Sirianuntapiboon Suntud, Boonchupleing Methinee
Department of Environmental Technology, School of Energy Environment and Materials, King-Mongkut's University of Technology Thonburi (KMUTT), Thonkru, Bangmod, Bangkok 10140, Thailand.
J Hazard Mater. 2009 Jul 15;166(1):356-64. doi: 10.1016/j.jhazmat.2008.11.023. Epub 2008 Nov 18.
The removal efficiency of sequencing batch reactor (SBR) system with synthetic industrial estate wastewater (SIEWW) containing Ni(2+) or Pb(2+) was increased with the increase of mixed liquor suspended solids (MLSS). But, the sludge volume index (SVI) of the system was increased up to higher than 100mL/g under MLSS of up to 4000 mg/L. Also, the effluent NO(3)(-) was decreased with the increase of MLSS. The heavy metals (Ni(2+) or Pb(2+)), BOD(5), COD and TKN removal efficiencies of SBR system with SIEWW containing 5mg/L heavy metal (Ni(2+) or Pb(2+)) under MLSS of 3000 mg/L were 83-85%, 96-97%, 95-96% and 83-94%, respectively. The increase of heavy metal (Ni(2+) or Pb(2+)) concentrations of SIEWW from 5 to 50mg/L were not significantly effected to both COD and BOD(5) removal efficiencies (they were reduced by only 4-5%), but they were strongly effected to both TKN and heavy metals removal efficiencies (they were reduced by 15 and 20-30%, respectively). Both Ni(2+) and Pb(2+) could repress the growth of both nitrification and denitrification bacteria. And Ni(2+) was more effective than Pb(2+) to reduce the heavy metals removal efficiency. The SBR system could be applied to treat the industrial estate wastewater (IEWW) containing both Pb(2+) and Ni(2+) even the heavy metals concentrations was up to 5mg/L, but the removal efficiency was quite low and excess bio-sludge did not produce. However, the system efficiency could be increased with the increase of BOD(5) concentration of the wastewater. The Pb(2+), Ni(2+), COD, BOD(5) and TKN removal efficiencies of the system with IEWW containing 500 mg/L BOD(5), 5mg/L Ni(2+) and 5mg/L Pb(2+) under HRT of 3 days were 85.68+/-0.31%, 87.03+/-0.21%, 86.0+/-0.5%, 94.04+/-0.4% and 90.5+/-0.9%, respectively. And the effluent SRT, SS and SVI of the system were 44.7+/-0.6 days, 150+/-6 mg/L and 100mL/g, respectively.
序批式反应器（SBR）系统对含Ni(2+)或Pb(2+)的合成工业园区废水（SIEWW）的去除效率随混合液悬浮固体（MLSS）的增加而提高。但是，在MLSS高达4000mg/L时，系统的污泥体积指数（SVI）增加到高于100mL/g。此外，随着MLSS的增加，出水NO(3)(-)减少。在MLSS为3000mg/L时，含5mg/L重金属（Ni(2+)或Pb(2+)）的SBR系统对SIEWW中重金属（Ni(2+)或Pb(2+)）、BOD(5)、COD和总凯氏氮（TKN）的去除效率分别为83 - 85%、96 - 97%、95 - 96%和83 - 94%。SIEWW中重金属（Ni(2+)或Pb(2+)）浓度从5mg/L增加到50mg/L时，对COD和BOD(5)去除效率的影响不显著（仅降低4 - 5%），但对TKN和重金属去除效率影响较大（分别降低15%和20 - 30%）。Ni(2+)和Pb(2+)都会抑制硝化细菌和反硝化细菌的生长。并且Ni(2+)比Pb(2+)对降低重金属去除效率更有效。SBR系统可用于处理含Pb(2+)和Ni(2+)且重金属浓度高达5mg/L的工业园区废水（IEWW），但去除效率相当低且不产生过量生物污泥。然而，随着废水BOD(5)浓度的增加，系统效率会提高。在水力停留时间（HRT）为3天时，含500mg/L BOD(5)、5mg/L Ni(2+)和5mg/L Pb(2+)的IEWW系统对Pb(2+)、Ni(2+)、COD、BOD(5)和TKN的去除效率分别为85.68±0.31%、87.03±0.21%、86.0±0.5%、94.04±0.4%和90.5±0.9%。该系统的出水污泥龄（SRT）、悬浮物（SS）和SVI分别为44.7±0.6天、150±6mg/L和100mL/g。
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