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| Study on materials and a device for purifying cadmiumpolluted irrigation water |
| Received:November 15, 2015 |
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| KeyWord:cadmium;purification materials;purifying device |
| Author Name | Affiliation | E-mail | | HE Jun-qiang | Ministry of Agriculture Key Laboratory of Crop Nutrition and Fertilization, Agricultural Resources and Regional Planning Institute of Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | LI Ju-mei | Ministry of Agriculture Key Laboratory of Crop Nutrition and Fertilization, Agricultural Resources and Regional Planning Institute of Chinese Academy of Agricultural Sciences, Beijing 100081, China | lijumei@caas.cn | | MA Yi-bing | Ministry of Agriculture Key Laboratory of Crop Nutrition and Fertilization, Agricultural Resources and Regional Planning Institute of Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | JI Xiong-hui | Institute of Soil and Fertilizer, Hunan Academy of Agricultural Sciences, Changsha 410125, China
Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River, Changsha 410125, China | | | ZHAO Hui-wei | The Semi-arid Agriculture Science and Technology Research Center of China, Shijiazhuang 050051, China | |
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| Abstract: |
| Irrigation by using cadmium polluted water is one of the important factors lead to increase Cd content in paddy soil, important materials and a device were studied for purifying Cd polluted irrigation water. Four materials were selected as purifyingagen, that was red mud particles, limestone, zeolite and rape straw. Effect of purifying Cd in water was in order as red mud particles >limestone >zeolite >rape straw >>ceramsite and perlite, and Cd adsorption amount in average range of 344.4~358.2 g·m-3. Cd concentration in purified irrigation water was lower than that of irrigation water security standards of China(GB 5084-2005, 10 μg·L-1) by simulated irrigation duration 3 h, Cd 60 μg·L-1 concentration in irrigation water, a water flow rate 53.3 m3·h-1(40 cm inner diameter circular water section), Cd polluted water purification rate of 83.3% or more. Purifying device described as barrel(inner diameter 40 cm, high 65 cm) with a water inlet and a water outlet, and the barrel filled with composite purifyingagen 56.5 dm3(φ40 cm, high 45 cm), and maximum water flux 64.8 m3·h-1. Cd 15.22~20.14 g could be removed from irrigation water by the purifying device, is expected to deal with 507.2~671.2 m3 of Cd polluted water, meet the demand of 0.13~0.18 hm2 of paddy water purification(irrigation water 3750 m3·hm-2 with Cd 40 μg·L-1). |
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