SUNChen,GAOMeng-jia,CHENShu-can,et al.Effect of Fe3+ on Membrane Fouling in Microalgae-Bacteria Consortia for Swine Wastewater Treatment[J].China Water & Wastewater,2023,39(17):18-25.
Effect of Fe3+ on Membrane Fouling in Microalgae-Bacteria Consortia for Swine Wastewater Treatment
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第17期
Page:
18-25
Column:
Date of publication:
2023-09-01
- Keywords:
- iron ion; microalgae-bacteria consortia; membrane fouling; extracellular polymeric substances; swine wastewater
- Abstract:
- The application of electric field pretreatment and microalgae-bacteria consortia-membrane coupling technology in swine wastewater treatment can achieve efficient removal of carbon, nitrogen and phosphorus, but membrane fouling is one of the main problems restricting its application. Based on the effect of residual iron ions in electric field pretreatment on membrane fouling，iron ions were added to the components of microalgae-bacteria consortia and their secreted extracellular polymeric substances (EPS) to reach the concentrations of 15 mg/L, 40 mg/L, 60 mg/L and 150 mg/L, respectively，and the contribution and mechanism of the interaction between iron ions and EPS components to membrane fouling were studied. The results showed that there was a critical point for the effect of iron ions on membrane fouling. When the iron ion concentration was lower than the critical point, the membrane fouling was reduced, and vice versa. It was speculated that the critical value of iron ion concentration should be between 40 mg/L and 60 mg/L. The reason for membrane fouling was the main component of EPS, tyrosine proteins, and the largest contributor to membrane fouling was soluble microbial products (SMP). The binding ability of SMP to iron ions was stronger than other components, which was the main contributor to EPS membrane fouling. The addition of iron ions had the greatest influence on the fitting degree of the complete clogging model of SMP and microbial flocs (MFR), and the fitting R2 values were 0.324 1 and 0.371 1. For loosely bound extracellular polymer (LB-EPS) and tightly bound extracellular polymer (TB-EPS), it had the greatest influence on complete blockage and standard blockage models, and also affected the distribution of pollutants on the membrane surface.
Last Update:
2023-09-01