Journal ArticleDOI
Roles of bacterial cell and extracellular polymeric substance on adsorption of Cu(II) in activated sludges: A comparative study
TLDR
In this article, the role of bacterial cell and extracellular polymeric substance (EPS) on adsorption of heavy metal remains elusive, and the authors found that the EPS content highly positively correlated with the Cu(II) content adsorbed by EPS.Abstract:
Activated sludge adsorbs heavy metals in the water during the water treatment process, which brings trouble to the subsequent treatment of the waste sludge. However, the role of bacterial cell and extracellular polymeric substance (EPS) on adsorption of heavy metal remains elusive. Here, we found the anammox sludge possessed the highest Cu(II) adsorption capacity (14.68 mg/g SS), followed by the activated sludge and denitrifying sludge. The Cu(II) adsorption capacities of sludges increased when sludge dosages and initial Cu(II) concentrations increased. These sorption processes were all well explained by Langmuir isotherms. Analysis of the Cu(II) distribution found that Cu(II) adsorbed by bacterial cells (35 %) were much higher than the Cu(II) adsorbed by EPS (4–11 %). This implied that bacterial cells were the most important carrier for the sludge to adsorb Cu(II). Additionally, the difference in Cu(II) adsorption of sludge was due to the inconsistent Cu(II) content adsorbed by EPS. Correlation analysis showed that the EPS content highly positively correlated with the Cu(II) content adsorbed by EPS, which indicates that the EPS content was crucial factor causing the difference in Cu(II) adsorption. FITR analysis shows that another key factor for disparate Cu(II) adsorption was functional groups, including amide I and amide II of protein, C–H from aliphatic, as well as O H and C O from carboxylic acid. This study provides more information for understanding the role of the bacterial cell and EPS in the adsorption of heavy metals, which might provide a theoretical basis for the treatment of heavy metals-containing sludge.read more
Citations
More filters
Journal ArticleDOI
Bacterial bioremediation of heavy metals in wastewater: A review of processes and applications
TL;DR: The inherent and adaptive mechanisms evolved in bacteria to defend the metal toxicity include bioadsorption/biosorption, bioaccumulation, bioprecipitation and bioleaching as mentioned in this paper .
Journal ArticleDOI
Response of fungi-microalgae pellets to copper regulation in the removal of sulfonamides and release of dissolved organic matters
TL;DR: In this article , Aspergillus oryzae pellets were combined with Chlorella vulgaris and the optimal conditions were at agitation speed of 130 rpm, fungi to microalgae ratio of 10:1 and the combined time of 3 h with the highest combination efficiency of 98.65%.
Journal ArticleDOI
Novel BODIPY-based fluorescent Lycopodium clavatum sporopollenin microcapsules for detection and removal of Cu(II) ions
TL;DR: In this article, microcapsules of L. clavatum sporopollenin (f-sporopilloin) immobilized with BODIPY were developed, and they were used as an adsorbent to remove Cu(II) ions from aqueous solutions.
Journal ArticleDOI
Response of fungi-microalgae pellets to copper regulation in the removal of sulfonamides and release of dissolved organic matters.
TL;DR: In this article , Aspergillus oryzae pellets were combined with Chlorella vulgaris and the optimal conditions were at agitation speed of 130-rpm, fungi to microalgae ratio of 10:1 and the combined time of 3-h with the highest combination efficiency of 98.65%.
Journal ArticleDOI
Applicability of a novel and highly effective adsorbent derived from industrial palm oil mill sludge for copper sequestration: Central composite design optimisation and adsorption performance evaluation
Xin Jiat Lee,Billie Yan Zhang Hiew,Billie Yan Zhang Hiew,Kar Chiew Lai,Wan Ting Tee,Suchithra Thangalazhy-Gopakumar,Suyin Gan,Lai Yee Lee +7 more
TL;DR: In this paper, the performance of palm oil mill sludge (POMS) towards copper pollutant comprehensively was evaluated using batch experiments, followed by statistical modelling to establish the simultaneous interactive effects of parameters and to optimise the system.
References
More filters
Journal ArticleDOI
Removal of heavy metal ions from wastewaters: A review
Fenglian Fu,Qi Wang +1 more
TL;DR: It is evident from the literature survey articles that ion-exchange, adsorption and membrane filtration are the most frequently studied for the treatment of heavy metal wastewater.
Book ChapterDOI
Heavy metal toxicity and the environment.
TL;DR: This review provides an analysis of arsenic, cadmium, chromium, lead, and mercury's environmental occurrence, production and use, potential for human exposure, and molecular mechanisms of toxicity, genotoxicity, and carcinogenicity.
Journal ArticleDOI
Extracellular polymeric substances (EPS) of microbial aggregates in biological wastewater treatment systems: a review.
TL;DR: As EPS are very complex, the knowledge regarding EPS is far from complete and much work is still required to fully understand their precise roles in the biological treatment process.
Journal ArticleDOI
Antimicrobial activity of metals: mechanisms, molecular targets and applications
TL;DR: The chemical and toxicological principles that underlie the antimicrobial activity of metals are described and the preferences of metal atoms for specific microbial targets are discussed.
Journal ArticleDOI
Influence of loosely bound extracellular polymeric substances (EPS) on the flocculation, sedimentation and dewaterability of activated sludge.
Xiao-yan Li,Shu-fang Yang +1 more
TL;DR: Although EPS is essential to sludge floc formation, excessive EPS in the form of LB-EPS could weaken cell attachment and the floc structure, resulting in poor bioflocculation, greater cell erosion and retarded sludge-water separation.
Related Papers (5)
Adsorption Behavior of Cu(II) onto Sludge Particulate Surfaces
Ching‐Tzone Tien,Chin Pao Huang +1 more
Sorption of Cu(II) and Cd(II) by extracellular polymeric substances (EPS) from Aspergillus fumigatus
Yurong Yin,Yongyou Hu,Fen Xiong +2 more