Beta分子筛催化剂催化氧化油墨污泥的试验研究

Beta Molecular Sieve Catalyst for Catalytic Oxidation of Ink Sludge

通过制备4种以Beta分子筛为载体的非均相催化剂,考察催化剂种类、催化剂投加量、氧化剂投加量、反应温度和反应时间等因素对催化氧化油墨污泥的影响,并对性能最优和性能最差的两组催化剂进行了X射线衍射(XRD)和扫描电镜(SEM)表征。同时设计了正交试验,分析上述前4种因素对非均相催化氧化油墨污泥的影响程度,并且对湿式催化氧化法处理油墨污泥的过程进行了动力学分析。最终确定非均相催化剂催化氧化油墨污泥的最佳反应条件为:每5 g油墨污泥中加入20 mL蒸馏水、以Fe-Beta为催化剂、以30%的H2O2为氧化剂、催化剂和氧化剂的投加量分别为40 mg和0.3 mL、在200℃下反应1 h,在此条件下,COD、SS和VSS的去除率分别可达到99.64%、87.56%和85.40%;同时,污泥比阻和污泥毛细吸水时间(CST)分别从最初的1.68×10^(10)s^(2)/g和93.1 s下降至3.26×10^(9)s^(2)/g和23.7 s,污泥脱水性能大大提高。

By preparing four kinds of heterogeneous catalysts supported on Beta molecular sieve,the effects of factors such as catalyst types,catalyst dosage,oxidant dosage,reaction temperature and reaction time on the catalytic oxidation of ink sludge were investigated,and the two groups of catalysts with the best and the worst performances were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).In addition,orthogonal experiment was designed to analyze the influence of the former four factors on the heterogeneous catalytic oxidation of ink sludge,and the kinetics of catalytic wet oxidation(CWO)for ink sludge treatment was investigated.The optimal reaction conditions of heterogeneous catalyst for catalytic oxidation of ink sludge were eventually determined as follows:adding 20 mL distilled water to every 5 g of ink sludge,the catalyst(Fe-Beta)and oxidant(hydrogen peroxide,30%)dosages of 40 mg and 0.3 mL.After reacting at 200℃for 1 h,the removal rates of COD,SS and VSS were 99.64%,87.56%and 85.40%,respectively.The specific resistance of the ink sludge decreased from 1.68×10^(10)s^(2)/g to 3.26×10^(9)s^(2)/g,and the capillary suction time(CST)of sludge decreased from 93.1 s to 23.7 s,indicating that the dewatering performance of sludge was greatly enhanced.