碩士 / 國立中興大學 / 環境工程學系所 / 99 / Wastewater toxicity of high tech industry is with considerable differences in content and it may not suitable to use traditional water parameters as the control standards. This study used Microtox method to analyze wastewaters from a semiconductor plant in attempted to establish its wastewater effluent toxicity data as well as to explore its biological toxicity effects and mixed effects between the hydrogen peroxide, TMAH and ammonia toxic substances. Furthermore, this study also studied the relationship between conductivity and toxicity by observing how the specific percentage of mixture of contaminants and conductivity affect the toxicity.
Results from this study showed that acidic wastewater and high concentrations hydrogen fluoride wastewater contributed acute toxicity in the semiconductor wastewater treatment. Before being treated, these wastewaters had strong TU5min values than their TU15min value. Among tested samples, the acidic wastewater is the most toxic one and the main contribution to its toxicity was hydrogen peroxide. It can be found under 250 mg H2O2 per liter of wastewater, with 276 mg COD per liter of wastewater, the TU5min toxicity is up to 7.1. It confirmed the hydrogen peroxide is the main source of toxicity.
Results from chemical mixing analysis showed that when H2O2 mix with other substances the toxicities decreased; the mixture of NH4OH showed no acute toxicity, the mixture of TMAH showed increase of toxicity. It inferred to some chemical reactions may happened between TMAH and NH4OH, which resulting an increasing of toxicity. Therefore, for the waste water effluent which including ammonia and excluding H2O2 if it contain TMAH, it will result in a significant increase in toxicity.
Wastewater from resin regeneration which has high conductivity did not have biological acute toxicity. However, increased conductivity might enhance an increasing of toxicity on certain wastewaters. Toxicity of a mixed samples with conductivity 816 μs / cm increased from TU5min value 4.3 to 4.5 when its conductivity was adjusted to 3,080 μs / cm. The increase of conductivity enhance the toxicity, it shows different conductivity values will affect the Microtox test results for the contaminants.
| Identifer | oai:union.ndltd.org:TW/099NCHU5087023 |
| Date | January 2011 |
| Creators | Chun-Ming Wang, 王俊明 |
| Contributors | 洪俊雄 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 67 |
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