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节约用水,保护水资源是小氮肥厂贯彻《中华人民共和国水污染防治法》的重要内容。铜山化肥厂年产合成氨2万吨,原每小时外排直流冷却水2500吨,其中污水量400～500吨。以每吨氨计,外排直流水800余吨,其中污水量占20％。近几年,该厂在提高水的重复利用率方面取得了初步成效,水的重复利用率已达到75％以上,大大削减了外排量,提高了经济效益和环境效益。
Conserving water and protecting water resources is an important part of the implementation of the “Law of the People’s Republic of China on the Prevention and Control of Water Pollution” in small nitrogen fertilizer plants. Tongshan Fertilizer Plant has an annual output of 20,000 tons of synthetic ammonia. The original line discharges 2,500 tons of DC cooling water per hour, of which the amount of sewage is 400 to 500 tons. In terms of ammonia per ton, there are more than 800 tons of effluent and direct-flow water, of which sewage accounts for 20%. In recent years, the plant has achieved initial results in improving the reuse rate of water. The reuse rate of water has reached more than 75%, which has greatly reduced the amount of emissions and improved the economic and environmental benefits.