摘要
为去除南方稻田土壤重金属Cd超标的主要输入源之一灌溉水中的Cd,构建了"沉砂池+植物塘+人工湿地+吸附池"组合工艺系统。结果表明,根据GB 5084-1992灌溉水质标准,该区灌溉水超标率高达82.69%,且水中可溶态Cd含量较高,平均为56.34%,潜在危害性大。经处理后水中可溶态Cd平均去除率为94.72%,全量Cd平均去除率为94.78%,贡献率主要集中在植物塘。可溶态Cd和全量Cd的去除2个植物塘的贡献率共占70.92%和70.13%。组合工艺可有效地处理去除灌溉水中Cd,且系统依据地势采用无动力自流设计运行费用低,具有较强的推广潜力,可为Cd超标灌溉水的净化与稻田安全生产提供科学参考与数据支持。
In order to remove the Cd in irrigation sewage, which is the main input source of heavy metals Cd in paddy soils in southern China, grit chamber ＋ plant pond ＋ constructed wetland ＋ adsorption tank combined process system was constructed. The results showed that, the over-standard rate of irrigatio n water was 82.69% according to the GB 5084- 1992 irrigation water quality standard, and the content of soluble Cd in water was up to 56.34%, it had potential risk. The average removal rate of soluble Cd and full dose Cd were 94.72% and 94.78% respectively after treatment, and the contribution rate of cadmium （Cd） was mainly concentrated in the plant pond, and the total contribution of the two ponds for soluble and full dose Cd removal was 70.92% and 70.13%. The Cd could effectively remove in irrigation water through the combined technology, and the system was based on the terrain using nonpower gravity flow and designed low costs operation method, with strong promotion potential, which can provide scientific reference and data support for the purification of Cd over-standard irrigation water and the safe production of paddy field.
出处
《水处理技术》
CAS
CSCD
北大核心
2017年第4期94-97,共4页
Technology of Water Treatment
基金
基金项目:农办财函[2014]28号
关键词
植物塘
人工湿地
吸附池
组合工艺
灌溉水
Cd超标
plant pond
constructed wetland
adsorption tank
combined technology
irrigation water
Cd exceeded
