Interaction between Heavy Metals and Aerobic Granules

Characteristics of the adsorbed heavy metals onto aerobic granules: isotherms and distributions

Desalination and Water Treatment ◽

10.1080/19443994.2014.927125 ◽

2014 ◽

Vol 53 (9) ◽

pp. 2388-2402 ◽

Cited By ~ 6

Author(s):

Ki Hong Ahn ◽

Seok Won Hong

Keyword(s):

Heavy Metals ◽

Aerobic Granules

Download Full-text

Effect of Copper (II) on the Characteristics of Aerobic Granules

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.113-116.71 ◽

2010 ◽

Vol 113-116 ◽

pp. 71-75 ◽

Cited By ~ 3

Author(s):

Xiao Ying Zheng ◽

Wei Chen ◽

Ning Wei Zhu ◽

Yong Cai Wang ◽

Di Wu

Keyword(s):

Heavy Metals ◽

Carbon Source ◽

Environmental Change ◽

Genetic Information ◽

Extracellular Polymeric Substances ◽

Sequencing Batch Reactor ◽

Batch Reactor ◽

Aerobic Granules ◽

Concentration Increase ◽

Effect Of Copper

Aerobic granules were cultivated successively in column sequencing batch reactor (SBR) with the glucose as carbon source. The effect of copper (II) on the characteristics of aerobic granules was studied. Results showed that the physical, morphology and extracellular polymeric substances (EPS) of aerobic granules were influenced in different degree under different concentrations of copper (II) in sequencing batch reactor (SBR). The appropriate Cu2+ can be adsorbed by the microorganisms in aerobic granules under the functions of chelation and displacement of heavy metals. Under the Cu2+ concentration of 0.5～3.0mg/L, the stable MLSS and better settleable granules with higher S.G. and lower SVI can been attained in the reactors. The sludge can maintain the granules in stable till the Cu2+ concentration increases to 20.0mg/L. The ratios of EPSC/EPN distribute in 6.60～7.01 steadily under the Cu2+ concentration of 0.5～10.0mg/L.However, excess Cu2+ can destroy the metabolism balance of the microorganisms and the protein synthesization and genetic information transportation are baffled. When the Cu2+ concentration increase to 50mg/L, more filamentous appears in the granules and the compact granules change to in disperse. The ratios of EPSC/EPN evidently rise to 7.59 and 7.46 respectively under high Cu2+ concentration of 20.0mg/L and 50.0mg/L. It suggests that the microorganisms try to excreting more EPS and protecting itself from the environmental change.

Download Full-text

Sampling and analysis of the air-water interface with SEM and EDS of microlayers

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100157000 ◽

1989 ◽

Vol 47 ◽

pp. 1004-1005

Author(s):

Randall W. Smith ◽

John Dash

Keyword(s):

Heavy Metals ◽

Surface Microlayer ◽

Surface Films ◽

Water Interface ◽

Physical Processes ◽

Infrared Spectroscopic Analysis ◽

Eds Analysis ◽

Air Water Interface ◽

Significant Area ◽

Bulk Chemical

The structure of the air-water interface forms a boundary layer that involves biological ,chemical geological and physical processes in its formation. Freshwater and sea surface microlayers form at the air-water interface and include a diverse assemblage of organic matter, detritus, microorganisms, plankton and heavy metals. The sampling of microlayers and the examination of components is presently a significant area of study because of the input of anthropogenic materials and their accumulation at the air-water interface. The neustonic organisms present in this environment may be sensitive to the toxic components of these inputs. Hardy reports that over 20 different methods have been developed for sampling of microlayers, primarily for bulk chemical analysis. We report here the examination of microlayer films for the documentation of structure and composition.Baier and Gucinski reported the use of Langmuir-Blogett films obtained on germanium prisms for infrared spectroscopic analysis (IR-ATR) of components. The sampling of microlayers has been done by collecting fi1ms on glass plates and teflon drums, We found that microlayers could be collected on 11 mm glass cover slips by pulling a Langmuir-Blogett film from a surface microlayer. Comparative collections were made on methylcel1ulose filter pads. The films could be air-dried or preserved in Lugol's Iodine Several slicks or surface films were sampled in September, 1987 in Chesapeake Bay, Maryland and in August, 1988 in Sequim Bay, Washington, For glass coverslips the films were air-dried, mounted on SEM pegs, ringed with colloidal silver, and sputter coated with Au-Pd, The Langmuir-Blogett film technique maintained the structure of the microlayer intact for examination, SEM observation and EDS analysis were then used to determine organisms and relative concentrations of heavy metals, using a Link AN 10000 EDS system with an ISI SS40 SEM unit. Typical heavy microlayer films are shown in Figure 3.

Download Full-text