果园种植面源污染电混凝去除的关键设计及PAM强化  

Key Designs and PAM Enhancement of Electrocoagulation Removal of Non-point Source Pollution in Orchard Planting

作　　者：李婷[1] 孙辉 孔庆刚[1] 左晓俊 王涛 李阳 LI Ting;SUN Hui;KONG Qinggang;ZUO Xiaojun;WANG Tao;LI Yang

机构地区：[1]南京信息工程大学化学与材料学院,江苏南京210044 [2]南京信息工程大学环境科学与工程学院,江苏南京210044 [3]无锡学院环境工程学院,江苏无锡214105

出　　处：《城市道桥与防洪》2023年第3期240-244,252,M0022,M0023,共8页Urban Roads Bridges & Flood Control

摘　　要：针对果园种植面源污染电混凝去除尚不明确的问题,以果园种植面源常规污染物为研究对象,考察电混凝关键设计,分析pH和电导率的影响,并探讨聚丙烯酰胺(PAM)的强化条件。结果表明:电压为10 V(2.5 mA/cm^(2)),电极间距为1 cm时,电混凝处理性能达到最佳,其中总悬浮颗粒物(TSS)、硝氮(NO3--N)、氨氮(NH3-N)、总氮(TN)和总磷(TP)的去除率分别为70.6%、30.4%、78.4%、23.7%和92.1%;酸性(pH=5)和碱性(pH=9)条件均不利于这些污染物去除;电导率的增大有利于NH3-N去除,但不利于其它污染物去除;当PAM投加量为0.5 mg/L、沉淀时间为5 min时,其强化效果最明显,对TSS、NH3-N和TP去除均有强化,去除率增幅分别为39.1%、10.3%和7.5%,但对NO3--N和TN去除有一定的抑制。该研究结果可为电混凝预处理果园种植面源污染提供理论和数据参考。Aiming at the unclear problem of electrocoagulation removal of non-point source pollution in orchard planting,taking the conventional non-point source pollutants in orchard planting as the research object,the key designs of electrocoagulation are investigated,the effects of pH and conductivity are analyzed,and the enhancement conditions of polyacrylamide(PAM)are discussed.The results show that the performance of electrocoagulation treatment is optimal when the voltage is 10 V(2.5 mA/cm^(2))and the electrode spacing is 1 cm.The removal rates of total suspended solids(TSS),nitrate nitrogen(NO3--N),ammonia nitrogen(NH3-N),total nitrogen(TN)and total phosphorus(TP)are 70.6%,30.4%,78.4%,23.7%and 92.1%respectively.Acidity(pH=5)and alkaline(pH=9)conditions are not conducive to the removal of these pollutants.The increase of conductivity is beneficial to remove NH3-N,but not to remove the other pollutants.When the dosage of PAM is 0.5 mg/L and the settling time is 5 min,the enhancement effect is the best for the removal of TSS,NH3-N and TP,and the increasing range of removal is 39.1%,10.3%and 7.5%respectively.However,it will inhibit the removal of NO3--N and TN to some extent.The research results can provide the theoretical and data reference for the electrocoagulation pretreatment of non-point source pollution in orchard planting.

关 键 词：果园种植面源 总悬浮颗粒物 氮磷 电混凝 聚丙烯酰胺 

分 类 号：S66[农业科学—果树学]