Abstract: The sources of ammonia nitrogen and chemical oxygen demand (COD) in wastewater from zeolite synthesis process were analyzed, and the solutions to reduce the discharge of ammonia nitrogen and COD were determined. The preparation process of ZSM-5 was optimized, and the reuse procedure of mother liquor and amine-water mixture was adopted. The mother liquor concentration device was built to apply primary mother liquor and secondary mother liquor from titanium silicalite molecular sieve synthesis process for the synthesis of ZSM-5 zeolite to realize the cascade utilization of waste mother liquors. The preparation of ZSM-5 zeolite using mother liquor from ? zeolite synthesis was also carried out. These results showed that the reuse procedure of mother liquor not only solves the environmental pollution caused by the discharge of waste liquid from the production of zeolite, but also reduces the production cost of ZSM-5 zeolite.

Key words: ZSM-5 zeolite, mother liquor, COD, greenization