造纸工业废水的处理[3]应着重于提高循环用水率，减少用水量和废水排放量，同时也应积极探索各种可靠、经济和能够充分利用废水中有用资源的处理方法。例如浮选法可回收白水中纤维性固体物质，回收率可达95%，澄清水可回用；燃烧法可回收黑水中氢氧化纳、硫化钠、硫酸钠以及同有机物结合的其他钠盐。中和法调节废水pH值；混凝沉淀或浮选法可去除废水中悬浮固体；化学沉淀法可脱色；生物处理法可去除BOD，对牛皮纸废水较有效；湿式氧化法处理亚硫酸纸浆废水较为成功。此外，国内外也有采用反渗透、超过滤、电渗析等处理方法。

The treatment of paper industry wastewater should focus on improving the rate of circulating water, reducing water consumption and wastewater discharge. [3] should also actively explore various reliable, economic and effective ways to make full use of useful resources in wastewater. For example, floatation method can recover fibrous solid substances from white water, the recovery rate can reach 95%, and the clarified water can be reused. The combustion method can recover sodium hydroxide, sodium sulfide, sodium sulfate and other organic salts combined with organic matter in black water. Neutralization method can regulate the pH value of wastewater. Coagulating sedimentation or flotation can remove suspended solids in wastewater. Chemical precipitation can decolorization. Biological treatment can remove BOD, which is more effective for kraft paper wastewater. Wet oxidation process for sulfite pulp wastewater is more successful. In addition, the treatment methods such as reverse osmosis, ultrafiltration and electrodialysis are also used at home and abroad.