缺氧/好氧和协同控制DO/HRT工艺对亚硝化的影响比较

为比较协同控制DO/HRT和缺氧/好氧两种运行方式对亚硝化的影响,在常温(18~22℃)下,采用两组2级连续搅拌反应器(CSTR),1#采取协同控制DO/HRT的启动和运行方式,2#采取缺氧/好氧的方式,分别比较两种方式在亚硝化的启动时间、稳定运行效果、曝气能耗、对进水NH4+-N质量浓度下降的适应性以及污泥沉降性能上的差异.结果表明:1#、2#分别用了26和41 d实现了亚硝化;在以原水经AO除磷出水为进水时(NH4+-N质量浓度35~43 mg/L),两种运行方式亚硝化效果均较好,但缺氧/好氧的运行方式节省了约20%的曝气能耗.当进水NH4+-N质量浓度由43 mg/L下降到27 mg/L时,1#亚硝化失稳,最终亚硝化率下降到67.39%,而2#亚硝化较稳定,亚硝化率保持在88%以上;1#和2#在整个过程中污泥沉降性能良好.利用协同控制DO/HRT的方式启动亚硝化,随后转变为缺氧/好氧运行,有助于亚硝化的快速启动和稳定运行,并能节省曝气能耗.     

缺氧-好氧-膜生物反应器处理人粪尿工艺研究

研究采用处理规模为4L/d的缺氧-好氧-膜生物反应器组合工艺处理人粪尿。试验运行稳定,技术可行,在硝化段水力停留时间为90d,DO的质量浓度为1.8～3.0mg/L,pH值为7.5～8.0;反硝化段DO的质量浓度不大于0.4mg/L,pH值为7.0～7.5的条件下,对CODCr,氨氮,总无机氮的平均去除率分别保持在97%,98%和97%以上,明显高于二级生化工艺。同时利用稳态数据与动力学方程,对,YKd,vmax,KS4个动力学参数进行了求解。     

A/O工艺硝化效果连续生产性恢复的研究

通过对A/O工艺生化系统受到进水冲击后,连续运行硝化效果恢复的研究,对A/O生化系统四套并联装置控制参数进行了测试,提出了恢复生化系统硝化作用的条件和降解有机物、氨氮的主要影响因素,以及最佳硝化效果操作参数的控制范围.对污水处理厂A/O工艺生化系统硝化效果稳定运行具有一定指导意义.     

Kinetics model of aerobic phase in hybrid anoxic-oxic process

Kinetics models of COD degradation,biomass growth of the anoxic-oxic ( A/O) system as well as NH3-N degradation in aerobic phase were presented according to the mass balance theory,reaction-diffusion theory and Fick law. Then these models were testified by comparson with experimental results. It is demonstrated that the variation trends of theoretical and experimental values for COD degradation and biomass growth are similar. The deviation rate between theoretical and experimental values is always under 20% even it increases along with the fluctuation of influent organic loading. In terms of NH3-N degradation,nitrification can also be well simulated by the model as the substrates of influent are sufficient. It indicates that the model can accurately reflect the reaction in hybrid A/O process. Models presented herein provide a theoretical basis for the design, operation and control of hybrid A/O process.     

A/O摇动床石化废水生物脱氮

摇动床反应器是由日本NET株式会社研发的一种新型的附着生长污水处理工艺,本文将A/O法应用到摇动床反应器中,研究了A/O摇动床对石化废水的生物脱氮效果,考察了硝化液回流比和进水负荷对脱氮效果的影响.实验结果表明,A/O摇动床对石化废水具有较好的脱氮效果,在进水COD浓度、NH⁺₄-N浓度、硝化液回流比和水力停留时间分别为400～600 mg•L^-1、20～40 mg•L^-1、2.5和26.1 h时,出水COD、NH⁺₄-N和TN浓度小于40 mg•L^-1、1.0 mg•L^-1、7.0 mg•L^-1,COD去除率、硝化率和反硝化率分别达到90%、95%和70%.