Notice of RetractionStudy of CPAM/ bentonite microparticle retention system on reducing pollution load of papermaking white water

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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In order to investigate the effects of CPAM/bentonite microparticle retention system on reducing pollution load of papermaking white water, the dynamic drainage jar was used to simulate the wet end of low grammage fresh-keeping case board production. The turbidity and CODcr of the filtrate were measured to express the pollution load of white water. Results showed that the turbidity and CODcr of white water in CPAM/bentonite microparticle retention system were similar to that in CPAM monocomponent system when CPAM dosage was less than 0.02%, and that the CPAM/bentonite microparticle retention system had no significant retention effects unless the dosage of CPAM was larger than 0.02%. The turbidity and CODcr of white water in CPAM/bentonite microparticle retention system reached the minimum value when the dosage of CPAM and bentonite were 0.04% and 0.2%, respectively. The stir speed should be controlled below 750 rpm in the case of CPAM and bentonite were added into pulp suspension, otherwise, the formed flocs could be destroyed, which resulting in higher turbidity and CODcr of white water.