采用高温烧结资源化技术修复TNT红水污染土壤

Restoration of TNT Red Water Contaminated Soil Using High Temperature Sintering Resourcing Technology

为筛选最佳治理技术以解决火炸药行业TNT红水污染土壤问题,研发了高温烧结资源化修复技术。将污染土壤与粘土按体积比(4∶6)混配后在隧道窑烘干段利用焙烧余热烘干26 h,再进入焙烧段焙烧24 h,烧结温度1100℃左右。隧道窑烟气经脱硫脱硝设施处理后由43 m排气筒排入大气。成品砖出窑后自然降温。土壤中的特征污染物-二硝基甲苯磺酸盐完全氧化分解,烧结烟气达标排放,资源化产品符合建材砖的质量标准且无特征污染物残留,满足土壤修复目标值(二硝基甲苯磺酸钠含量100 mg·kg^(-1))的要求。工程应用证明了高温烧结资源化技术修复TNT红水污染土壤的可行性和有效性。

To select an optimum treatment technology to solve the TNT red water contaminated soil problem in explosive industry,the high temperature sintering resourcing technology was developed.Contaminated soil and clay soil were mixed in a volume ratio of 4∶6,dried for 26 h in the drying section of a tunnel kiln by residual heat from the roasting section,and then roasted for 24 h in the roasting section at 1100℃.Sintering tail gas of the tunnel kiln was emitted into ambient air from its 43 m high funnel after treatment of desulfurization and denitrification facilities.Finished bricks were cooled down naturally out of the kiln.The featured pollutant‑dinitrotoluene sulfonate in contaminated soil is completely decomposed,sintering tail gas reaches the emission standards,resource‑based products meet the quality standard of building material bricks without any featured pollutant residue,and soil restoration target(the content of dinitrotoluene sulfonate in soil less than 100 mg·kg^(-1))is met.The effectiveness and practicability of the high temperature sintering resourcing technology in TNT red water contaminated soil restoration was verified through engineering application.