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Acid resistance of methanogenic bacteria in a two-stage anaerobic process treating high concentration

ZHOU Xuefei, REN Nanqi

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 1,   Pages 53-56 doi: 10.1007/s11783-007-0010-8

Abstract: In this study, the two-stage upflow anaerobic sludge blanket (UASB) system and batch experiments were employed to evaluate the performance of anaerobic digestion for the treatment of high concentration methanol wastewater. The acid resistance of granular sludge and methanogenic bacteria and their metabolizing activity were investigated. The results show that the pH of the first UASB changed from 4.9 to 5.8 and 5.5 to 6.2 for the second reactor. Apparently, these were not the advisable pH levels that common methanogenic bacteria could accept. The methanogenic bacteria of the system, viz. Methanosarcina barkeri, had some acid resistance and could still degrade methanol at pH 5.0. If the methanogenic bacteria were trained further, their acid resistance would be improved somewhat. Granular sludge of the system could protect the methanogenic bacteria within its body against the impact of the acidic environment and make them degrade methanol at pH 4.5. The performance of granular sludge was attributed to its structure, bacteria species, and the distribution of bacterium inside the granule.

Keywords： pH     Granular     upflow anaerobic     advisable pH     methanogenic    

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microbial community in intermittently aerated sequencing batch reactors (SBR) and a traditional SBR treating

Xiaolin Sheng, Rui Liu, Xiaoyan Song, Lujun Chen, Kawagishi Tomoki

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 3, doi: 10.1007/s11783-017-0929-3

Abstract: SBR) and two intermittently aerated sequencing batch reactors (IASBRs) were parallelly operated for treating

Keywords： piggery wastewater     Intermittent aeration     Microbial community     Partial nitrification–denitrification process    

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of wastewater toxicity and change of microbial community in a hydrolysis acidification reactor pre-treating

Xin Xing, Yin Yu, Hongbo Xi, Guangqing Song, Yajiao Wang, Jiane Zuo, Yuexi Zhou

Frontiers of Environmental Science & Engineering 2018, Volume 12, Issue 6, doi: 10.1007/s11783-018-1055-6

Abstract:

HAP was verified to reduce the toxicity of TMP wastewater effectively.

Actual TMP wastewater was fed in HAP with different dilution ratios for 240 days.

Formaldehyde, 2-ethylacrolein, TMP and 2-ethylhexanol were all greatly removed.

Firmicutes became the dominant phylum (the abundance increased to 57.08%).

Keywords： Trimethylolpropane wastewater     Hydrolysis acidification process     Toxicity     Oxygen uptake rate     16S rDNA    

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Performance of inverse fluidized bed bioreactor in treating starch wastewater

M. RAJASIMMAN, C. KARTHIKEYAN

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 3,   Pages 235-239 doi: 10.1007/s11705-009-0020-0

Abstract: Aerobic digestion of starch industry wastewater was carried out in an inverse fluidized bed bioreactor using low-density (870 kg/m ) polypropylene particles. Experiments were carried out at different initial substrate concentrations of 2250, 4475, 6730, and 8910 mg COD/L and for various hydraulic retention times (HRT) of 40, 32, 24, 16, and 8 h. Degradation of organic matter was studied at different organic loading rates (OLR) by varying the HRT and the initial substrate concentration. From the results it was observed that the maximum COD removal of 95.6% occurred at an OLR of 1.35 kg COD/(m ·d) and the minimum of 51.8% at an OLR of 26.73 kg COD/(m ·d). The properties of biomass accumulation on the surface of particles were also studied. It was observed that constant biomass loading was achieved over the entire period of operation.

Keywords： inverse fluidization     low-density particles     polypropylene     starch     biofilm    

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Integrated process of nanofiltration for treating salty water during tide of Qiantang River

Bi Fei,Chen Xiaojie,Chen Shuichao,Chen Huanlin,Sun Zhilin

Strategic Study of CAE 2014, Volume 16, Issue 7,   Pages 53-56

Abstract:

This study focused on preparing drinking water from the tidal salty water of Qiantang River by nanofiltration technology. Some commercial nanofiltration membranes were compared and the performance of optimized membrane was measured. A nanofiltration pilot-scale system with 500 m3/d was operated and optimized. The results showed that it was effective in removing the salt and reducing the organic pollutants from tidal water for nanofiltration technology, and nanofiltration could play an important role of security for drinking water.

Keywords： Qiantang River     tidal salty water     nanofiltration     security of the drinking water    

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Traditional Chinese Medicine Is a Great Treasure House——Discussing the Argument of Canceling Traditional Chinese M edicine

Feng Guorui

Strategic Study of CAE 2007, Volume 9, Issue 7,   Pages 27-34

Abstract:

his thesis thinks that traditional Chinese medicine is a great treasure house. First, it expounds that the creams of traditional Chinese medicine are rarities of traditional Chinese culture, and traditional Chinese medicine contributes a lot to the multiplication and prosperousness of the Chinese nation. Then, it clarifies the basic characteristics of traditional Chinese medicine. Finally, it points out the way of learning widely from others'strong points and synthesizing innovation for establishing new form medicine system.

Keywords： traditional Chinese medicine     Western medicine     human body system     treating process     materialist dialectics    

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Factors affecting simultaneous nitrification and denitrification in an SBBR treating domestic wastewater

LI Jun, GU Guowei, PENG Yongzhen, WEI Su

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 2,   Pages 246-250 doi: 10.1007/s11783-007-0042-0

Abstract: An aerobic sequencing batch biofilm reactor (SBBR) packed with Bauer rings was used to treat real domestic wastewater for simultaneous nitrification and denitrification. The SBBR is advantageous for creating an anoxic condition, and the biofilm can absorb and store carbon for good nitrification and denitrification. An average concentration of oxygen ranging from 0.8 to 4.0 mg/L was proved very efficient for nitrification and denitrification. Volumetric loads of TN dropped dramatically and effluent TN concentration increased quickly when the concentration of average dissolved oxygen was more than 4.0 mg/L. The efficiency of simultaneous nitrification and denitrification (SND) increased with increasing thickness of the biofilm. The influent concentration hardly affected the TN removal efficiency, but the effluent TN increased with increasing influent concentration. It is suggested that a subsequence for denitrification be added or influent amount be decreased to meet effluent quality requirements. At optimum operating parameters, the TN removal efficiency of 74% 82% could be achieved.
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Nitrification and denitrification in biological activated carbon filter for treating high ammonia source

LIU Jianguang, ZHANG Xiaojian, WANG Zhansheng

Frontiers of Environmental Science & Engineering 2008, Volume 2, Issue 1,   Pages 94-98 doi: 10.1007/s11783-008-0020-1

Abstract: Since the ammonia in the effluent of the traditional water purification process could not meet the supply
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nitrobenzene on the performance and bacterial community in an expanded granular sludge bed reactor treating

Jun Li, Wentao Li, Gan Luo, Yan Li, Aimin Li

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 1, doi: 10.1007/s11783-019-1090-y

Abstract: listitem>

Genus Desulfovibrio played the key role in anaerobic sulfate reduction process

Keywords： Nitrobenzene (NB)     Sulfate-reducing bacteria (SRB)     Bacterial community     Sulfate reduction     High-throughput sequencing    

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retention time on behavior of antibiotics and antibiotic resistance genes in aerobic granular reactor treating

Jie Liao, Chaoxiang Liu, Lin Liu, Jie Li, Hongyong Fan, Jiaqi Ye, Zhichao Zeng

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 3, doi: 10.1007/s11783-019-1115-6

Abstract:

Longer HRT can enhance degradation rate of sulfamethoxazole in granular reactor.

Longer HRT can reduce accumulated concentrations of TCs and QNs in sludge.

Longer HRT may have increased relative abundances of ARGs in aerobic granules.

Keywords： Aerobic granules     Swine wastewater     Tetracyclines     Fluoroquinolones     Sulfonamides    

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Comparative experiment on treating digested piggery wastewater with a biofilm MBR and conventional MBR

Xiaoyan Song,Rui Liu,Lujun Chen,Tomoki Kawagishi

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 2, doi: 10.1007/s11783-017-0919-5

Abstract: membrane bioreactor (BF-MBR) and a conventional membrane bioreactor (MBR) were parallelly operated for treating

Keywords： Alkalinity     Antibiotics     Biofilm     Digested piggery wastewater (DPW)     Membrane bioreactor    

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Influence of aeration intensity on the performance of A/O-type sequencing batch MBR system treating azo

Xinhua WANG, Jingmei LI, Xiufen LI, Guocheng DU

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 4,   Pages 615-622 doi: 10.1007/s11783-011-0362-y

Abstract: present investigation, an anoxic/aerobic-type (A/O-type) sequencing batch MBR system, added anoxic process

Keywords： batch membrane bioreactor     azo dye     aeration intensity     extracellular polymeric substances     sludge properties    

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Effects of design parameters on performance and cost analysis of combined ultraviolet-biofilter systems treating

Can WANG, Jinying XI, Hongying HU, Insun KANG

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 4,   Pages 588-594 doi: 10.1007/s11783-012-0433-8

Abstract: A conceptual mathematical model was used to evaluate the design parameters of a combined ultraviolet (UV)-biofilter system, and perform a cost analysis. Results showed that the UV light source strength and the gas residence times in the UV system (UVRT) and biofilter (EBRT) had positive effects on the overall chlorobenzene removal efficiency of the system. High ratio of UVRT to EBRT improved the removal efficiency, suggesting that the UV system has a greater effect on the overall performance of the system compared with the biofilter. Analysis of the capital and operating costs showed that the capital costs of the standalone biofilter system were much higher than those of the standalone UV system. However, the biofilter operating costs were lower than those of the UV system. The operating costs of the combined UV-biofilter system increased with increasing UVRT/EBRT ratio, whereas its capital costs decreased.

Keywords： volatile organic compounds     ultraviolet (UV) photodegradation     biofilter     modeling     cost analysis    

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The preparation and performance of lignin-based activated carbon fiber adsorbents for treating gaseous

Min Song, Wei Zhang, Yongsheng Chen, Jinming Luo, John C. Crittenden

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 3,   Pages 328-337 doi: 10.1007/s11705-017-1646-y

Abstract: Two types of lignin-based carbon fibers were prepared by electrospinning method. The first was activated with Fe O (LCF-Fe), and the second was not activated with Fe O (LCF). Gas phase adsorption isotherms for toluene on LCF-Fe and LCF were studied. The gas phase adsorption isotherm for 0% RH showed LCF-Fe have about 439 mg/g adsorption capacity which was close to that of commercially available activated carbon (500 mg/g). The Dubinin-Radushkevich equation described the isotherm data very well. Competitive adsorption isotherms between water vapor and toluene were measured for their RH from 0 to 80%. The effect of humidity on toluene gas-phase adsorption was predicted by using the Okazaki et al. model. In addition, a constant pattern homogeneous surface diffusion model (CPHSDM) was used to predict the toluene breakthrough curve of continuous flow-packed columns containing LCF-Fe, and its capacity was 412 mg/g. Our study, which included material characterization, adsorption isotherms, kinetics, the impact of humidity and fixed bed performance modeling, demonstrated the suitability of lignin-based carbon fiber for volatile organic compound removal from gas streams.

Keywords： lignin     carbon fiber     electrospinning     toluene     humidity    

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Mechanism studies on nitrogen removal when treating ammonium-rich leachate by sequencing batch biofilm

XU Zhengyong, YANG Zhaohui, ZENG Guangming, XIAO Yong, DENG Jiuhua

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 1,   Pages 43-48 doi: 10.1007/s11783-007-0008-2

Abstract: The nitrogen removal mechanism was studied and analyzed when treating the ammonium-rich landfill leachate

Keywords： undulation     33-days stabilization     concentration debasement     temperature     accumulation    

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Title Author Date Type Operation

Acid resistance of methanogenic bacteria in a two-stage anaerobic process treating high concentration

ZHOU Xuefei, REN Nanqi

Journal Article

microbial community in intermittently aerated sequencing batch reactors (SBR) and a traditional SBR treating

Xiaolin Sheng, Rui Liu, Xiaoyan Song, Lujun Chen, Kawagishi Tomoki

Journal Article

of wastewater toxicity and change of microbial community in a hydrolysis acidification reactor pre-treating

Xin Xing, Yin Yu, Hongbo Xi, Guangqing Song, Yajiao Wang, Jiane Zuo, Yuexi Zhou

Journal Article

Performance of inverse fluidized bed bioreactor in treating starch wastewater

M. RAJASIMMAN, C. KARTHIKEYAN

Journal Article

Integrated process of nanofiltration for treating salty water during tide of Qiantang River

Bi Fei,Chen Xiaojie,Chen Shuichao,Chen Huanlin,Sun Zhilin

Journal Article

Traditional Chinese Medicine Is a Great Treasure House——Discussing the Argument of Canceling Traditional Chinese M edicine

Feng Guorui

Journal Article

Factors affecting simultaneous nitrification and denitrification in an SBBR treating domestic wastewater

LI Jun, GU Guowei, PENG Yongzhen, WEI Su

Journal Article

Nitrification and denitrification in biological activated carbon filter for treating high ammonia source

LIU Jianguang, ZHANG Xiaojian, WANG Zhansheng

Journal Article

nitrobenzene on the performance and bacterial community in an expanded granular sludge bed reactor treating

Jun Li, Wentao Li, Gan Luo, Yan Li, Aimin Li

Journal Article

retention time on behavior of antibiotics and antibiotic resistance genes in aerobic granular reactor treating

Jie Liao, Chaoxiang Liu, Lin Liu, Jie Li, Hongyong Fan, Jiaqi Ye, Zhichao Zeng

Journal Article

Comparative experiment on treating digested piggery wastewater with a biofilm MBR and conventional MBR

Xiaoyan Song,Rui Liu,Lujun Chen,Tomoki Kawagishi

Journal Article

Influence of aeration intensity on the performance of A/O-type sequencing batch MBR system treating azo

Xinhua WANG, Jingmei LI, Xiufen LI, Guocheng DU

Journal Article

Effects of design parameters on performance and cost analysis of combined ultraviolet-biofilter systems treating

Can WANG, Jinying XI, Hongying HU, Insun KANG

Journal Article

The preparation and performance of lignin-based activated carbon fiber adsorbents for treating gaseous

Min Song, Wei Zhang, Yongsheng Chen, Jinming Luo, John C. Crittenden

Journal Article

Mechanism studies on nitrogen removal when treating ammonium-rich leachate by sequencing batch biofilm

XU Zhengyong, YANG Zhaohui, ZENG Guangming, XIAO Yong, DENG Jiuhua

Journal Article