通过现场试验研究了工程规模的短程硝化反应器处理实际味精废水的运行性能.结果表明,短程硝化工艺（Single Reactor High Activity Ammonia Removal Over Nitrite,SHARON）适合处理低浓度味精废水（pH值为9.36-10.49;NH4^＋-N浓度为239....通过现场试验研究了工程规模的短程硝化反应器处理实际味精废水的运行性能.结果表明,短程硝化工艺（Single Reactor High Activity Ammonia Removal Over Nitrite,SHARON）适合处理低浓度味精废水（pH值为9.36-10.49;NH4^＋-N浓度为239.70-341.23mg·mL^-1;COD为1000-1500mg·mL^-1）.短程硝化反应器的硝化性能良好,短程硝化效率（Partial Nitrification Efficiency,PNE）高达94.56%±4.30%;在反应器内pH值为9.25-9.80、游离氨（Free Ammonia,FA）浓度为20-70mg·mL^-1的工况下,短程硝化反应器运行性能稳定,PNE达96.64%±4.73%,出水中（NO2^--N）/（NH4^＋-N）为0.70-1.35,出水pH值稳定在6.50-7.00,适用于后续厌氧氨氧化工艺（Anaerobic Ammonium Oxidation,ANAMMOX）处理.进水FA浓度不宜过低,若反应液中的FA浓度低于20mg·mL^-1,可导致NO3^--N浓度升高,不利于NO2^--N积累.采取一次性投加石灰的方式调节废水碱度,只适用于进水NH4^＋-N浓度较低的情况;若进水NH4^＋-N浓度较高,则会导致进水pH过高而抑制亚硝酸菌生长,宜采用多次投加或分段投加石灰的方式来调节废水碱度.展开更多
A novel process for sulfidation of ZnO by co-grinding with sulfur and reductive additives （P, Fe, A1, and Mg） was developed. The sulfidation extent of ZnO with the addition of P, Fe, A1 or Mg can reach 85.2%, 81.6%,...A novel process for sulfidation of ZnO by co-grinding with sulfur and reductive additives （P, Fe, A1, and Mg） was developed. The sulfidation extent of ZnO with the addition of P, Fe, A1 or Mg can reach 85.2%, 81.6%, 96.7% and 92.6% after grinding for 4, 6, 1 and 1 h, respectively. Based on the chemical phase composition analysis and morphological characteristics of sulfidized products by XRD, SEM and TEM, a possible reaction mechanism, mechanically induced self-propagating reaction （MSR）, was proposed to explain the sulfidization reaction. In addition, the floatability of sulfidized products was investigated for the recovery of metal sulfide and ZnS can be concentrated with a high concentration ratio and concentrate grade. By using the sulfidizing process, it is expected that the recovery of zinc from the wastes or purification of heavy-metal-containing hazardous residues is technically feasible.展开更多
基金Project(50925417) supported by the China National Funds for Distinguished Young ScientistsProject(50830301) supported by the National Natural Science Foundation of China+1 种基金Projects(2010AA065203,2011AA061001) supported by the National High-tech Research Program of ChinaProject(NCET-10-0840) supported by the Program for New Century Excellent Talents in University,China
文摘A novel process for sulfidation of ZnO by co-grinding with sulfur and reductive additives （P, Fe, A1, and Mg） was developed. The sulfidation extent of ZnO with the addition of P, Fe, A1 or Mg can reach 85.2%, 81.6%, 96.7% and 92.6% after grinding for 4, 6, 1 and 1 h, respectively. Based on the chemical phase composition analysis and morphological characteristics of sulfidized products by XRD, SEM and TEM, a possible reaction mechanism, mechanically induced self-propagating reaction （MSR）, was proposed to explain the sulfidization reaction. In addition, the floatability of sulfidized products was investigated for the recovery of metal sulfide and ZnS can be concentrated with a high concentration ratio and concentrate grade. By using the sulfidizing process, it is expected that the recovery of zinc from the wastes or purification of heavy-metal-containing hazardous residues is technically feasible.
