为提高玉米秸秆的综合利用率,笔者研究将玉米秸秆分解为不同部位分别采取稀盐酸和氨水预处理后进行厌氧消化的产气实验,寻找针对不同部位的最佳预处理方式。结果表明,同一部位经过不同方式预处理后产气变化情况有较大差异,对全株秸秆的...为提高玉米秸秆的综合利用率,笔者研究将玉米秸秆分解为不同部位分别采取稀盐酸和氨水预处理后进行厌氧消化的产气实验,寻找针对不同部位的最佳预处理方式。结果表明,同一部位经过不同方式预处理后产气变化情况有较大差异,对全株秸秆的不同部位采用最佳预处理方式处理:茎髓采用稀盐酸处理,叶片、玉米芯采用氨水处理,茎皮不处理,与分别经盐酸预处理、氨水预处理及未预处理的全株样品相比,产气率分别提高了6.72%,6.7%和13.8%,产气潜力达到670.19 m L·g-1TS,说明分部位预处理方法相比传统全株预处理方法对秸秆厌氧发酵有更大优势。此外,不同预处理方法对秸秆厌氧发酵的产气延滞期有较强相关性。展开更多
With the rapid development of rare earth industry in China,high NH3-N and high salts wastewater generated in rare earth manufacture process had caused serious environment pollution especially for surrounding water bod...With the rapid development of rare earth industry in China,high NH3-N and high salts wastewater generated in rare earth manufacture process had caused serious environment pollution especially for surrounding water body.Traditional treatment processes were either incapable of reducing pollutants concentration to the levels regulated by law or prohibitively expensive and difficult to operate.In this paper,a hybrid process which integrated air stripping pretreatment and low pressure reverse osmosis(LPRO) was proposed to treat this wastewater containing high ammonia and salt.Mechanism of treatment and remediation of ammonia and salt polluted water body was investigated.Influences of temperature,pH,and air stripping time on removal ratio of ammonia efficiencies were also discussed.Relationship among trans-membrane pressure drop(ΔP),additions ratio,stability of membrane and the possibility of water reuse were studied.The results showed that removal ratio of ammonia after LPRO desalination process could reach up to 98%,fluoride amounted to more than 99% and desalt efficiencies reached up to 95%,and stripped gas ammonia could be effectively recovered.Water quality had been improved significantly to meet reuse or discharge standards.展开更多
文摘为提高玉米秸秆的综合利用率,笔者研究将玉米秸秆分解为不同部位分别采取稀盐酸和氨水预处理后进行厌氧消化的产气实验,寻找针对不同部位的最佳预处理方式。结果表明,同一部位经过不同方式预处理后产气变化情况有较大差异,对全株秸秆的不同部位采用最佳预处理方式处理:茎髓采用稀盐酸处理,叶片、玉米芯采用氨水处理,茎皮不处理,与分别经盐酸预处理、氨水预处理及未预处理的全株样品相比,产气率分别提高了6.72%,6.7%和13.8%,产气潜力达到670.19 m L·g-1TS,说明分部位预处理方法相比传统全株预处理方法对秸秆厌氧发酵有更大优势。此外,不同预处理方法对秸秆厌氧发酵的产气延滞期有较强相关性。
基金Project supported by the National Special Program on Water (2009ZX07212-01)National Natural Science Foundation of China (20877001)+1 种基金China Postdoctoral Foundation (20070420255)Key Teaching Foundation of Shenyang University of Tchnology (11394)
文摘With the rapid development of rare earth industry in China,high NH3-N and high salts wastewater generated in rare earth manufacture process had caused serious environment pollution especially for surrounding water body.Traditional treatment processes were either incapable of reducing pollutants concentration to the levels regulated by law or prohibitively expensive and difficult to operate.In this paper,a hybrid process which integrated air stripping pretreatment and low pressure reverse osmosis(LPRO) was proposed to treat this wastewater containing high ammonia and salt.Mechanism of treatment and remediation of ammonia and salt polluted water body was investigated.Influences of temperature,pH,and air stripping time on removal ratio of ammonia efficiencies were also discussed.Relationship among trans-membrane pressure drop(ΔP),additions ratio,stability of membrane and the possibility of water reuse were studied.The results showed that removal ratio of ammonia after LPRO desalination process could reach up to 98%,fluoride amounted to more than 99% and desalt efficiencies reached up to 95%,and stripped gas ammonia could be effectively recovered.Water quality had been improved significantly to meet reuse or discharge standards.