应用PFS-EM组合工艺处理藻型富营养化源水的研究

【作者】 项东玲；

【导师】 王平；

【作者基本信息】 中南林学院 ， 环境科学， 2003， 硕士

【摘要】 本文将新型无机高分子混凝剂聚合硫酸铁（PFS）与具有“头领效应”的有效微生物群（EM）有机结合，利用二者去除水体污染物的互补性形成组合工艺，对藻型富营养化源水进行处理。通过对PFS最佳作用条件的筛选，考察不同作用条件下对EM处理藻型富营养化源水处理效果的影响，从而确定出一种较为理想的处理工艺组合，并进行较长期的稳定初试运行。实验结果表明： （1）PFS处理阶段，当PFS投加量为30mg/L，先以105r/min转速快速搅拌1分钟，然后以50r/min转速慢速搅拌15分钟，静置20分钟，此时源水中T-P和COD_cr去除率分别达到77.5％和74.66％。 （2）在EM处理阶段，当V_EM/V_污水为5/10000，曝气时间为HRT/2（HRT=5天），水温25℃，pH值中性时，EM可表现出较好的除（抑）藻效果，此时污水中叶绿素a的去除率可达90％。实验结果表明，本阶段曝气时间过长将降低对污水T-P和叶绿素a的去除率。同时，当EM投加量过大(V_EM/V_污水大于1/1000)时，COD_cr的去除将表现出表观无效性，这可能是由于EM自身的COD_cr浓度较高的缘故。 （3）组合工艺在最佳工作条件下，即PFS为30mg/L，V_EM/V_污水为5/10000，曝气时间为HRT/2（HRT=5天），水温为25℃，pH值为中性时，源水中叶绿素a、T-P、COD_cr、T-N的去除率分别可达93％、89％、85％、60％。明显高于PFS单元工艺和EM单元工艺的处理效果。处理出水主要指标基本达到或接近国家地表Ⅲ类水质标准。 本文首次尝试将成熟的混凝沉淀技术与具应用前景的EM技术有效组合，形成组合处理工艺，利用二者可处理不同污染物的特点，有效处理了富营养化源水，研究方法与初步结论对同类研究具有一定的参考价值。更多还原

【Abstract】 This study integrates inorganic PFS and effective EM into a compound technology. It takes advantage of mutual effect to removal pollutant from algal eutrophic water. Through selecting the optimal operational conditions of PFS and investigating treatment effect of EM with different condition, then a relative perfect compound process confirmed, and operate it with a relative long period. Experimental results demonstrate as below:(1) PFS process stage: With these operational conditions: dosage of PFS 30mg/L, the mixing speed 105r/min at the first minute, then slow the speed with 50r/min for 15 minutes, and finally placed it for 20 minutes, the T-P and CODcr removal efficiency in effluent appear at 77.5% and 74.66 respectively.(2) EM process stage: When the eutrophic water is used as influent at temperature 25 癈, HRT/2, neutral pH value and EM casting proportion(VEM/Vsewage) 5/10000, EM has good effect on removing algae, and the Chl-a removal efficiency in effluent is up to 90%. This experiment also shows that if aeration time is too long, the T-P and Chl-a removal efficiency in effluent will decrease. At the same time, when dosage of EM is too much, for example more than 1/1000 of ratio of EM to waste water, then EM is useless to removal CODcr. The possible reason is EM itself has high CODcr.(3)Assembled process stage:The optimal conditions of assembled process: PFS 30mg/L, EM casting proportion(VEM/Vsewage) 5/10000, aeration time two HRT/2, water temperature 25 癈, neutral pH value, the Chl-a, T-P, CODcr, TN removal efficiency in effluent is 93%, 89%, 85%, 60% respectively. These removal rates are higher than PFS or EM process individual apparently. The effluent water meets or near to national III class surface water standard.The study attempts to integrate mature flocculation precipitation process with a prospect technology of EM into assembled process. Due to PFS and EM can dispose different pollutant, this assembled process takes advantage of mutual effect to treat eutorphic water, it can get sound results. The research methods and relative elementary results will promote the progress of the same research.更多还原