碩士 / 國立交通大學 / 工學院永續環境科技學程 / 102 / High-tech industry was supported and established in Hsinchu by government thirty years ago, and also expanded with the trend of the world. However, when high-tech industry led economy take-off and made better quality of life, environmental issues gradually emphasized by the people. The development of high-tech industry including integrated circuit and optoelectronic industries require a lot of water during manufacturing process. In recent years, many cities followed the successful experience of the Hsinchu Science Park, planning to set up Science Park. The water resource and wastewater generated from producing processes have become an important issue of concern. Although the effluent of factory comply with the national effluent standard, EPA still pay attention to the toxic effluence to aquatic organisms due to the high-tech industry using many emerging chemicals. Therefore, EPA legislated Science Park sewer system effluent standard for biological acute toxicity in 2012. The regulation of effluent not only limited to single water quality item but also supervised by biological indicators.
The biological acute toxicity of influent and effluent between a pilot-scale anoxic-oxic membrane bioreactor (A/O MBR) with addition of carbon source and wastewater treatment plant in high-tech Science Park was investigated, and also finding out the relevance of biological acute toxicity with the item of water quality.
The pilot-scale MBR system was set up at wastewater treatment plant in high-tech Science Park and the pretreated wastewater was pumped into MBR system. The experiment results revealed that the average concentrations of TN and NH4+-N were 40 mg/L and 13.9 mg/L. And average removal efficiency of TN and NH4+-N and SS BOD5 reached about 48% and 75% and 96% and 90.1%, respectively. The Acute Toxic Unit (TUa) of MBR’s influent for Daphnia magna were all above 5, however TUa of effluent were less than 1. It means the treatment of high-tech wastewater using MBR process with addition of carbon source could effectively reduce the acute toxicity of wastewater. Use of multivariate linear regression to compare the relationship of water quality items and biological acute toxicity in influent and effluent between the pilot-scale MBR system and wastewater treatment plant, the R2 and adj-R2 of equation were 95.1% and 87.8%, and the water quality items such as As, Cu, Nitrate, Ammonia, and TN were found to be the main factors to affect the acute toxicity of effluent. Another compared the relationship of water quality items and biological acute toxicity in the same day effluent between the pilot-scale MBR system and wastewater treatment plant, SS, BOD5, As, TN, Ammonia, and TMAH were found to be the main factors to affect the acute toxicity of effluent.
| Identifer | oai:union.ndltd.org:TW/102NCTU5087094 |
| Date | January 2014 |
| Creators | Liu, Chiih-Jung, 劉智榮 |
| Contributors | Lin, Jih-Gaw, 林志高 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 64 |
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