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Influence of Salinity on Duckweed Growth and Duckweed Based Wastewater Treatment System

Journal of Water Resource and Protection 2013年第10期5卷 993-999页

作者： sena peace hounkpe wendeou Martin Pepin Aina Martin Crapper Edmond Adjovi Daouda Mama Civil Engineering Department Université d’Abomey-Calavi Cotonou Benin Faculy of Science and Technology Université d’Abomey-Calavi Cotonou Benin School of Engineering The University of Edinburgh Edinburgh UK

The growth of duckweed (Spirodela polyrrhiza) was investigated in an outdoor batch system under 15 different conductivities ranging from 200 μS/cm to 3000 μS/cm with average 110 μmol/m2 daylight intensity. The growth was performed in an anaerobically treated domestic wastewater using an initial plants population of 50 fronds. Increase in Relative Growth Rate—RGR—(in terms of fresh weight and number of fronds) had a significant non-linear (polynomial) relationship with the conductivity. The maximum RGR related to fresh weight of 0.176 was observed at the conductiviity of 1200 μS/cm while the maximum RGR related to fronds number was 0.193 at the conductivity of 800 μS/cm. The optimum range for duckweeds growth was found to be between conductivities of 600 μS/cm and 1400 μS/cm. The maximal rates of removal of COD of 14.5 mg/day, of 0.65 mg/day, NTK of 15.68 mg/day, faecal coliforms of 100% and turbidity of 80.8% were observed in this range. The COD and PO42- removal rates were highly correlated to the growth rate, with the correlation factor of up to 0.783 and, then to the conductivity. The NTK reduction was positively related to the conductivity.

关键词： Duckweed S. polyrrhiza Growth Rate Conductivity Domestic Wastewater

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Wastewater Management in Third World Cities: Case Study of Cotonou, Benin

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Journal of Environmental Protection 2014年第5期5卷 387-399页

作者： sena peace hounkpe Edmond Codjo Adjovi Martin Crapper Esi Awuah Civil Engineering Department Université d’Abomey-Calavi Cotonou Benin Department of Civil Engineering Kwame Nkrumah University of Science and Technology Kumasi Ghana School of Engineering The University of Edinburgh Edinburgh UK

Poor wastewater management coupled with lack of sanitation facilities has aggravated the sanitation challenges in developing countries.?This study was aimed at providing information on the current state of sanitation in Cotonou City through surveys. The most common sanitation facilities in the city were septic tanks, latrines and soakaway pits. Mechanical desulging was mainly used (94%) for desludging latrines and septic tanks with a frequency of less than once a year for 73% of the houses;manual desludging was most common for soakaway pits. 84% of sullage generated is disposed without treatment. The only existing stabilization pond plant, managed by a private company SIBEAU, is overloaded;the effluent is poor (up to 2250mg/l BOD5) and does not meet any quality standards. 96% of survey respondents recognise that the sanitation situation in the city is not good;it has to be improved by providing an appropriate and sustainable sanitation management system.

关键词： Urban Sanitation Septic tanks Soakaway Pits Latrines Desludging Wastewater Treatment Developing World Cities

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Changing Mechanicals Characteristiques of Cementitious Materials Using Titanium Dioxide

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Materials Sciences and Applications 2021年第6期12卷 297-313页

作者： Valéry Kouandété Doko sena peace hounkpe Smith Oyebissi Kotchoni Li Hui Abbas Tiambo Datchossa Laboratory of Applied Energetics and Mechanics (LAEM) EPAC UAC Cotonou Benin Loboratory of Water Technical Sciences UAC Cotonou Benin Harbin Institute of Technology Harbin China

Since many years ago, the substitution of cement by other cementitious supplementary elements has being a purpose for many researchers. This is to reduce the impact of producing cement on our environment. In this article, we are interested in the possibility of substituting cement with titanium dioxide and titanium dioxide + fly ash. To achieve this purpose, we have manufactured mortars and cement pastes specimens with different rates of replacement of cement by titanium dioxide (0%, 0.1%, 1%) on the one hand and titanium dioxide + fly ash on the overhand. The flexural and compressive strength of each specimen has been determined.

关键词： Silicates Flexural Strength Compressive Strength Cement Titanium Dioxide

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Carbon Nanotubes and Resistance to Freeze-Thaw Cycles

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Materials Sciences and Applications 2021年第5期12卷 239-254页

作者： sena peace hounkpe Valéry K. Doko Smith O. Kotchoni Hui Li Abbas T. Datchossa Laboratory of Water Technical Sciences UAC Cotonou Benin Laboratory of Applied Energetics and Mechanics (LAEM) EPAC UAC Cotonou Benin Harbin Institute of Technology Harbin China

The research of materials with good properties is one of the important concerns of scientists groups, and more again in region where materials are subjected to freeze and thaw cycles. In the case of this paper, it has been a matter of evaluating of the effect of carbon nanotubes on concrete resistance to freeze and thaw cycles. Thus, it has been manufactured concretes with different rates of addition (0%, 0.1%, 0.5%, 1% bwc) of cement by carbon nanotubes. The durability factor, determined for C30 specimens at 28 days, shows that C005 provides a better resistance to freezing-thawing cycles with a 54.96 as index.

关键词： Silicates Flexural Strength Compressive Strength Cement Carbon Nanotubes Freeze-Thaw Cycles

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