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1.
A sequencing batch reactor (SBR) seeded with activated sludge was established for landfill leachate treatment. Small bio-aggregates
began to appear after 40-d operation, and gradually changed to mature aerobic granules, with a mean size of 0.36–0.60 mm.
Their sludge volume index at 5 min (SVI5 min), mixed liquor volatile suspended solids (MLVSS), and wet density were around 35 ml/g, 3.4 g/L, and 1.062 g/cm3, respectively. The settling velocities of the granules in distilled water ranged from 0.3 to 1.3 cm/s, which were faster
than those in landfill leachate with a salt content of 1.4% (w/v), and also slightly faster than those predicted by Stokes’
law for porous but impermeable particles. Microbial community evolution during the granulation process and stages under different
nitrogen loading rates (NLRs) were monitored and analyzed by polymerase chain reaction-denaturing gradient gel electrophoresis
(PCR-DGGE), cloning, and sequencing of 16S ribosomal RNA (rRNA) fragments. Results revealed that some primary and dominant
communities in inoculating activated sludge died out gradually; while a few common bacteria, inhabiting soils, municipal wastewater,
or activated sludge systems, dominated in the SBR system throughout. In addition, some other dominant species, associated
with the aerobic granulation process, were thought to play a significant role in the formation and growth of aerobic granular
sludge. During the stable operation time under low NLR, a few species were present in abundance, and may have been responsible
for the high organic removal efficiency at this time. 相似文献
2.
研究了组合工艺(高温55℃UASB反应器一常温三相好氧生物流化床)对含盐偶氮染料活性嫩黄X-6G的去除能效。试验结果表明:在水温为55℃,运行周期120d,水力停留时间18h的条件下,此工艺对于CODCr为600～1 000mg/L,含盐量为25～35g/L,活性嫩黄X-6G的浓度为40～50mg/L的染料废水,染料及CODCr的去除率可达80%～90%。 相似文献
3.
选取100日龄健康北京蛋鹌鹑6000只,随机分成3组,A组为对照组,B、C组分别给予中草药粉剂、冲剂,按日粮的0．1％添加。试验表明：40天的试验期内,试验组与对照组相比料蛋比、产蛋总重、产蛋率、蛋破损率、死淘率、经济效益差异显著（P〈0．05）,平均蛋重、畸形蛋差异不显著（P〉0．05）;血清总蛋白、血清白蛋白、血清球蛋白、血钙、血磷、碱性磷酸酶、总甲状腺激素（T3、T4）升高（P〈0．05）,血糖、乳酸脱氢酶、皮质醇（Cor）下降（P〈O．05）,雌二醇（E2）变化不显著（P〉0．05）。 相似文献
4.
INTRODUCTION The use of anaerobic process to treat municipal organic solid waste (MOSW) has dramatically in-creased recently. Anaerobic digestion can be carried out under ambient (<25 °C), mesophilic (25~45 °C) and thermophilic (>45 °C) conditions (El-Mashad et al., 2004). Thermophilic digestion has many advan-tages such as higher metabolic rate and higher con-sequent specific growth rate compared with meso-philic digestion, although the thermophilic bacteria death rate is higher (… 相似文献
5.
陈红 《浙江大学学报(A卷英文版)》2004,5(6):727-732
Specific ATP content of volatile solids was measured to characterize the sludge activity in a sequential anaerobic/aerobic wastewater treatment system, with an upflow anaerobic sludge blanket (UASB) reactor and a three-phase aerobic fluidized bed (AFB) reactor. The wastewater COD level was 2000(3000 mg/L in simulation of real textile wastewater. The ATP content and the specific ATP contents of volatile solids at different heights of the UASB reactor and those of the suspended and immobilized biomass in the AFB reactor were measured. In the UASB reactor, the maximum value of specific ATP (0.85 mg ATP/g VS) was obtained at a hydraulic retention time (HRT) 7.14 h in the blanket solution. In the AFB reactor, the specific ATP content of suspended biomass was higher than that of immobilized biomass and increased with hydraulic retention time reaching a maximum value of 1.6 mg ATP/g VS at hydraulic retention time 4.35 h. The ATP content of anaerobes in the UASB effluent declined rapidly under aerobic conditions following a 2nd-order kinetic model. 相似文献
6.
INTRODUCTION limiting conditions, obligatory aerobic and an- aerobic bacteria will survive in a mixed culture Sequential anaerobic/aerobic wastewater treat- (Gerritse et al., 1992). Little is know about thement has received increasing attention for effective change in the activity of anaerobic bacteria whennutrient removal, enhanced de… 相似文献
7.
HUSTserver:一种可靠的高性能附网存储系统的实现 总被引：2，自引：0，他引：2
1 Introduction Emergingapplicationssuchasdatawarehousing ,multimediacontentdistribution ,electroniccom merce ,medicaldatabaseandsatellitedatabaseshavesubstantialstoragerequirementsthataregrowingatadramaticallyrate .Suchapplicationsrequirescalable ,highly availableandcost effectivestoragesystems .Traditionalstoragesystemsrelyonacentralcon troller (fileserver ,diskarraycontroller)toaccessstorageandcopydatabetweenstoragedevicesandclients,whichlimitstheirscalability .Withthedra maticshifttowards… 相似文献
8.
《天津大学学报(英文版)》2017,(6)
As a kind of aerobic bacteria, Saccharopolyspora spinosa exhibits a high demand for oxygen. In the fermentation process, the methods of increasing ventilation and improving agitation speed are usually adopted to achieve higher values of dissolved oxygen. These methods decrease the efficiency of spinosad biosynthesis.In this study, an improved reactor was designed to solve these problems. The exhaust gas reflux device, impellers,and baffles were improved. Furthermore, we established the kinetic models for the cell growth, substrate consumption and spinosad generation in batch fermentation process. The simulation results were in good agreement with the experimental data. Spinosad production reached 583.86 mg/L after employing the suitable feeding strategy by fed-batch fermentation in the improved reactor, whereas it was only 157.01 mg/L before optimization. The method described can provide insight to strengthen spinosad production and can be extended to the culturing process of filamentous aerobic bacteria. 相似文献
9.
实验制作了具有10个隔室的厌氧折流板反应器用于探讨其处理高浓度有机污水的性能和运行的稳定性。研究结果表明该反应器在较高有机负荷条件下可以维持较为稳定的运行且表现出优良的COD去除率(85%以上),运行50天后出现颗粒状污泥,颗粒结实而致密。在不同的有机负荷条件下的抗冲击能力强,COD的去除和运行稳定。 相似文献
10.
《Journal of College Student Psychotherapy》2013,27(3):37-55
Abstract Our purpose was to examine the effects of cognitive group therapy, aerobic exercise, or their combination on anxiety reduction. Seventy participants were divided into four groups: cognitive group therapy, aerobic exercise, both treatments, or control. Participants were administered the State-Trait Anxiety Inventory (STAI) before and after the study, and at a two-month follow-up. Results indicate that all interventions were equally effective in reducing anxiety as compared to no intervention. The combination of cognitive group therapy and exercise was not significantly more effective than either cognitive group therapy or aerobic exercise alone. Although effects were not maintained after two months, it is unclear whether this is attributable to the limitations of such interventions in changing more enduring traits. Possible mechanisms for change are discussed. 相似文献
11.
The characteristics of the start-up period of single-step autotrophic nitrogen removal process were investigated. The autotrophic nitrogen removal process used a sequencing batch reactor to treat wastewater of medium to low ammonia-nitrogen concentration, with dissolved oxygen （DO）, hydraulic retention time （HRT） and temperature controlled. The experimental conditions were temperature at （30±2） ℃, ammonia concentration of （60 to 120） mg/L, DO of （0.8 to 1.0） mg/L, pH from 7.8 to 8.5 and HRT of 24 h. The rates of nitrification and nitrogen removal turn out to be 77% and 40%, respectively, after a start up period going through three stages divided according to nitrite accumulation： sludge domestication, nitrifying bacteria selection and sludge adaptation, It is demonstrated that dissolved oxygen is critical to nitrite accumulation and elastic YJZH soft compound packing is superior to polyhedral hollow balls in helping the bacteria adhere to the membrane. 相似文献
12.
对培养嗜高浓度甲醛废水的活性污泥的净化性能进行了研究,研究中采用序批式活性污泥法（SBR）及脱氮除磷工艺（A2/O工艺）．考察了停留时间、溶解氧多少、进水的pH值和水温等对微生物净化高浓度甲醛废水的影响。实验结果表明,进水的pH值在7～9范围内,水温在10～30℃,停留时间控制在48小时,并根据进水浓度的变化选择合适的溶解氧,获得的活性污泥的净化性能最佳。 相似文献
13.
为了快速培养出能同时去除生活污水中化学需氧量(COD)和氮的微氧颗粒污泥,采用膨胀颗粒污泥床(EGSB)反应器接种污水处理厂剩余污泥,研究了微氧颗粒污泥的培养过程以及稳定运行条件下供氧量对处理效果和污泥性能的影响。结果表明,水力停留时间(HRT)为6h,微氧颗粒污泥的成功培养仅需1个月;供氧速率在2.83.2gO2/d,COD,NH3-N和总氮(TN)的去除率最高分别可达91%,85%和81%,脱氮速率达1.7gN/d,出水水质最佳;成熟的微氧颗粒污泥粒径集中在0.453.2gO2/d,COD,NH3-N和总氮(TN)的去除率最高分别可达91%,85%和81%,脱氮速率达1.7gN/d,出水水质最佳;成熟的微氧颗粒污泥粒径集中在0.452mm,当供氧速率低于2.3gO2/d时,颗粒污泥结构致密,供氧速率在2.32mm,当供氧速率低于2.3gO2/d时,颗粒污泥结构致密,供氧速率在2.33.2gO2/d时,污泥性能稳定,供氧速率增加到3.2gO2/d时,污泥沉降性能下降,并出现颗粒解体和丝状菌生长优势。 相似文献
14.
啤酒厂厌氧池(UASB)的调节与恢复 总被引：1，自引：0，他引：1
针对某啤酒厂污水处理过程中使用的升流式厌氧池(UASB)进行了调节与恢复,通过监测厌氧池的pH与COD等数据找出UASB反应器处理效果差的原因,然后对三相分离器、布水管等进行调整,并二次启动厌氧池,恢复了UASB反应器的处理功能. 相似文献
15.
本文讨论了使用凌阳科技公司的SPCE061A单片机作为主控制器,采用一线制数字温度传感器DS18820作为温度传感器和液晶1602作为显示器件,以及SPR1024作为数据存储器的应用方案。该方案实现了目标温度的测量、显示、存储与PC机传输数据的功能。 相似文献
16.
17.
基于L9(34)正交试验,本文对过共晶Al-20Si合金进行变质处理。通过直观和方差分析,确定最佳的变质工艺参数。结果表明：正交试验最佳的工艺参数为A2B2C1D2,变质工艺参数为0.04%的P添加量,0.6%的RE混合稀土添加量,20 min的变质时间以及780℃的变质温度,此时初生Si相转变为规则的六边形,平均尺寸为24.84μm,共晶硅相细化明显;因素A （P添加量）对变质效果有显著影响,B、C、D因素（分别为RE混合稀土添加量、变质时间和变质温度）对变质效果有一定的影响作用,各因素的影响程度分别为P添加量>RE混合稀土添加量>变质温度>变质时间。 相似文献
18.
Zhi Huang Zhao-bo Chen Nan-qi Ren Dong-xue Hu Dong-huan Zheng Zhen-peng Zhang 《浙江大学学报(A卷英文版)》2009,10(11):1642-1650
To improve the working and living environment of submarine crews, an integrated system of CO2 removal and O2 regeneration was designed to work under experimental conditions for 50 people in a submarine cabin during prolonged voyages. The integrated system comprises a solid amine water desorption （SAWD） unit for CO2 collection and concentration, a Sabatier reactor for CO2 reduction and a solid polymer electrolyte （SPE） unit for O2 regeneration by electrolysis. The performances of the SAWD-Sabatier-SPE integrated system were investigated. The experimental results from the SAWD unit showed that the average CO2 concentration in the CO2 storage tank was more than 96% and the outlet CO2 concentration was nearly zero in the first 45 min, and less than 1/10 of inlet CO2 after 60 min when input CO2 was 0.5% （1000 L）. About 950 L of CO2 was recovered with a recovery rate of 92%-97%. The output CO2 concentration was less than 0.2%, which showed that the adsorption-desorption performance of this unit was excellent. In the CO2 reduction unit we investigated mainly the start-up and reaction performance of the Sabatier reactor. The start-up time of the Sabatier reactor was 6, 8 and 10 rain when the start-up temperature was 187.3, 179.5 and 168 ℃, respectively. The product water was colorless, transparent, and had a pH of 6.9-7.5, and an electrical conductivity of 80μs/cm. The sum of the concentration of metal ions （Ru^3＋, Al^3＋, Pb^2＋） was 0.028% and that of nonmetal ions （Cl^-, SO4^2-） was 0.05%. In the O2 regeneration unit, the O2 generation rate was 0.48 m^3/d and the quantity was 2400 L, sufficient to meet the submariners＇ basic oxygen demands. These results may be useful as a basis for establishing CO2-1evel limits and O2 regeneration systems in submarines or similar enclosed compartments during prolonged voyages. 相似文献
19.
In order to select the appropriate working fluids and optimize parameters for medium-temperature geothermally-powered organic Rankine cycle(ORC), R245 fa is mixed with R601 a at geothermal water temperature of 110 ℃. Based on thermodynamics, the characteristics of mixture and its influence on the performance of ORC under different evaporating temperatures and composition proportions are analyzed. Results show that the zeotropic mixture R245fa/R601a(0.4/0.6) has the highest performance. When the evaporating temperature reaches 67 ℃, the outlet temperature of geothermal water is 61 ℃, the net power output is the highest and the thermal efficiency is about 9%. 相似文献
20.
采用核壳-无皂乳液聚合技术,以丙烯酸丁酯为核,苯乙烯为壳,合成了具有高稳定性的聚（苯乙烯／丙烯酸丁酯）乳液．同时,还对不同配方的乳液及其涂膜的综合性能进行了研究,总结了组成与性能之间的关系;考察了引发剂浓度、齐聚物浓度以及反应温度对乳液性能的影响．通过单因素的分析,确定了各因素的最佳配比,硬软单体比例为St／BA=70／30,其中齐聚物MMA／AA=6／1,齐聚物的质量为单体总质量的6．0％,在壳聚合中AA占单体总量的5．0％,引发剂的用量为单体总质量的0．4％,交联剂的用量为单体总质量的0．5％。制得的乳液综合性能良好． 相似文献