内循环三相好氧流化床用于废水脱硫

采用内循环好氧反应器处理模拟的含硫废水,以颗粒活性炭为载体,探讨影响反应器效果的主要因素,探求合理的运行参数。研究表明,对于不同的硫化物负荷,总存在一个最佳曝气量,使反应器的处理效率达到92％以上;HRT的减小、进水硫化物浓度的增加会降低硫化物的去除率;增加曝气量会提高反应器的去除能力;进水pH在7．5～8．5变化时对处理效果没有明显的影响;尾气中硫化物损失比率与出水硫化物浓度呈正相关,与进水pH有一定关系：反应器出水呈乳白色浑浊状时,处理效果最好。     

内循环三相好氧流化床用于废水脱硫研究

利用内循环好氧反应器处理模拟的含硫废水,以颗粒活性炭为载体,探讨影响反应器效果的主要因素,寻求合理的运行参数。本反应器的研究表明,对于不同负荷的硫化物浓度,总存在一个最佳曝气量,使反应器的处理效率达到92％以上;HRT减小、进水硫化物浓度增加会导致硫化物的去除率降低;增加曝气量会提高反应器的去处能力;进水pH值在7．5～8．5变化时对处理效果没有明显的影响;尾气中硫化物的吹脱率与出水硫化物的浓度是正相关的,另外与进水pH值有一定关系;当出水呈乳白色浑浊状时,反应器的处理效果最好。     

内循环好氧生物流化床处理糖业废水试验研究

应用内循环好氧生物流化床对COD(cr)和NH3-N质量浓度分别为350-580mg/L和7-12mg/L的甘蔗制糖废水进行处理.以人工合成的高分子颗粒作生物膜载体,通过改变空气流量和水力停留时间,考察不同操作条件下对不同浓度废水的COD(cr)和NH3-N去除效果.试验表明,在进气量为40L/h、水力停留时间为3-4...     

内循环三相生物流化床处理废水研究进展

简述了内循环三相生物流化床反应器的工作原理和工艺特性,综述了内循环三相生物流化床反应器的研究现状以及在废水处理领域中的应用实例,并分析了未来需要努力的方向。     

内循环三相生物流化床处理油脂废水

针对前人应用的三相内循环流化床作了结构上的优化和创新,并制作了9套新型内循环生物流化床反应器处理油脂废水,分别考察了处理废水过程中载体、水力停留时间、pH值、水力负荷、曝气量等操作因素对处理效果的不同影响。研究表明,该新型流化床处理油脂废水的最佳操作条件为:陶粒为最佳载体,pH值6.8—7.8,水力停留时间2.5—3.7 h,曝气量1.0—1.6 L/min,在油脂质量浓度较大时有必要适当添加表面活性剂增加其生物降解程度。该生物流化床具有很强的抗水力负荷及油脂质量浓度负荷冲击能力。     

三相气提升循环流化床处理焦化废水

实验室规模的研究表明，用三相气提升内循环流化床反应器（ＡＩＬＲ）处理焦化污水比活性污泥法为优。其处理负荷高，ＣＯＤ的进水负荷为１３ｋｇ／ｄ·ｍ＾３，ＣＯＤ去除的容积负荷可达到７ｋｇ／ｄ·ｍ＾３。ＡＩＬＲ对酚、氰等污染物的耐受力强、去除效果好并具有较低的曝气能耗；其ＣＯＤ去除率为５４．４％￣７６％，酚去除率为９９．５％￣９９．８％，氰去除率为９５％￣９９．２％；曝气能耗是活性污泥法的１／３￣１／４。     

三相内循环生物流化床处理废水的研究

以活性碳和陶瓷颗粒为载体粒子,采用快速排泥挂膜法启动实验,在反应器的运行过程中逐渐加大进气量及进水量,直至出水COD浓度达到一个较低水平.分别考虑了进水COD浓度、空气流量、废水流量、容积负荷四个因素对COD去除率的影响.结果表明:当系统运行到第13 d时,COD的去除率达到了一个较大值,并趋于稳定.     

水解酸化-好氧工艺处理制浆造纸中段废水

介绍了水解酸化-好氧工艺的特点,对水解酸化-好氧工艺在制浆造纸中段废水处理中的应用进行了综述,论述了水解酸化-生物接触氧化工艺的研究进展,并指出了水解酸化-生物接触氧化工艺处理制浆造纸中段废水是一种比较适合我国中小型造纸厂的有效的处理工艺。     

"内循环三相生物流化床"在合成洗涤剂生产废水处理中的应用

一、概述 合成洗涤剂生产废水中的主要污染物有表面活性剂(LAS)油类、酸、碱、有机磷等.废水中的COB、BOD都比较高,加上排放无规律,pH值、各污染物含量波动较大,因此废水的处理一直是一个难题,尤其是LAS,油的处理难度更大.     

A three‐phase fluidized bed reactor in the combined anaerobic/aerobic treatment of wastewater

Aerobic degradation or polishing is an essential step in the combined anaerobic/aerobic treatment of wastewater. In this study, a type of porous glass beads was used for immobilization of microbial cells in a three‐phase aerobic fluidized bed reactor (AFBR) with an external liquid circulation. The effects of superficial gas and liquid velocities on bed expansion, solid and gas hold‐ups and specific oxygen mass transfer rate, k_La, were investigated. A tracer study showed that the mixing and flow pattern in the 8 dm³ reactor could be simulated by a non‐ideal model of two continuous stirred tank reactors (CSTRs) in series. By treating an effluent from an upflow anaerobic sludge blanket (UASB) digester, the distribution of suspended and immobilized biomass in the reactor as well as the kinetics of COD removal were determined. The specific oxygen mass transfer rate, k_La, at a superficial gas velocity of 0.7 cm s⁻¹ dropped by about 30% from 32 h⁻¹ in tap water to 22 h⁻¹ after a carrier load of 15% (v/v) was added. The measured k_La further dropped by about 20% to 18 h⁻¹ in the wastewater, a typical value of the bubbling fermenters with no stirring. Compared with the aerobic heterotrophs under optimum growth conditions, the microbes in this reactor which was fed with anaerobic effluent plus biomass behaved like oligotrophs and showed slow specific COD removal rates. This might be attributed to the presence of a significant amount of obligate anaerobes and facultative organisms in the aerobic reactor. This was confirmed by a relatively low intrinsic oxygen uptake rate of the microbial population in the reactor, 94 mg O₂ dm⁻³ h⁻¹ or 19 mg O₂g VS⁻¹ h⁻¹. © 1999 Society of Chemical Industry     

炼油废水生物流化床处理工业应用研究

介绍了一套有效体积为150m3、高径比为3.3的多导流筒生物流化床反应器工业试验装置,应用复合载体及生物菌群处理洛阳炼油厂炼油废水。用一级生化及一级沉淀两级工序代替原工艺六级组合工序。在反应温度为35℃,pH值为7,气液比为20∶1,水力停留时间为6.5h的优化试验条件下,使处理后废水中化学需氧量(COD)和氨氮(NH3-N)降解率分别大于85%和90%,即COD<100mg/L,NH3-N质量浓度<10mg/L,优于国家一级排放标准(GB8978—1996)。新工艺的占地面积、停留时间、产泥量及每吨水运行费用分别是老工艺的1/10、1/3、1/3和2/3。     

流化床干燥器中临界湿含量测定

介绍用气相法和固相法测定流化状态下物料临界湿含量的方法，并将实验结果与洞道式干燥器中测得的数据做了比较。结果表明，用气相法测定流化状态下物料临界湿含量具有操作简便、快速和省料的优点。     

Enhancement of the liquid feed distribution in gas‐solid fluidized beds by nozzle pulsations (induced by solenoid valve)

In this work, it was found that spray nozzles pulsations greatly improved the liquid feed spray distribution on fluidized bed particles. Pulsating a spray nozzle doubled its nozzle performance index at various operating conditions. The objective of this study was to impose fluctuations of well‐defined frequency and amplitude on the liquid spray to investigate potentially beneficial effects of fluctuations on the liquid feed distribution on the particles in the fluidized bed. Three sets of experiments were conducted to study the quality of the spray jet‐bed interaction using a conductance probe method. The jet penetration for each experiment was calculated theoretically. © 2011 American Institute of Chemical Engineers AIChE J, 2011