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首页> 外文会议>Sixth International in Situ and On-Site Bioremediation Symposium, 6th, Jun 4-7, 2001, San Diego, California >REMEDIATION OF SEDIMENTS CONTAMINATED WITH PAHs AND HEAVY METALS USING A SEQUENTIAL BIOSLURRY REACTOR
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REMEDIATION OF SEDIMENTS CONTAMINATED WITH PAHs AND HEAVY METALS USING A SEQUENTIAL BIOSLURRY REACTOR

机译：使用序列生物反应器修复被多环芳烃和重金属污染的沉积物

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S: A lab-scale sequential slurry reactor was developed to remediate sediments contaminated with both polycyclic aromatic hydrocarbons (PAHs) and heavy metals. The sediment was first treated with an aerobic bioslurry reactor containing a PAH-degrading mixed culture and subsequently treated with a sulfur oxidizing bacterium, Thiobacillus thiooxidans AZ11 in a second bioleaching slurry reactor. The results showed that 82.6% of naphthalene and 92.6% of phenanthrene, in solid phase, were removed in 21 days. However, significant fractions of PAHs, 40.0% of naphthalene and 10.3% of phenanthrene were volatilized. No detectable levels of PAHs were found in the liquid phase after 3 days and the highest MPN counts occurred at Day 3 and decreased thereafter. These results suggest that biodegradation was limited by the dissolution of PAHs from sediments. The optimum culture conditions for T. thiooxidans AZ11 were studied. With the decrease in the initial pH, the time to reach a steady state was shortened. The optimum sulfur/sediment ratio was determined to be ≥ 0.04 WAV, and solid content ≥ 30% was inhibitory due to the buffering capacity of the sediment. Under the optimum conditions, the PAH treated sediment was treated in a bioleaching slurry reactor. Results showed that 94% of 3500 mg/kg Zn, 70% of 420 mg/kg Cu, 54% of 105 mg/kg Pb, and 46% of 8.5mg/kg Cd were removed from the sediment in 8 days.
机译：S：开发了实验室规模的连续浆料反应器，以修复被多环芳烃（PAH）和重金属污染的沉积物。沉淀物首先在一个含有PAH降解混合培养物的好氧生物淤浆反应器中处理，然后在第二个生物浸出淤浆反应器中用硫氧化细菌硫氧化硫杆菌AZ11处理。结果显示，在21天中固相去除了82.6％的萘和92.6％的菲。但是，大量的PAHs，40.0％的萘和10.3％的菲挥发了。 3天后在液相中未检测到PAHs的水平，最高MPN计数发生在第3天，此后下降。这些结果表明生物降解受到沉积物中多环芳烃溶解的限制。研究了T.thiooxidans AZ11的最佳培养条件。随着初始pH值的降低，达到稳定状态的时间缩短了。确定的最佳硫/沉积比为≥0.04 WAV，并且由于沉积物的缓冲能力，固体含量≥30％具有抑制作用。在最佳条件下，将PAH处理的沉淀物在生物浸出淤浆反应器中进行处理。结果表明，在8天内从沉积物中去除了3500 mg / kg锌的94％，420 mg / kg铜的70％，105 mg / kg铅的54％和8.5mg / kg镉的46％。

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