This technique could collect phosphor and nitrogen from wastewater and could gain profit while protecting the environment. This method employs chemical precipitation Mg into the wastewater. This precipitation will react with the phosphor and ammonia nitrogen, and eventually form precipitation and reduce the phosphor and ammonia nitrogen in the water. This method could removal the phosphor and ammonia from the wastewater simultaneously, and gain magnesium ammonium phosphate at the same time.

Magnesium ammonium phosphate is a kind of long-effect fertilizer as well as feed additives, fertilizer additives. It could also be used in manufacture medicine, coating etc. This technique is widely applied in high nitrogen and phosphor concentration wastewater.