Mercury Pollution Removal

Overview

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Key numbers

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• of 120 mg/L and a maximum Hg(II) removal rate of 86.72 ± 2.11%, in 48 h under optimum cul-
• using dead bacterial biomass (DBB). At low concentrations (Hg(II) ≤ 10 mg/L), RTS-4 bacteria
• were 54.57 ± 0.36% and 45.43 ± 0.19% of the total removal efficiency, respectively. At moderate
• concentrations (10 mg/L < Hg(II) ≤ 50 mg/L), all three mechanisms listed above coexisted, with
• the percentages being 0.26 ± 0.01%, 81.70 ± 2.31%, and 18.04 ± 0.62% of the total removal rate,
• respectively. At high concentrations (Hg(II) > 50 mg/L), the bacteria primary employed EPS and
• DBB adsorption to remove Hg(II), where the percentages were 19.09 ± 0.04% and 80.91 ± 2.41% of
• can tolerate up to 120 and 60 mg/L of Hg(II), in solid and liquid media, respectively, and
• the removal rate of Hg can reach 86.72 ± 1.38%, at 48 h. RTS-4 bacteria also have the
• taining 120 mg/L Hg(II). One bacterial strain had 100% similarity to the Rheinheimera
• associated taxa50% of bootstrap
• mal growth conditions of RTS-4 were 30 °C, pH 7, 150 rpm, and 5% inoculation amount (Fig-
• The optimal growth conditions of RTS-4 were 30 ◦ C, pH 7, 150 rpm, and 5% inoculation
• liquid medium were 120 mg/L and 60 mg/L, respectively. Under optimal growth conditions,
• the Hg(II) removal rates of RTS-4 after 24, 48, and 60 h were 55.80 ± 1.30%, 86.72 ± 1.38%, and
• Hg tolerant concentrations in solid and liquid medium were 120 mg/L and 60 mg/L,
• 86.98 ± 2.01%, respectively (Figure 1C). After 24 h, the Hg(II) removal rates of Enterobacter hel-
• veticus and Brevundimonas HgP1 were 28.80% and 63.60%, respectively, at a 5.5 mg/L initial
• 28.80% and 63.60%, respectively, at a 5.5 mg/L initial Hg(II) concentration (27,28). The
• AG0352A (Enterococcus faecium) were about 70% at a 5 mg/L initial Hg(II) concentration,
• (10 mg/L), indi- its great potential
• 10 mg/L Hg(II),
• mechanism in the RTS-4 bacterial strain. Bars (means values ± SD) with different letters are sig-
• Hg(II) after 2 h in the control group (without RTS-4 bacteria and adding 10 mg/L Hg(II))
• and the experimental group (with RTS-4 bacteria and 10 mg/L Hg(II)) were 0.56 ± 0.01%
• and 0.54 ± 0.01%, respectively, indicating that the reduction of Hg(II) in the experimental
• control group, the removal rate of Hg(II) increased to 23.41 ± 0.93%, indicating that the
• The content of the EPS polymer was 1025.46 ± 12.98 mg/L, indicating that RTS-4
• (Figure S3A), and did not produce mucus or filamentous substances after 10 mg/L Hg(II)
• treatment (Figure S3B). However, when the concentration of Hg(II) was raised to 20 mg/L
• began to be produced. At a Hg(II) concentration of 50 mg/L, the cell morphology was
• cells could grow very well in lower concentrations (10 mg/L) of Hg(II), gradually produced
• EPSs to adsorb Hg(II) at the concentrations of 20, 30, and 40 mg/L (medium concentrations),
• became damaged with the mass production of EPSs in high concentrations (50 mg/L) of
• Hg(II), and stopped growing and produced dead bacterial biomass in 60 mg/L Hg(II)
• that the concentrations of 10 and 50 mg/L are the thresholds for different mechanisms of
• The adsorption rate of Hg(II) by EPSs reached 23.50 ± 0.98% after 120 h (Figure 3C).
• bacteria, under high concentrations of Hg(II) (50 mg/L) (Figure S3) (32–34).
• of Hg(II) by EPSs between 0 and 20 h was found to account for 81.70 ± 1.33% of the total
• EPS solution (Figure 3G,H) containing 50 mg/L Hg(II).
• increased (Figure S3C,D). When the concentration of Hg(II) was raised to 40 mg/L, a large
• Hg(II) concentration of 50 mg/L, the cell morphology was damaged, the surface was covered

Methods (brief)

• of 10 and 50 spectroscopy (ICP–OES), and transmis-
• spectroscopy (ICP–OES),
• Wastewater was collected from the industrial sewage outfall in Xigu District, Lanzhou
• repeated in triplicate for each group. Culture medium (3 mL) was collected at regular
• where C is the Hg(II) removal rate, C0 is the initial Hg(II) concentration in the samples, and
• C1 is the remaining Hg(II) concentration in the samples after bacterial treatment.
• The bacterial strains were collected by centrifugation in a culture medium containing
• The extracellular polymeric EPS purified sample was freeze-dried (FreeZone 6, Lab-
• conco Corporation, Kansas City, MO, USA), the dried sample was ground into a powder,
• on volatile oils accumulation in Atractylodes lancea. Sci. Rep. 2016, 6, 34735. (CrossRef)

Implications

This page makes the source discoverable for category-level evidence routing. Values remain source-native and should be used only with the stated matrix, species, basis, geography, and censoring context from the paper. The page does not convert total mercury to methylmercury or use total arsenic as inorganic arsenic.

Wiki pages this source may touch

• Fish — marine, non-predatory (sardines, anchovies, salmon, cod)
• Mercury
• Mercury
• Arsenic
• Chromium

Verification notes

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Update history

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