Improving heavy metals removal, dewaterability and pathogen removal of waste activated sludge using enhanced chemical leaching

Zhang, Liguo; Chen, Ying; Ma, Caixia; Liu, Lei; Pan, Jingshi; Bi-qing, LI; Wu, Xiaosheng; Wang, Qilin

doi:10.1016/j.jclepro.2020.122512

Cited by 25 publications

(6 citation statements)

References 35 publications

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“…The production of municipal ES increases with the increasing wastewater treatment amounts due to the rapid urbanization and industrialization in China. However, sludge treatment and disposal are extremely expensive, which may contribute to over 50% of the total costs of a wastewater treatment plant (WWTP) 2 . The high amounts of ES produced in wastewater treatment plants poses a problem related with its final disposal.…”

Section: Introductionmentioning

confidence: 99%

Residual and ecological risk assessment of heavy metals in fly ash from co-combustion of excess sludge and coal

Tang

Pan

Li³

et al. 2021

Sci Rep

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Co-combustion of municipal excess sludge (ES) and coal provides an alternative method for disposing ES. The present study aims to investigate the residual and ecological risk of heavy metals in fly ash from co-combustion of ES and coal. The total concentration and speciation distribution of heavy metals, characterization of SEM, EDX, XRD and leaching test were carried out to assess the fly ash in this study. The results showed that the total concentrations of Cu, Zn and Mn were higher than others in fly ash, and most heavy metals were concentrated in fine particles. For Cd, Cr and Pb, the percentages of speciation of F4 and F5 were all over 90%, suggesting the relatively lower leaching toxicity. The leaching percent of all heavy metals was lower than 5% by two diluted HNO3 solutions for fly ash. The potential ecological risks increased with the decrease of particle size of fly ash, and Cd accounted for the main fraction for ecological risk despite of lower concentration in comparison to other measured heavy metals.

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Section: Introductionmentioning

confidence: 99%

Residual and ecological risk assessment of heavy metals in fly ash from co-combustion of excess sludge and coal

Tang

Pan

Li³

et al. 2021

Sci Rep

Self Cite

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“…in sludge was observed (Luukkonen et al, 2020). NaClO at a dose of 2.2 g/L decreased the most probable number of fecal coliform in sludge from 6.9 log units to 0.8 log units, and positive effects on improving dewatering and heavy metal leaching were also observed (Zhang et al, 2020). Higher doses of chemical oxidants are required to achieve the complete inactivation of pathogens in sludge than in sewage (Hu et al, 2021), owing to the protection of microbial cells and extracellular polymeric substances.…”

Section: Chemical Oxidationmentioning

confidence: 95%

Inactivation and risk control of pathogenic microorganisms in municipal sludge treatment: A review

Song

Liu

et al. 2021

Front. Environ. Sci. Eng.

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The rapid global spread of coronavirus disease 2019 (COVID-19) has promoted concern over human pathogens and their significant threats to public health security. The monitoring and control of human pathogens in public sanitation and health facilities are of great importance. Excessive sludge is an inevitable byproduct of sewage that contains human and animal feces in wastewater treatment plants (WWTPs). It is an important sink of different pollutants and pathogens, and the proper treatment and disposal of sludge are important to minimize potential risks to the environment and public health. However, there is a lack of comprehensive analysis of the diversity, exposure risks, assessment methods and inactivation techniques of pathogenic microorganisms in sludge. Based on this consideration, this review summarizes the control performance of pathogenic microorganisms such as enterovirus, Salmonella spp., and Escherichia coli by different sludge treatment technologies, including composting, anaerobic digestion, aerobic digestion, and microwave irradiation, and the mechanisms of pathogenic microorganism inactivation in sludge treatment processes are discussed. Additionally, this study reviews the diversity, detection methods, and exposure risks of pathogenic microorganisms in sludge. This review advances the quantitative assessment of pathogenic microorganism risks involved in sludge reuse and is practically valuable to optimize the treatment and disposal of sludge for pathogenic microorganism control.

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“…Nevertheless, similar performance can be achieved by using aluminum sulfate at a much lower dosage (2.3% on a weight basis as well), to save coagulant consumption . Alternatively, conditioning can be performed by implementing other nonmechanical approaches, such as thermal hydrolysis, ultrasound, , microwave, oxidation, chemical leaching, and focus-pulse conditioning . Also note that significant remediation of PAHs can occur simultaneously in the conditioning section when microwave, oxidation, , or ultrasound , treatments are used.…”

Section: Scrubber Emissionsmentioning

confidence: 99%

Mitigation of Ship Emissions: Overview of Recent Trends

Sarbanha

Larachi

Taghavi

et al. 2023

Ind. Eng. Chem. Res.

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The urgency of reducing flue gas pollution in maritime transport makes it necessary to take a holistic view of its sustainability and environmental impacts. Among the approaches to reducing ship exhaust emissions, marinized gas scrubbers, given their ability to be retrofitted to existing ships, are a central element in the tradeoff against the use of expensive low-sulfur fuels. However, compounding this issue, the priority of reducing greenhouse gas (GHG) emissions in the coming decades poses new challenges to emissions compliance. The use of exhaust gas cleaning systems to remove SO X , NO X , and particulate matter (PM) emissions will be enhanced in the short to medium term by GHG reductions. In this study, the different types of scrubbers for seaborne operation and the potential risks associated with their secondary emissions will be critically reviewed. In addition, NO X reduction systems and recent efforts to reduce CO 2 through onboard carbon capture systems or alternative fuel combustion will also be covered.

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Improving heavy metals removal, dewaterability and pathogen removal of waste activated sludge using enhanced chemical leaching

Cited by 25 publications

References 35 publications

Residual and ecological risk assessment of heavy metals in fly ash from co-combustion of excess sludge and coal

Residual and ecological risk assessment of heavy metals in fly ash from co-combustion of excess sludge and coal

Inactivation and risk control of pathogenic microorganisms in municipal sludge treatment: A review

Mitigation of Ship Emissions: Overview of Recent Trends

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