Study on the effect of supergravity field synergistic flocculation on the turbidity and COD of acrylic fiber wastewater
Acrylic wastewater is characterised by a high concentration of suspended particles,high turbidi-ty and chemical oxygen demand.The separation efficiency of traditional flocculation and sedimentation methods is low in such cases.In order to treat acrylic wastewater,a method of synergistic flocculation with a supergravity field was employed.The effects of centrifugation time,rotational speed and flocculant addi-tion on the turbidity and COD removal of acrylic wastewater were then investigated.The single-factor study revealed that the turbidity removal rate increased with the increase of flocculant concentration,centrifuga-tion time and rotational speed,the COD removal rate peaked after the increase.Specifically,as the con-centration of the flocculant was increased,the ability to remove turbidity improved,indicating that higher doses of flocculant enhance the aggregation of suspended particles,facilitating their separation.Similarly,extending the centrifugation time allowed more particles to settle out under the influence of centrifugal force,thereby improving turbidity removal.Additionally,increasing the rotational speed generated greater centrifugal force,further enhancing the efficiency of particle separation.The multifactorial response surface study demonstrated that the turbidity removal rate was influenced by flocculant concentration,followed by rotational speed and centrifugation time.The COD removal rate was influenced by rotational speed,fol-lowed by flocculant concentration and centrifugation time to a lesser extent.The optimal process conditions were identified as a flocculant concentration of 0.27%,a centrifugation time of 4.5 min,and a rotational speed of 5 000 r/min,which resulted in the maximum removal rate of 91.52%for turbidity and 53.83%for COD.
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