降低超稳分子筛生产污水中氨氮含量工艺研究

Study on Wastewater N-NH_3 Reduction Process in Production of Ultrastable Zeolite

通过对催化裂化催化剂活性组分──超稳分子筛的生产工艺过程铵盐消耗的分析,在小试试验的基础上,结合装置实际情况,经优化工艺条件,改进工艺流程,降低交换过程铵盐投料比,并用后工序废液代替化学水用于前工序浆液的调配等手段,使铵盐消耗量由1.8t/t降至0.95t/t,每年可节约467.5万元;同时采用氨氮回收技术将高氨氮污水中氨氮含量由原来的5000mg/L降至200mg/L以下,为最终采用生物法将污水氨氮含量降至15mg/L以下达标排放奠定了坚实基础。

Based on analysis of the consumption of ammonium salt during production of ultrastable zeolite of active constituent of catalytic cracking catalyst , bench scale testing and process unit, optimization of process and improvement of process flow, reduction of the feeding ratio of ammonium salt in process, the replacement of chemical water by later process waste liquid preparing for the first mixed liquid, the consumption of ammonium salt reduces from 1.8 t/t to 0.95 t/t, and 4.675 million Yuan can be saved each year. With technology of N-NH3 recovery, concentration of N-NH3 in high strength ammonia wastewater reduced from 5,000mg/L to below 200mg/L. Once biotechnology is used further, concentration of N-NH3 will be reduced below 15 mg/L, which builds a basis for wastewater discharge meeting national standard.