| 英文摘要 |
Taiwan is one of the major clusters of high-technology manufacture
in the world, including photovoltaic and semiconductor industries. There
are various chemicals used in the industries and may cause significant
pollution when discharging wastewater. The main purpose of this study is
to investigate the pollution characteristics of discharged wastewater from
photovoltaic and semiconductor industries. An expert panel has been set
up to review the current effluent standard and regulatory measure of the
characteristic pollutant in the industries.
In 2006, the output values of TFT-LCD (thin-film transistor
liquid-crystal displayer) and semiconductor manufacture are 66% and
53% of the total of photovoltaic and semiconductor industries,
respectivel y. On the other hands, the corresponding wastewater discharge
flow rates are 85% and 66% of the total of photovoltaic and
semiconductor industries, respectivel y. According to the conclusion of
expert panel, the study should focus on investigating the wastewater
characteristic of TFT-LCD manufacture, semiconductor manufacture, and
wastewater treatment plant of Science Park.
The investigation revealed that ammonia-nitrogen and
orthophosphate concentration in the effluent of the focusing industries are
higher than most industries in Taiwan. We have recommended that
effluent standard should regulate ammonia-nitrogen in priorit y, while
considering the factors like consuming amount of chemicals in the
focusing industries, the toxicit y, the possibility that the chemicals enter
the wastewater, the wastewater treatment efficiency, the environment
impact and the foreign effluent standards. Recommended regulating
values of ammonia-nitrogen concentration for newly founded and already
established factories are 25 and 35 mg/L, respectivel y. It is also
suggested that a buffering period should be given for the already
established factories to cut down of nitrogen-contained chemicals
consumption, monitor the variation of ammonia-nitrogen discharge, and
report to the EPA.
According to the principle of “control and prevention”, it is
suggested that EPA can have a contract with Science Park Administration
and the relevant manufactures. The manufactures shall cut down the
chemicals consumption in the processing as well as the amount
discharged into wastewater. EPA will then regulate the related items of
effluent standard based on the results of the reduction chemicals
consumption, wastewater treatment efficiency and the effluent qualit y.
It is suggested that TFT-LCD and semiconductor manufacturers
(either located at inside or outside of Science Parks) shall monitor the
consumed amount of major chemicals used in the processing and their
discharge into the effluent. The focusing species include IPA, PGMEA,
DMSO and TMAH. This will help reveal the wastewater treatment
efficiency and provide sufficient background data for wastewater qualit y.
Besides, due to the similar processing and wastewater production, it is
also suggested that TFT-LCD manufacture should be classified into the
category “wafer manufacturing, and semiconductor manufacturing
industries” of the current effluent standard. This category, however,
should be renamed as “wafer manufacturing, semiconductor
manufacturing and TFT-LCD manufacturing industries”.
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