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江苏某造纸厂地处太湖流域，采用废纸为原料，年产5万t牛皮箱纸和高强度瓦楞原纸。日排废水1.2万t。原废水ph为5.5～7，codcr为1000～2000mg／l，ss为1000～1700 mg／l。原废水处理工艺为初沉法，废水经一套格栅→斜筛→平流式沉淀池处理后外排至京杭运河。由于该工艺只是去除了大量的ss和部分codcr，达不到gb3544—92《造纸工业水污染物排放标准》中二级标准。对此，采用高效浅层气浮工艺，较好地解决了这一问题。

 

1 处理工艺

 

1.1 原处理工艺存在的问题

 

该厂以废纸为原料，废水中杂质多，组分较复杂。据监测，该厂废水中可溶性codcr值为350～450mg／l，用单一初沉池难以去除。针对上述问题，