Optimisation of boric acid production plant wastewater treatment by calcium hydroxide and advanced treatment by ion exchange

IF 5.8 3区环境科学与生态学 0 ENVIRONMENTAL SCIENCES

Environmental Science and Pollution Research Pub Date : 2025-09-01 DOI:10.1007/s11356-025-36885-4

Mustafa Korkmaz, Ahmet Günay

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Abstract

The Emet boric acid production plant in Türkiye produces boric acid from the reaction of colemanite (Ca₂B₆O₁₁·5H₂O) with sulphuric acid (H₂SO₄). Sulphate, arsenic (III + V) and boron are released with the plant wastewater to the wastewater dam. This study aims to treat this boric acid production plant wastewater using calcium hydroxide in a batch reactor. The concentrations of the contaminants were 3956 mg/L sulphate, 2541 mg/L boron and 36.4 mg/L total arsenic (III + V). The boron removal kinetic studies were conducted to obtain the optimum parameter intervals for the application of the central composite experimental design method to remove these contaminants. The optimum conditions in the kinetic studies for boron removal were obtained as natural wastewater pH (5.32–5.68), temperature (20 °C), stirring speed (300 rpm), calcium hydroxide dosage (15 g/L) and time (90 min). Maximum boron removal obtained from the kinetic studies was calculated as 90.7%. The kinetics of boron removal obeyed the second-order model. Sulphate, boron and arsenic removal in the optimisation studies were calculated as 23.94, 87.94 and 98.36% in optimum boron removal conditions, respectively. An ion exchange treatment was applied to the calcium hydroxide treated wastewater containing boron and sulphate residues for ~ 100% removal.

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氢氧化钙和离子交换深度处理硼酸厂废水的优化。

rkiye的Emet硼酸生产装置由colemanite （Ca2B6O11·5H2O）与硫酸（H2SO4）反应生产硼酸。硫酸盐、砷（III + V）和硼随工厂废水一起排放到废水坝。本研究的目的是在间歇式反应器中利用氢氧化钙处理该硼酸厂废水。污染物浓度分别为：硫酸盐3956 mg/L、硼2541 mg/L、总砷36.4 mg/L。通过对硼的去除动力学研究，获得了应用中心复合实验设计方法去除这些污染物的最佳参数间隔。动力学研究的最佳条件为天然废水pH（5.32 ~ 5.68）、温度（20℃）、搅拌速度（300 rpm）、氢氧化钙投加量（15 g/L）和时间（90 min）。动力学研究得到的最大硼去除率为90.7%。脱硼动力学服从二级模型。优化研究中硫酸盐、硼和砷的去除率在最佳脱硼条件下分别为23.94%、87.94%和98.36%。采用离子交换法对氢氧化钙处理后的含硼硫酸渣废水进行了处理，去除率达到100%。

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来源期刊

Environmental Science and Pollution Research 环境科学-环境科学

CiteScore

8.70

自引率

17.20%

发文量

6549

审稿时长

3.8 months

期刊介绍： Environmental Science and Pollution Research (ESPR) serves the international community in all areas of Environmental Science and related subjects with emphasis on chemical compounds. This includes: - Terrestrial Biology and Ecology - Aquatic Biology and Ecology - Atmospheric Chemistry - Environmental Microbiology/Biobased Energy Sources - Phytoremediation and Ecosystem Restoration - Environmental Analyses and Monitoring - Assessment of Risks and Interactions of Pollutants in the Environment - Conservation Biology and Sustainable Agriculture - Impact of Chemicals/Pollutants on Human and Animal Health It reports from a broad interdisciplinary outlook.