Water released by firms in the CTSP (including waste water produced by the optoelectronics industry) is determined not to be acutely toxic.
Type : Park Activities
Post : Environment and Labor Affairs Division
Date : 2011/03/22
Issue to :
Sites : 1
1. It was discovered that prior to December of 2010, the Environmental Protection Administration had not established standards concerning the toxicity of water released from science parks. The EPA did not establish the standards until December 15, 2010, on which date the limits of total toxic organisms and acute biological toxicity were also established.
2. All CTSP park development projects have been approved by the Environmental Protection Administration (EPA). The standards adopted by the CTSP concerning the toxicity of water released from science parks are more stringent than those announced by the EPA. The Qixing Park, for example, has the country's most stringent waste water release standards (see Table 1 for details). Its BOD (10mg/L), SS (10mg/L), and COD (60mg/L, maximum limit) standards are all much more stringent than those to be enforced by the EPA starting in 2016 (BOD 30mg/L, COD 90 mg/L, SS 25 mg/L [maximum limit]). Its heavy metal standards are 0.05-0.7 times more stringent than EPA standards. In addition, its TN standard is 50 mg/L, which has not yet announced by the EPA. The Qixing Park has even had to add 271 additional toxic chemical substances controlled by the Toxic Substance Control Act to the 30 kinds of total toxic organic matter announced by the EPA on December 15, 2010. Despite that, the limit remains at 1.37 mg/L, an indication of the extremely stringent control over the waste water released by the Qixing Park.
3. Previous water toxicity test results show that the waste water released by the optoelectronics-oriented Qixing Park and Taichung Park complies with the established rules:
(1) In 2010, the Administration commissioned the Department of Bioagricultural Science of National Chiayi University to conduct tests on the water released by the Qixing Park. The tests were conducted according to the methods announced by the Environmental Analysis Laboratory. Acute toxicity tests conducted on flowerhorn fish in still water for 96 hours show zero toxicity units, and the same tests conducted on water fleas in still water for 48 hours also show zero toxicity units, an indication that the water is not acutely toxic and complies with the acute bio-toxicity limit of 1.43 revised and announced by the EPA on December 15, 2010 (the higher the TUa value, the higher the toxicity).
(2) The Administration also commissioned the Department of Environmental Engineering of National Chung Hsing University to conduct acute toxicity tests on aquatic organisms with Microtox toxicity testing technology, which uses the photo bacteria of Vibrio fischeri. The bacteria emit fluorescence during metabolism. If any contaminant or environmental condition restricts their normal metabolism, the strength of fluorescence weakens. The stronger the toxicity, the more powerful the restriction and the weaker the detected fluorescent signals . Because the technology is able to quickly detect contaminants, is highly sensitive and relevant to acute toxicity testing conducted on fish, takes a relatively short time to produce results, is highly reproducible, costs less, and is easy to implement, it is used in many countries to determine the toxicity of waste water released. In 2009, three Microtox tests were conducted on the receiving water bodies along the Niuchoukeng ditch and the results were all negative.
(3) Waste water released from the Taichung Park is mostly released by optoelectronics manufacturers (accounting for at least 75% of the total). In 2010, the Administration commissioned a specialized testing institution to conduct three tests to determine the acute bio-toxicity (NIEA B904.11B) and the total toxic organic matter of the water released. The still-water acute toxicity tests on carp returned results indicating the toxicity level to be smaller than one and did not exceed the limit (1.43) established for optoelectronics firms. In addition, the test results also indicated that the total toxic organic matter was N.D., which also did not exceed the limit (1.37 mg/L).
4. The above test results (see Table 2 for details) indicate that the waste water released by the optoelectronics firms in the CTSP complies with the standards revised and announced by the EPA on December 15, 2010 in terms of total toxic organic matter and acute bio-toxicity. With the supervisory authority's rigorous supervision, the impact of the waste water released by the CTSP on the environment may be minimized.
Contact: Wang Shi-qi (Environmental Protection Section, Environmental Safety Division)
Phone number: 04-25658588#7938
Review of Results :