水力条件对芦苇湿地系统DO质量浓度的影响

就水位及水力负荷对湿地系统中DO质量浓度的影响进行实验。结果表明：随着水位的不断提高,芦苇湿地系统中的DO质量浓度呈现出不断升高的趋势,且在300～550 mm水位区间增加趋势比较明显,随着水位的再度升高,在550～650 mm水位区间DO质量浓度增加趋势趋于平稳;随着水力负荷的不断增加,芦苇湿地系统中的DO质量浓度呈现先增加后减小的趋势,本实验中最适合的水力负荷在0.8968～1.2230 m3/（ m2＆#183; d）之间。     

CIBR 脱氮试验研究

试验研究了CIBR在曝气3 h、搅拌2 h、静沉1 h的周期循环条件下的脱氮效果,考察了氮的时间形态转化和空间浓度分布,以及整个周期内DO和pH的变化规律.试验结果显示,反应器的CODCr、NH3-N及TN出水平均浓度分别为23.64 mg/L、4.21 mg/L和12.73 mg/L,稳定地达到了<城镇污水处理厂污染物排放标准(GB 18918-2002)的一级A标准.D0与pH的变化规律一致,均可以在一定程度上指示微生物适应阶段、COD降解阶段和硝化反应阶段,而区别仅在于pH比DO稍稍滞后.     

有机碳源和DO对短程硝化的影响

在SBR反应器中控制温度为(30±1)℃,pH为7.5～8.5,DO质量浓度为0.6～1.8mg·L-1,MLSS质量浓度稳定在5 000 mg·L-1左右,实现了短程硝化反硝化,并在C/N为1/1、1/2、1/4和DO质量浓度为0.3～O.4、0.4～0.6、0.6～1.6、1.6～2.0 mg·L-1的情况下,对亚硝酸氮累积的效果进行对比试验.结果表明,氨氮的去除率随着C/N的增加而降低,C/N=1/4时氨氮去除率达到98.3%,亚硝态氮的累积率达到了99.95%,DO质量浓度为0.6～1.6mg·L-1时最适合于同步硝化好氧反硝化脱氮.出水氨氮质量浓度为0.57mg·L-1,亚硝态盐氮质量浓度为125.78mg·L-1,硝酸盐氮质量浓度为O.26mg·L-1.     

生物陶粒MBBR同步硝化反硝化脱氮试验研究

利用生物陶粒作为移动床生物膜反应器(MBBR)的填料,通过试验考察了MBBR发生同步硝化反硝化(SND)的可能性。分析了溶解氧和碳氮质量比对SND的影响。试验结果表明:MBBR具有良好的有机物去除及同步硝化反硝化能力。溶解氧的质量浓度在3 mg/L左右时,不仅能够满足硝化作用的需要而且又不严重抑制反硝化作用,NH3-N去除率达到81.45%的同时TN去除率为60.35%;进水碳氮质量比在10左右时,NH3-N、TN去除率分别为81.65%、63.60%。     

季节ARIMA模型在于桥水库溶解氧预测中的应用

目前水库污染问题严重,而溶解氧是表征水体受污染程度和生态环境好坏的重要指标。介绍了ARIMA模型,以于桥水库三个监测站点1999～2005年的溶解氧含量为基础,运用季节ARIMA模型进行分析,预测2006年各监测站点的溶解氧含量,经与实际数据验证,说明该方法对于桥水库溶解氧浓度预测效果较好。     

亚硝酸型硝化反应器处理"中老龄"垃圾渗滤液研究

在不控制体系pH值的条件下,研究了温度、水力停留时间和溶解氧对亚硝酸型硝化反应器处理"中老龄"垃圾渗滤液的影响.试验结果表明,在氨氮负荷率为0.069 0～0.284 3gNH4+-N/(gVSS·d)的条件下,可获得令人满意的亚硝化性能,出水NO2--N/NOx--N值为87%～95%.亚硝酸氮稳定积累的主导因素是体系中游离氨(FA)和游离亚硝酸(FNA)对硝酸菌的交替抑制作用.     

多功能校准仪的常见故障维修和校检

通过对部分型号的多功能校检仪的工作原理和其内部校准用中值电阻功能的仔细分析，总结出对多功能校检仪在使用中所出现的共性故障的维修方法和对它们各自所具有的自身特点的精度调整的方法。     

Effect of ZnO doping on morphology and electrochemical properties of sub-micron RuO2 sensing electrode of DO sensor

Thick-film 20 mol% ZnO-doped RuO₂ sensing electrodes (SEs) were fabricated by screen-printing technique on the platinised alumina substrate of the planar electrochemical dissolved oxygen (DO) sensor. The effect of ZnO doping on morphology, electrochemical properties and sensing characteristics of the sensor was investigated. It was found that ZnO doping has not only improved the SE structure, but has also enhanced selectivity of the DO sensor. Selectivity testing exhibited that the presence of Cl⁻, Li⁺, SO₄²⁻, NO³⁻, Ca²⁺, PO₄³⁻, Mg²⁺, Na⁺ and K⁺ with a concentration range of 10⁻⁷ to 10⁻¹ mol/L in the solution had practically no effect on the sensor's emf. The reason in enhancement of the sensor characteristics could be related to the establishment of the better structured SE as more advanced crystallization is achieved for the doped RuO₂-SE.     

DO对A/O同步脱氮除磷工艺的影响研究

采用A/O同步脱氮除磷工艺处理模拟城市污水,考察了好氧段DO浓度对该工艺处理效果的影响.结果表明,好氧段DO浓度对系统脱氮除磷效果的影响显著,当DO控制在1.5mg/L左右时,系统的处理效果最佳,可实现同步硝化反硝化和反硝化除磷,对NH4+-N、TN、TP、COD的去除率分别为99.12%、94.61%、92.85%、96.10%,平均出水NH4+-N、TN、TP、COD分别为0.25、0.68、0.5和10 mg/L.     

The characteristics of microbial ecosystem response with the changes of hydrolic retention time on an aerobic fixed-biofilm biological nutrient removal system

The influence of an aerobic fixed-biofilm activity, microbial ecosystem and mass transfer with respect to HRT variation in a BNR (biological nutrient removal) system has been investigated in this study. The process used in this study was an anoxic (1)/aerobic (1)/anoxic (2)/aerobic (2) system. The study was demonstrated by several kinds of techniques such as INT-dehydrogenase activity (DHA), INT (2-(p-iodophenyl)-3-(p-nitrophenyl)-5-phenyl tetra-zolium chloride), DAPI (4’,6’-diamidino-2-phenylindole hydrochloride), and microelectrode. The study used by synthetic wastewater and HRT variation demonstrated that the DHA activity, density and heterotrophs/autotrophs ratio increased, as the HRT decreased from 8 hr to 4 hr. In comparing two aerobic reactors in fixed-biofilm process, the first aerobic reactor of the higher C/N ratio showed higher heterotrophs/autotrophs ratio and microbial activity than the second aerobic reactor. It was therefore concluded that the heterotrophs/autotrophs ratio and microbial activity were a greater influence on the first aerobic reactor, as organic loading rate was increased by HRT variation.