Published by Mazin AL~Bloushi, O&M TEAM LEAD
I need proSupport regarding Membrane Clean-In-Place (CIP) .
What could cause be after CIP that the DP didn't decrease much?
IF CIP is done properly with proper chemicals diff pressure has to come down resulting into better permeate flow rate... Depending upon capacity, Raw water Analysis, and plant recovery... Mail your details on kunjesh@januswater.com. for further consultancy.
Published by KUNJESH MALI, MR.
How much is the membrane age? If the CIP procedure has been selected properly for the special type of foulant, then it is possible that the membranes have reached the upper limit of their shelf life (normally 3-5 years). In addition, some manufacturers say that each CIP affects the performance of membranes so that they will not be alike the fresh installed ones.
Published by Hossein Esmaeili, Project Manager at Mahabghodss Consulting Engineering
Hi, Our membrane age almost 5 years..thanks for your info
Published by Mazin AL~Bloushi, O&M TEAM LEAD
Your issue is most likely due to organic or biofilm buildup on the membrane surface. CIP may be less effective depending on the method used. More information is required regarding the process and current method of CIP used to clearly understand the problem.
Published by Troy Green
Hi Troy, Regarding our method normally we usening first step biocide for two hrs recycltion then we go for high PH Then low PH Each socking and recycltion 1hr
Published by Mazin AL~Bloushi, O&M TEAM LEAD
First of all, you will need to know what type of contamination you have in order to select the proper cleaning!
Published by Dino Mitev
Your question is not complete you must mention type of feed water and their character ,pre treatment, all parameter before and after cleaning and cleaning solutions and strategy to evaluate membrane performance
Published by Ahmed Asar, Operation &process engineer at Metito
If gentle cleaning does't help go for harshest cleaning-Ref. Netto Hydranautics TSB107
If still there is no improvement, plan for membrane replacement.
Do autopsy study of the fouled membranes and take action to prevent.
Published by Govindasamy Manickam, GM at Adani Power Ltd.
High DP is due to a reduction in the open area for the feed flow. As the other commenters have suggested this could be due to an inadequate cleaning procedure. It could also be due to entrance of non-dissolvable materials (bacteria, silt, sand) into the elements. How are your elements arranged? Are you seeing the same type of DP across all of the vessels in the array, or are you seeing higher DP in either the first or last vessel? In the last vessel it is more likely to be precipitation of some compound from the feed water as the concentration increases. In the first vessel, and especially in the first element, it is likely to be something coming into the element with the feed. Could there have been construction debris left in the cleaning tank or piping?
Published by Pat Stanford, General Manager
Hi Pat
Thanks for your coment, Actully our RO is two stags and the DP which am talking about is 1st stag and it's commen for all 1st sags vesals. . Even we using same method of cip in 2nd stage and we geting good resultsa
Published by Mazin AL~Bloushi, O&M TEAM LEAD
I would check your cleaning procedure. Were pH's maintained in the correct range through out the CIP. Any problems with the chemical feed pumps. Were the chemicals mixed properly?
If the CIP was good, there is likely more fouling than expected and soak time, air scour, ect...will need to be adjusted.
Did the feed water change? Could you have a new kind of fouling.
Check with the manufacture
Published by Mark Milne, Wastewater Superintendent
Thanks Mark
Normaly we start with biocide
Then we use high ph 11.4-11.7
Recyclation and sock 1hr each 5 tims
Then we use low ph 3.5 - 2.3
Same as high ph procedure
And between each slution there is flushing step
Also we dump the first water of each slution
Am wondring if the wither temp is effcting also
Published by Mazin AL~Bloushi, O&M TEAM LEAD
If the DP did not change significantly it means your CIP protocol was inadequate.