Immobilization of heavy metals in sewage sludge by using subcritical water technology

Shi, Wansheng; Liu, Chunguang; Ding, Dahu; Lei, Zhongfang; Yang, Yingnan; Feng, Chuanping; Zhang, Zhenya

doi:10.1016/j.biortech.2013.03.106

Cited by 199 publications

(71 citation statements)

References 33 publications

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“…The contents of heavy metals in the sample original sludge were shown in Table 1. a:reference [4,5,6,7]. As seen from Table 1, the content distribution of various heavy metals in the sludge was similar to that in the sludge of the same kind reported in other literatures.…”

Section: Experiments Materialssupporting

confidence: 81%

In Situ Immobilization of Heavy Metals in Sewage Sludge by Microwave Irradiation

Ma¹,

Zhou²,

Lin³

et al. 2017

dteees

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Section: Experiments Materialssupporting

confidence: 81%

In Situ Immobilization of Heavy Metals in Sewage Sludge by Microwave Irradiation

Ma¹,

Zhou²,

Lin³

et al. 2017

dteees

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“…The use of HTC as a first step in the P extraction process is beneficial because it creates a completely sanitized product with a high heating value, the hydrochar. It also immobilizes the heavy metals contained in the digestate into the solid phase (hydrochar) …”

Section: Potential Developments In Closing Of Materials Cyclesmentioning

confidence: 99%

The replacement of maize (Zea mays L.) by cup plant (Silphium perfoliatum L.) as biogas substrate and its implications for the energy and material flows of a large biogas plant

Cossel

Amarysti

Wilhelm

et al. 2020

Biofuels Bioprod Bioref

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Excessive cultivation of maize (Zea mays L.) as a biogas substrate has fired debate about potential land‐use change effects of bioenergy cropping systems. Cup plant ( Silphium perfoliatum L.) is a perennial biogas crop that provides more environmental services than maize. This study investigated (i) how to replace maize with cup plant as a biogas substrate in a large‐scale biogas plant located in southwest Germany, and (ii) how to optimize the energy and material cycles of such a biogas plant given the new feedstock. The biogas plant produces 1000 m3 biogas per hour with plans for it to be combined with a large dairy farm (1000 dairy units). It was found that the substitution of maize with cup plant as a biogas substrate results in a methane yield reduction of 10% to 20% due to lower biomass yields. However, there exists a strong potential to increase both biomass yields and biogas substrate quality of cup plant by optimizing establishment procedures and better genotypes. Furthermore, cup plant provides food and shelter for open land animals, including birds and insects, and could hence be a suitable alternative to maize for large biogas plants, being more environmentally beneficial. Extracting proteins from cup‐plant biomass could also help replace soy with locally produced protein for feeding cattle. Hydrothermal carbonization is a promising tool for closing nutrient cycles and for extracting phosphate from digestate, but more research is needed before it can be put into practice. © 2020 The Authors. Biofuels, Bioproducts and Biorefining published by Society of Chemical Industry and John Wiley & Sons, Ltd.

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“…At present, various methods for removing or stabilizing heavy metals in sewage sludge and MSWI fly ash have been studied to minimize potential risks to human health and the environment. Heavy metal concentrations in sewage sludge can be reduced by chemical extraction [9], bioleaching [10], supercritical water technology [11] and stabilization [12], while melting, solidification/stabilization, acid extraction, vitrification and sintering have all been used to treat MSWI fly ash [13,14,15]. An effective method proposed for decreasing heavy metals leaching from both sludge and MSWI fly ash is thermal stabilization, which can be achieved using high temperature physicochemical reactions.…”

Section: Introductionmentioning

confidence: 99%

Leachability of Heavy Metals from Lightweight Aggregates Made with Sewage Sludge and Municipal Solid Waste Incineration Fly Ash

Wei

2015

IJERPH

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Lightweight aggregate (LWA) production with sewage sludge and municipal solid waste incineration (MSWI) fly ash is an effective approach for waste disposal. This study investigated the stability of heavy metals in LWA made from sewage sludge and MSWI fly ash. Leaching tests were conducted to find out the effects of MSWI fly ash/sewage sludge (MSWI FA/SS) ratio, sintering temperature and sintering time. It was found that with the increase of MSWI FA/SS ratio, leaching rates of all heavy metals firstly decreased and then increased, indicating the optimal ratio of MSWI fly ash/sewage sludge was 2:8. With the increase of sintering temperature and sintering time, the heavy metal solidifying efficiencies were strongly enhanced by crystallization and chemical incorporations within the aluminosilicate or silicate frameworks during the sintering process. However, taking cost-savings and lower energy consumption into account, 1100 °C and 8 min were selected as the optimal parameters for LWA sample- containing sludge production. Furthermore, heavy metal leaching concentrations under these optimal LWA production parameters were found to be in the range of China’s regulatory requirements. It is concluded that heavy metals can be properly stabilized in LWA samples containing sludge and cannot be easily released into the environment again to cause secondary pollution.

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Immobilization of heavy metals in sewage sludge by using subcritical water technology

Cited by 199 publications

References 33 publications

In Situ Immobilization of Heavy Metals in Sewage Sludge by Microwave Irradiation

In Situ Immobilization of Heavy Metals in Sewage Sludge by Microwave Irradiation

The replacement of maize (Zea mays L.) by cup plant (Silphium perfoliatum L.) as biogas substrate and its implications for the energy and material flows of a large biogas plant

Leachability of Heavy Metals from Lightweight Aggregates Made with Sewage Sludge and Municipal Solid Waste Incineration Fly Ash

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