Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 9, Issue 4, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.105264
Keywords
Preformed composite-coagulant; Coagulation-ultrafiltration; Permeate flux; Membrane fouling; Cake layer
Categories
Funding
- National Natural Science Foundation of China [51808530, 51778604]
- Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07501-002, 2017ZX07108-002]
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This study evaluates the impact of in situ formed inorganic-organic polymer composite coagulant (IPCC) on humic acid (HA) and bovine serum albumin (BSA) rich water treatment using cationic poly(diallyldimethylammonium) chloride (pDADMAC) of different molecular weights. Results show that IPCC effectively mitigated membrane fouling and improved permeate quality, depending on the polymer composition.
In situ formed inorganic-organic polymer composite coagulant (IPCC) is being increasingly applied in modern drinking water purification, although the impact of cationic polymers on the ultrafiltration (UF) process is controversial. This study evaluates the impact of preformed IPCC in coagulation-ultrafiltration treatment of humic acid (HA) and bovine serum albumin (BSA) rich water by using a cationic poly(diallyldimethylammonium) chloride (pDADMAC) of various molecular weight (MW) range. The effect of feed water components, and composition (2%, 5%, 10%) of polymers (large, L-pDADMAC and small, S-pDADMAC) on UF permeate water quality and membrane fouling were systematically investigated. Results show that IPCC effectively mitigated membrane fouling and improved permeate quality depending on polymer composition. Consistent with AFM and SEM fouling analysis, the membrane contact angle (fouling) under all pretreated BSA feed filtration was higher (82.0 degrees-90.3 degrees) than HA. It was very low (49.1 degrees) particularly under 10% L-pDADMAC pretreated HA media than that of 10% S-pDADMAC (51.9 degrees), but interestingly, the permeate flux in S-pDADMAC was high owing to its cake layer permeability. Consequently, BSA demonstrated more permeate flux decline (0.32-0.54) than HA (0.53-0.9), but highest DOC removal (similar to 90%) was achieved, attributed to the propensity of the cake layer for BSA, thereafter aggravating fouling.
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