Comparison between electrocoagulation and chemical precipitation for metals removal from acidic soil leachate

Meunier, Nathalie; Drogui, Patrick; Montane, Camille; Häusler, Robert; Mercier, Guy; Blais, Jean-François

doi:10.1016/j.jhazmat.2006.02.050

Cited by 380 publications

(165 citation statements)

References 26 publications

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“…Conventional processes include chemical precipitation [37,38], coagulation/flocculation [39][40][41], and ion exchange [22,42,43]. Adsorptive and membrane processes are widely used for the immobilisation and separation of metal species.…”

Section: Treatments For Metal Removalmentioning

confidence: 99%

Use of Surfactant-Modified Zeolites and Clays for the Removal of Heavy Metals from Water

Jiménez-Castañeda

Medina

2017

Water

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Abstract:The presence of heavy metals in water for human use or consumption represents a major risk to human health. It is therefore important to find materials to remove or minimise the concentration of these pollutants. The adsorption process for the removal of heavy metals is favoured by the use of low-cost materials that exhibit a porous structure and a high cation exchange capacity, such as zeolites and clays. On the other hand, chemical treatments, e.g., using acids and bases, can modify the properties of these materials, but more recently the application of surfactants has also shown to be successful for broadening their metal affinity and allowing the removal of diverse organic and inorganic pollutants from water. This paper reviews the application of modified zeolites and clays for the removal of heavy metals from water.

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Section: Treatments For Metal Removalmentioning

confidence: 99%

Use of Surfactant-Modified Zeolites and Clays for the Removal of Heavy Metals from Water

Jiménez-Castañeda

Medina

2017

Water

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“…Thus a majority of TEs are associated with the solid phase of soil where they occur as precipitate or co-precipitate of mineral salts. Co-precipitation usually occurs with newly formed chemical species such as carbonates, phosphates, oxides and hydroxides [24,25]. These kinds of co-precipitation help to limit exposure of toxic TEs to biota, and also slow down the release of TEs into the soil solution.…”

Section: Nutrient Cycle and Plant Uptake Of Tesmentioning

confidence: 99%

Trace Element Management in Rice

Sebastian¹,

Prasad²

2015

Agronomy

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Trace elements (TEs) are vital for the operation of metabolic pathways that promote growth and structural integrity. Paddy soils are often prone to TE limitation due to intensive cultivation and irrigation practices. Apart from this, rice paddies are potentially contaminated with transition metals such as Cd, which are often referred to as toxic TEs. Deficiency of TEs in the soil not only delays plant growth but also causes exposure of plant roots to toxic TEs. Fine-tuning of nutrient cycling in the rice field is a practical solution to cope with TEs deficiency. Adjustment of soil physicochemical properties, biological process such as microbial activities, and fertilization helps to control TEs mobilization in soil. Modifications in root architecture, metal transporters activity, and physiological processes are also promising approaches to enhance TEs accumulation in grains. Through genetic manipulation, these modifications help to increase TE mining capacity of rice plants as well as transport and trafficking of TEs into the grains. The present review summarizes that regulation of TE mobilization in soil, and the genetic improvement of TE acquisition traits help to boost essential TE content in rice grain.

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“…Global and local agencies have therefore established certain limits on the quantities of heavy metals being that discharged into the environment. The most widely used methods for removing heavy metals are chemical or electrochemical precipitation, both of which pose a significant problem in terms of disposal of the precipitated wastes [2].…”

Section: Introductionmentioning

confidence: 99%

Using of Ceratophyllum demersum L. for Lead and Cadmium Pollution Removal by Columns Technology

Jawad

Abed

Oudah

2018

JBMOA

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Environmental exposure to toxic heavy metals is one of the main critical issues on environmental and public health. Heavy metals are common pollutants in aquatic ecosystems, which are particularly susceptible and often final receptor of heavy metals. Phytoremediation with aquatic plants is a new, effective and inexpensive method for improving water quality and wastewater. In this study, Lead and Cadmium (50ppm) of industrial water polluted were removed by the aquatic plant, Ceratophyllum demersum L., as grinded and crushed. Results showed that grinded plant was the best in removing Lead and Cadmium than crushed plant, so, removing concentration of Lead by Ceratophyllum demersum L. grinded and crushed were (38, 37.8, 37.5, 33.1 and 30.8), (23, 22.5, 22.5, 18.4 and 12.2) ppm and removal percentage (76, 75.6, 75, 66.2 and 61.6), (46, 45, 45, 36.8 and 24.4) % at flow rate (5, 10, 15, 20 and 25) ml/ min respectively. Whereas, removing concentration of Cadmium were (29.5, 29.5, 30, 22.5 and 14.4), (13, 12.5, 12.5, 8.4 and 2.2) ppm and removal percentage (59, 59, 60, 45 and 28.8), (26, 25, 25, 16.8 and 4.4 Adsorption column preparationGlass columns used with a diameter (7 cm) and (50 cm) length filled with grinded and crushed C. dermersum plant. Filter paper was put at the end and the beginning of each column. The two columns are joined with container (5) liter capacity of each, in order to feed the column with polluted water with (Lead and Cadmium) at a flow rate (15ml/min) of first container while the 2 nd for aggregation water after recycle in column at approximately (5,5hrs) impairment time.The biological treatment system design(designed bioremediation system):The form of (Figure 1), which were established in the laboratory for the treatment of water contaminated with heavy metals using a glass column container for each of them grinded and crushed C. demersum L separately. The system is composed of: a. Glass column with a diameter (7cm) and filled with the flora C. demersum L. crushed or grinded (50cm length).b. Iron holder to install column.c. Heavy metals' polluted water with heavy elements tank, (5L) capacity.d. Water tank after treatment (5L) capacity.e. Connecting pipelines; to connect the parts of the system.f. Valves to regulate the flow rate of the contaminated water. Results and Discussion Removal of lead by grinded and crushed of C. demersum L:Removal of lead element with concentration (50 ppm) by grinded and crushed plant C. demersum L. from polluted water by using adsorbent column with different flow rate ranged (5, 10, 15, 20 and 25) ml/min. Results shown that the best removal of a vital element for lead by using grinded C. demersum L. which was obtained at flow rate (5, 10 and 15) ml/min, with percentage of removal (76, 75.5 and 75) %, respectively, whereas, the crushed plant was a decent efficiency in removal the Lead with (46, 45, 45, 36.8 and 24.4) % at flow rate (5, 10, 15, 20 and 25) ml/min, respectively (Table 1) (Figure 2). Phytoremediation, a method to remove pollutants from th...

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Comparison between electrocoagulation and chemical precipitation for metals removal from acidic soil leachate

Cited by 380 publications

References 26 publications

Use of Surfactant-Modified Zeolites and Clays for the Removal of Heavy Metals from Water

Use of Surfactant-Modified Zeolites and Clays for the Removal of Heavy Metals from Water

Trace Element Management in Rice

Using of Ceratophyllum demersum L. for Lead and Cadmium Pollution Removal by Columns Technology

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