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1.The wastewater is being treated at the plant to ensure it's free outfall.
该工厂正在处理废水，以确保其自由排放。
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2. The company has implemented stricter regulations to prevent pollution from the free outfall.
该公司已实施更严格的规定，以防止污染的自由排放。
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3. The city has been working on a plan to reduce the amount of pollutants that escape through the free outfall.
该市一直在努力制定计划，以减少通过自由排放的污染物量。