阳离子单宁-聚铝复合絮凝剂处理高有机物含量废水的研究

TREATMENT OF WASTE WATER OF HIGH-ORGANIC-SUBSTANCE- CONTENT BY CATIONIC TANNIN-POLYCHLORIDE COMPLEX COAGULANT

37%甲醛溶液40mL,33%二甲胺水溶液80mL,室温下反应1.5h得预反应液。落叶松栲胶54.7g,60℃下与预反应液100mL反应2.5h,骤冷至室温,用氯化铵和盐酸的混合溶液调反应液pH值至4.5～5.0,继续反应1h。所得产物(CAT)与聚合氯化铝(PAC)混合反应得到复合絮凝剂,最佳反应条件为:CAT∶PAC为1∶4(质量比),反应温度30℃,反应时间1h。所得复合絮凝剂适用于室温下处理酸性高有机物含量废水,絮凝剂投加量100mg/L。可过滤态CODCr去除率可达60%以上,色度去除率70%以上,浊度去除率80%以上。

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.