摘要
对传统混凝法处理低温高浊隧道施工废水出水中仍含有高浓度悬浮物,无法满足现行排放标准的问题,采用复配高效混凝剂(P29-PAFC)进行混凝效果研究。设计单因素实验,研究了P29-PAFC投加量、助凝剂聚丙烯酰胺(PAM)投加量和沉淀时间等因素对悬浮物去除效果的影响。依据响应面法的Box-Behnken Design(BBD)实验设计原理,探究P29-PAFC投加量、PAM投加量、沉淀时间对混凝效果的影响,并优化工艺参数。实验结果表明:各因素对混凝效果的影响顺序为P29-PAFC投加量>PAM投加量>沉淀时间;在P29-PAFC投加量为35.99 mg/L,PAM投加量为2.69 mg/L,沉淀时间为12.45 min的最佳条件下,悬浮物去除率为96.47%,与预测值(95.73%)基本吻合且相对偏差为+0.74%。由此可以看出,BBD优化模型预测与实际处理效果基本一致,P29-PAFC投加量和PAM投加量是去除悬浮物的主要控制因素。本研究使用的实验方法具有处理工艺简单、效果稳定、成本低、处理效率高等优点,可为实际隧道施工废水的处理提供参考。
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.
作者
蔺宏铭
Lin Hongming(Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《广东化工》
CAS
2024年第23期35-38,共4页
Guangdong Chemical Industry
基金
国家重点研发计划(2020YFD1100501)
甘肃省自然科学基金(20JR5RA413)。
关键词
低温高浊
隧道施工废水
悬浮物
混凝
响应面法
low temperature and high turbidity
tunnel construction wastewater
suspended matter
coagulation
response surface method
