| 引用本文: | 董思俊,何钟响,彭 鸥,等.灌溉水净化系统对水体中Cd去除及对稻米降镉效果研究[J].灌溉排水学报,2021,(7):74-80. |
| DONG Sijun,HE Zhongxian,PENG Ou,et al.灌溉水净化系统对水体中Cd去除及对稻米降镉效果研究[J].灌溉排水学报,2021,(7):74-80. |
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| 摘要: |
| 【目的】降低灌溉水中的Cd量，降低稻米和土壤中Cd量。【方法】本研究建立了“植物塘+吸附池”为主体的净化模式，研究其对湖南2种典型矿区(工矿污染、煤矿污染)灌溉水Cd污染的净化效果以及降低稻米Cd积累效果。【结果】监测期间，ST试点（工矿污染）进水全量Cd平均质量浓度为6.86 μg/L，出水全量Cd平均质量浓度为0.81 μg/L，平均去除率为88.19%。DX试点（煤矿污染）进水全量Cd平均质量浓度为4.56 μg/L，出水全量Cd平均质量浓度为1.33 μg/L。平均去除率为70.76%。经过湿地系统处理后，ST灌溉水净化区糙米中的Cd量较未净化灌溉区的水稻相比降低37%，DX灌溉水净化区糙米中的Cd量较未净化灌溉区的水稻相比降低58%。【结论】本研究建立的“植物塘+吸附池”为主体的净化模式可有效去除污染灌溉水中的Cd，并且降低糙米Cd量。 |
| 关键词: 灌溉水；镉；植物塘；矿区稻米 |
| DOI：10.13522/j.cnki.ggps.2020729 |
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| A Constructed Wetland System to Remove Cd from Irrigation Water |
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DONG Sijun, HE Zhongxiang, PENG Ou, HUANG Xinming, WU De, ZHANG Puxin, TIE Boqing
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1.College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China;
2. The Engineering Technology Research Center of Water Pollution Purification of Irrigation Water Source, Changsha 410128, China
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| Abstract: |
| 【Background】Soil and water contamination by heavy metals has become an environmental concern worldwide. In China, wastewater produced from mining or mine-tailings leaching has resulted in heavy metals migrating into downstream water bodies and entering food chains following irrigation with such waters. Removing heavy metals from water prior to irrigation is hence vital to prevent them from ending up in the food chain. 【Objective】The aim of this paper is to present the results of an experimental study on the efficacy of a constructed wetland system to remove Cd from wastewaters emanating from different sources in rice-growing regions in Hunan province.【Method】The system comprises a planted pond and an adsorption pond, and we examined its efficacy by treating two types of wastewater: one was from coal mining (DX) and the other one was industrial wastewater (ST), with Cd concentration in both exceeding the national standard. For each wastewater, we measured its Cd removal rate from the system as well as Cd content in rice grains following irrigation with the two treated wastewaters.【Result】The average Cd concentration in the inflow water was 6.86 μg/L for ST and 4.56 μg/L for DX, and the average Cd concentration in the outflow water was 0.81 μg/L for the former and 1.33 μg/L for the latter. The system was hence more effective for removing Cd from the industrial wastewater than for the coal mining wastewater with the removal rate being 88.13% for the former and 70.76% for the latter. Irrigating brown rice using the treated ST and DX wastewater reduced Cd content in the grains by 37% and 58% respectably, compared to those irrigated with the wastewaters without any treatment. 【Conclusion】 The pilot system comprising a planted pond and an adsorption pond can move Cd from the wastewaters. In terms of removal rate, the system is more effective for industrial wastewater, while in terms of reducing Cd translation into rice grains, it is more effective for treating the coal mine wastewater. |
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