New insight into the effects of Ca(II) on cake layer structure in submerged membrane bioreactors.
The effects of Ca(II) on the structure of the cake layer in submerged membrane bioreactors (SMBRs) were investigated in this study. Three parallel laboratory-scale SMBRs were operated with synthetic municipal wastewater with three Ca(II) levels (82, 208 and 410 mg l(-1)). As the Ca(II) concentration increased, the sludge floc size increased and the molecular weight of the soluble microbial products (SMP) in the bulk liquid decreased. These observations were attributed to the neutralization and bridging function of Ca(II). Furthermore, Ca(II) addition did not change the thickness of the cake layer, but inhibited the deposition of other elements, such as Al, Si, Mg, and Fe. As a result of Ca(II) addition, the cake layer became less compact and more porous. The interspaces among the flocs in the cake layer helped to reduce the membrane fouling potential.
a State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering , Tongji University , Shanghai , PR China.
Lijie
L
Zhou
Zhiqiang
Z
Zhang
Xiangzhou
X
Meng
Jinhong
J
Fan
Siqing
S
Xia
D057219:Biofouling; D019149:Bioreactors / Q000382:microbiology*; D002118:Calcium / Q000737:chemistry*; D008567:Membranes, Artificial; D013499:Surface Properties; D062065:Wastewater / Q000382:microbiology; D018508:Water Purification / Q000295:instrumentation
D002118:Calcium; D008567:Membranes, Artificial; D062065:Wastewater
Ca(II); cake layer structure; membrane fouling; sludge flocs; submerged membrane bioreactor