Citric acid and ethylene diamine tetra-acetic acid as effective washing agents to treat sewage sludge for agricultural reuse

Ren, Xianghao; Yan, Rui; Wang, Hongcheng; Kou, Yingying; Chae, Kyu-Jung; Kim, In Soo; Park, Yong‐Jin; Wang, Aijie

doi:10.1016/j.wasman.2015.07.021

Cited by 62 publications

(23 citation statements)

References 36 publications

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“…Similarly, Ren et al . 5 reported a significant increase in the efficiency of Zn removal from sewage sludge, with increases of the CA concentration over the range of 200–1000 mM.…”

Section: Resultsmentioning

confidence: 99%

“…Soils polluted with heavy metals can be decontaminated through a variety of methods of remediation, such as stabilization, solidification, electroremediation and phytoremediation 4 . Among the techniques of remediation, the simplicity of chemical soil washing, its low cost, short duration and high efficiency, makes it a practical option for metal removal 5 – 7 . The selection of a viable solution is a fundamental determinant of the level of efficiency of extraction in the washing process 3 , 6 , 8 .…”

Section: Introductionmentioning

confidence: 99%

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Central Composite Design Optimization of Zinc Removal from Contaminated Soil, Using Citric Acid as Biodegradable Chelant

Asadzadeh

Maleki-Kaklar

Soiltanalinejad

et al. 2018

Sci Rep

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Citric acid (CA) was evaluated in terms of its efficiency as a biodegradable chelating agent, in removing zinc (Zn) from heavily contaminated soil, using a soil washing process. To determine preliminary ranges of variables in the washing process, single factor experiments were carried out with different CA concentrations, pH levels and washing times. Optimization of batch washing conditions followed using a response surface methodology (RSM) based central composite design (CCD) approach. CCD predicted values and experimental results showed strong agreement, with an R2 value of 0.966. Maximum removal of 92.8% occurred with a CA concentration of 167.6 mM, pH of 4.43, and washing time of 30 min as optimal variable values. A leaching column experiment followed, to examine the efficiency of the optimum conditions established by the CCD model. A comparison of two soil washing techniques indicated that the removal efficiency rate of the column experiment (85.8%) closely matching that of the batch experiment (92.8%). The methodology supporting the research experimentation for optimizing Zn removal may be useful in the design of protocols for practical engineering soil decontamination applications

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“…Similarly, Ren et al . 5 reported a significant increase in the efficiency of Zn removal from sewage sludge, with increases of the CA concentration over the range of 200–1000 mM.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Central Composite Design Optimization of Zinc Removal from Contaminated Soil, Using Citric Acid as Biodegradable Chelant

Asadzadeh

Maleki-Kaklar

Soiltanalinejad

et al. 2018

Sci Rep

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“…However, biological treatments (i.e., bioleaching, aerobic, and anaerobic composting processes) require a longer period of operation and inevitable energy consumption, compared to physical and/or chemical treatments, including membrane separation, chlorination, and thermal treatments, which limit their practical applications for the treatment and disposal of sewage sludge (Chaudry et al 1998;Zorpas et al 2001;Fraissler et al 2009;Zhu et al 2013). Chemical treatments (i.e., chemical extraction and chemical precipitation) has several advantages, including a shorter reaction time, easy operating procedures, and higher removal efficiencies of heavy metals, compared to biological treatments (i.e., bioleaching, aerobic and anaerobic composting processes) (Babel & del Mundo Dacera 2006;Ren et al 2015). Various types of chelating reagents (e.g., ethylenediaminetetraacetic acid [EDTA]), organic acids (e.g., citric acid), and inorganic acids (e.g., hydrofluoric acid) are available for the removal and stabilisation of heavy metals from sewage sludge (Amir et al 2005;Babel & del Mundo Dacera 2006;Ren et al 2015).…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

“…Chemical treatments (i.e., chemical extraction and chemical precipitation) has several advantages, including a shorter reaction time, easy operating procedures, and higher removal efficiencies of heavy metals, compared to biological treatments (i.e., bioleaching, aerobic and anaerobic composting processes) (Babel & del Mundo Dacera 2006;Ren et al 2015). Various types of chelating reagents (e.g., ethylenediaminetetraacetic acid [EDTA]), organic acids (e.g., citric acid), and inorganic acids (e.g., hydrofluoric acid) are available for the removal and stabilisation of heavy metals from sewage sludge (Amir et al 2005;Babel & del Mundo Dacera 2006;Ren et al 2015). Sequential chemical extraction methods, which utilise a series of chemical agents in the sequence of extractants with increasing strength, were found to be effective at removing a wide range of heavy metals compared to the single use of each chemical extractant (Amir et al 2005;Babel & del Mundo Dacera 2006).…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Modified bentonite as a conditioning agent for stabilising heavy metals and retaining nutrients in sewage sludge for agricultural uses

Cheng

Chon

Ren

et al. 2021

Water Science and Technology

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The management and disposal of excess sludge are emerging issues owing to the high costs associated with treatment. In this study, the viability of a modified bentonite was investigated as a conditioning agent for the stabilisation of heavy metals (i.e., Cu, Zn, Cr, Pb, and Cd) and the retention of nutrient species (i.e., total nitrogen (TN), total phosphorous (TP), available nitrogen (available N), and Olsen-phosphorous (Olsen-P)) in sewage sludge for agricultural use. Five grams of modified bentonite resulted in the highest stabilisation rate of heavy metals and strongly contributed to the stabilisation of heavy metals. However, increased amounts of modified bentonite might increase the TN, available N, and TP losses in the conditioned sewage sludge. Through the analytic hierarchy process modelling, optimal concentrations of nutrient species and heavy metals remaining in the conditioned sewage sludge were achieved when the ratio of bentonite to sewage sludge was 1:12.5 (4 g bentonite : 50 g sludge). Moreover, the optimal mixing ratio of the conditioned sewage sludge to the soil (1:2) was suggested for agricultural use. Based on these observations, modified bentonite allowed the sewage sludge to be used as a fertiliser in agriculture by stabilising heavy metals and retaining nutrient species.

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“…As a common metal complexing agent, ethylenediaminetetraacetic acid (EDTA) was often used in sewage sludge treatment and EPS extraction (Bourven, Costa, & Guibaud, ; Fang et al, ; Ren et al, ). Zou, Zhang, Wang, and Li () found that the addition of EDTA could enhance the release of phosphorus from cells during the anaerobic digestion of waste activated sludge, which might result from the damage on cell membrane caused by EDTA.…”

Section: Introductionmentioning

confidence: 99%

Effect on sludge disintegration by EDTA‐enhanced thermal‐alkaline treatment

Liu

Jin

Liu

et al. 2019

Water Environment Research

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Sludge disintegration is an effective pretreatment to enhance the biodegradability of sludge. At present, the thermal-alkaline is one of the most commonly used methods, but it has a massive consumption of energy and chemical reagents. EDTA-enhanced thermal-alkaline treatment was used to strengthen the dewatered sludge disintegration at mid-low temperature in this study. Results showed that the dissolving-out quantity of soluble chemical oxygen demand and the volatile solid (VS) in residual sludge in the EDTA-added group were 14.7% higher and 7% lower than those in control system without EDTA, respectively, indicating that EDTA addition improved the performance of sludge disintegration. The addition of EDTA loosened the floc structure and enhanced the hydrolyzability of dissolved organic matters (DOM) with a narrower distribution of the relative molecular weight. The membrane damage of microbial cells in EDTA-added group reached 73.3% after 120 min, which was much higher than that in the control group (31.9%). EDTA contains a large number of hydrogen bond acceptors and could form hydrogen bonds with alcohols and phenols in solubilization products and DOM. It was speculated that the mechanism of EDTA-enhanced sludge disintegration was related to the formation of hydrogen bonds between EDTA and organic matter inside and outside the cell. © 2019 Water Environment Federation • Practitioner points• The addition of EDTA facilitated the thermal-alkali cracking of dewatered sludge. • EDTA increased the particle size of sludge and enhanced the hydrolysis of DOM. • The strengthening effect mainly occurred at the beginning of TB-EPS dissolving slowly. • Hydrogen bond played important roles in the enhanced disintegration of sludge by EDTA.

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Citric acid and ethylene diamine tetra-acetic acid as effective washing agents to treat sewage sludge for agricultural reuse

Cited by 62 publications

References 36 publications

Central Composite Design Optimization of Zinc Removal from Contaminated Soil, Using Citric Acid as Biodegradable Chelant

Central Composite Design Optimization of Zinc Removal from Contaminated Soil, Using Citric Acid as Biodegradable Chelant

Modified bentonite as a conditioning agent for stabilising heavy metals and retaining nutrients in sewage sludge for agricultural uses

Effect on sludge disintegration by EDTA‐enhanced thermal‐alkaline treatment

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