Enhanced biological nutrients removal using an integrated oxidation ditch with vertical circle from wastewater by adding an anaerobic column

Introduction Theenrichmentofnutrientsinwaterbodiesisoneofthecrucialfactorsaffectingwaterquality(Romanski,1997).Ithasbeenreportedthatdischargingwastewaterwithhighlevelsofphosphorus(P)andnitrogen(N)canresultineutrophicationofreceivingwaters,particularlylake…     

Sludge reduction with Tubificidae and the impact on the performance of the wastewater treatment process

To reduce excess sludge, a Tubificidae reactor was combined with an integrated oxidation ditch with vertical circle (IODVC), and a new integrated system was developed for wastewater treatment. A pilot-scale of this integrated system was tested to investigate the sludge reduction with Tubificidae and the impact on effluent quality and sludge production. The dominant worm was Branchnria Sowerbyi in the Tubificidae reactor after inoculation of Branchnria Sowerbyi and Limnodrilns sp., and the maximal volume density of wet Tubificidae in vessels of the Tubificidae reactor was 17600 g/m3. Two operational modes, treating the excess sludge (first mode) and the returned sludge (second mode) of IODVC by the Tubificidae reactor, were used in this experiment. The results showed that the excess sludge reduction rate was 46.4% in the first mode, and the average sludge yield of the integrated system was 6.19×10-5 kg SS/kg COD in the second mode. Though the sludge returned to IODVC via the Tubificidae reactor, it had little impact on the effluent quality and the sludge characteristics of the IODVC. No new type of recalcitrant substance in the supernatant was discharged into the environment when the sludge was treated by Tubificidae. The experimental results also indicated that no significant changes occurred on the viscosity, specific resistance, and the floc size distribution of the sludge.     

氧化沟污水处理技术的发展及在煤矿中的应用

本文概述了氧化沟污水处理技术的发展，技术特征、分类、根据煤矿生活污水的特点，论述了采用氧化沟技术处理污水的合理性，提出了适合煤矿生活污水的氧化沟工艺流程，主要的设计技术参数。     

Flow characteristic and wastewater treatment performance of a pilot-scale airlift oxidation ditch

A pilot-scale airlift oxidation ditch using bubble diffuser and baffle as aerator was operated in a wastewater treatment plant (WWTP) to investigate its flow characteristic and wastewater treatment performance. Compared with the conventional oxidation ditch process, effective depth and oxygen utilization efficiency of this new process was improved by underwater aeration. Furthermore, it had a reversed velocity distribution, which decreased from the bottom to the top on vertical section. Velocity measurement showed that a velocity over 0.2 m/s at the bottom was sufficient to prevent sludge settlement during long term operation. Application of these concepts would save land area and energy consumption by about 25%–50% and 55%, respectively. In this new system, organic biodegradation and nitrification could be well achieved. Denitrification could occur steadily in the straight part by adjusting the airflow rate. An average TN removal rate of 63% was achieved with dissolved oxygen (DO) concentrations between 0.6 mg/L and 1.5 mg/L. The main pollutants in the effluent could meet the strictest discharge standard (COD<50 mg/L, NH₄ ⁺−N < 5 mg/L, and TN < 15 mg/L) in China now.     

气升式氧化沟污水处理效果的中试研究

在太湖流域某小城镇污水处理厂研究中试气升式氧化沟的污水处理效果,获取了出水主要指标稳定达标的工艺参数.结果表明,出水COD<50mg/L的最大容积负荷为0.88kg/(m3·d).NH4+–N污泥负荷不大于0.06kg /(kg·d)时,出水能达到排放标准要求的5 mg/L.直沟段DO降低到0.6~1.0mg/L后,进出水TN平均浓度分别为30.7,11.3mg/L,并能保证出水TN<15 mg/L稳定运行14d以上.进气量30m3/h时,直段底部最大流速为0.19m/s,中上部流速为0.03m/s,此时沟底没有出现污泥沉降,出水各项指标稳定达标.生产型气升式氧化沟的占地面积将比传统氧化沟至少减少25%.     

立体循环一体化氧化沟(IODVC)导流板结构优化研究

针对立体循环一体化氧化沟(IODVC)弯道流场存在的问题,利用计算流体力学(CFD)和Fluent计算方法,对IODVC流场进行了二维单相流模拟,探究导流板结构形式对弯道流速分布的影响.研究结果表明,在同等边界条件下,导流板的结构形式对IODVC内混合液的流态分布影响较大.与单导流板相比,双导流板可将流速大于0.25 m·s-1的区域占比提高9.5%,并改善了弯道出口断面流速分布,有效地减小了下沟道靠近隔板处回流区域;此外,适当延长导流板末端长度,可以进一步强化对IODVC内混合液的导控作用,当延长长度等于导流板半径时,效果最佳,大于0.25 m·s-1的流速区域占比达到44.21%,使IODVC内部流场更加趋于均匀.研究结果对IODVC的进一步优化和工程设计有一定的指导意义.     

三沟式环形氧化沟应用前景浅探

叙述在我国石化系统污水处理过程中采用的第一套新型的三沟式环形氧化为，即融曝气与沉淀于同一构筑物内的基本布置、运行方式，并通过设计提供的资料及参数进行计算、复核其运行状况和处理效果及存在问题，结合本公司现状探讨其应用前景。     

ORBAL氧化沟处理合成制药废水

近１０年来，用氧化沟处理污水的生化工艺逐渐在国内推广运用，对于用氧化沟处理较大水量的合成制药废水，则是一种新的尝试。本文通过氧化沟处理合成制药废水实例，介绍一种高效节能的ＯＲＢＡＬ氧化沟装置。     

卡鲁塞尔氧化沟液-固两相流动混合物模型与两相水力特性模拟

采用CFD数值计算的方法研究了卡鲁塞尔氧化沟工艺的污水-污泥两相水力特性.将污泥沉降模型进行湍流影响修正后与两相湍流混合物模型耦合,建立了氧化沟液固两相湍流混合物模型,实现了垂向上液固两相运动的分离;利用计算流体软件Fluent对工业规模污水厂氯化沟的污水-污泥两相流速进行模拟,结果表明,两相流混合物模型较好地揭示了氧化沟内混合液流场和污泥的分布情况,污泥浓度与流速呈负相关.     

Evaluation on the performance of triple oxidation ditch system treating municipal wastewater

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Addition of anaerobic tanks to an oxidation ditch system to enhance removal of phosphorus from wastewater

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氧化沟中导流板的调整以增加曝气效率减少池底沉泥厚度的实践

三槽式氧化沟转刷下游导流板的设置位置和安装的倾角角度直接影响着三槽氧化沟的运行效果.设置导流板的目的是为了均匀分布氧化沟上下流速,增大沟底水流速度以减少池底积泥;促进沟内水流的上下混合强度以提高DO的转移效率.唐山东郊污水处理厂投产初期,导流板安装较乱.我们通过与唐山北郊污水处理厂的比较和分析,调整了导流板的位置,对调整前后的检测数据分析,提出了合理安装转刷下游导流板可有效的改善氧化沟流速分布、消除沟底积泥、提高转刷充氧效果,并对导流板定位尺寸提出建议,以供参考.     

氧化沟工艺处理火车站废水的运行与调试

以信阳市火车北站污水处理工程为例．介绍了以一体化氧化沟工艺为主的处理工艺及其主要构筑物如：泵井、平流沉砂池、氧化沟以及接触消毒池的结构特点和设计水力负荷条件等。针对火车站废水特有的含油污量高、可生化性差的特点．指出了其运行与调试过程中应注意的问题。     

利用脉冲澄清池补充处理生化后废水的运行结果和分析

通过对脉冲澄清池在综合废水处理中运行效果的跟踪分析,确定出利用脉冲澄清池补充处理生化后废水(悬浮物、COD_(cr)、BOD_5等)的影响程度,为其在综合废水处理工艺中的应用及其局限性,提供了必要的参考依据.     

初沉池内速度场数值模拟

采用改进的k-ε两方程模型和SIMPLEC算法,对平流式初沉池内速度场进行了数值模拟,研究发现:池内存在着一个小回流区和一个大回流区,小回流区位于进水区底部,大回流区位于入流挡板后的沉淀池上部,约占整个容积的30%~40%,是初沉池性能下降的重要原因。     

Numerical simulation of a combined oxidation ditch flow using 3D k-εturbulence model

The standard three dimensional（3D） k-ε turbulence model was applied to simulate the flow field of a small scale combined oxidation ditch. The moving mesh approach was used to model the rotor of the ditch. Comparison of the computed and the measured data is acceptable. A vertical reverse flow zone in the ditch was found, and it played a very important role in the ditch flow behavior. The flow pattern in the ditch is discussed in detail, and approaches are suggested to improve the hydrodynamic performance in the ditch.     

染整废水处理的工程实践

利用水解 -酸化二段接触氧化与微絮凝、富氧生物碳的组合工艺处理染整废水的实际工程设计思路及特点 ,为类似废水的处理提供借鉴经验     

Removal of airborne microorganisms emitted from a wastewater treatment oxidation ditch by adsorption on activated carbon

Bioaerosol emissions from wastewater and wastewater treatment processes are a significant subgroup of atmospheric aerosols. Most previous work has focused on the evaluation of their biological risks. In this study, however, the adsorption method was applied to reduce airborne microorganisms generated from a pilot scale wastewater treatment facility with oxidation ditch. Results showed adsorption on granule activated carbon (GAC) was an e cient method for the purification of airborne microorganisms. The GAC itself had a maximum adsorption capacity of 2217 CFU/g for airborne bacteria and 225 CFU/g for fungi with a flow rate of 1.50 m3/hr. Over 85% of airborne bacteria and fungi emitted from the oxidation ditch were adsorbed within 80 hr of continuous operation mode. Most of them had a particle size of 0.65–4.7 m. Those airborne microorganisms with small particle size were apt to be adsorbed. The SEM/EDAX, BET and Boehm’s titration methods were applied to analyse the physicochemical characteristics of the GAC. Relationships between GAC surface characteristics and its adsorption performance demonstrated that porous structure, large surface area, and hydrophobicity rendered GAC an e ective absorber of airborne microorganisms. Two regenerate methods, ultraviolet irradiation and high pressure vapor, were compared for the regeneration of used activated carbon. High pressure vapor was an e ective technique as it totally destroyed the microorganisms adhered to the activated carbon. Microscopic observation was also carried out to investigate original and used adsorbents.     

三沟式氧化沟污水处理工艺的性能分析

以生产性10万m³/d规模的三沟式氧化沟作为研究对象。研究结果表明,该工艺运行稳定,满足BOD₅和悬浮物浓度小于30mg/L出现的频率分别为92％和96％;剩余污泥得到一定程度的稳定;污水处理的比能耗为1.20kW·h/去除kgBOD₅;另外还观察到反硝化运行和硝化运行的时间比tDN/tN对调节三沟式氧化沟脱氮效果起着重要的作用;并就三沟式氧化沟改扩建提出了建议。     

ORBAL氧化沟在炼油污水处理上的应用

总结了石炼污水处理场采用ORBAL氧化沟做为二级生化处理设施的成功经验，并对ORBAL氧化沟和周边进水，周边出水二沉池的运行机理进行了说明。