INTERMITTENT EFFLUENT RECIRCULATION FOR THE EFFICIENT TREATMENT OF LOW STRENGTH WASTEWATER BY AN EGSB REACTOR

INTERMITTENT EFFLUENT RECIRCULATION FOR THE EFFICIENT TREATMENT OF LOW STRENGTH WASTEWATER BY AN EGSB REACTOR
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间歇性废水再循环,通过 EGSB 反应器高效处理低浓度废水

DOI:
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发表时间:
2008
期刊:
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影响因子:
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通讯作者:
K. Syutsubo
K. Syutsubo
中科院分区:
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文献类型:
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作者:
W. Yoochatchaval;A. Ohashi;H. Harada;T. Yamaguchi;K. Syutsubo

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为建立适合低强度废水的甲烷发酵工艺,采用2.0 L EGSB反应器,在COD为0.3 ~ 0.4 g /L的蔗糖基合成废水中,在20℃条件下运行500 d。反应器在启动阶段以EGSB模式运行,出水连续再循环,上升流速为5m /h。然而,由于污泥床中COD浓度较低,EGSB反应器在COD负荷为7.2 - 9.6 kg COD/m 3⋅d时COD去除率不足(50-60%)。因此,我们提出了新的运行模式,在40分钟的循环中切换到UASB模式(无再循环,0.7 m/h上升流速)30分钟,EGSB模式10分钟。并加入硫化钠,使其达到低ORP条件。在该操作中,COD去除率从65%大幅提高到91%。此外,在这种操作模式下,保留污泥的物理性质得到了很好的保持。此外,在20°C下,保留污泥具有适当水平的产甲烷活性(0.2-0.4 g COD/g VSS/天)。
In order to establish the appropriate methane fermentation technology for low strength wastewater, a 2.0 L EGSB reactor was operated at 20°C with 0.3 - 0.4 g COD/L of sucrose-based synthetic wastewater for 500 days. At the start up period, the reactor was operated in EGSB mode with a 5 m/h up flow velocity by continuous effluent recirculation. However, the EGSB reactor exhibited insufficient COD removal (50-60%) at COD loading of 7.2 - 9.6 kg COD/m 3 ⋅day due to the low COD concentration in the sludge bed. Therefore, we proposed the new operation mode by switching to UASB mode (without recirculation, 0.7 m/h up flow velocity) for 30 minutes and EGSB mode for 10 minutes in 40 minutes cycle. Moreover we added sodium sulfide to make the low ORP condition. In this operation, COD removal increased dramatically, from 65% to 91%. Additionally, physical properties of the retained sludge were well maintained in this operation mode. Furthermore, the retained sludge possessed appropriate levels of methanogenic activity (0.2-0.4 g COD/g VSS/ day) at 20°C.
DOI: --
发表时间: 2001
期刊: Water Science and Technology 43・1
影响因子: --
作者:
Shutsubo K.;Sinthurat N.;Ohashi A.;Harada H.
通讯作者: Harada H.
DOI: --
发表时间: 2005
期刊: Environmental Engineering Research. Vol. 42
影响因子: --
作者:
Tatsuya Kawasaki;Akiyoshi Ohashi;Hideki Harada;Kazuaki Shutubo
通讯作者: Kazuaki Shutubo