A pulp and paper wastewater treatment process

Abstract

The invention discloses a pulp paper wastewater treatment process which comprises the following steps: wastewater produced by pulping and papermaking productive process is fed into a water-collecting well, the collected wastewater successively passes through a primary sedimentation tank, an adjusting tank, a cooling tower, a selection tank and a jet-flow aeration tank, the wastewater after aeration is then fed into a secondary sedimentation tank to successively passes through a fenton reactor, an oxidation pond, a mixing tank and a highly efficient coagulative mechanical clarifier to be treated, and is then finally discharged after reaching the discharge standard. According to the pulp paper wastewater treatment process, provided by the invention, the process route is clear, definite, continuous and compact, so that the pulp paper wastewater treatment process is suitable for large-scale usage of effluent treatment plants of pulp and paper enterprises, and has the advantages of high working efficiency and good treatment effect, the daily treatment capacity can reach 80000-86000 m<3>, the CODCr removal rate can reach 75%-80%, the BOD is lower than 300 mg / L, the TSS value is lower than 20 mg / L, the pH value of water after treatment is 6.0-7.0, and the chromaticity is reduced by 80%.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a process for treating pulp and paper waste water. Background technique [0002] The paper industry is one of the key industries in many cities, but it has always had the problems of large water consumption and large sewage discharge, and is widely regarded as a key polluting industry. And with the continuous expansion of the scale of paper enterprises, the daily production of wastewater is extremely large. At the same time, the introduction of the national standard "Discharge Standards for Water Pollutants in the Pulp and Paper Industry" GB3544-2008 has further stringent wastewater discharge standards. At present, most pulp and paper wastewater treatment There are problems of complex process, insufficient processing capacity and substandard drainage quality. Contents of the invention [0003] The purpose of the present invention is to overcome the above deficien...

AI Technical Summary

Problems solved by technology

And with the continuous expansion of the scale of paper enterprises, the daily production of wastewater is extremely large. At the same time, the introduction of the national standard "Discharge Standards for Water Pollutants in the Pulp and Paper Industry" GB3544-2008 has further stringent wastewater discharge standards. At present, most pulp and paper wastewater treatment There are problems of complicated process, insufficient treatment capacity and substandard drainage quality

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