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Abstract
To improve the pH of groundwater for in situ manganese removal, we prepared high-performance and long-life alkali sustained-release materials (ASRMs) from calcium oxide (CaO) and cement (CEM) by a physical mixing method. The ASRMs were tested by alkali-releasing experiments under dynamic conditions and filtration experiments. Surface microstructures were characterized using scanning electron microscopy and energy-dispersive spectrometry. ASRMs exhibited high alkali-releasing performance and effective pH controllability. The optimal matching conditions were flow rate of 5.0 ml/min, solid–liquid ratio of 13.5 g/l, and CaO:CEM weight ratio of 1:20. Under the influence of flow velocity, initial dosage and raw material ratio, the Elovich equation well fitted alkali release with correlation coefficients above 0.982476. The release kinetic equation of ASRMs was determined on MATLAB. In these conditions, the ASRMs could release well and maintain the aqueous pH over 9.5, with a long releasing life of 10 days. This study can be referred to for practical application of this technology into groundwater restoration.
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