共查询到20条相似文献,搜索用时 62 毫秒
1.
Soon-An Ong Eiichi Toorisaka Makoto Hirata Tadashi Hano 《Environmental Chemistry Letters》2005,2(4):203-207
We studied the biodegradation of Orange II in a sequential anaerobic and aerobic-sequencing batch reactor system. Granular activated carbon was used either packed into a column or added directly into the anaerobic reactor to investigate the treatment performance between the two operation conditions. We found that the circulation of mixed liquor between the anaerobic reactor and the carbon-packed column enhanced the chemical oxygen demand from 28 to 52% and Orange II removal efficiencies from 88 to 96%, under simultaneous adsorption and biodegradation process. The morphology of microbes was observed under an electron-scanning microscope. 相似文献
2.
This study evaluated the influence of clinoptilolite on the performance of activated sludge system shocked by high concentration of ammonium. The ammonium and chemical oxygen demand (COD) removal from the experimental reactor containing clinoptilolite and from the clinoptilolite-free control reactor was determined. The ammonium and COD removal was approximately 8 and 20% higher in the experimental reactor than in the control reactor, respectively. The removal increased with an increase in clinoptilolite concentration over the tested range up to 50?mg?L?1. The presence of clinoptilolite resulted in the sludge flocs being more compacted with smoother surfaces and edges. Molecular biological analysis revealed that clinoptilolite increased the DNA diversity, richness, and evenness of sludge microbes. The enhanced-performance activated sludge previously treated with clinoptilolite was less influenced by the shock of ammonium than non-treated sludge in terms of the ammonium and COD removal. These results suggest that clinoptilolite enhanced the performance of activated sludge system in the removal of ammonium and COD. Amendment of activated sludge with natural zeolites may thus improve the efficiency of wastewater treatment. 相似文献
3.
Lijie Li Qunhui Wang Xuesong Li Shuo Yang 《Frontiers of Environmental Science & Engineering》2008,2(1):32-35
During brewery wastewater treatment by a hydrolyzation-food chain reactor (FCR) system, sludge was recycled to the anaerobic segment. With the function of hydrolyzation acidification in the anaerobic segment and the processes of aerobic oxidation and antagonism, predation, interaction and symbiosis among microbes in multilevel oxidation segment, residual sludge could be reduced effectively. The 6-month dynamic experiments show that the average chemical oxygen demand (COD) removal ratio was 92.6% and average sludge production of the aerobic segment was 8.14%, with the COD of the influent at 960–1720 mg/L and hydraulic retention time (HRT) of 12 h. Since the produced sludge could be recycled and hydrolyzed in the anaerobic segment, no excess sludge was produced during the steady running for this system. 相似文献
4.
G. Sekaran S. Karthikeyan K. Ramani B. Ravindran A. Gnanamani A. B. Mandal 《Environmental Chemistry Letters》2011,9(4):499-504
This is the first report on the heterogeneous oxidation of dissolved organics in wastewater with little consumption of Fenton’s
reagent and without sludge production. The salt-laden wastewater discharged from leather industry has poor biodegradability
due to the presence of high total dissolved solids. This wastewater is evaporated in solar evaporation pans. The evaporated
residue faces disposal problem due to high concentration of organic and inorganic salts. The present study demonstrates the
preparation, characterization and application of mesoporous activated carbon matrix along with Fenton’s reagent for the removal
of dissolved organics in wastewater. Free electron-rich mesoporous activated carbon matrices (MAC700, MAC800 and MAC900) were prepared and characterized for surface area, C, H, N, ash content, free electron density and energy gap value. Results
show that heterogeneous catalytic oxidation of dissolved organics in the wastewater decreased biochemical oxygen demand, chemical
oxygen demand, total organic carbon and dissolved protein, respectively, by 74, 69, 61 and 80% at optimum pH (3.5), H2O2 (7.5 mmol/l), FeSO4.7H2O (0.3 mmol/l) and MAC800 (10 g/l). 相似文献
5.
COD对颗粒污泥厌氧氨氧化反应性能的影响 总被引:8,自引:1,他引:8
研究了COD对颗粒污泥厌氧氨氧化反应的影响,并对颗粒污泥的厌氧氨氧化脱氮性能进行了分析.厌氧颗粒污泥取自实验室长期运行的EGSB生物脱氮反应器,实验用水为人工配水,以葡萄糖为有机碳源;主要考察了COD对NH4 -N、NO2--N、NO3--N和TN去除的影响.结果表明:当进水不含COD时,反应器对NH4 -N、NO2--N和NO3--N和TN的去除率分别为12.5%、29.1%、16.1%和16.3%;当COD浓度分别为200mg/L、350mg/L和550mg/L时,反应器对NH4 -N的去除率分别为14.2%、14.2%和23.7%,对NO2--N的去除率均接近100%,对NO3--N的去除率分别为94.5%、86.6%和84.2%,对TN的去除率分别为50.7%、46.9%和50.4%,COD去除率分别为85%、66%和60%.分析发现,在反应初期,氨氮的去除主要通过厌氧氨氧化过程实现,随着反应的进行,反硝化菌活性逐渐提高,传统的反硝化过程占优势.同时还观察到,在反应初期COD对氨氮去除的抑制作用非常明显.图2参21 相似文献
6.
Tetrahydrofuran (THF) is easy to volatilize and hard to biodegrade. Little is known about the influence and fate of tetrahydrofuran in the environment. The effects of THF were examined on dissolved oxygen, pH, culturable aerobic microbes (bacteria, actinomycetes, and fungi) and four selected enzymes (protease, phosphatase, amylase, and lipase) in wastewater. The wastewater containing some activated sludge was taken from the aeration basin in Sibao sewage plant in Hangzhou, China. THF at lower concentrations of enhanced aerobic respiration and higher concentrations decreased utilization of oxygen in wastewater. The short-term influence of THF on pH was not obvious, but the long-term effect was apparent. Inhibition of THF on culturable aerobic microbes rose with increasing THF concentrations but decreased with prolongation of incubation time. No effect of THF on the activity of protease, phosphatase, amylase, and lipase was found. Data indicate that lower concentrations of THF exert no marked influence on wastewater in an urban sewage plant. 相似文献
7.
Bin Cui Chongjun Zhang Liang Fu Dandan Zhou Mingxin Huo 《Frontiers of Environmental Science & Engineering》2023,17(6):73
8.
固定化菌藻系统及对污水中氮磷营养盐的净化效果 总被引:5,自引:0,他引:5
利用海藻酸钙分别包埋固定小球藻、活性污泥及其两者混合物.研究固定态小球藻与悬浮态小球藻对污水中氮磷营养盐的处理效果,实验结果表明固定态藻对氮磷的去除效果明显优于悬浮态藻,其原因主要由于海藻酸钙凝胶对氮磷的吸附,系统pH值提高引起氨的气提及磷酸盐的沉淀作用.研究固定化藻、同定化活性污泥及共固定化菌藻分别对污水中氮磷营养盐的处理效果,在同等条件下,固定化菌藻对氮磷的去除效果优于固定化活性污泥和固定化藻类.这项研究显示菌藻共生在污水处理中具有较大的潜力. 相似文献
9.
10.
Feng Hou Ting Zhang Yongzhen Peng Xiaoxin Cao Hongtao Pang Yanqing Shao Xianchun Lu Ju Yuan Xi Chen Jin Zhang 《Frontiers of Environmental Science & Engineering》2022,16(3):33
11.
Microorganisms capable of degrading di‐n‐butyl phthalate (DBP) were isolated by acclimated and enrichment technique. The adaptation of microorganism to DBP was investigated. The microbial cells were immobilized on ceramic particles. The results showed that the biomass adsorbed on ceramic particles can reach 85 mg dry weight/g carrier. The immobilized microbial cells were used for the treatment of wastewater containing DBP. The results demonstrated that the DBP concentration of the outlet reached the stationary‐state level of less than 1.0 mg/1 within 2 days at inlet DBP concentration of 100mg/l and 12h of hydraulic retention time. 相似文献
12.
Xue Shen Lei Lu Baoyu Gao Xing Xu Qinyan Yue 《Frontiers of Environmental Science & Engineering》2019,13(1):9
13.
Guochen ZHENG Jianzheng LI Feng ZHAO Liguo ZHANG Li WEI Qiaoying BAN Yongsheng ZHAO 《Frontiers of Environmental Science & Engineering》2012,6(1):125-130
To investigate the influence of illumination on the fermentative hydrogen production system, the hydrogen production efficiencies of two kinds of anaerobic activated sludge (floc and granule) from an anaerobic baffled reactor were detected under visible light, dark and light-dark, respectively. The 10 mL floc sludge or granular sludge was respectively inoculated to 100 mL diluted molasses (chemical oxygen demand of 8000 mg·L-1) in a 250 mL serum bottle, and cultured for 24 h at 37°C under different illumination conditions. The results showed that the floc was more sensitive to illumination than the granule. A hydrogen yield of 19.8 mL was obtained in the dark with a specific hydrogen production rate of 3.52 mol·kg-1MLVSS·d-1 (floc), which was the highest among the three illumination conditions. Under dark condition, the hydrogen yield of floc sludge reached the highest with the specific hydrogen production rate of 3.52 mol·kg-1MLVSS·d-1, and under light-dark, light, the specific hydrogen production rate was 3.11 and 2.21 mol·kg-1MLVSS·d-1, respectively. The results demonstrated that the illumination may affect the dehydrogenase activity of sludge as well as the activity of hydrogen-producing acetogens and then impact hydrogen production capacity. 相似文献
14.
Liang SUN Can WANG Min JI Fen WANG 《Frontiers of Environmental Science & Engineering》2011,5(3):481-487
Actual pharmaceutical wastewater was treated using a combined ultrasonic irradiation (US) and iron/coke internal electrolysis (Fe/C) technology. A significant synergetic effect was observed, showing that ultrasonic irradiation dramatically enhanced the chemical oxygen demand (COD) removal efficiencies by internal electrolysis. The effects of primary operating factors on COD removal were evaluated systematically. Higher ultrasonic frequency and lower pH values as well as longer reaction time were favorable to COD removal. The ratio of biochemical oxygen demand (BOD) and COD (B/C) of the wastewater increased from 0.21 to 0.32 after US-Fe/C treatment. An acute biotoxicity assay measuring the inhibition of bioluminescence indicated that the wastewater with overall toxicity of 4.3 mg-Zn2+·L-1 was reduced to 0.5 mg-Zn2+·L-1 after treatment. Both the raw and the treated wastewater samples were separated and identified. The types of compounds suggested that the increased biodegradability and reduced biotoxicity resulted mainly from the destruction of N,N-2 dimethyl formamide and aromatic compounds in the pharmaceutical wastewater. 相似文献
15.
Xi CHEN Linjiang YUAN Wenjuan LU Yuyou LI Pei LIU Kun NIE 《Frontiers of Environmental Science & Engineering》2015,9(2):324
Aerobic granules were formed in a conventional, continuous flow, completely mixed activated sludge system (CMAS). The reactor was inoculated with seed sludge containing few filaments and fed with synthetic municipal wastewater. The settling time of the sludge and the average dissolved oxygen (DO) of the reactor were 2 h and 4.2 mg·L-1, respectively. The reactor was agitated by a stirrer, with a speed of 250 r·min-1, to ensure good mixing.The granular sludge had good settleability, and the sludge volume index (SVI) was between 50 and 90 mL·g-1. The laser particle analyzer showed the diameter of the granules to be between 0.18 and 1.25 mm. A scanning electron microscope (SEM) investigation revealed the predominance of sphere-like and rod-like bacteria, and only few filaments grew in the granules. The microbial community structure of the granules was also analyzed by polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE). Sequencing analysis indicated the dominant species were α, β, and γ-Proteobacteria, Bacteroidetes, and Firmicutes. The data from the study suggested that aerobic granules could form, if provided with sufficient number of filaments and high shear force. It was also observed that a high height-to-diameter ratio of the reactor and short settling time were not essential for the formation of aerobic granular sludge. 相似文献
16.
Lehua ZHANG Jingxing MA Yinchen JIN Haiqin ZHANG Yongdi LIU Lankun Cai 《Frontiers of Environmental Science & Engineering》2015,9(2):365-370
Hydrogen sulfide emission in sewer systems is associated with toxicity, corrosion, odour nuisance and high costs treatment. In this study, a novel method to inhibit sulfide generation from sewage by means of glutaraldehyde supplementation has been suggested and evaluated under anaerobic conditions. Different concentrations of glutaraldehyde at 10, 15, 20, 30 and 40 mg·L-1 have been investigated. Besides, the possible impacts of glutaraldehyde supplementation on an activated sludge system and an appraisal of the economic aspects are presented as well. As observed from the experimental results, a dosage of 20 mg·L-1 glutaraldehyde resulted in a significant decrease of the sulfide production by 70%–80% in the simulated sewage. Moreover, the impacts of additional glutaraldehyde at 20 mg·L-1 on activated sludge, in terms of chemical oxygen demand removal and oxygen uptake rates, were negligible. From an economical point of view, the cost of the commercial glutaraldehyde products required in the operation, which was calculated on the basis of activated sulfide removal avoidance, was around €3.7–4.6 S·kg-1. Therefore it is suggested that glutaraldehyde supplementation is a feasible technique to abate the sulfide problems in sewer systems. Yet further research is required to elucidate the optimum “booster” dosage and the dosing frequency in situ accordingly. 相似文献
17.
Qing Yang Shuying Wang Anming Yang Jianhua Guo Fengyang Bo 《Frontiers of Environmental Science & Engineering》2007,1(1):33-38
Since eutrophication has become increasingly severe in China, nitrogen and phosphorous have been the concern of wastewater treatment, especially nitrogen removal. The stabilization of the intelligent control system and nitrogen removal efficiency were investigated in a pilot-scale aerobic-anoxic sequencing batch reactor (SBR) with a treatment capacity of 60 m3/d. Characteristic points on the profiles of dissolved oxygen (DO), pH, and oxidation reduction potential (ORP) could exactly reflect the process of nitrification and denitrification. Using the intelligent control system not only could save energy, but also could achieve advanced nitrogen removal. Applying the control strategy water quality of the effluent could stably meet the national first discharge standard during experiment of 10 months. Even at low temperature (t = 13°C), chemical oxygen demand (COD) and total nitrogen (TN) in the effluent were under 50 and 5 mg/L, respectively. 相似文献
18.
Xinhua WANG Jingmei LI Xiufen LI Guocheng DU 《Frontiers of Environmental Science & Engineering》2011,5(4):615-622
Among the numerous parameters affecting the membrane bioreactor (MBR) performance, the aeration intensity is one of the most important factors. In the present investigation, an anoxic/aerobic-type (A/O-type) sequencing batch MBR system, added anoxic process as a pretreatment to improve the biodegradability of azo dye wastewater, was investigated under different aeration intensities and the impact of the aeration intensity on effluent quantity, sludge properties, extracellular polymeric substances (EPS) amount generated as well as the change of permeation flux were examined. Neither lower nor higher aeration intensities could improve A/O-type sequencing batch MBR performances. The results showed 0.15 m3·h-1 aeration intensity was promising for treatment of azo dye wastewater under the conditions examined. Under this aeration intensity, chemical oxygen demand (COD), ammonium nitrogen and color removal as well as membrane flux amounted to 97.8%, 96.5%, 98.7% and 6.21 L·m-2·h-1, respectively. The effluent quality, with 25.0 mg·L-1COD, 0.84 mg·L-1 ammonium nitrogen and 8 chroma, could directly meet the reuse standard in China. In the meantime, the sludge relative hydrophobicity, the bound EPS, soluble EPS and EPS amounts contained in the membrane fouling layer were 70.3%, 52.0 mg·g-1VSS, 38.8 mg·g-1VSS and 90.8 mg·g-1VSS, respectively, which showed close relationships to both pollutant removals and membrane flux. 相似文献
19.
Yi Chen Shilong He Mengmeng Zhou Tingting Pan Yujia Xu Yingxin Gao Hengkang Wang 《Frontiers of Environmental Science & Engineering》2018,12(5):13
20.
酸化—吹气—吸收法测定水及废水中的硫化物 总被引:1,自引:0,他引:1
本文设计了硫化物测定的酸化-吹气-吸收装置,验证了装置对硫化的回收效果,对硫化物标准溶液的配制及其稳定性进行了研究,对分析条件进行了最佳选择,建立了亚甲基监光度法测定硫化物的分析方法,并对实际样品进行了测定。本方法的检出限为0.005mgS^2-/l,线性范围为0.005-0.700mgS^2-/l,可应用于水和废水样品中微量硫化物的测定。 相似文献