Sustainable landfill leachate treatment: Optimize use of guar gum as natural coagulant and floc characterization

Cheng, Sze Yin; Show, Pau Loke; Juan, Joon Ching; Ling, Tau Chuan; Lau, Beng Fye; Lai, Sai Hin; Ng, Eng-Poh

doi:10.1016/j.envres.2020.109737

Cited by 46 publications

(6 citation statements)

References 44 publications

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“…Plant-based coagulants (especially, Moringa oleifera) have shown significant promise in treating the wastewater emanating from different types of industries [65]. Cheng et al [33] investigated the feasibility of guar gam for sustainable landfill leachate treatment and reported that 22.6% of COD removal could be achieved at guar gum dosage of 44.4 mg/L. The removal of COD efficiency reported by Cheng et al [33] is less than studies conducted using synthetic/inorganic coagulants for leachate treatment.…”

Section: Natural Coagulantsmentioning

confidence: 99%

Revisiting Chemically Enhanced Primary Treatment of Wastewater: A Review

Shewa

Dagnew

2020

Sustainability

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Chemically enhanced primary treatment (CEPT) is a process that uses coagulant and/or flocculant chemicals to remove suspended solids, organic carbon, and nutrients from wastewater. Although it is not a new technology, it has received much attention in recent years due to its increased treatment capacity and related benefits compared to the conventional primary treatment process. CEPT involves both physical and chemical processes. Alum and iron salts are the commonly used coagulants in CEPT. Several types of anionic, cationic, and uncharged polymers are used as flocculants, where poly aluminum chloride (PACL) and polyacrylamide (PAM) are the widely used ones. Some of the coagulants and flocculants used may have inhibitory and/or toxicity effects on downstream treatment and recovery processes. There has been an increasing amount of work on the treatment of wastewaters from various sources using CEPT. These wastewaters can range from municipal/domestic wastewater, combined sewer overflow, landfill leachate, cattle manure digestate to wastewaters from textile industry, pulp and paper mill, slaughterhouse, milk processing plant, tannery and others. In recent cases, CEPT is employed to enhance carbon redirection for recovery and substantially reduce the organic load to secondary treatment processes. CEPTs can remove between 43.1–95.6% of COD, 70.0–99.5% suspended solids, and 40.0–99.3% of phosphate depending on the characteristics of wastewater treated and type of coagulants and/or flocculants used. This article reviews the application, chemicals used so far, removal efficiencies, challenges, and environmental impacts of CEPT.

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Section: Natural Coagulantsmentioning

confidence: 99%

Revisiting Chemically Enhanced Primary Treatment of Wastewater: A Review

Shewa

Dagnew

2020

Sustainability

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“…After the coagulation process, the surface of the coagulant becomes smoother as the small pollutants filled the pores [45]. Besides, agro-wastes with rougher and porous surfaces have a larger surface area [46]. Coagulants with a larger surface area are preferable because they can increase the capability of bridging mechanisms as it has a higher density of adsorption sites [47].…”

Section: Surface Morphology Of Saccharum Officinarummentioning

confidence: 99%

A Novel Natural Active Coagulant Agent Extracted from the Sugarcane Bagasse for Wastewater Treatment

et al. 2022

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The performance of extracted coagulant from the sugarcane bagasse was tested using synthetic wastewater for turbidity removal. Sugarcane bagasse was selected because it is available in abundance as a waste. This study was carried out to analyze the effect of the extraction process in optimizing the active coagulant agent of bagasse as a natural coagulant for optimum turbidity removal. Bagasse was characterized in terms of physical, chemical and morphological properties. The results showed bagasse has very high polysaccharide content which can act as an active coagulant agent together with hemicellulose and lignin. The extraction process for degradation of lignin and hemicellulose was run based on two different solvents (NaOH and H2SO4) with varying concentrations from 2% to 10% at different extraction temperatures varied from 60 °C to 180 °C for various extraction times (0.5 h to 3 h). The optimum polysaccharide content extracted from bagasse was 697.5 mg/mL by using 2% NaOH at 120 °C for 2 h extraction. The coagulation process using extracted bagasse showed the removal of suspended solids up to 95.9% under optimum conditions. The concentration of polysaccharides as the active coagulant agent plays a vital role where high polysaccharides content removes most turbidity at a lower dosage. Bagasse has the potential to be an alternative coagulating agent due to its efficiency, and eco-friendly properties for the treatment of wastewater.

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“…Globally, landfills are still the most used method to dispose of large quantities of solid waste, as it has a relatively low cost (Cheng et al, 2020;Daniel and Bhada-Tata, 2012;Wiszniowski et al, 2006). However, despite their economic advantages over alternative techniques (Renou et al, 2008), landfills generate leachate that contaminates surface and groundwater resources if not properly treated.…”

Section: Application Of Plant-based Natural Coagulants In Landfill Le...mentioning

confidence: 99%

Recent Advancements in Plant-Based Natural Coagulant Application in the Water and Wastewater Coagulation-Flocculation Process: Challenges and Future Perspectives

2022

Global NEST: The International Journal

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<p>Growing environmental awareness coupled with stricter regulations has pushed various industries to look for appropriate technologies to treat wastewater. Natural coagulants have recently been used as part of water and wastewater technologies due to their performance, cost-effectiveness when compared to chemical coagulants, they produce less sludge and are safer for humans. A huge effort has also been taken to find new plant species and ingredients that may be used as natural coagulants, and hence improve the efficacy of existing plant-based natural coagulants. The purpose of this research is to assess the progress of various natural coagulants used for water and wastewater treatment. Besides, several plant-based natural coagulants are also summarized and reviewed. The results reveal that natural coagulants are more successful than chemical coagulants at removing heavy metals and suspended particles from wastewater, with better removal efficiency exceeding chemical coagulants and being more environmentally friendly.</p>

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Sustainable landfill leachate treatment: Optimize use of guar gum as natural coagulant and floc characterization

Cited by 46 publications

References 44 publications

Revisiting Chemically Enhanced Primary Treatment of Wastewater: A Review

Revisiting Chemically Enhanced Primary Treatment of Wastewater: A Review

A Novel Natural Active Coagulant Agent Extracted from the Sugarcane Bagasse for Wastewater Treatment

Recent Advancements in Plant-Based Natural Coagulant Application in the Water and Wastewater Coagulation-Flocculation Process: Challenges and Future Perspectives

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