Effects of typical modified passivators on speciation of heavy metals in protein extracted from sewage sludge

Wang, Weiyun; Zhang, Jin; Li, Xueshen; Zang, Ying; Li, Rundong

doi:10.1007/s11356-019-04393-x

Cited by 12 publications

(7 citation statements)

References 31 publications

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“…OF is rich in both organic matter and beneficial microorganisms [30,31]. Organic matter highly correlates with soil Cd availability and migration via adsorption, chelation, and complexation [8]. The hydrophilic components of organic matter could bind to Cd 2+ in soil, change the absorption capacity of soil particles to Cd 2+ , and increase the availability of Cd 2+ [32].…”

Section: Discussionmentioning

confidence: 99%

“…The methods to reduce Cd pollution in soil mainly include physical, chemical, biological, agroecological, and combined technologies [7]. As a typical chemical technology, passivation technology has been widely used in the remediation of Cd-polluted soil due to its advantages of low cost, simple operation, and less harm to soil [8]. Studies have shown that the cadmium removal rates of red mud at 35 • C and pH 9 are 97.31% and 96.20%, respectively [9].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In Situ Toxicity Reduction and Food Safety Assessment of Pak Choi (Brassica campestris L.) in Cadmium-Contaminated Soil by Jointly Using Alkaline Passivators and Organic Fertilizer

Jiao,

Li,

et al. 2023

Toxics

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An economical and effective method is still lacking for cadmium (Cd) toxicity reduction and food product safety improvement in soil–vegetable systems. Therefore, this study aimed to reduce the Cd toxicity to pak choi (Brassica campestris L.) by jointly using passivators and organic fertilizer, highlighting food products’ safety based on pot experiments. The results showed that compared with the control, organic fertilizer decreased the Cd content in edible parts and the soil’s available Cd by 48.4% and 20.9% on average, respectively, due to the 0.15-unit increases in soil pH. Once jointly applied with passivators, the decrements increased by 52.3–72.6% and 32.5–52.6% for the Cd content in edible parts and for the soil’s available Cd, respectively, while the pH increment increased by 0.15–0.46 units. Compared with the control, the transport factor of Cd was reduced by 61.9% and 50.9–55.0% when applying organic fertilizer alone and together with the passivators, respectively. The combination treatment of biochar and organic fertilizer performed the best in decreasing the Cd content in the edible parts and the soil’s available Cd. The combination treatment of fish bone meal and organic fertilizer induced the greatest increases in soil pH. The grey relational analysis results showed that the combination treatment of biochar and organic fertilizer performed the best in reducing the potential Cd pollution risk, thereby highlighting the vegetable food safety. This study provides a potential economical and effective technology for toxicity reduction and food safety in Cd-polluted soil.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In Situ Toxicity Reduction and Food Safety Assessment of Pak Choi (Brassica campestris L.) in Cadmium-Contaminated Soil by Jointly Using Alkaline Passivators and Organic Fertilizer

Jiao,

Li,

et al. 2023

Toxics

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“…In recent years, protein extraction from sludge has attracted considerable attention. Protein accounts for about 40 ~ 60% of the remaining sludge dry weight (Wang et al 2019). The steps for protein recovery from excess sludge usually include screening, treatment, ltration, precipitation, drying, recovery, characterization and identi cation (Boleij et al 2018, Seviour et al 2019, Xiao et al 2017.…”

Section: Introductionmentioning

confidence: 99%

Protein extraction from excess sludge by barium hydroxide hydrolysis process

Hui

Jin

2023

Preprint

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Protein could be extracted effectively from excess sludge by barium hydroxide (Ba(OH)2) hydrolysis process. During the extraction process, insoluble protein in sludge was turned into soluble protein, and part of the soluble protein were hydrolyzed into peptide, amino acids, water, carbon dioxide and ammonium. To obtain the maximum concentration of soluble protein, the effects of barium hydroxide, temperature and time on the hydrolysis degree of the sludge protein and protein concentration were investigated. Under optimal conditions of 0.2 M Ba(OH)2, 110 ℃ of the reaction temperature, and 4 h of hydrolysis time, the degree of sludge protein hydrolysis and the protein concentration was 79.10% and 1106.11 mg/L, respectively. Through building a SPSS multiple nonlinear regression model, the optimal protein concentration was calculated. Barium ions were converted into barium sulfate precipitates by adding an equal amount of sulfuric acid in the hydrolysate. Then the precipitates were washed with 0.1 M NaOH to obtain pure barium sulfate and protein solution. Protein was separated and obtained from sludge hydrolysate by centrifugation and filtration, which could be used as a wood binder or foaming agent.

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“…Excess sludge contains large amounts of protein, which accounts for about 20%-60% of dry sludge content (Chen et al, 2007; Vinay and Shang-Lien, 2013; Wang et al, 2019). Protein extracted from excess sludge can be used to prepare protein foaming agents (Su et al, 2015), feed supplements (Chirwa and Lebitso, 2014;Jiyeon et al, 2008) and foliar fertilizers (Liu et al, 2009) and thus allow the effective utilization of sludge with high added value.…”

Section: Introductionmentioning

confidence: 99%

Extraction and Proteolysis of Sludge Protein Using Ultrasound Synergistic Enzymatic Hydrolysis

Liu,

Yan,

Gao

et al. 2023

Preprint

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Protein hydrolysate is critical for the recovery of sludge proteins. Ultrasonic-assisted enzymatic hydrolysis (UEH) is an efficient method for extracting and hydrolysing sludge protein. The process of protein extraction and hydrolysis during UEH and enzymatic hydrolysis (EH) was compared, and it was found that UEH facilitated the extraction of the protein and therefore did not significantly restrict the subsequent hydrolysis of protein as EH did. The extraction of protein conformed to the first-order kinetic equation, and the constants of UEH (k = 1.63 h− 1) were twice those of the EH method. The formation of peptides, an important intermediate product of the proteolytic process, conformed to the tandem kinetic equation, was significantly affected by the dose of enzymes instead of ultrasonic assistance. Further studies on intracellular and extracellular protein extraction and hydrolysis showed that ultrasonic pretreatment effectively reduced the EPS barrier by approximately 50%. Coupled with the synergistic effect of ultrasound and enzyme, the release of intracellular protein was 1.9 times that of EH, which was beneficial to the yield of peptides by removing the restriction in tandem reactions.

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Effects of typical modified passivators on speciation of heavy metals in protein extracted from sewage sludge

Cited by 12 publications

References 31 publications

In Situ Toxicity Reduction and Food Safety Assessment of Pak Choi (Brassica campestris L.) in Cadmium-Contaminated Soil by Jointly Using Alkaline Passivators and Organic Fertilizer

In Situ Toxicity Reduction and Food Safety Assessment of Pak Choi (Brassica campestris L.) in Cadmium-Contaminated Soil by Jointly Using Alkaline Passivators and Organic Fertilizer

Protein extraction from excess sludge by barium hydroxide hydrolysis process

Extraction and Proteolysis of Sludge Protein Using Ultrasound Synergistic Enzymatic Hydrolysis

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