Papermaking waste liquor ecologic treatment and recovery circulation use
A technology for papermaking wastewater and ecological treatment, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Operation, papermaking wastewater treatment effect is not ideal, etc.
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[0012] The specific implementation of the present invention is illustrated by the following examples.
[0013] A paper mill in Jiangsu has an annual output of 18,000 tons of machine-made paper, and its technology adopts the traditional domestic straw pulp production process. After papermaking black liquor is recovered and treated by alkali in the factory, the comprehensive wastewater concentration COD Cr =2600~2800mg / L, SS=450~480mg / L, pH=9~10, the daily discharge of wastewater is 15,000 tons.
[0014] Papermaking wastewater is first discharged into the sedimentation tank for primary sedimentation, and livestock manure is added to adjust the BOD 5 / COD Cr To 0.45, the effluent is lifted into the stabilization pond system through the pumping station. The stable pond consists of four ponds: anaerobic pond I, anaerobic pond II, facultative pond I, and facultative pond II. Anaerobic pond I is connected in series with facultative pond I, and anaerobic pond II is connected in ser...
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