环境工程学报2013，Vol.7Issue(3)：1121-1127,7.
水泥、粉煤灰及DTCR固化/稳定化重金属污染底泥
Stabilization/solidification of heavy metal contaminated sediment using cement, fly ash and DTCR
摘要
Abstract
A cement-fly ash-dithiocarbamate( DTCR) system was used to solidify and stabilize (S/S) river bottom sediments containing heavy metals, the optimum conditions were selected by testing of compressive strength and leaching toxicity. The results demonstrated that with the dosage of cement increased, compressive strength of the solidified products was also enhanced, but the concentration of heavy metals in leachate decreased. When the ratio of cement to dried sediment reached to 0. 6, the compressive strength of the cement solidified products (after 7 d) was higher than the standard value of 0. 98 MPa. Further studies showed that the compressive strengths of solidified products from 7 d and 28 d were 1. 2 MPa and 2. 7 MPa, respectively, when the mass ratio of cement: flyash: sediment was 0. 54: 0. 06: 1. 0, however the leaching concentration of heavy metal increased. When cement: flyash: DTCR: sediment was 0. 54: 0. 06: 0. 012: 1. 0, the compressive strengths of solidified products from 7 d and 28 d could reach to 1. 1 MPa and 2. 1 MPa, respectively. And after handled with the acetic acid buffer solution method the leaching concentration of Cd, Pb,Zn and Cu were 0. 102, 0. 189, 0. 180 and 0. 033 mg/L, respectively.关键词
重金属/污染底泥/水泥/粉煤灰/DTCR/抗压强度/浸出浓度Key words
heavy metal/ contaminated sediment/ cement/ fly ash/ DTCR/ compressive strength/ leaching concentration分类
资源环境引用本文复制引用
谢华明,曾光明,罗文连,王川,黄兢,徐海音,杨朝晖..水泥、粉煤灰及DTCR固化/稳定化重金属污染底泥[J].环境工程学报,2013,7(3):1121-1127,7.基金项目
国家自然科学基金资助项目(30970105和51078131),国家"水体污染控制与治理"科技重大专项(2009ZX07212-001-02) （30970105和51078131）
长沙科技计划重点资助项目(K0802151-31) （K0802151-31）
