Wetlands for Wastewater Treatment

Yi, Jie; Martinez‐Guerra, Edith; Gude, Veera Gnaneswar; Magbanua, Benjamin S.; Truax, Dennis D.; Martin, James L.

doi:10.2175/106143016x14696400494650

Cited by 10 publications

(4 citation statements)

References 81 publications

(100 reference statements)

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“…Considering the above, the treatment of polluted effluents before their discharge into water bodies is necessary. Among the technologies used in the removal of contaminants from water, adsorption is widely used due to its simplicity, easy operation, efficiency, insensitivity to toxic contaminants, and selectivity towards pollutants, even at low concentrations [11]. The use of activated carbon is common in adsorption systems because it exhibits characteristic features of higher surface area, porous structure, variable surface chemistry properties, and higher mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

Removal of Metals and Dyes in Water Using Low-Cost Agro-Industrial Waste Materials

2023

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The pollution of water bodies due to the discharge of effluents without treatment is a global problem. Therefore, different technologies have been implemented for the removal of contaminants from wastewater before the final disposition. Among them, adsorption processes using residual biomasses are becoming very popular due to the low cost and high availability of adsorbents. Thus, in the present work, the synthesis of modified biochar from agro-industrial residues derived from the wheat-processing industry, as a valorization alternative of these residues, for its use in the removal of Cr (VI) and methylene blue (MB) has been analyzed. The biochar was prepared using a ramp function of 5 °C/min until 250 °C for 30 min. The adsorption tests were developed in a batch system, using 30 mg of adsorbent in 10 mL of solution. From SEM analysis, the formation of tubular cavities and porous structure was seen, caused by the basic hydrolysis with KOH. From adsorption tests, an adsorption capacity of 12.98 mg/g and 97.38% of efficiency for MB at pH 10 was noted, while for Cr (VI), it was 11.35 mg/g and 85.15% at pH 2. Freundlich’s model adjusted the adsorption equilibrium data with R2 > 0.9. The maximum adsorption capacities in the monolayer were 186,375 mg/g and 90.723 mg/g for Cr (VI) and MB, according to Langmuir’s model. From a kinetic study, it can be said that the process occurs by chemisorption through electrostatic interaction and ionic interchange between adsorbate and adsorbent.

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Section: Introductionmentioning

confidence: 99%

Removal of Metals and Dyes in Water Using Low-Cost Agro-Industrial Waste Materials

2023

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“…Thus, several types of research have expanded on the application of porous materials for turbidity removal by adding coagulants or combining them with other technologies [JIANG et al 2016]. However, turbidity and total suspended solids (TSS) removal capacity are important factors when considering water treatment technologies.…”

Section: Introductionmentioning

confidence: 99%

Journal of Water and Land Development

2022

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The objective of the present work was to evaluate the hydrodynamic behaviour of a stratified bed filtration column consisting of 4 cm of sand and 2 cm of limestone to remove turbidity and measuring the head loss through the filter in several runs. In this study, two types of sand were used as filtering bed material, one fine and one medium. Crushed limestone was also available. These materials were characterized to determine the average particle diameter, porosity, and permeability coefficient. These were respectively 1.7•10 -4 m, 336.96 and 0.68 m•day -1 for fine sand, 3.3•10 -4 m, 654.24 and 2.59 m•day -1 for the medium sand and 1.26•10 -3 m, 388.8 and 8.64 m•day -1 for crushed limestone. Using these materials, hydrodynamic analyses were carried out using clean water under rapid filtration conditions. In these analyses, different filtration rates were determined to be used in each experiment. Once the filtration rates were determined, the filtration analysis was performed with synthetic turbid water prepared at 8 NTU using tap water and bentonite. From the results obtained, a predictive model was developed based on total head losses for the evaluated filter, maintaining the rapid filtration condition. As a result, a turbidity removal efficiency of 97.7% was obtained with a total head loss of 17.8 cm at a filtration rate of 153 m•day -1 . The developed model predicted head loss as a function of operating time, filtration rate, and filter depth to maximise turbidity removal. The model showed excellent prediction accuracy with R 2 of 0.9999, which indicates that the model predictions are not biased. It was concluded that, due to the porosity of these materials, a stratified bed of sedimentary rocks has a great potential to be used in surface water filtration processes, which implies that it could be used at the rural community level as a form of water treatment, since the material is a readily available, maintenance is simple and low cost, and installation and operation are effortless.

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“…Therefore, new technological solutions have emerged to meet these regulations. Constructed Wetlands (CWs) have been investigated (Castillo‐Valenzuela, Martinez‐Guerra, & Gude, 2017; Ghimire, Nandimandalam, Martinez‐Guerra, & Gude, 2019; Jiang et al, 2016; Martinez‐Guerra, Castillo‐Valenzuela, & Gude, 2018; Martinez‐Guerra et al, 2015) as a cost‐effective solution to wastewater treatment.…”

Section: Introduction—wetlands For Environmental Protectionmentioning

confidence: 99%

Wetlands for environmental protection

Martinez‐Guerra

Ghimire

Nandimandalam

et al. 2020

Water Environment Research

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This article presents an update on the research and practical demonstration of wetland-based treatment technologies for protecting water resources and environment covering papers published in 2019. Wetland applications in wastewater treatment, stormwater management, and removal of nutrients, metals, and emerging pollutants including pathogens are highlighted. A summary of studies focusing on the effects of vegetation, wetland design and operation strategies, and process configurations and modeling, for efficient treatment of various municipal and industrial wastewaters, is included. In addition, hybrid and innovative processes with wetlands as a platform treatment technology are presented.

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Wetlands for Wastewater Treatment

Cited by 10 publications

References 81 publications

Removal of Metals and Dyes in Water Using Low-Cost Agro-Industrial Waste Materials

Removal of Metals and Dyes in Water Using Low-Cost Agro-Industrial Waste Materials

Journal of Water and Land Development

Wetlands for environmental protection

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