聚合氯化铝和聚丙烯酰胺复合絮凝剂处理造纸废水

研究了用聚合氯化铝和聚丙烯酰胺复合絮凝剂处理造纸废水，考察了酸度、混凝剂加人量、搅拌速度、搅拌时间、沉降时间对CODCr去除率的影响。实验结果表明：调节废液pH值在3-4之间，能够沉降废液中大部分悬浮物质，使废液CODCr明显降低；在搅拌速度为300r／min时，上层清液（废液调回至碱性）中加入PAC质量浓度300mg／L和PAM质量浓度15mg／L，可以将废液的CODCr值降到400mg／L左右。对絮凝后的废液用次氯酸钙进一步氧化处理，废液的CODCr值降到国家规定的造纸工业污水排放标准（150mg／L）。

Treatment of paper making wastewater with polyaluminum chloride- polyacrylamide composite flocculant

The samples of wastewater froma paper mill treated with composite flocculant of PAC and PAMhave been studied.The whole experiment process contains the following three steps:separating out xylogen on acidic condition;flocculating on alkaline condition;oxidizing flocculated water.The results showmost suspended substances in the wastewater could be eliminated and the CODCr of the wastewater decreases obviously when the pH is adjusted to 3-4;the CODCr of the wastewater could be lowered to about 400 mg/Lby adding 300 mg/LPAC and 15 mg/L PAMto 1 L wastewater under stirring (300 r/min);after oxidizing flocculated wastewater with Ca(ClO)2,the CODCr of the wastewater is lowered to 150 mg/L (discharge standard of water pollutants for paper industry).