Iron and lead ion adsorption by microbial flocculants in synthetic wastewater and their related carbonate formation

Yao, Minyu; Lian, Bin; Dong, Hailiang; Hao, Jianchao; Liu, Cong‐Qiang

doi:10.1016/s1001-0742(12)60151-x

Cited by 13 publications

(6 citation statements)

References 28 publications

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“…The concentration of metal ions was determined by atomic absorption spectrometer (AAS, AA-6300C, Shimadzu). The adsorption amount of Cd 2+ and Pb 2+ by biogenic CaCO 3 ( Q e ) was calculated based on Equation (1), the adsorption isotherms were obtained by use of C e with Q e , and the heavy metal adsorption rates were calculated by using of Equation (2), the formulae are as follows (Argun et al, 2007 ; Wang et al, 2007b ; Lian et al, 2008 ; Ma et al, 2012 ; Yao et al, 2013 ; Zhao et al, 2014b ; Liu et al, 2016 ):…”

Section: Methodsmentioning

confidence: 99%

Adsorption and Desorption Characteristics of Cd2+ and Pb2+ by Micro and Nano-sized Biogenic CaCO3

et al. 2018

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The purpose of this study was to elucidate the characteristics and mechanisms of adsorption and desorption for heavy metals by micro and nano-sized biogenic CaCO3 induced by Bacillus subtilis, and the pH effect on adsorption was investigated. The results showed that the adsorption characteristics of Cd2+ and Pb2+ are well described by the Langmuir adsorption isothermal equation, and the maximum adsorption amounts for Cd2+ and Pb2+ were 94.340 and 416.667 mg/g, respectively. The maximum removal efficiencies were 97% for Cd2+, 100% for Pb2+, and the desorption rate was smaller than 3%. Further experiments revealed that the biogenic CaCO3 could maintain its high adsorption capability for heavy metals within wide pH ranges (3–8). The FTIR and XRD results showed that, after the biogenic CaCO3 adsorbed Cd2+ or Pb2+, it did not produce a new phase, which indicated that biogenic CaCO3 and heavy metal ions were governed by a physical adsorption process, and the high adsorptive capacity of biogenic CaCO3 for Cd2+ and Pb2+ were mainly attributed to its large total specific surface area. The findings could improve the state of knowledge about biogenic CaCO3 formation in the environment and its potential roles in the biogeochemical cycles of heavy metals.

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Section: Methodsmentioning

confidence: 99%

Adsorption and Desorption Characteristics of Cd2+ and Pb2+ by Micro and Nano-sized Biogenic CaCO3

et al. 2018

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“…A bioflocculant dose of 374 mg/L (acting at pH 6 for 40 min) allowed 90% removal for both Zn 2+ and Cu 2+ , 65% for Ni 2+ , and only 30% for Cr 6+ [22]. In addition, Yao et al (2013) [77] reported significant removal of Fe 3+ and Pb 2+ from wastewater using B. mucilaginosus bioflocculant. Interestingly, heavy metals were removed by adsorption and by the formation of carbonate minerals in the presence of CO 2 , which can cause waste disposal problems [77].…”

Section: Microbial Flocculants For Heavy Metal Removalmentioning

confidence: 98%

“…In addition to organic pollutant removal, microbial bioflocculants were shown to be able to remove metals from an ion solution and real wastewater, as represented in Table 5 [17,22,34,44,[74][75][76][77][78][79]. Among the works using real wastewater, a bacterial culture broth of two strains (xn11 + xn7) was used to flocculate electroplating wastewater (Cr (VI) initial concentration of 280 mg/L).…”

Section: Microbial Flocculants For Heavy Metal Removalmentioning

confidence: 99%

“…In addition, Yao et al (2013) [77] reported significant removal of Fe 3+ and Pb 2+ from wastewater using B. mucilaginosus bioflocculant. Interestingly, heavy metals were removed by adsorption and by the formation of carbonate minerals in the presence of CO 2 , which can cause waste disposal problems [77]. Another microbial bioflocculant showed maximum removal efficiency of arsenic (84.6%) and arsenite (98.9%) from synthetic wastewater [78].…”

Section: Microbial Flocculants For Heavy Metal Removalmentioning

confidence: 99%

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Microbial Flocculants as an Alternative to Synthetic Polymers for Wastewater Treatment: A Review

2018

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Microorganisms such as bacteria, fungi, and microalgae have been used to produce bioflocculants with various structures. These polymers are active substances that are biodegradable, environmentally harmless, and have flocculation characteristics. Most of the developed microbial bioflocculants displayed significant flocculating activity (FA > 70–90%) depending on the strain used and on the operating parameters. These biopolymers have been investigated and successfully used for wastewater depollution in the laboratory. In various cases, selected efficient microbial flocculants could reduce significantly suspended solids (SS), turbidity, chemical oxygen demand (COD), total nitrogen (Nt), dye, and heavy metals, with removal percentages exceeding 90% depending on the bioflocculating materials and on the wastewater characteristics. Moreover, bioflocculants showed acceptable results for sludge conditioning (accepted levels of dry solids, specific resistance to filtration, moisture, etc.) compared to chemicals. This paper explores various bioflocculants produced by numerous microbial strains. Their production procedures and flocculating performance will be included. Furthermore, their efficiency in the depollution of wastewater will be discussed.

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“…Some scholars pay close attention to the use of the adsorbance ability of metabolites produced by microbial fermentation, such as microbial flocculants (MBFs), to remove heavy metals. For example, Yao et al (2013) used MBF produced by the flocculant-producing bacteria Bacillus mucilaginosus to treat wastewater containing Fe (III) and Pb(II) and introduced CO 2 to enhance the removal effect. They found that MBF has an adsorption effect on metal ions and can also be used as a nucleating medium for the formation of carbonate minerals via reaction with CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Microbial flocculant produced by a novel Paenibacillus sp., strain A9, using food processing wastewater to replace fermentation medium and its application for the removal of Pb(II) from aqueous solution

Jiang

Cao³

et al. 2019

Adsorption Science & Technology

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Due to high production costs, the popularization and application of microbial flocculants in the field of water treatment have been limited. In this study, the capture of lead ions by the fermentation broth of a novel Paenibacillus sp. strain A9 and cultured with food wastewater was further investigated. The results revealed that the production of MBFA9 could be increased significantly by adding a small amount of carbon and nitrogen to food wastewater. Under the best experimental conditions (pH 8.5, culture temperature 30°C, 150 r/min), adding 1% (m/v) carbon and 0.1% (m/v) nitrogen to 1% (v/v) wastewater resulted in a yield of MBFA9 of 6.29 g/l. At a temperature of 30°C, pH of 5, contact time of 35 min, and FBA9 dosage of 5%, the removal rate and removal capacity of Pb(II) reached the highest values of 95.1% and 317 mg/g, respectively. Field emission scanning electron microscopy analysis indicated that bacterial cells, metabolite small molecule acids, and MBFA9 in FBA9 all contributed to the removal of Pb(II). Fourier-transform infrared spectrometry analysis indicated that functional groups such as –OH, –COOH, –CO, and –NH2 existed in MBFA9 and on the cell surface. Various mechanisms involved in Pb(II) removal can occur simultaneously, including cell surface adsorption, microcrystallization, and biological flocculation.

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Iron and lead ion adsorption by microbial flocculants in synthetic wastewater and their related carbonate formation

Cited by 13 publications

References 28 publications

Adsorption and Desorption Characteristics of Cd2+ and Pb2+ by Micro and Nano-sized Biogenic CaCO3

Adsorption and Desorption Characteristics of Cd2+ and Pb2+ by Micro and Nano-sized Biogenic CaCO3

Microbial Flocculants as an Alternative to Synthetic Polymers for Wastewater Treatment: A Review

Microbial flocculant produced by a novel Paenibacillus sp., strain A9, using food processing wastewater to replace fermentation medium and its application for the removal of Pb(II) from aqueous solution

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