Evaluation of the effects of chemically enhanced primary treatment on landfill leachate and sewage co-treatment in publicly owned treatment works

Patel, Harsh; Brazil, Brian; Lou, Helen H.; Jha, M. K.; Luster‐Teasley, Stephanie; Zhao, Renzun

doi:10.1016/j.jwpe.2021.102116

Cited by 14 publications

(8 citation statements)

References 37 publications

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“…In the study presented by Patel [30], it tests several coagulants, including ferric chloride for leachate treatment, showing significant decreases of several pollutants such as total organic carbon and COD.…”

Section: Discussionmentioning

confidence: 99%

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Machine Learning Techniques in the Dosage of Biopolymers and Coagulants for Leachate Treatment

Matovelle¹,

Quinteros²,

Heras³

2023

Preprint

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The leachate discharges generated in sanitary landfills contain many pollutants that are harmful to the environment; treatments are scarce and should be carried out better. The use of coagulation-flocculation processes has been one of the most widely used, but that; Due to the complexity of the characterization of the leachate, the dosing strategy of coagulants and biopolymers needs to be clarified. Therefore, the present study is carried out to determine the doses of coagulants and biopolymers suitable for coagulation-flocculation processes in the treatment of leachates by using computational models of machine learning techniques such as Artificial Neural Networks (ANN); these allow to decrease the operations of the tests of jars in the laboratory; optimizing resources. Through laboratory experimentation, there are real results of the effectiveness of applying biopolymers in leachate treatments at different concentration levels. The laboratory results were taken as input variables for the algorithms used; after the validation and calibration process, we proceeded to estimate predicted data with the computational model, obtaining predictions of optimal doses for treatment with high statistical adjustment indicators. It is verified that the applied coagulation-flocculation treatments reduce the turbidity values in the leachate and contaminants associated with suspended solids. In this way, the jar tests are optimized so that the operational costs decrease without affecting the results of adequate dosing.

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Section: Discussionmentioning

confidence: 99%

“…The concentration of prepared stock solutions of ferric chloride was 8.5 g/L. Application of stock solution is preferred compared to adding solid coagulant for testing since the dissolved coagulants can mix rapidly compared to the solid coagulant [30].…”

Section: Leachate Samplementioning

confidence: 99%

Machine Learning Techniques in the Dosage of Biopolymers and Coagulants for Leachate Treatment

Matovelle¹,

Quinteros²,

Heras³

2023

Preprint

View full text Add to dashboard Cite

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“…It was also observed that when 2.5 M HCl modified CFA was used for leachate treatment, UV absorbance was found to increase beyond optimum dose 400 g/L. Based on a previous study, it is believed to have been caused due to the interaction of aqueous DOM and ferric from the CFA when the pH drops during the adsorption process (Patel et al, 2021). However, this phenomenon did not occur when leachate was treated with CFA sample B modified with 1 M HCl.…”

Section: Concentration (Ng/l)mentioning

confidence: 96%

Separation of Dissolved Organic Matter (DOM) and Per- and Polyfluoro-Alkyl Substances (PFAS) from Landfill Leachate Using Modified Coal Fly-Ash (CFA)

Patel

Greer

Xia

et al. 2022

Preprint

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Per and Poly-fluoroalkyl Substances (PFAS) has been a major subject of research in environmental sector ever since it was found in the environment and blood serums at toxic levels. As landfills are the final disposal method for majority of the waste, PFAS concentration in landfill leachate have been found in the range of few µg/L to mg/L. Only few conventional treatments such as Activated Carbon, Reverse Osmosis, and Ion-Exchange has been proven effective in removing PFAS. However, these treatment methods are proving to be very expensive and generate secondary contamination that needs to be disposed-off or treated. Since the phase out of C8-PFAS compounds, more short chain PFAS compounds are detected in landfill leachate. Hence, an effective treatment strategy is needed to keep up with the rising concentration levels and variety of PFAS compounds. The purpose of this study was to develop a sustainable and cost-effective process using modified Coal Fly-Ash (CFA) that can treat both short chain and long chain PFAS compounds. Previous studies have shown application of CFA in removal of dye and metals from different types of wastewaters. In previous studies CFA was modified to enhance its surface properties, that can improve the adsorption of organic and anionic contaminants. In this study, thermo-chemical modification was used on CFA to remove organic matter and PFAS compounds. Preliminary results showed that, CFA can remove more than 90% UV absorbance, more than 80% TOC and approximately 40% of total PFAS compounds. The maximum adsorption capacity for total PFAS was found to be 84 ng PFAS per g CFA, out of which 70 ng was for short chain PFAS and 14 ng for long chain PFAS compounds. An effective removal of organic matter and PFAS compounds, show a promising application of CFA in leachate treatment. However, further research is needed to analyze the adsorption dynamics, kinetics, post-treatment disposal method, and any possible contamination when mixing CFA with landfill leachate.

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“…S4 Environmental Science: Water Research & Technology Paper N, reducing its permeation through the MD membrane. 13,36 Nevertheless, the dosage of FeCl 3 induced a more notable decline in solution pH but a lower retention of NH 4 + -N in comparison to that of PFS (Fig. S4, ESI †).…”

Section: Effect Of Coagulation On the Physicochemical Properties Of L...mentioning

confidence: 99%

Comparison of different coagulants to improve membrane distillation performance for landfill leachate concentrate treatment

Xia,

Liu,

Cao

et al. 2023

Environ. Sci.: Water Res. Technol.

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Evaluation of the effects of chemically enhanced primary treatment on landfill leachate and sewage co-treatment in publicly owned treatment works

Cited by 14 publications

References 37 publications

Machine Learning Techniques in the Dosage of Biopolymers and Coagulants for Leachate Treatment

Machine Learning Techniques in the Dosage of Biopolymers and Coagulants for Leachate Treatment

Separation of Dissolved Organic Matter (DOM) and Per- and Polyfluoro-Alkyl Substances (PFAS) from Landfill Leachate Using Modified Coal Fly-Ash (CFA)

Comparison of different coagulants to improve membrane distillation performance for landfill leachate concentrate treatment

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