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首頁> 外文學(xué)位 >Coupling Bioflocculation of Dehalococcoides to High-Dechlorination Rates for Ex situ and In situ Bioremediation.
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Coupling Bioflocculation of Dehalococcoides to High-Dechlorination Rates for Ex situ and In situ Bioremediation.

機(jī)譯：脫鹵球菌的生物絮凝與高脫氯率的異位和原位生物修復(fù)偶聯(lián)。

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Bioremediation of trichloroethene (TCE) using Dehalococcoides mccartyi-containing microbial cultures is a recognized and successful remediation technology. Our work with an upflow anaerobic sludge blanket (UASB) reactor has shown that high-performance, fast-rate dechlorination of TCE can be achieved by promoting bioflocculation of Dehalococcoides mccartyi -containing cultures. The bioreactor achieved high maximum conversion rates of 1.63 +/- 0.012 mmol Cl- Lculture-1 h-1 at an HRT of 3.6 hours and >97% dechlorination of TCE to ethene while continuously fed 2 mM TCE. The UASB generated bioflocs from a microbially heterogeneous dechlorinating culture and produced Dehalococcoides mccartyi densities of 1.73x10-13 cells Lculture -1 indicating that bioflocculation of Dehalococcoides mccartyi -containing cultures can lead to high density inocula and high-performance, fast-rate bioaugmentation culture for in situ treatment. The successful operation of our pilot scale bioreactor led to the assessment of the technology as an onsite ex-situ treatment system. The bioreactor was then fed TCE-contaminated groundwater from the Motorola Inc. 52nd Street Plant Superfund site in Phoenix, AZ augmented with the lactate and methanol. The bioreactor maintained >99% dechlorination of TCE to ethene during continuous operation at an HRT of 3.2 hours. Microbial community analysis under both experimental conditions reveals shifts in the community structure although maintaining high rate dechlorination. High density dechlorinating cultures containing bioflocs can provide new ways to 1) produce dense bioaugmentation cultures, 2) perform ex-situ bioremediation of TCE, and 3) increase our understanding of Dehalococcoides mccartyi critical microbial interactions that can be exploited at contaminated sites in order to improve long-term bioremediation schemes.
機(jī)譯：使用含有麥卡迪氏脫球菌的微生物培養(yǎng)物對三氯乙烯（TCE）進(jìn)行生物修復(fù)是一種公認(rèn)??的成功修復(fù)技術(shù)。我們在上流式厭氧污泥床（UASB）反應(yīng)器上的工作表明，通過促進(jìn)含Dehalococcoides mccartyi的培養(yǎng)物的生物絮凝，可以實(shí)現(xiàn)TCE的高性能，快速脫氯。該生物反應(yīng)器在3.6小時(shí)的HRT時(shí)實(shí)現(xiàn)了1.63 +/- 0.012 mmol的Cl-Lculture-1 h-1的高最大轉(zhuǎn)化率，并且在連續(xù)進(jìn)料2 mM TCE的情況下，TCE脫氯> 97％。 UASB從微生物異質(zhì)脫氯培養(yǎng)物中產(chǎn)生了生物絮凝物，并產(chǎn)生了1.73x10-13細(xì)胞Lculture -1的Dehalococcoides mccartyi密度，表明含Dehalococcoides mccartyi的培養(yǎng)物的生物絮凝可以導(dǎo)致高密度接種和高性能，快速的生物強(qiáng)化培養(yǎng)原位治療。我們的中試規(guī)模生物反應(yīng)器的成功運(yùn)行導(dǎo)致對該技術(shù)作為現(xiàn)場異位處理系統(tǒng)的評估。然后從亞利桑那州鳳凰城的Motorola Inc. 52nd Street Plant Superfund站點(diǎn)向生物反應(yīng)器供入受TCE污染的地下水，并補(bǔ)充了乳酸和甲醇。在HRT為3.2小時(shí)的連續(xù)運(yùn)行過程中，生物反應(yīng)器將TCE脫氯保持在99％以上。在兩種實(shí)驗(yàn)條件下的微生物群落分析顯示，盡管保持了高速率的脫氯，但群落結(jié)構(gòu)發(fā)生了變化。包含生物絮凝劑的高密度脫氯培養(yǎng)物可提供以下新方法：1）產(chǎn)生致密的生物強(qiáng)化培養(yǎng)物； 2）對TCE進(jìn)行異位生物修復(fù)； 3）增進(jìn)我們對麥加氏脫球菌的關(guān)鍵微生物相互作用的理解，以便在受污染的場地利用微生物改善長期生物修復(fù)方案。

著錄項(xiàng)

  • 作者

    Fajardo-Williams, Devyn.;

  • 作者單位

    Arizona State University.;

  • 授予單位 Arizona State University.;
  • 學(xué)科 Environmental engineering.;Civil engineering.;Microbiology.;Hydrologic sciences.
  • 學(xué)位 M.S.
  • 年度 2015
  • 頁碼 39 p.
  • 總頁數(shù) 39
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類
  • 關(guān)鍵詞

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