检索结果-南通市图书馆

Building Simulation 2023年第10期16卷 1949-1970页

作者： Lei Zhang Guohui Feng Ainong Li Kailiang Huang Shasha Chang School of municipal and environmental engineering Shenyang Jianzhu UniversityShenyang110168China

The integrated application of multi-energy coupled technology in nearly zero-energy building(NZEB)is promising from the perspective of low-carbon development to achieve the goal of net zero ***(photovoltaic/thermal),air,and ground sources were combined organically to establish an experimental platform of a multi-source heat pump(MSHP)system,which can realize flexible switching of multi-energy *** paper presents the analytical hierarchy process and fuzzy comprehensive evaluation method to comprehensively evaluate the five modes of the MSHP system with regard to energy,economic and environmental *** results indicate that the waste heat of the PVT cavity can improve the coefficient of performance of the heat pump unit(COP)by approximately 8.0%.The initial investment in air source heat pump(ASHP)modes is lower than that of a coal-powered *** ground source heat pump(GSHP)modes have high stability and their payback period is 8.81–10.66 *** photovoltaic/thermal-dual source heat pump(PVT-DSHP)mode presents the most appropriate system applied in the NZEB in severe cold region,followed by the DSHP,GSHP,ASHP,and PVT-ASHP *** compared with other modes,COP,annual saving cost,carbon dioxide emission reduction,and comprehensive value of the PVT-DSHP mode have improved by 7.07%–29.57%,2.21%–23.88%,3.38%–14.83%,and 27.91%–52.62%,*** study provides important insights into the practical application and sustainable development of multi-energy coupled systems in the NZEB in severe cold region.

关键词： multi-energy complementarity photovoltaic/thermal heat pump nearly zero-energy building hierarchy process severe cold region

Water quality forecast through application of BP neural network at Yuqiao reservoir

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & engineering) 2007年第9期8卷 1482-1487页

作者： ZHAO Ying NAN Jun CUI Fu-yi GUO Liang School of municipal and environmental engineering Harbin Institute of Technology Harbin 150090 China

This paper deals with the study of a water quality forecast model through application of BP neural network technique and GUI (Graphical User Interfaces) function of MATLAB at Yuqiao reservoir in Tianjin. To overcome the shortcomings of traditional BP algorithm as being slow to converge and easy to reach extreme minimum value,the model adopts LM (Leven-berg-Marquardt) algorithm to achieve a higher speed and a lower error rate. When factors affecting the study object are identified,the reservoir's 2005 measured values are used as sample data to test the model. The number of neurons and the type of transfer functions in the hidden layer of the neural network are changed from time to time to achieve the best forecast results. Through simulation testing the model shows high efficiency in forecasting the water quality of the reservoir.

关键词： Water quality forecast BP neural network MATLAB Graphical User Interfaces (GUI)

Simultaneous phosphorus and nitrogen removal in a continuous-flow two-sludge system

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2006年第1期18卷 52-57页

作者： LI Xiang-kun HUANG Rong-xin BAO Lin-lin SHAO Chun-hong ZHANG Jie School of municipal and environmental engineering Harbin Institute of Technology Harbin 150090 China

The ability of simultaneous biological phosphorus and nitrogen removal was investigated in a lab-scale continuous-flow two-sludge system. Alternating anaerobic and anoxic conditions were combined with contact oxidation stage for treating raw municipal wastewater. Long-term experiments showed that the contradiction of competing for the organic substrate between denitrifying bacteria and PAOs （phosphorus accumulating organisms） in traditional phosphorus and nitrogen removal system has been resolved. The system can adapt to low influent COD/TN ratio （C/N）. Furthermore the SRT （sludge retention time） of nitrifying sludge and denitrifying phosphorus removal sludge can be controlled at optimal conditions respectively. The removal efficiency of COD, TP, TN, and NH4-N was 81.78%, 92.51%, 75.75%, and 84.47% respectively. It was also found that the appropriate influent C/N should be controlled at the range of 3.8-6, while the optimal C/N to the system ranged between 4-5, and the BFR （bypass sludge flow rate） should be controlled at 0.35 around.

关键词： continue-flow two-sludge system denitrification phosphorus removal nitrification contact oxidation

Degradation of benzophenone in aqueous solution by Mn-Fe-K modified ceramic honeycomb-catalyzed ozonation

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2006年第6期18卷 1065-1072页

作者： HOU Yan-jun MA Jun SUN Zhi-zhong YU Ying-hui ZHAO Lei School of municipal and environmental engineering Harbin Institute of Technology Harbin 150090 China

Comparative studies of ozonation alone, ceramic honeycomb-catalyzed and Mn-Fe-K modified ceramic honeycomb catalyzed ozonation processes have been undertaken with benzophenone as the model organic pollutant. The experimental results showed that the presence of Mn-Fe-K modified ceramic honeycombs significantly increased the removal rate of benzophenone and TOC compared with that achieved by ozonation alone or ceramic honeycomb-catalyzed ozonation. The electron paramagnetic resonance （EPR） experiments verified that higher benzophenone removal rate was attribute to more hydroxyl radicals generated in the Mn-Fe-K modified ceramic honeycomb-catalyzed ozonation. Under the conditions of this experiment, the degradation rate of all the three ozonation processes are increasing with the amount of catalyst, temperature and value of pH increased in the solution. We also investigated the effects of different process of ozone addition, the optimum conditions for preparing catalyst and influence of the Mn-Fe-K modified ceramic honeycomb after multiple-repeated use.

关键词： catalytic ozonation Mn-Fe-K modified ceramic honeycomb benzophenone

Antibiotic contamination control mediated by manganese oxidizing bacteria in a lab-scale biofilter

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2020年第12期32卷 47-54页

作者： Yanan Cai Jing He Jinkang Zhang Jicheng Li School of environmental and municipal engineering Qingdao University of TechnologyQingdao 266033China

Antibiotic micro-pollution is usually found at the ng/L–level in drinking water sources or discharge water of wastewater treatment plants. In this study, a novel approach mediated by manganese oxidizing bacteria(Mn OB) in a biofilter was developed to control the pollution. The results indicated that the biogenic manganese oxide(Mn O x) produced during the oxidation of the feeding manganese ions could coat the surface of the filtering sand effecting the simultaneous removal of antibiotics. It was found that the removal of antibiotics is insured as long as the feeding manganese was well removed and was not influenced by the hydraulic loading. The growth rate of the Mn OB group revealed that the antibiotic concentration at 50 and 100 ng/L promoted their activity, but it was inhibited at 500 and 1000 ng/L. The structure of the bacterial community was stable in the presence of antibiotics(50 ng/L), but their extracellular processes changed. The removal performance of the feeding manganese seemed to relate to the extracellular processes of the dominant bacterial genus. Moreover, the freshly formed Mn O x was a buserite-like material that was rich in Mn(III) and Mn(IV)(94.1%), favoring the degradation. The biofilter did not generate additional antibiotic resistant genes in the presence of antibiotics.

关键词： Antibiotics Biofilter Manganese oxidizing bacteria Manganese oxide Metagenomic sequencing

Treating both wastewater and excess sludge with an innovative process

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2003年第6期15卷 749-756页

作者： HE Sheng-bing, WANG Bao-zhen, WANG Lin, JIANG Yi-feng (School of municipal & environmental engineering, Harbin Institute of Technology, Harbin 150090, China. School of municipal & environmental engineering Harbin Institute of Technology Harbin 150090 China

The innovative process consists of biological unit for wastewater treatment and ozonation unit for excess sludge treatment. An aerobic membrane bioreactor(MBR) was used to remove organics and nitrogen, and an anaerobic reactor was added to the biological unit for the release of phosphorus contained at aerobic sludge to enhance the removal of phosphorus. For the excess sludge produced in the MBR, which was fed to ozone contact column and reacted with ozone, then the ozonated sludge was returned to the MBR for further biological treatment. Experimental results showed that this process could remove organics, nitrogen and phosphorus efficiently, and the removals for COD, NH 3-N, TN and TP were 93.17%, 97.57%, 82.77% and 79.5%, respectively. Batch test indicated that the specific nitrification rate and specific denitrification rate of the MBR were 1.03 mg NH 3-N/(gMLSS·h) and 0.56 mg NOx-N/(gMLSS·h), and denitrification seems to be the rate-limiting step. Under the test conditions, the sludge concentration in the MBR was kept at 5000—6000 mg/L, and the wasted sludge was ozonated at an ozone dosage of 0.10 kgO 3/kgSS. During the experimental period of two months, no excess sludge was wasted, and a zero withdrawal of excess sludge was implemented. Through economic analysis, it was found that an additional ozonation operating cost for treatment of both wastewater and excess sludge was only 0.045 RMB Yuan(USD 0.0054)/m 3 wastewater.

关键词： wastewater treatment excess sludge aerobic membrane bioreactor(MBR) anaerobic reactor ozonation zero withdrawal of excess sludge

Diffraction of anti-plane SH waves by a semi-circular cylindrical hill with an inside concentric semi-circular tunnel

在线全文

学校读者我要写书评

暂无评论

Earthquake engineering and engineering Vibration 2004年第2期3卷 249-262页

作者： Vincent W.Lee 罗昊梁建文 dept.of Civil and environmental engineering Univ.of Southern CaliforniaLos AngelesCA 90089-2531USA Professor Civil engineering and Architecture Experiment Center Dept.of Civil EngineeringShanghai Jiaotong Univ.800 Dongchuan Rd.Shanghai 200240China Dept.of Civil EngineeringTianjin Univ.Tianjin 300072China Assistant Engineer dept.of Civil engineering Tianjin Univ.Tianjin 300072China Professor

A closed-form analytic solution of two-dimensional scattering and diffraction of plane SH waves by a semi- cylindrical hill with a semi-cylindrical concentric tunnel inside an elastic half-space is presented using the cylindrical wave functions expansion *** solution is reduced to solving a set of infinite linear algebraic *** expansion theorem with the form of complex exponential function and cosine function is *** solutions are obtained by truncation of the infinite *** accuracy of the presented numerical results is carefully verified.

关键词： SH waves hill tunnels close-form analytic solution amplifications

Natural continuous influent nitrifier immigration effects on nitrification and the microbial community of activated sludge systems

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2018年第12期30卷 159-167页

作者： Lifang Yu Ren Li Robert Delatolla Ru Zhang Xiuling Yang Dangcong Peng School of environmental and municipal engineering Xi'an University of Architecture and Technology Department of Civil engineering University of Ottawa

Two sequencing batch reactors（SBRs） were operated for 100 days under aerobic conditions,with one being fed with unsterilized municipal wastewater（USBR）, and the other fed with sterilized municipal wastewater（SSBR）. Respirometric assays and fluorescence in situ hybridization（FISH） results show that active nitrifiers were present in the unsterilized influent municipal wastewater. The maximum ammonia utilization rate（AUR） and nitrite utilization rate（NUR） of the unsterilized influent were 0.32 ± 0.12 mg NH4＋-N/（L·hr） and0.71 ± 0.18 mg NO2--N/（L·hr）. Based on the maximum utilization rates, the estimated seeding intensity for the ammonia oxidizing bacteria（AOB） and nitrite oxidizing bacteria（NOB） of the USBR was 0.08 g AOB/（g AOB·day） and 0.20 g NOB/（g NOB·day） respectively. The fraction of nitrifiers/total bacteria in the influent was 5.35% ± 2.1%, the dominant AOB was Nitrosomonas spp., Nitrosococcus mobilis hybridizated with Nsm156, and the dominant NOB was Nitrospira hybridizated with Ntspa662. The influent nitrifiers potentially seeded the activated sludge of the bioreactor and hence demonstrated a mitigation of the acclimatization times and instability during start-up and early operation. The AUR and NUR in the USBR was 15% and 13% higher than the SSBR respectively during the stable stage, FISH results showed that nitrifiers population especially the Nitrospira in the USBR was higher than that in the SSBR. These results indicate that the natural continuous immigration of nitrifiers from municipal influent streams may have some repercussions on the modeling and design of bioreactors.

关键词： Nitrifier immigration Influent wastewater Seeding effect Nitrification Nitrospira

Metabolites change of Scenedesmus obliquus exerted by AgNPs

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2019年第2期31卷 310-318页

作者： Pu Wang Bo Zhang Hui Zhang Yiliang He Choon Nam Ong Jun Yang School of environmental Science & engineering Shanghai Jiaotong University School of municipal and environmental engineering Lanzhou Jiaotong University NUS environmental Research Institute National University of Singapore

With increasing emission of silver nanoparticles(AgNPs) into the environment, it is important to understand the effects of ambient concentration of AgNPs. The biological effects of AgNPs on Scenedesmus obliquus, a ubiquitous freshwater microalgae, was evaluated. AgNPs exerted a minor inhibitory effect at low doses. Non-targeted metabolomic studies were conducted to understand and analyze the effect of AgNPs on algal cells from a molecular perspective. During the 48 hr of exposure to AgNPs, 30 metabolites were identified, of which nine had significant changes compared to the control group. These include D-galactose, sucrose, and *** carbohydrates are involved in the synthesis and repair of cell walls. Glycine, an important constituent amino acid of glutathione, increased with AgNP exposure concentration increasing, likely to counteract an increased intracellular oxidative stress. These results provide a new understanding of the toxicity effects and mechanism of AgNPs. These metabolites could be useful biomarkers for future research, employed in the early detection of environmental risk from AgNPs.

关键词： Silver nanoparticles (AgNPs) Scenedesmus obliquus Metabolomics Molecular mechanism

Nitrogen reduction using bioreactive thin-layer capping(BTC)with biozeolite: A field experiment in a eutrophic river

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2016年第4期28卷 119-125页

作者： Zhenming Zhou Tinglin Huang Baoling Yuan College of Civil engineering Huaqiao University School of environmental and municipal engineering Xi'an University of Architecture & Technology

Bioreactive thin-layer capping（BTC）with biozeolite provides a potential remediation design that can sustainably treat N contamination from sediment and overlying water in eutrophic water ***（N）reduction using BTC with biozeolite was examined in a field incubation experiment in a eutrophic river in Yangzhou,Jiangsu Province,*** biozeolite was zeolite with attached bacteria,including two isolated heterotrophic nitrifiers（Bacillus spp.）and two isolated aerobic denitrifiers（Acinetobacter spp.）.The results showed that the total nitrogen（TN）reduction efficiency of the overlying water by BTC with biozeolite（with thickness of about 2 mm）reached a maximum（56.69%）at day 34,and simultaneous heterotrophic nitrification and aerobic denitrification occurred in the BTC system until day *** was a significant difference in the TN concentrations of the overlying water between biozeolite capping and control（t-test;p〈0.05）.The biozeolite had very strong in situ bioregeneration *** was the main source of nitrifier ***,both dissolved oxygen（DO）and carbon concentrations affected denitrifier *** particular,DO concentrations greater than 3 mg/L inhibited denitrifier ***,BTC with biozeolite was found to be a feasible technique to reduce N in a eutrophic ***,it is necessary to further strengthen the adaptability of aerobic denitrifiers through changing domestication methods or conditions.

关键词： Bioreactive thin-layer capping (BTC) Simultaneous nitrification and denitrification (SND) Biozeolite Eutrophic river