[Anti-fouling characteristics of the novel precoating reagent in dynamic membrane bioreactor].
Further research was made on precoating reagents in dynamic membrane process, in which novel precoating reagent-polyvinyl alcohol microsphere (PVA-MS) was prepared through emulsive polymerization of PVA and glutaraldehyde (GA). Furthermore, polymerization mechanism and anti-fouling characteristics through adsorption of membrane major fouling substances EPS upon PVA-MS were studied. The results showed that hemiacetals reaction played a major role in emulsive polymerization process, as the quantity of hydroxyl on PVA was decreased a little, PVA-MS surface behaved good hydrophilic, and the adsorption of protein and amylose upon PVA microsphere was stable and low, which was 0.543 mg x g(-1) and 0.694 mg x g(-1) respectively. In addition, PVA-MS surface behaved electronic negativity, which acted electrostatic repulsion to active sludge floc. Upon this characteristics and data, it was concluded that membrane fouling was delayed in microscopy structure. Diameter of PVA-MS in precoating liquid was about 1.14 microm, and Zeta-potential of precoating liquid with different precoating reagent concentration was less than - 39 mV, which made PVA microsphere diffused and stable from each other, then sedimentate rapidly on porous support membrane surface and internal wall of hole path. Besides, the morphology of PVA-MS and dynamic membrane formed from PVA-MS on support membrane were observed through SEM.
Ye
Mao-Sheng
MS
Key Laboratory of Industrial Ecology and Environmental Engineering, School of Environmental & Biological Science & Technology, Dalian University of Technology, Dalian 116024, China. bloomye@163.com
Zhang
Han-Min
HM
Yang
Feng-Lin
FL
Cui
Xia
X
D000327:Adsorption; D019149:Bioreactors; D005976:Glutaral / Q000737:chemistry; D008567:Membranes, Artificial; D008863:Microspheres; D011108:Polymers / Q000737:chemistry; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D013499:Surface Properties; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*
D008567:Membranes, Artificial; D011108:Polymers; D011142:Polyvinyl Alcohol; D005976:Glutaral