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MICRODYN BIO-CEL XS-1 Pilot Plant Manual // Revision: A // Date: Jul. 25, 2018
Table 5 :
Maintenance Cleaning procedure
*
Steps Procedure
3
Prepare chemical solution with target concentration (250 mg/L sodium hypochlorite or
2,000 mg/L citric acid) and fill permeate tank with solution.
4 Backwash membranes till min level in permeate tank.
5 Soak membranes for total of 240 seconds.
6 Repeat steps 3,4 5 for total of 3 chemical backwash and relax (soaking time) cycles.
7
Backwash membranes in the train for 360 seconds (or longer if needed for larger sys-
tems) without adding chemicals to flush out the chemicals from piping.
8 Open the valves that isolate the filtration tank.
9 Turn on mixed liquor recirculation pump and membrane aeration for 5 minutes.
10 Resume normal operation.
Note: Numbers presented in this table are used as a starting point and may need to need to be
adjusted for each project.
This cleaning method is very close to the regular maintenance cleaning for full-scale applications.
Alternatively or additionally a recovery cleaning can be performed. The recovery cleaning is usu-
ally performed 1-2 times per year and with higher shemnical concentrations. The cleaning solu-
tion must be prepared in an external tank and pumped to the cleaned filtration tank. The mem-
branes stay in thie solution for several hours. Depending on the fouling degree and the frequency
of this cleanings, above concentrations could be applied or even higher up to 2000 mg/L sodium
hypochlorite or 5000 mg/L citric acid.
Table 6: Recovery Cleaning procedure
*
Steps Procedure
1
•
Stop feed pump, stop filtration. Continue to aerate membranes for 5 minutes.
2 Backwash clean water manually.
3 Drain the filtration tank completely and wash out all sludge residulas.
4
Prepare chemical solution (around 800 L) with target concentration (250-2000 mg/L so-
dium hypochlorite or 2000-5000 mg/L citric acid) in an external tank.
5 Pump chemical solution into filtration tank.
6 Soak membranes for around 6 hours.
7 Drain the filtration tank and flush with water.
8 Fill the thank again with sludge.
9 Open the valves that isolate the filtration tank.
10 Turn on mixed liquor recirculation pump and membrane aeration for 5 minutes.
11 Resume normal operation.
Note: Numbers presented in this table are used as a starting point and may need to need to be
adjusted for each project.