METHOD FOR REUSING MAGNESIUM AMMONIUM PHOSPHATE(MAP) IN TREATMENT OF WASTEWATER CONTAINING NITROGEN

摘要

PURPOSE: A treatment method is provided, which is characterized in that magnesium ammonium phosphate(MAP) generated from waste water treatment containing nitrogen is recycled for treating waste water containing nitrogen in short time. CONSTITUTION: The method is composed of following processes. Recycling process of MAP(S10) is to collect crystal of MAP. Recycled crystal of MAP is heated in separation process of ammonia(S12), then, crystal of MAP is separated to ammonia gas and magnesium hydrogen phosphate(MHP). Dissolution process of MHP(S14) is to product solution containing magnesium ion and phosphate ion together by dissolving MHP in hydrochloric acid. Crystallization process of MAP(S16) is that solution containing magnesium ion and phosphate ion together is injected into waste water containing ammonium-nitrogen. So, MAP crystal is formed. Eventually, MAP can be reused in short time.