Mid-stage effluent of ammonium sulfite method is different from other industrial waste-water because of its abundant nutrients and less toxicity.

• 亚铵法制浆中段水含有大量的营养物质,且基本不含有毒有害物质从而区别于其它工业污水,如直接排放不仅污染环境而且造成资源的浪费。