Preparation and application of oxygen slow-releasing materials for in situ manganese removal from groundwater
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To improve the dissolved oxygen of groundwater for in situ manganese removal, we prepared oxygen slow-releasing materials calcium peroxide/paraffin wax (CaO2/PW) by a physical mixing method under heating conditions. The properties of CaO2/PW were investigated by oxygen-releasing experiments under dynamic conditions and filtration experiments. The surface microstructures were characterized using scanning electron microscopy and energy-dispersive spectrometry. CaO2/PW exhibited good oxygen-releasing performance and effective pH control ability. Moreover, CaO2/PW met the requirement of dissolved oxygen when the water flow velocity was 39.77 m/h, the initial dosage was 4 g/L, and the calcium peroxide:paraffin wax:kaolin:river sand weight ratio was 1.67:50:2:30. Under the influence of flow velocity, the initial dosage, and raw material ratio, the Elovich equation well fitted oxygen release with correlation coefficients above 0.9567. The release kinetic equation of CaO2/PW was determined on MATLAB. In situ simulation experiments confirmed the feasibility and effectiveness of CaO2/PW for in situ manganese removal from groundwater. This study can be used as a reference for practical application of this technology for groundwater restoration.
KeywordsOxygen slow releasing In situ manganese removal CaO2 Paraffin wax Groundwater
This present work was financially supported by National Natural Science Foundation of China (Grant No. 41472214), the China Postdoctoral Science Foundation (No. 2017M621214), also supported by Open Funds of the Key Lab of Groundwater Resources and Environment of Ministry of Education and the Science and Technology Projects of the Ministry of Housing and Urban–rural development (No. 2017-K7-003).
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Conflict of interest
The authors declare that there is no conflict of interests regarding the publication of this paper.
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