关键词: 复合絮凝剂, 落叶松栲胶, 高有机物含量废水, 可过滤态COD_Cr, 废水处理

Abstract: Forty mL 37% formaldehyde solution and 80 mL 33% dimethylamine water solution reacted at room temperature for 1.5 h and pre-reaction solution was then attained.Fifty-four point seven gram of larch tannin extract and 100 mL of the pre-reaction solution reacted at 60℃ for 2.5 h,and the mixture was then rapidly cooled to room temperature.Ammonium chloride and hydrochloric acid were added to adjust the pH value of the mixture to 4.5-5.0,followed by reacting at room temperature for 1.0 h.The product(cationic tannin,CAT) reacted with aluminum polychloride(PAC) at certain temperature for certain time and a complex flocculant was then attained.The optimal operating conditions were obtained as follows:CAT:PAC 1:4(mass ratio),reaction temperature 30℃ and reaction time 1 h.The flocculant was used in high-organic-substance-content waste water treatment at room temperature at an amount of 100 mg/L.The removals of filterable COD_Cr colour and turbidity were over 60%,70% and 80%,respectively.

Key words: complex flocculant, larch tannin extract, high-organic-substance-content waste water, filterable COD_Cr, waste water treatment