Changes of heavy metal speciation during high-solid anaerobic digestion of sewage sludge

Dong, Bin; Liu, Xiaoguang; Dai, Lingling; Dai, Xiaohu

doi:10.1016/j.biortech.2012.12.112

Cited by 192 publications

(66 citation statements)

References 33 publications

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“…Many studies have been done on the speciation of heavy metals to assess their environmental hazard [1,34,[50][51][52][53][54]. There was a significant difference in metals speciation between sludges of different origins.…”

Section: Characteristics Of Heavy Metalsmentioning

confidence: 99%

“…Most heavy metals in soil-plant systems are in the form of cations, and tend to form hydroxide co-precipitation as pH increases. Dong et al [50] suggested that the mobile fractions of Cu, Zn, and Pb in an anaerobic digested sludge sample were positively correlated with pH. The contents of the residual fraction increased with the increase of pH.…”

Section: Phmentioning

confidence: 99%

“…The proportions of exchangeable, carbonate-bound, Fe-Mn oxide-bound, and organic matter-bound Ni and Cr decreased, while the proportions of residual Ni and Cr increased substantially, reducing their plant availability and environmental risks. Amir et al [50] concluded that after a composting period of 180 days, the largest proportions of metals were in the residual fraction and fractions more resistant to extraction. The amount of potentially bioavailable metals was less than 2%.…”

Section: Sewage Sludge Compostingmentioning

confidence: 99%

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Immobilization of Heavy Metals in Sewage Sludge during Land Application Process in China: A Review

Zhang

Wang

2017

Sustainability

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Abstract:The safe disposal of sewage sludge during the process of municipal wastewater treatment has become one of the major concerns of increased production. Land application was thought of as a more economical method for sewage sludge disposal than landfill and incineration. However, the presence of heavy metals in sewage sludge restricted the use of land application. The environmental risk of heavy metals was dependent on their contents, chemical speciations, and soil characteristics. Composting and chemical immobilization were the commonly used methods to immobilize the heavy metals in sewage sludge. The immobilization mechanism and speciation transformation of heavy metals during the composting process were presented. Aluminosilicate, phosphorus-bearing materials, basic compounds, and sulfides were reviewed as the commonly used chemical immobilizing agents. The problems that occur during the immobilization process were also discussed. The combination of different methods and the modification of chemical immobilizing agents both improved the fixation effect on heavy metals.

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Section: Characteristics Of Heavy Metalsmentioning

confidence: 99%

Section: Phmentioning

confidence: 99%

Section: Sewage Sludge Compostingmentioning

confidence: 99%

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Immobilization of Heavy Metals in Sewage Sludge during Land Application Process in China: A Review

Zhang

Wang

2017

Sustainability

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“…Sludge sample was digested according to Dong et al (2013). Briefly, a mixture (16 mL) of HCl (36%): HNO 3 (67%): HF (49%) ratio 4:1:1 (v: v: v) was added to 0.5 g of sludge sample.…”

Section: Metal Total Concentrationmentioning

confidence: 99%

Utilization of Sewage Sludge in Agricultural Soil as Fertilizer in the Republic of Benin (West Africa): What are the Risks of Heavy Metals Contamination and Spreading?

Suanon¹,

Tometin²,

Dimon³

et al. 2016

American Journal of Environmental Sciences

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Abstract:Biosolids are the treated organic residuals, also known as sewage sludge, which are generated from domestic wastewater treatment plants. It is an organic matter and nutrients [phosphorous (P) and nitrogen (N)]-rich material. Due to these properties, it is has been reported to be a suitable fertilizer or soil amendment which can valuably replace synthesized NPK. Unfortunately, this matter is heavily loaded with inorganic pollutants, namely heavy metals which limit its land application. Here, we evaluated the quality of treated sewage sludge from Wastewater Treatment Plants (WWTP) in the republic of Benin; and assessed the eco-toxicological risks of heavy metals contamination and spreading related to the use of sludge as fertilizer in agriculture. Results revealed a slightly alkaline (pH ≥6.5) and high electrical conductivity (EC >4 mS cm −1 ) of the sludge. Heavy metals including Cd, Co, Cu, Zn, Ni, Cr, Pb, Fe and Mn contents were at high level: 27.1, 18.6, 777.1, 1271.7, 165.5, 297.0, 131.2, 3184.0 and 394.2 mg kg −1 DM, respectively. Further fractionation of metals showed high mobility of metals classified as follow: Cu > Cd > Pb > Cr > Ni > Fe > Mn > Co > Zn. As a consequence, although the sludge is rich in organic matter and phosphorous, its high value of EC and heavy metals contents, with high mobility do not favor its used in agriculture soils. In addition, metals were enriched in the sludge; meaning that anthropogenic sources, human activities greatly contributed to the accumulation of metals in the sludge.

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“…The pH values 7.1-7.5 (Table 1) were within the permissible range (6.5-8.5) for AD [13]. The increase of pH in MP can be explained by the volatile fatty acids (VFA), converted to CH 4 and CO 2 .…”

Section: Physico-chemical Properties and Heavy Metals In Wastewatermentioning

confidence: 74%

Arsenic Transformation in Swine Wastewater with Low-Arsenic Content during Anaerobic Digestion

Zhai

Qin

Guo

et al. 2017

Water

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Abstract:In this study, the raw wastewater (RW), and effluents from the acidogenic phase (AP) and methanogenic phase (MP) in a swine wastewater treatment plant were collected to investigate the occurrence and transformation of arsenic (As), as well as the abundance of As metabolism genes during the anaerobic digestion (AD) process. The results showed that total concentrations of As generally decreased by 33-71% after AD. Further analysis showed that the As species of the dissolved fractions were present mainly as dimethylarsinic acid (DMA), with arsenite (As(III)) and arsenate (As(V)) as the minor species. Moreover, real-time PCR (qPCR) results showed that As metabolism genes (arsC, arsenate reduction gene; aioA, arsenite oxidation gene and arsM, arsenite methylation gene) were highly abundant, with arsM being predominant among the metabolism genes. This study provides reliable evidence on As biotransformation in swine wastewater treatment process, suggesting that AD could be a valuable treatment to mitigate the risk of As in wastewater.

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Changes of heavy metal speciation during high-solid anaerobic digestion of sewage sludge

Cited by 192 publications

References 33 publications

Immobilization of Heavy Metals in Sewage Sludge during Land Application Process in China: A Review

Immobilization of Heavy Metals in Sewage Sludge during Land Application Process in China: A Review

Utilization of Sewage Sludge in Agricultural Soil as Fertilizer in the Republic of Benin (West Africa): What are the Risks of Heavy Metals Contamination and Spreading?

Arsenic Transformation in Swine Wastewater with Low-Arsenic Content during Anaerobic Digestion

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