Rotating zigzag bed industrial application research on ammonia stripping

In the wastewater emissions, ammonia nitrogen concentration is a very important target which should be strictly controlled because excessive ammonia in the river will cause water eutrophication. Sources of ammonia wastewater include refining, fertilizer, inorganic chemicals, pesticide, ferroalloys, glass, and food industries. Rotating zigzag bed (RZB) has been successfully applied in ∼ 400 cases of industrial distillation. Due to its higher mass transfer rate, it was expected to have a very wide application in wastewater treatment. A laboratory-scale experiment of stripping ammonia from wastewater with RZB was carried out and ammonia solution with a certain concentration was obtained. The experimental results were scaled up to design a unit of RZB successfully used in industrial production. In this system, feed was heated by bottom outlet stream which sensible heat was recovered., thus, the system showed energy-saving effect. This is an abstract of a paper presented at the 2013 AIChE Spring Meeting & 9th Global Congress on Process Safety (San Antonio, TX 4/28-5/2/2013).