神经节苷脂生产废水处理技术研究

针对神经节苷脂生产废水蛋白质含量高的特点，研究了等电点沉淀或混凝沉降预处理、厌氧好氧生物处理、化学沉淀和类Fenton氧化后处理组合工艺处理神经节苷脂生产废水的技术。结果表明，神经节苷脂生产废水的等电点在pH=2.2左右，通过等电点沉淀可去除30%以上的COD，但等电点时蛋白质的沉淀速度非常慢；用聚合硫酸铁对神经节苷脂生产废水进行混凝预处理的最适工艺条件是：pH=7～7.5，聚合硫酸铁用量＝500～750 mg/L。在优化条件下，混凝预处理可以使神经节苷脂生产废水的COD从27 000 mg/L左右降到13 000 mg/L左右。混凝预处理后的神经节苷脂生产废水经48 h厌氧和84 h好氧生物处理，COD值进一步下降到600 mg/L左右。然后向每升生化出水中加入2～3 mmol Fe³⁺,通过化学沉淀作用除去其中的磷酸盐，过量的Fe³⁺作为后续类Fenton氧化的催化剂。当H₂O₂(30％)用量为2～3 mL/L时，最终出水的COD值可以达到国家一级排放标准。

Research of ganglioside extraction wastewater treatment process

Based on the characteristics of ganglioside extraction wastewater containing a lot of protein and high concentration COD,a sequential isoelectric point or coagulation precipitation,anaerobic-aerobic biological,chemical precipitation,and Fenton-like oxidation process has been developed to treat the wastewater in this study.The results showed that the isoelectric point of the wastewater was around pH=2.2 and the COD removal efficiency was over 30% after isoelectric point precipitation,but the protein settling velocity was very slow at isoelectric point.The optimal conditions as poly-ferric sulfate(PFS) used for the wastewater coagulation were pH=7~7.5 and PFS dose=500~750 mg/L,respectively.Under optimal coagulation conditions,the wastewater COD value was decreased from about 27 000 mg/L to about 13 000 mg/L through coagulation.The effluent of coagulation unit was treated by anaerobic(HRT=48 h) and aerobic(HRT=84 h) biological processes,and which COD value was decreased to about 600 mg/L after biological treatment.Since the PO3-4-P concentration in the biological system effluent was about 24 mg/L,2~3 mmol Fe3 /L was added to remove phosphate through precipitation and over dosed Fe3 could be worked as the catalyst of Fenton-like oxidation in the next step.The final effluent COD level could reach the Integrated Wastewater Discharge Standard of China as the H2O2(30%) dose was between 2 and 3 mL/L in the Fenton-like oxidation process.