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Behaviour of Roofing Materials Facing to micro-organisms

Green and Sustainable Chemistry 2013年第1期3卷 8-14页

作者： Marielle Fassier Céline Faugeron Vincent Gloaguen Céline Ducroquetz Olivier Dupont Centre Technique de Matériaux Naturels de Construction Paris France Laboratoire de Chimie des Substances Naturelles Limoges France

An accelerated water-streaming test was used to evaluate several roofing materials regarding their behavior to colonization by algae, by closely reproducing the phenomenon of natural biological soiling. A set of roofing materials with defined physical and chemical characteristics was thus investigated against the colonization by algae. Porosity, roughness and chemical composition showed to be factors of influence in the establishment of those micro-organisms.

关键词： Building Materials Fired Clay Products Water-Streaming Test micro-organisms Colonization

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Longitudinal dispersion of micro-organisms in a turbulent open-channel flow

Longitudinal dispersion of micro-organisms in a turbulent op...

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第十六届全国水动力学学术会议暨第三十二届全国水动力学研...

作者： YANG Fang-yu CHEN Xiao GUAN Ming-yang YANG Yu CHEN Bin ZENG Li State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower Research Development Research Center of the Ministry of Water Resources of P.R.China College of Engineering Peking University State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal University

The longitudinal dispersion of micro-organisms in a turbulent open-channel flow is significant for understanding various ecological phenomena associated with the water conveyance process in an open *** paper analyses micro-organisms migration in a fully developed open-channel flow with the logarithmic velocity *** migration velocity and longitudinal dispersivity of a micro-organisms cloud are analyzed based on Aris’ concentration moment *** show that the strong swimming velocity can result in the non-monotonous variation of longitudinal dispersion coefficient and velocity of centred motion during the initial stage,enhance the centred motion,and weaken the longitudinal dispersion of micro-organisms during the stable *** concentration distribution of micro-organisms concentration is illustrated and analyzed using the Edgeworth *** strong cell swimming in the vertical direction can accumulate micro-organisms near the free-water surface,while the weak cell swimming tends to make uniform distribution across the channel.

关键词： Longitudinal dispersion Turbulent flow micro-organisms

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Sustainable Bio-Conversion of Rice Straw Waste into High Quality Organic Fertilizer

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Journal of Environmental Protection 2020年第4期11卷 315-331页

作者： Hala M. Omar Yahia I. Mahmoud Salah M. El-Haggar Department of Mechanical Engineering The American University in Cairo Cairo Egypt Soil microbiology Department Soil Water and Environment Research Institute Agriculture Research Center Ministry of Agriculture Giza Egypt

The aim of this study is to investigate the effect of different additives including biochar, effective micro-organisms (EM), animal manure and commercial microbial inoculants on the bioconversion of rice straw. Different compost piles were constructed, and each contained 50 kg of rice straw and mixture of natural rocks to enrich the compost nutritional value. The physical, chemical and biological parameters indicating the decomposition of organic material, maturation and quality of the organic fertilizer product were investigated during the composting process. A rapid increase in compost temperature was obtained in inoculated piles. All piles reached maturation after around 42 days. All analysis of the properties of the final compost products indicated that it was in the range of the matured level and can be used as organic fertilizer without limitation. The highest decomposition rate and highest organic fertilizer quality were obtained in the pile inoculated with EM and 10% biochar compared to other treatments.

关键词： Biochar Effective micro-organisms Organic Fertilizer Rice Straw

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Treatment of 10t/h Ballast Water in Oceanic Ships Using hydroxyl radical（·OH） Based on Strong Electric-Field Discharge

Treatment of 10t/h Ballast Water in Oceanic Ships Using hydr...

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中国物理学会第十八届全国静电学术会议

作者： CHEN Cao MENG Xiang-ying BAI Min-dong SUN Jian MENG Fan-peng Institute of Marine Engineering Department of Physics Dalian Maritime University College of Environment and Ecology Xiamen University

In this paper, we described a new type of ship ballast water treatment system using hydroxyl radical（·OH）.With physical methods of strong electric field ionization discharge at atmospheric pressure, we used O2 in air and sea H2O（gaseous） ionization, dissociation to a number of oxygen active particles（ROS） such as ·OH, O2+, O2ˉ, O3, H2O+, H2O2 and HO2·, ect, in which ·OH is the main active particle. Through the venturi ·OH was injected into ballast water treatment system, forming a high concentration of ·OH solution which was used to kill the harmful micro-organisms in ballast *** paper presented that single-cell algae with the concentration of 1.12×104 cell ml-1and bacteria with the concentration of 1.95×104 cfu ml-1 were treated by the ·OH solution with the concentration of 2.2 ppm. Death rate could reach almost 100%. The micro-organisms did not reactivate at 48 h and 120 h, respectively. After treatment, the concentration of malondialdehyde（MDA） had obviously growth. BOD and COD decreased *** results indicate that high concentration of ·OH solution has a significant effect on killing algae and bacteria. It can be proved by studying Lipid peroxidation. At the meantime, it has no side effects on seawater and will be a promising method for the treatment of ballast water. The results reach the requirements of Regulation D-2 of International Convention for the Control and Management of Ships’ Ballast Water and Sediments completely.

关键词： strong electric-field discharge hydroxyl radical(·OH) micro-organisms killing malondialdehyde(MDA) water quality

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