Influence of selector technology on heavy metal removal by activated sludge: Secondary effects of selector technology

Su, Ming-Chien; Daniel, K.; Anderson, Paul

doi:10.1016/0043-1354(94)00150-6

Cited by 32 publications

(28 citation statements)

References 8 publications

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“…The selector tank was divided into four compartments. The first and second compartments each had liquid volumes of 160 cm 3 ; the liquid volume of the third and fourth compartments was 190 cm 3 each.…”

Section: Methodsmentioning

confidence: 99%

“…The aeration tanks were cylindrical and made of translucent plastic. The liquid volume of the aeration tanks was 5 dm 3 . The clarifiers had a liquid volume of 1.8 dm 3 , were conical in shape and made from 304-grade stainless steel.…”

Section: Methodsmentioning

confidence: 99%

“…The liquid volume of the aeration tanks was 5 dm 3 . The clarifiers had a liquid volume of 1.8 dm 3 , were conical in shape and made from 304-grade stainless steel. Rotating scrapers were installed in the tanks for collection of sludge from the upper walls.…”

Section: Methodsmentioning

confidence: 99%

“…1 However, these procedures often have significant disadvantages including incomplete metal removal, high reagent or energy requirements or generation of toxic sludge, and are generally very expensive to operate at the dilute concentrations present in municipal wastewaters. 2 An alternative method that has been suggested 2,3 is to use microorganisms in biological wastewater treatment processes as a biosorbent for heavy-metal removal. A number of studies 4,5 have shown that some microorganisms present in activated sludge treatment systems produce extra-cellular polymers (ECPs) which can adsorb and remove soluble metals from wastewater.…”

Section: Like Many Other Cities In Developed Countries Bursa Inmentioning

confidence: 99%

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Influence of an aerobic selector on copper and hexavalent chromium biosorption by activated sludge

Alkan

Cindoruk

Taşdemir

et al. 2002

J of Chemical Tech & Biotech

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The influence of an aerobic selector on biosorption of Cu and Cr(VI) by activated sludge was studied. In-vitro batch adsorption tests were performed using sludge harvested from bench-scale activated sludge systems. Metal biosorption by activated sludge was rapid with equilibrium usually reached within an hour. Adsorption behaviour closely followed a Freundlich isotherm model. Experimental data suggested that an aerobic selector increased the biosorption of the metal ions by activated sludge, confirming observations by others in a similar study but with different heavy metals. Freundlich isotherms indicated that the biosorption capacity of activated sludge was increased by 15% for Cu and 30% for Cr(VI). Activated sludge from both systems had a greater biosorption capacity for Cu than for Cr(VI). The effects of pH and sludge concentration were also investigated. The results indicate that these parameters may influence the biosorption characteristics of activated sludge.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Like Many Other Cities In Developed Countries Bursa Inmentioning

confidence: 99%

See 2 more Smart Citations

Influence of an aerobic selector on copper and hexavalent chromium biosorption by activated sludge

Alkan

Cindoruk

Taşdemir

et al. 2002

J of Chemical Tech & Biotech

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“…Heavy metals may be removed by biosorption from wastewater in secondary treatment (Brown et al, 1973;Kim et al, 2002;Su et al, 1995;Tien and Huang, 1987) as well as from soils and sediments in bioremediation (Lovley and Coates, 1997). This phenomenon is often attributed to the binding of metals onto the bacterial cell surface (Beveridge and Murray, 1976;Cox et al, 1999;Lawson et al, 1984).…”

Section: Introductionmentioning

confidence: 98%

Characterization of electrostatic binding sites of extracellular polymers by linear programming analysis of titration data

Liu

Fang

2002

Biotech & Bioengineering

258

116

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Electrostatic binding sites of extracellular polymeric substances (EPS) were characterized from titration data using linear programming analysis. Test results for three synthetic solutions of given solutes comprising amino, carboxyl, and phenolic groups indicated that this method was able to identify the electrostatic binding sites. For the six sites with pK(a) between 3 and 10, the estimated pK(a) deviated 0.11 +/- 0.09 from the theoretical values, and the estimated concentrations deviated 3.0% +/- 0.9% from the actual concentrations. Two EPS samples were then extracted from a hydrogen-producing sludge (HPS) and a sulfate-reducing biofilm (SRB). Analysis of charge excess data in titration from pH 3 to 11 indicated that the EPS of HPS comprised of five electrostatic binding sites with pK(a) ranging from 3 to 11. The pK(a) values of these binding sites and the possible corresponding functional groups were pK(a) 4.8 (carboxyl), pK(a) 6.0 (carboxyl/phosphoric), pK(a) 7.0 (phosphoric), pK(a) 9.8 (amine/phenolic), and pK(a) 11.0 (hydroxyl). EPS of the SRB comprised five of similar binding sites (with corresponding pK(a) values of 4.4, 6.0, 7.4, 9.4, and 11.0), plus one extra site at pK(a) 8.2, which was likely corresponding to the sulfhydryl group. The total electrostatic binding site concentration of EPS extracted from HPS were 10.88 mmol/g-EPS, of which the highest concentration was from the site of pK(a) 11.0. The corresponding values for the EPS extracted from SRB were 16.44 mmol/g-EPS and pK(a) 4.4. The total concentrations of electrostatic binding sites found in this study were 20- to 30-fold of those reported for bacterial cell surface, implying that EPS might be more crucial in biosorption of metals than bacterial cell surface in wastewater treatment and in bioremediation.

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Zinc (II) ion recovery by biosorption onto powdered waste sludge (PWS): effects of operating conditions

Kargı

Cikla

2006

J of Chemical Tech & Biotech

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Powdered waste sludge (PWS) obtained from a paint industry wastewater treatment plant and pretreated with 1% H 2 O 2 was used for biosorption of Zn(II) ions from aqueous solution. The effects of operating conditions, pH, temperature, agitation speed, PWS particle size, Zn ion and PWS concentrations on the extent of Zn ion biosorption were investigated in batch experiments. The optimum pH resulting in maximum Zn ion biosorption was found to be pH = 5, since Zn ions precipitated in the form of Zn(OH) 2 at pH levels above 5. The rate and extent of Zn ion biosorption increased with temperature between 25 and 50• C, although biosorption was not strongly sensitive to temperature variations since the activation energy was low at 4.5 kcal mol −1 . Biosorbent particle size had a significant effect on Zn ion biosorption, yielding high percentage Zn removals at small particle sizes (D p < 100 µm) or large surface areas of PWS. Agitation speed also considerably affected the extent of Zn ion removal, and should be above 150 rpm in order to obtain a high rate. The extent of Zn ion biosorption was also affected by the initial Zn ion and PWS concentrations. At constant biosorbent (PWS) concentration, percentage Zn ion removal decreased, but the biosorbed Zn concentration increased with increasing initial Zn ion concentrations. However, at constant initial Zn concentrations, percentage Zn removal increased, but the biosorbed Zn ion concentration decreased with increasing adsorbent (PWS) concentration. With a maximum Zn ion biosorption capacity of 168 mg g −1 powdered waste sludge was proven to be an effective biosorbent compared to other biosorbents.

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Influence of selector technology on heavy metal removal by activated sludge: Secondary effects of selector technology

Cited by 32 publications

References 8 publications

Influence of an aerobic selector on copper and hexavalent chromium biosorption by activated sludge

Influence of an aerobic selector on copper and hexavalent chromium biosorption by activated sludge

Characterization of electrostatic binding sites of extracellular polymers by linear programming analysis of titration data

Zinc (II) ion recovery by biosorption onto powdered waste sludge (PWS): effects of operating conditions

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