Desalination Behavior of Calcined Hydrotalcite From Seawater for Preparation of Agricultural Cultivation Solution Using Natural Zeolite

Wajima, Takaaki

doi:10.5539/eer.v4n2p3

Cited by 5 publications

(2 citation statements)

References 33 publications

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“…Mordenite-type natural zeolite obtained from Iizaka mine, Fukushima Prefecture, Japan was used as a natural zeolite sample. The exchangeable cations (ECs) and cation exchange capacity (CEC) of natural zeolite were shown in Table 1 [5,6]. The calcined Ca-Fe LDH was prepared as follows.…”

Section: Samplesmentioning

confidence: 99%

Desalination Behavior of Natural Zeolite in Seawater

Sekihata¹

2021

GEOMATE

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In recent years, it has been considered to secure water and food using seawater desalination technology, and a new simple desalination material for reducing high concentration sodium chloride in seawater is required. In this study, desalting agents were prepared from natural zeolite with addition of calcined Ca-Fe type layered double hydroxide (LDH) to desalinate seawater for agricultural use. Mordenite type natural zeolite from Fukushima, Japan was used. The salinity and pH of seawater used in this study were 3.61% and 8.0, respectively. When more than 250 g/L of natural zeolite was added, the salinity decreased from about 3.56% to about 2.92% (reduction : about 18.0%) after stirring for 1 h. With higher dosage of calcined Ca-Fe LDH, the reduction time of salinity and the increase of pH became faster, while the reduction rate of salinity was almost same and pH value increased. When the mixture was used at the mixing ratio of natural zeolite and calcined Ca-Fe LDH was 5:4, the salinity decreased to 1.0% (reduction : about 70.0%) after stirring for 1 h, and the pH of the solution increased to 9.0 -9.7. Radish sprouts could be harvested using seawater treated with a mixture of natural zeolite and calcined Ca-Fe LDH (5 : 4), while it was not possible to harvest using seawater and seawater treated with natural zeolite with lower addition of calcined Ca-Fe LDH.

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Section: Samplesmentioning

confidence: 99%

Desalination Behavior of Natural Zeolite in Seawater

Sekihata¹

2021

GEOMATE

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“…In previous studies, desalination behaviors of natural zeolite and synthetic zeolite in seawater were examined [4][5][6][7], and seawater was treated with calcined Mg-Al layered double hydroxide (LDH) and natural zeolite in two steps to obtain a solution that can be used for germination of radish sprouts from seawater [8][9][10][11][12]. Furthermore, we have succeeded in cultivating radish sprouts using seawater treated with a mixture of mordenite-type natural zeolite and calcined Ca-Fe LDH (calcination at 500 o C) (mixing ratio of zeolite to LDH =5: 4), which are cheap materials [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Desalination Behaviors From Seawater Using Natural Zeolite and Calcined Ca-Fe Layered Double Hydroxide for Cultivation

Wajima¹

2023

GEOMATE

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In recent years, it has been considered to secure water and food using seawater desalination technology, and a new simple desalination material for reducing the high concentration of sodium chloride in seawater is required. In this study, desalting agents were prepared from natural zeolite, obtained from Kagoshima prefecture, Japan, with the addition of calcined Ca-Fe type layered double hydroxide (LDH), to desalinate seawater for cultivation. By treating with the mixture of natural zeolite and calcined Ca-Fe LDH at a mixing ratio of 5: 4, the salinity could be reduced from 3.61% in seawater to 0.97% by cation exchange reaction of natural zeolite and reconstruction reaction of calcined Ca-Fe LDH, and the pH of the obtained solution is 8.4-9.0. The desalination reaction using this mixture was almost the same regardless of temperature. Radish sprouts, bean sprouts, and mung beans could be harvested using seawater treated with a mixture of natural zeolite and calcined Ca-Fe LDH, while it was not possible to harvest using seawater.

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