Cycle l-5 0 - 30 l-10 l-5 l-5 As rewired NaOH Citric acid + 0.2% Na EDTA Oxalic acid NaOH at 27 ‘C Duration (min.) 8.2 Storage Recommendations Table 8.17. - Chemical resistance of Koch hollow fiber membranes Chemical Resistance Both the Romicon GM 80 and PM 10 hollow fiber membranes show exceptional resistance to many chemicals. For example. at 25 “C, these fibers have strong resistance to the following chemicais: 10 % Acetic acid 5 % Ammonium 1 % Ciiric acid 5 % Diethanolamine 10 % EDTA-Na Hydroxide 25 % Ethanol 1 % Hydrogen Peroxide 5 % Hydrochloric acid 1 % Nitric acid 1 % Oxalic acid 1 % Sulfuric acid 5 % Phosphoric acid 1 % Sodium Hydroxide .04 % Sodium Hydrochlorite 1 % Sodium Azide Whenever a membrane system is to be shut down for an extended time, certain storage procedures must be followed. If the time is a week or less, they are usually as simple a: filling the system with permeate or treated feed water and then changing it when ever thl water temperature exceeds a limit specified by the manufacturer. In warm climates, o: where the system is exposed to sunlight, the water may have to be continuously recirculated For extended storage periods, the cellulosic and synthetic elements should be filled with : preservative to control biological growth and prevent freezing or overheating. Sam. membranes, such as AGT’s ultrafilters and Desalination Systems membranes, may b reglycerized and stored dry. Ceramic and metallic membranes and some polysulfone tubula filters can be merely cleaned and stored dry. Table 8.18 outlines recommendations on storag times, temperatures, and preservatives from a selection of manufacturers.PDF Image | DESALTING AND WATER TREATMENT MEMBRANE
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