包裹缓释外壳的缓释氧材料的性能影响分析  

Analysis on Impact Performance of the Slow-released Oxygen Material of the Wrapped Sustained-release Housing

作　　者：李明[1] 朱晓明[1] 阮晓红[2] 尹琳 

机构地区：[1]河海大学环境学院,江苏南京210093 [2]南京大学地球科学与工程学院水科学系,江苏南京210093

出　　处：《地下水》2012年第6期173-175,共3页Ground water

基　　金：长三角浅层地下水氮污染厌氧氨氧控制技术研究(2008AA06Z314);水体污染控制与治理科技重大专项(2009ZX07317-007-02);水体污染控制与治理科技重大专项(2012ZX07204-003-003)

摘　　要：针对地下水水质原位生物修复过程中由于缺乏氧气导致的生物活性降低、修复作用受抑等问题,以过氧化镁(MgO2)为释氧原料,塑性剂、缓冲剂、造孔剂为载体材料,采用共混滚动造粒技术,分别制备出包裹和不包裹缓释外壳的释氧材料(ORC)并进行材料性能对比分析。扫描电镜和静态实验研究表明:粒径在0.6～0.8 cm之间未添加缓释外壳的ORC材料,其机械强度约为14～18 N,固液比投加量2 g/L时,氧释放系数K为0.005 89,氧平衡浓度Cm为10.641 mg/L,材料在实验四个月后溶解氧含量达到峰值后开始逐渐下降;粒径在0.6～0.8 cm之间添加缓释外壳的ORC材料,其机械强度达到30～70 N,液固比投加量2g/L时,氧释放系数K为0.004 66,氧平衡浓度Cm为10.57 mg/L,八个月后溶解氧浓度开始逐渐下降。分析结果表明,添加缓释外壳的ORC材料其强度和释氧周期都有提高。The biological activity reduction and remediation inhibition are common problems of groundwater in-situ bioremediation due to the lack of oxygen.An oxygen release compound(ORC) material was created with taking magnesium peroxide(MgO2) as oxygen donor,binder,buffer as carrier material.The ORC material with or without slow-release shell were prepared by the blending roll granulation technology to compare the material properties.The mechanical strength of ORC material(grain size range from 0.6 to 0.8 cm),without and with slow-release shell were about 14~18N and 30~70N,respectively.The static oxygen release experiment was designed with dosing quantity of 2 g/L.Results showed the oxygen release coefficients(K) of ORC materials without and with slow-release shell were 0.00589 and 0.00466 respectively.The oxygen balance concentrations(Cm) were 10.641 and 10.57 mg/L respectively.The concentration of the dissolved oxygen of ORC material without slow-release shell began to decline gradually after the peak at four months.However,the concentration of dissolved oxygen of ORC material with shell began to decline after eight months.The results show that the mechanical strength,oxygen releasing performance and duration of oxygen release are all well improved for the ORC material with slow-release shell.

关 键 词：ORC释氧材料 缓释外壳 强度 释氧性能 

分 类 号：X523[环境科学与工程—环境工程]