微生物酸化技术应用于碱法草浆黑液酸析木素的试验研究

The test and research of application of microbial acidizing technology used in lignin acidizing separation to treat alkaline wheat straw pulping wastewater

碱法草浆黑液碱性大、木素含量高、成分复杂,极难处理,利用微生物酸化技术将黑液预酸化,在不添加任何营养的条件下,不仅可使pH值下降至中性,而且CODcr、木素含量均有所下降,再经酸析木素比直接酸析木素节约用酸40%左右,极大的降低了处理成本,提高了处理效率。

Wheat straw pulping wastewater has high alkalinity, lignin and contents with complicate composition which is difficult to treat. The microbial acidizing technology is used to preacidize the wastewater on condition of no additional nutrition which can reduce not only the pH value to neutral level but also the COD\-\{cr\} and lignin content. The acid amount used in preacidizing lignin separation process can be saved about 40%, which greatly reduce the treatment cost and improve the treatment efficiency.