New advancement perspectives of chloride additives on enhanced heavy metals removal and phosphorus fixation during thermal processing of sewage sludge

Bairq, Zain Ali Saleh; Li, Rundong; Li, Yanlong; Gao, Hongxia; Sema, Teerawat; Teng, Wenchao; Kumar, Sunel; Liang, Zhiwu

doi:10.1016/j.jclepro.2018.03.276

Cited by 60 publications

(21 citation statements)

References 20 publications

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“…At the same time, the removal efficiency of heavy metals in sewage sludge or ash exhibited an increasing tendency with the addition of chloride, especially in the cases of Cu, Zn, and Pb. MgCl 2 is more effective than KCl in improving the removal efficiency of heavy metals in sewage sludge [56].…”

Section: Incinerationmentioning

confidence: 94%

A review of phosphorus recovery from different thermal treatment products of sewage sludge

Meng

Huang

et al. 2019

Waste Dispos. Sustain. Energy

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Phosphorus (P) is an indispensable element of living organisms and plays an irreplaceable role in the growth of crops. As a non-renewable element, the reserves of phosphorus rock, the primary source of phosphorus in nature, are facing the danger of exhaustion. As a phosphorus-rich solid waste, sewage sludge has gradually become a main renewable phosphorus resource. The combination of effective recycling of phosphorus and innocuous disposal of sewage sludge can not only alleviate the crisis of phosphate rock resources shortage but also reduce the environmental hazards of sewage sludge. This study reviewed the application of thermal treatment in sewage sludge disposal. Besides the advantages of reducing waste volume, decomposing organic pollutants, generating valuable byproducts, it can also significantly promote the recycling of phosphorus. Studies have shown that thermal treatment (incineration, pyrolysis, and hydrothermal) can enrich phosphorus in the products and transform the speciation of phosphorus to increase the bioavailability. The physical and chemical properties of different thermal treatment products and the speciation of phosphorus are different. The transformation and migration of phosphorus affect the efficiency of subsequent phosphorus recovery and reuse. At the same time, this study compared several general phosphorus recovery methods (wet extraction, thermochemical, and electrochemical methods), and further summarized the advantages and disadvantages of various methods and application conditions. This review summarizes recent advances in phosphorus recovery from sewage sludge, identifies challenges and knowledge gaps, and provides the foundation for future research aimed at achieving efficient, economic, and eco-friendly reclamation of phosphorus in sewage sludge.

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Section: Incinerationmentioning

confidence: 94%

A review of phosphorus recovery from different thermal treatment products of sewage sludge

Meng

Huang

et al. 2019

Waste Dispos. Sustain. Energy

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“…Sludge is a solid or semi-solid by-product of domestic, industrial, and storm wastewaters treated through aerobic or anaerobic digestion processes in wastewater treatment plants (WWTPs) (Gardiner et al, 1995;Rogers, 1996;Andersen, 2001;Epstein, 2003;Harrison et al, 2006;Bianchini et al, 2016;Lovingood et al 2018;Saleh Bairq et al, 2018). Sludge may also contain some inputs from farms, such as plant residues and manure (Fytili and Zabanioto, 2008;Seleiman et al, 2013a).…”

Section: Introductionmentioning

confidence: 99%

Recycling sludge on cropland as fertilizer – Advantages and risks

Seleiman

Santanen

Mäkelä

2020

Resources, Conservation and Recycling

197

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“…Thermal treatment of sewage sludge has many advantages such as heat energy reuse, volume reduction, and decomposition of organic pollutants. − Since a considerable amount of P is enriched in the final solids after the thermal treatment, P recovery from the treatment product is promising for the development of sewage sludge treatment technology. − However, direct incineration of sewage sludge produces a large amount of hazardous waste fly ash and reduces the concentration of P retained in bottom ash . Some studies have indicated that P bioavailability of fly ash also decreased when incinerated at over 700 °C. − With this regard, our recent studies introduced a low-temperature combustion method for sewage sludge management.…”

Section: Introductionmentioning

confidence: 99%

Transformation of Phosphorus during Low-Temperature Co-Combustion of Sewage Sludge with Biowastes

Meng

Wang

Wan

et al. 2021

ACS Sustainable Chem. Eng.

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Thermal treatments of phosphorus (P)-rich sewage sludge for efficient P reclamation have recently gained much attention. Our recent research proposed a low-temperature combustion method that can simultaneously target safe waste disposal, fly ash volume reduction, heavy-metal stabilization, P recovery, and energy reuse. To further optimize treatment conditions and gain deeper insights into P speciation, this study systematically characterized P transformation during low-temperature co-combustion of sewage sludge with biowaste by combining X-ray absorption spectroscopy, sequential extraction, and nuclear magnetic resonance spectroscopy analyses. Organic P, phytic acid, and pyrophosphate in the raw feedstock transformed into orthophosphate during low-temperature combustion. With increasing mass fraction of biowaste, low-temperature co-combustion increased the relative abundance of Ca-associated P and decreased the abundance of Fe-associated P. The dominant P species in the produced bottom ash is strongly correlated to the amount and speciation of metals in the feedstock and their affinities to P. The introduction of biowaste altered the enrichment efficiency and availability of P in the ash. The results from this study revealed the effects of combustion conditions and feedstock characteristics on P speciation and provided a fundamental basis for guiding the optimization of the thermal treatment method for eliminating hazardous wastes, reusing energy, and improving P reclamation efficiency.

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New advancement perspectives of chloride additives on enhanced heavy metals removal and phosphorus fixation during thermal processing of sewage sludge

Cited by 60 publications

References 20 publications

A review of phosphorus recovery from different thermal treatment products of sewage sludge

A review of phosphorus recovery from different thermal treatment products of sewage sludge

Recycling sludge on cropland as fertilizer – Advantages and risks

Transformation of Phosphorus during Low-Temperature Co-Combustion of Sewage Sludge with Biowastes

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