Fe0协同生物麦饭石的PRB系统井下原位处理煤矿酸性废水

In-situ restoration of acid mine drainage by PRB cooperated with Fe^0 and biological maifan stone

针对煤矿酸性废水(AMD)具有污染组分多、危害程度严重、地面处理成本高等特点,以固定SRB污泥的生物麦饭石作为PRB活性填料,并添加Fe0构建生物-非生物协同去污的新型PRB井下原位修复系统,对AMD开展了连续动态、变负荷的模拟修复研究。实验结果表明,3个动态柱对p H均具有较强的调节能力,同时仅以麦饭石作为活性填料的PRB-3对Fe2+、Mn2+、NH3-N具有较好的去除效果,最大去除速率分别为45.77、9.23和12.10 mg/(L·d);以Fe0协同生物麦饭石的PRB-2在碳源充足时对SO2-4、Fe2+、Mn2+、NH3-N最高去除速率分别为552.29、57.64、14.51和7.05mg/(L·d),而相同条件下只以生物麦饭石作为活性填料的PRB-1对上述污染物的最高去除速率分别为446.62、57.20、10.87和3.53 mg/(L·d);应用PRB-2系统处理AMD不仅可以实现多种污染物的同步去除,还能实现无外加碳源的井下原位长效修复。

Aimed at the characteristics of many contaminated compositions,serious perniciousness,and expensive treatment charge on the ground of acid mine drainage,a new in-situ PRB remediation system was built by the synergy of biology and non-biology system with Fe0 together,to execute a long-time continuous and variable load simulating study on remediation of AMD,where biological maifan stone originally used to fix SRB sewage sludge was taken as the active filler of PRB. The results showed that all three dynamic columns had strong ability to adjust p H. And Column PRB-3 filled with maifan stone only had better removal rates to Fe2 +,Mn2 +and NH3-N,where the maximum removal rates of them were 45. 77,9. 23 and 12. 10 mg /( L · d),respectively. The maximum removal rates of Column PRB-2 constituted with Fe0 and biological maifan stone to SO2-4,Fe2 +,Mn2 +and NH3-N were 552. 29,57. 64,14. 51 and 7. 05 mg /( L·d),respectively,when the carbon resource was sufficient. While under the same conditions,Column PRB-1 filled with biological maifan stone only as active filler had the maximum removal rates to the above contaminants,which were 446. 62,57. 20,10. 87 and 3. 53 mg /( L·d),respectively. Therefore,PRB-2 system can remove contaminated components synchronously,and remedy AMD efficiently in-situ for long time without additional carbon resource.