Research on the Pretreattment of Amino Containing Wastewater
SHENG Yi-ling1,WANG Fang-yuan
(1. Biological Engineering Department, Jinhua College of Profession and Technology, Jinhua 321007, China;
2.Zhejiang huanqiu produce Paint Co. LTD, Jinhua 321000, China)

　　Abstract: Coating adhesive production generates amino wastewater with an average of 2.27×105mg/L C0Dcr.The main components and contents of the water are: formaldehyde=3%～5% (w/w), methanol =7%～10% (w/w) and butanol=6%～10% (w/w). Settling, extraction, formaldehyde removal by urea adding and dealcholizing by distillation were adopted for the Pretreatment, Tests show that direct dealcholizing by distillation recovered 5%～7% alcohol with more than 80% removal of COD_Cr on the alkaline conditions.
　　Key words: amino wastewater; wastewater treatment; chemical precipitation; distillation

前言

　　氨基废水是涂料行业废水的给水排水英语论文主要污染源之一，COD_Cr浓度高达20×10⁴～35×10⁴mg／L，如采用室外自然加热挥发，会引起二次污染（空气污染）。若直接处理COD_Cr负荷冲击大，影响后续生化处理。针对氨基废水有机物浓度高、易挥发、沸点差异大等特点，我们进行了几种不同处理方法的给水排水英语论文试验研究。以下着重介绍苹取、化学反应沉淀、酸性或碱性条件下蒸馏、多级精馏等试验结果。

1 废水的主要成份

　　氨基废水大部分来自甲醛原料和反应生成水，COD_Cr平均浓度为22.7×10⁴mg／L，每天排放水量约占投料量的40％左右，氨基废水主要成份：甲醛3％～5％，甲醇7％～10％，丁醇6％～10％，还有小部分水溶性氨基树脂，脲醛树脂及未反应完全的三聚氰胺、尿素等。^[1]

2 试验方法与结果分析

　　氨基废水处理试验原水样COD_Cr为22.7×10⁴mg／L。每次试验取废水量为1000mL，按如下方法进行试验。
2.1 静置分离
　　氨基废水中含有部分氨基树脂，在预处理前用静置分离法进行回收，试验结果见表1。