Bioleaching of heavy metals from sewage sludge: A review

Pathak, Ashish; Dastidar, M.G.; Sreekrishnan, T.R.

doi:10.1016/j.jenvman.2008.11.005

Cited by 352 publications

(151 citation statements)

References 117 publications

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“…Heavy metals are not spontaneously wiped out in a normal state and are very stable in nature and even become more toxic and dangerous compounds over time, so they should be removed from contaminated environments using different methods. Methods such as chemical precipitation, electrochemical purifi cation, ion exchange, osmosis, membrane process, and surface adsorption by activated carbon and industrial and agricultural residues have been extensively used for the removal of lead and chromium from water [9][10][11][12]. These methods have a few disadvantages such as chemical precipitation and electrochemical purifi cation, do not response at low concentrations.…”

Section: Introductionmentioning

confidence: 99%

An Investigation and Comparison of Removing Heavy Metals (Lead and Chromium) from Aqueous Solutions Using Magnesium Oxide Nanoparticles

Dargahi

Golestanifar

Darvishi

et al. 2016

Pol. J. Environ. Stud.

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This study aims to investigate the effi ciency of magnesium oxide nanoparticles (MON) in vitro for the removal of lead (II) and chromium (VI) from aqueous environments. The effects of various parameters such as contact time (15 to 280 min), pH (3, 5, 7 and 9), the initial concentration of lead/chromium (10, 20, 30.40 and 50 mg/L), absorbent dose (0.3, 0.5 and 0.8 g/L), and shaking speed (150 to 350 rpm) was investigated. The parameters were optimized by varying one parameter at a time and keeping other parameters constant. The maximum removal effi ciency of MON for lead (II) and chromium (VI) was achieved at contact time 280 min, pH 9, initial concentration of lead/chromium 10 mg/L, adsorbent dose 0.8 g/L, and shaking speed 250 rpm. The results also indicated that MON convert the Pb 2+ to Pb 0 and Cr 6+ to Cr 3+ during the removal process. The adsorption of lead (II) and chromium (VI) follows the Langmuir isotherms, therefore the adsorption was of a physical nature.

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Section: Introductionmentioning

confidence: 99%

An Investigation and Comparison of Removing Heavy Metals (Lead and Chromium) from Aqueous Solutions Using Magnesium Oxide Nanoparticles

Dargahi

Golestanifar

Darvishi

et al. 2016

Pol. J. Environ. Stud.

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“…The highest content, among all the analyzed heavy metals, was recorded for zinc with its mean concentration of 1301.1 mg/kg DM. Zinc is considered the most essential microelement for plant growth and its very high concentration (above 2500 mg/kg DM) becomes toxic [13]. The lowest content among all of the tested heavy metals was shown by mercury at an average of 1.3 mg/kg DM.…”

Section: Resultsmentioning

confidence: 99%

Organic matter and heavy metals content modeling in sewage sludge treated with reed bed system

2017

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Abstract. The long process of sludge stabilization (7-15 years) remarkably reduces the organic matter content and causes the process of sludge humifaction. This paper presents the results of using low-cost methods of sludge treatment in the wastewater treatment plant located in Zambrow, Podlaskie Province. The results of studies on the organic matter and heavy metals content in sewage sludge after treatment in a reed bed system are presented. The aim of the research was to evaluate and model organic matter and heavy metals concentrations during sewage stabilization in reed bed lagoons. The lowest concentration, below 1.3 mg/kg DM of the examined seven heavy metals was mercury (Hg). The highest concentration, exceeding 1300 mg/kg DM was zinc (Zn). The obtained results for the heavy metals in sewage sludge from the reed bed lagoons in Zambrow show that the average content of the analyzed heavy metals is approximately 1620 mg/kg DM. The results of the study demonstrate a high efficiency of low-cost methods used in Zambrów WWTP in terms of the quality of the processed sludge. Sewage sludge from the lowest layer of the reed lagoon (12-14 years of dewatering and transformation) is characterized by the lowest organic matter and heavy metals content. The higher a sediment layer lies, i.e. the shorter the time of processing, the higher is the heavy metals content. This indicates a great role of reeds in the accumulation of these compounds.

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“…Chemical, electro-chemical and bio-leaching methods are widely used in removing heavy metals in sludge (Jakobsen et al, 2004;Shi et al, 2013;Babel et al, 2006). Bio-leaching is mostly implemented due to low acid waste utilization and high extract efficiency (Pathak et al, 2009a).…”

Section: Introductionmentioning

confidence: 99%

Using microbiological leaching method to remove heavy metals from sludge

Gu¹,

Aikebaier²,

Arefieva³

et al. 2017

Eurasian Journal of Soil Science (Ejss)

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Article Info Received : 13.05.2016 Accepted : 11.07.2016 Microbial leaching is one of the most effective methods to remove heavy metals from sludge. In the conducted researches, the sludge samples were processed with Thiobacillus ferrooxidans and Thiobacillus thiooxidans obtained via cultivation, extraction and purification processes. Heavy metals such as Pb, Cd, Cu and Ni were leached from sludge by Thiobacillus ferrooxidans and Thiobacillus thiooxidans within different substrate concentration and pH value conditions. It is defined that from the point of view of economy and efficiency the optimal concentration of FeSO4.7H2O and sulfur for bio-leaching process was 0.2 g. The leaching rates of heavy metals such as Pb, Cd, Cu and Ni of the same concentration were 74.72%, 81.54%, 70.46% and 77.35% respectively. However, no significant differences depending on the pH value among the leaching rates were defined, even for the pH value of 1.5. Along with the removal of heavy metals from sludge, the organic matter, N, P, K were also leached to some extent. The losing rate of phosphorus was the highest and reached 38.44%. However, the content of organic matter, N, P, K in the processed sludge were higher in comparison with level I of the National Soil Quality Standards of China. Ecological risk of heavy metals in sludge before and after leaching was assessed by Index of Geo-accumulation (Igeo) and comprehensive potential risk (RI). The results of research defined that the content of heavy metals in sludge meets the level of low ecological risk after leaching and their contents is lower in comparison with the National Agricultural Sludge Standard of China. Sludge leached by biological methods is possible to use for treatment for increasing soil fertility.

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Bioleaching of heavy metals from sewage sludge: A review

Cited by 352 publications

References 117 publications

An Investigation and Comparison of Removing Heavy Metals (Lead and Chromium) from Aqueous Solutions Using Magnesium Oxide Nanoparticles

An Investigation and Comparison of Removing Heavy Metals (Lead and Chromium) from Aqueous Solutions Using Magnesium Oxide Nanoparticles

Organic matter and heavy metals content modeling in sewage sludge treated with reed bed system

Using microbiological leaching method to remove heavy metals from sludge

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