Optimization of the Response Surface of the Wastewater Treatment Technology for Low-temperature and High-turbidity Tunnel Construction
In view of the problem that the effluent of low temperature and high turbidity tunnel construction wastewater still contains high concentration of suspended matter,which cannot meet the current discharge standards,the compound high efficiency coagulant(P29-PAFC)is used to study the coagulation effect.One-factor experiments were designed to study the effect of P29-PAFC dosage,polyacrylamide(PAM)dosage and precipitation time on the removal effect of suspended matter.According to the experimental design principle of Box-Behnken Design(BBD)of response surface method,the influence of P29-PAFC dosage,PAM dosage and precipitation time on coagulation effect were explored,and the process parameters were optimized.The experimental results show that the order of each factor on the coagulation effect is P29-PAFC infusion＞PAM dosage＞precipitation time;in P29-PAFC infusion is 35.99 mg/L,PAM dosage is 2.69 mg/L,the best precipitation time is 12.45 min,the suspension removal rate is 96.47%,basically consistent with the predicted value(95.73%)and the relative deviation is+0.74%.It can be seen that the prediction of BBD optimization model is basically consistent with the actual treatment effect,and P29-PAFC addition and PAM addition are the main control factors for the removal of suspended matter.The experimental method used in this study has the advantages of simple treatment process,stable effect,low cost and high treatment efficiency,which can provide a reference for the treatment of actual tunnel construction wastewater.
low temperature and high turbiditytunnel construction wastewatersuspended mattercoagulationresponse surface method
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