Treatment of per- and polyfluoroalkyl substances in landfill leachate: status, chemistry and prospects

2019 ◽  
Vol 5 (11) ◽  
pp. 1814-1835 ◽  
Author(s):  
Zongsu Wei ◽  
Tianyuan Xu ◽  
Dongye Zhao
Keyword(s):  
Landfill Leachate ◽  
Knowledge Gaps ◽  
Treatment Technologies ◽  
Polyfluoroalkyl Substances

This work critically reviews the occurrence, chemistry, treatment technologies and knowledge gaps for per- and polyfluoroalkyl substances in landfill leachate.

Per- and Polyfluoroalkyl Substances in Landfill Leachate: Patterns, Time Trends, and Sources

2012 ◽  
Vol 46 (21) ◽  
pp. 11532-11540 ◽  
Author(s):  
Jonathan P. Benskin ◽  
Belinda Li ◽  
Michael G. Ikonomou ◽  
John R. Grace ◽  
Loretta Y. Li
Keyword(s):  
Landfill Leachate ◽  
Time Trends ◽  
Polyfluoroalkyl Substances

scholarly journals Investigating the OECD database of per- and polyfluoroalkyl substances – chemical variation and applicability of current fate models

2020 ◽  
Vol 17 (7) ◽  
pp. 498 ◽  
Author(s):  
Ioana C. Chelcea ◽  
Lutz Ahrens ◽  
Stefan Örn ◽  
Daniel Mucs ◽  
Patrik L. Andersson
Keyword(s):  
Environmental Fate ◽  
Chemical Diversity ◽  
Acid Dissociation ◽  
Substantial Part ◽  
Chemical Variation ◽  
Training Set ◽  
Knowledge Gaps ◽  
Diverse Range ◽  
Wide Range ◽  
Polyfluoroalkyl Substances

Environmental contextA diverse range of materials contain organofluorine chemicals, some of which are hazardous and widely distributed in the environment. We investigated an inventory of over 4700 organofluorine compounds, characterised their chemical diversity and selected representatives for future testing to fill knowledge gaps about their environmental fate and effects. Fate and property models were examined and concluded to be valid for only a fraction of studied organofluorines. AbstractMany per- and polyfluoroalkyl substances (PFASs) have been identified in the environment, and some have been shown to be extremely persistent and even toxic, thus raising concerns about their effects on human health and the environment. Despite this, little is known about most PFASs. In this study, the comprehensive database of over 4700 PFAS entries recently compiled by the OECD was curated and the chemical variation was analysed in detail. The analysis revealed 3363 individual PFASs with a huge variation in chemical functionalities and a wide range of mixtures and polymers. A hierarchical clustering methodology was employed on the curated database, which resulted in 12 groups, where only half were populated by well-studied compounds thus indicating the large knowledge gaps. We selected both a theoretical and a procurable training set that covered a substantial part of the chemical domain based on these clusters. Several computational models to predict physicochemical and environmental fate related properties were assessed, which indicated their lack of applicability for PFASs and the urgent need for experimental data for training and validating these models. Our findings indicate reasonable predictions of the octanol-water partition coefficient for a small chemical domain of PFASs but large data gaps and uncertainties for water solubility, bioconcentration factor, and acid dissociation factor predictions. Improved computational tools are necessary for assessing risks of PFASs and for including suggested training set compounds in future testing of both physicochemical and effect-related data. This should provide a solid basis for better chemical understanding and future model development purposes.

Concentrating Per- and Polyfluoroalkyl Substances (PFAS) in Municipal Solid Waste Landfill Leachate Using Foam Separation

2020 ◽  
Vol 54 (19) ◽  
pp. 12550-12559 ◽  
Author(s):  
Nicole M. Robey ◽  
Bianca F. da Silva ◽  
Michael D. Annable ◽  
Timothy G. Townsend ◽  
John A. Bowden
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Landfill Leachate ◽  
Municipal Solid Waste Landfill ◽  
Waste Landfill ◽  
Foam Separation ◽  
Polyfluoroalkyl Substances

Physical Treatment Technologies for Landfill Leachate

2015 ◽  
pp. 250-285 ◽  
Author(s):  
Mohammed J. K. Bashir ◽  
Nurazim Ibrahim ◽  
Muhd Nazmi Ismail ◽  
Muhammad Azan Tamar Jaya
Keyword(s):  
Landfill Leachate ◽  
Cost Effective ◽  
Physical Processes ◽  
Physical Treatment ◽  
Leachate Treatment ◽  
Treatment Processes ◽  
Treatment Technologies ◽  
Pre Treatment ◽  
Living Organisms ◽  
Standard Limit

Landfill leachate is a refractory wastewater and highly polluted with heterogeneous materials which is harmful to the environment and living organisms. Thus, leachate requires efficient treatment system to ensure the quality of final discharge is within the standard limit. Moreover the treatment process must be cost effective in order to be accepted. Many treatment processes were examined for leachate treatment including biological, chemical and physical process. This chapter discuss the treatability of leachate using physical processes such as evaporation, flotation, adsorption, membrane, ultrasonication, air stripping. It can be concluded that physical processes are not recommended to stand alone for leachate treatment. Nevertheless, adsorption and membrane technologies are very effective for post treatment of leachate. Aeration, sedimentation, evaporation, and sonication can be used effectively as pre-treatment processes.

Physical Treatment Technologies for Landfill Leachate

2020 ◽  
pp. 717-753
Author(s):  
Mohammed J. K. Bashir ◽  
Nurazim Ibrahim ◽  
Muhd Nazmi Ismail ◽  
Muhammad Azan Tamar Jaya
Keyword(s):  
Landfill Leachate ◽  
Cost Effective ◽  
Physical Processes ◽  
Physical Treatment ◽  
Leachate Treatment ◽  
Treatment Processes ◽  
Treatment Technologies ◽  
Pre Treatment ◽  
Living Organisms ◽  
Standard Limit

Landfill leachate is a refractory wastewater and highly polluted with heterogeneous materials which is harmful to the environment and living organisms. Thus, leachate requires efficient treatment system to ensure the quality of final discharge is within the standard limit. Moreover the treatment process must be cost effective in order to be accepted. Many treatment processes were examined for leachate treatment including biological, chemical and physical process. This chapter discuss the treatability of leachate using physical processes such as evaporation, flotation, adsorption, membrane, ultrasonication, air stripping. It can be concluded that physical processes are not recommended to stand alone for leachate treatment. Nevertheless, adsorption and membrane technologies are very effective for post treatment of leachate. Aeration, sedimentation, evaporation, and sonication can be used effectively as pre-treatment processes.

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