Department of Environmental Engineering, National Cheng Kung University, 1 University Road, Tainan City 701, Chinese Taiwan.
Water Sci Technol. 2010;62(2):403-9. doi: 10.2166/wst.2010.284.
This study evaluated TMAH biodegradation under methanogenic conditions. Under methanogenic conditions, a sludge from a full-scale UASB treating TFT-LCD wastewater was able to degrade 2,000 mg/L of TMAH within 10 h and attained a specific degradation rate of 19.2 mgTMAH/gVSS-h. Furthermore, several chemicals including some surfactants, DMSO, and sulfate were examined for their potential inhibitory effects on TMAH biodegradation under methanogenic conditions. The results indicated that surfactant S1 (up to 2%) and DMSO (up to 1,000 mg/L) presented negligible inhibitory effects on TMAH degradation, while surfactant S2 (0.2-1%) might inhibit methanogenic reaction without any TMAH degradation for 3-5 h. At sulfate concentrations higher than 300 mg/L, a complete inhibition of methanogenic reaction and TMAH biodegradation was observed. Results from cloning and sequencing of archaeal 16S rRNA gene fragments showed that Methanosarcina barkeri and Methanosarcina mazei were the dominant methanogens in the UASB treating TMAH-containing TFT-LCD wastewater.
本研究评估了在产甲烷条件下 TMAH 的生物降解。在产甲烷条件下，来自处理 TFT-LCD 废水的全尺寸 UASB 的污泥能够在 10 小时内降解 2000mg/L 的 TMAH，并达到 19.2mgTMAH/gVSS-h 的特定降解速率。此外，还研究了一些化学物质，包括一些表面活性剂、DMSO 和硫酸盐，以评估它们在产甲烷条件下对 TMAH 生物降解的潜在抑制作用。结果表明，表面活性剂 S1（高达 2%）和 DMSO（高达 1000mg/L）对 TMAH 降解的抑制作用可忽略不计，而表面活性剂 S2（0.2-1%）可能在没有任何 TMAH 降解的情况下抑制产甲烷反应 3-5 小时。当硫酸盐浓度高于 300mg/L 时，会观察到产甲烷反应和 TMAH 生物降解完全抑制。古菌 16S rRNA 基因片段的克隆和测序结果表明，Methanosarcina barkeri 和 Methanosarcina mazei 是处理含 TMAH 的 TFT-LCD 废水的 UASB 中的优势产甲烷菌。
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