What is the ammonia nitrogen concentration in dye production wastewater?
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An examination of various dye manufacturers revealed that the ammonia nitrogen issue is quite prominent. According to the relevant environmental impact assessment approvals, the ammonia nitrogen level in the wastewater discharged by the surface dye industry is only 10–20 mg/L. However, once operations begin, companies, in order to maximize their profits, use large amounts of liquid ammonia, some of which is used as a raw material and some as a buffer. This results in ammonia nitrogen levels at the discharge outlet as high as 300 mg/L. Can this liquid ammonia really be brought under control? For example, can the use of liquid ammonia be reduced in the production of some disperse dyes and reactive dyes?
I have dealt with a lot of printing and dyeing wastewater, and I have never encountered the situation described by the original poster! In our environmental protection industry, once clients use liquid ammonia, we can only find ways to deal with it! The process cannot be changed!