Tropical production of tilapia (Sarotherodon aurea) and tomatoes (Lycopersicon esculentum) in a small-scale recirculating water system

Aquaculture ◽  
1984 ◽  
Vol 41 (3) ◽  
pp. 271-283 ◽  
Author(s):  
Barnaby J. Watten ◽  
Robert L. Busch
Keyword(s):  
Lycopersicon Esculentum ◽  
Water System ◽  
Small Scale ◽  
Recirculating Water System

scholarly journals Effect of different maturation diets on reproductive performance of the broodstock of purple mangrove crab, Scylla tranquebarica

2017 ◽  
Author(s):  
Fui Yin Thien ◽  
Annita Seok Kian Yong
Keyword(s):  
Reproductive Performance ◽  
Gonadosomatic Index ◽  
Water System ◽  
Natural Food ◽  
Hatching Rate ◽  
Initial Body Weight ◽  
Control Female ◽  
Formulated Diets ◽  
Mangrove Crab ◽  
Recirculating Water System

The present study was aimed at evaluating the reproductive performance of the broodstock of purple mangrove crab (Scylla tranquebarica) fed natural food and formulated diets supplemented with astaxanthin and/or DHA. Formulated diets were supplemented with 500 mg kg-1 of astaxanthin (FA), 10 g kg-1 of DHA (FD) and both astaxanthin and DHA (FA+D). Diet without astaxanthin and DHA (FCon) and natural food (NF) consisted of forage fish (Valamugil sp.), shrimp (Penaeid sp.) and mangrove clam (Polymesoda sp.) to serve as control. Female broodstock of initial body weight 129.07±17.03 g were stocked in HDPE tank and cultured under recirculating water system. Broodstock maturation was monitored until spawning. Reproductive performance of female and condition of the larvae were also evaluated. After 50 weeks, broodstock fed FA+D diet showed better maturation percentage, spawning rate, gonadosomatic index, oocytes diameter, molting, molt death syndrome and survival rate than FCon group (P0.05) to the FA+D group but diet FD resulted in better performance than FA. Broodstock fed FA+D diet had the highest hatching rate, number of larvae produced and significantly higher zoea II survival compared to FCon and NF groups (P

scholarly journals An Interdisciplinary Approach to the Sustainability of a Gravity-Fed Water System in the Peruvian Andes

2019 ◽  
Vol 14 (3) ◽  
pp. 49-60
Author(s):  
Riley Orabona Wagner ◽  
Sydney Hsu ◽  
John Nicholas Kick ◽  
Sofia Bisogno ◽  
Camille Heubner ◽  
...  
Keyword(s):  
Water System ◽  
Interdisciplinary Approach ◽  
Design Parameters ◽  
Small Scale ◽  
Development Projects ◽  
Peruvian Andes ◽  
Princeton University ◽  
Future Success ◽  
Local Partnerships ◽  
Engineers Without Borders

This paper analyzes the methods utilized by the Princeton University Chapter of Engineers Without Borders to ensure the sustainability of a gravity-fed water system in rural northwestern Peru. While similar small scale development projects consider sustainability in their design process, some do not recognize the importance of an interdisciplinary approach to sustainability. This team, however, is inherently interdisciplinary in nature due to its unique subteam structure, which subsequently affects its approach to sustainability. By examining the technical, social, and financial considerations of the project conducted by the Princeton University Chapter of Engineers Without Borders, this paper argues for a three-pronged approach to sustainability. As can be seen through thoughtful design parameters, strong local partnerships, and strategic financial mechanisms, the project displays promise of future success with regards to sustainability. The main objective of the Princeton Chapter of Engineers Without Borders in this partnership is to ensure that the community has the knowledge, tools, and resources necessary to maintain the water system in a self-sufficient manner at the completion of the chapter’s involvement.

scholarly journals Ozonated water in the post-harvest treatment of coffee fruits

2016 ◽  
Vol 20 (9) ◽  
pp. 862-866 ◽  
Author(s):  
Fernando J. B. Brandão ◽  
Marco A. M. Biaggioni ◽  
Felipe C. S. Sperotto ◽  
Erika Fujita ◽  
Paula L. Santos ◽  
...  
Keyword(s):  
Sensory Quality ◽  
Reducing Sugars ◽  
Water System ◽  
Quality Analysis ◽  
Partial Reduction ◽  
Negative Results ◽  
Constant Rate ◽  
Recirculating Water System ◽  
Ozonated Water

ABSTRACT Ozone is used in many countries for the treatment of effluents, becoming a viable alternative in sanitation of coffee wastewater. However, the strong ozone oxidation, responsible for its germicidal effect, can also compromise grain and beverage quality. The objective of this study was to evaluate the quality of Arabica coffee in different periods of treatment with ozonated water and its effect after drying. Coffee fruits were subjected to ozonation at regular intervals of 0, 5, 10, 20, and 30 min, with continuous stirring promoted by a recirculating water system at constant rate of 1 ppm of solubilized ozone. The design was completely randomized with five treatments and four replicates. After obtaining the data, the analysis of variance was performed and means were compared by Tukey test (p ≤ 0.05). The results showed a partial reduction of fungi after washing with ozonated water, but the same effect was not observed after drying. For coffee quality analysis, the longest times of exposure to the solubilized gas in the water produced some negative results in electrical conductivity and total and reducing sugars. However, the sensory quality of the beverage was maintained.

scholarly journals Mobile crowd participation to root small-scale piped water supply systems in India and Bangladesh

2019 ◽  
Vol 9 (1) ◽  
pp. 139-151 ◽  
Author(s):  
A. Mink ◽  
B. A. Hoque ◽  
S. Khanam ◽  
D. Van Halem
Keyword(s):  
Water Supply ◽  
Water System ◽  
Internet Access ◽  
Water Quality Monitoring ◽  
Small Scale ◽  
Water Supply Systems ◽  
Smartphone Applications ◽  
Piped Water ◽  
Supply Systems ◽  
Mobile Crowd

Abstract In the arsenic-contaminated Ganges-Brahmaputra-Meghna Delta in India and Bangladesh, small-scale piped water supply seems a promising way to provide safe drinking water to households in the region. The use of smartphone applications can support monitoring of the system and enhance local engagement and empowerment. In this paper the scope for mobile crowd participation as a research and monitoring tool for piped water supply systems in Bihar, India and in Khulna and Chittagong, Bangladesh is investigated. In these areas, the use of smartphones and internet access are growing rapidly and smartphone applications would enable real-time water quality monitoring, payment of water bills, awareness creation, and a dialogue between the end-user and the water supplier. To identify the relevance and acceptability of piped water supply and smartphone monitoring, four surveys with potential end-users were conducted. Based on these surveys we conclude that in the investigated areas there is a desire for piped water systems, that households already own smartphones with internet access, and that there is an interest in smartphone monitoring. The enabling environment to deploy mobile crowd participation for piped water system monitoring stimulates further research towards an investigation of potential functionalities and the actual development of such an application.

scholarly journals VAZÃO E TRATAMENTO SECUNDÁRIO DE ESGOTO DOMÉSTICO EM ESTAÇÃO DE PEQUENO PORTE COM SISTEMA DE ZONA DE RAÍZES

Irriga ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 62-71
Author(s):  
Ana Cláudia Oliveira Sérvulo ◽  
Jeane Da Silva Tavares ◽  
Rodrigo Moura Pereira ◽  
Delvio Sandri
Keyword(s):  
Root Zone ◽  
Potential Evapotranspiration ◽  
Low Cost ◽  
Treatment Plant ◽  
Water System ◽  
Free Water ◽  
Small Scale ◽  
Treatment Wetland ◽  
Cyperus Giganteus ◽  
E Mail

VAZÃO E TRATAMENTO SECUNDÁRIO DE ESGOTO DOMÉSTICO EM ESTAÇÃO DE PEQUENO PORTE COM SISTEMA DE ZONA DE RAÍZES     ANA CLÁUDIA OLIVEIRA SÉRVULO1; JEANE DA SILVA TAVARES2RODRIGO MOURA PEREIRA3E DELVIO SANDRI4   1Doutoranda, Programa de Pós Graduação em Agronomia, Universidade de Brasília (UnB),Faculdade de Agronomia e Medicina Veterinária (FAV), Campus Universitário Darcy Ribeiro, ICC Centro,Asa Norte CEP 70.910-900 – Brasília, Brasil, e-mail: [email protected]. 2Aluna de graduação, Universidade de Brasília (UnB),Faculdade de Agronomia e Medicina Veterinária (FAV), Campus Universitário Darcy Ribeiro, ICC Centro,Asa Norte CEP 70.910-900 – Brasília, Brasil, e-mail:[email protected]. 3Doutorando, Universidade de Brasília (UnB),Faculdade de Agronomia e Medicina Veterinária (FAV), Campus Universitário Darcy Ribeiro, ICC Centro,Asa Norte CEP 70.910-900 – Brasília, Brasil, e-mail: [email protected]. 4Prof. Associado 1, Universidade de Brasília (UnB),Faculdade de Agronomia e Medicina Veterinária (FAV), Campus Universitário Darcy Ribeiro, ICC Centro,Asa Norte CEP 70.910-900 – Brasília, Brasil, e-mail: [email protected].     1 RESUMO   O sistema de zona de raízes (SZR) é uma alternativa para tratamento de esgotos, cuja eficiência depende do material de suporte, composição do esgoto, espécie de macrófita e tempo de detenção hidráulica (TDH). Objetivou-se avaliar a medição de vazões de afluente e efluente de esgoto dos SZR com o uso de hidrômetro e método direto volumétrico(MDV) e a eficiência de diferentes espécies de macrófitas na remoção de atributos físicos e químicos do efluente. O esgoto bruto é gerado nos sanitários e restaurante universitário da Fazenda Água Limpa -UnB. Quatro leitos de tratamento foram utilizados: não cultivado, SZR com C. giganteus, Typha sppe H. rostrata. As avaliações ocorreram em quatro dias distintos. A evapotranspiração potencial (ETP) dos leitos foi obtida pela razão entre a diferença de volumes de afluente e efluente e a área superficial dos leitos. O hidrômetro não foi adequado na medida do volume de afluente, recomendando-se o MDV. A maior ETP ocorreu no SZR com Typha spp (9,98 mm dia-1)seguido do C. giganteus(9,37 mm dia-1).O maior valor de TDH foi de 9,49 dias e o menor de 4,68 dias. O oxigênio dissolvido, pH, turbidez e sólidos totais atendem aos limites para lançamento em corpos hídricos de classe 2.   Palavras-chaves: macrófita, água residuária, leito cultivado.     SÉRVULO, A.C.O.; TAVARES, J.S.; PEREIRA, R.M.; SANDRI, D. FLOW RATES AND SECONDARY TREATMENT OF WASTEWATER IN SMALL-SCALE TREATMENT PLANT WITH ROOT ZONE SYSTEM     2 ABSTRACT   The root treatment wetland (RTW) is a low cost option to wastewater treatment, which efficiency depends on support material, wastewater composition, macrophyte specie and hydraulic detention time (HDT). This paper aimed to test the performance of the hydrometer and the volumetric method (VM)on measurement of effluentflow, and the removal efficiency of different macrophyte species over physical and chemical effluent attributes. The wastewater was from the bathrooms and restaurant in the experimental farm of the University of Brasília. Four constructed wetlands were used: free water system (FWS), RTW with Cyperus giganteus, with Typha spp and with Heliconia rostrata. The evaluation occurred in four days isolated. The systems’ potential evapotranspiration (PET) was determinate by the quocient of affluent-effluent volumes balance and the wetland surface area. The hydrometer didn’t measure affluent flow properly, recommending the VM. The highest PET was on RTW-Typha spp (9.98 mm day-1), followed by C. giganteus (9.37 mm day-1). The highest HDT was 9,49 days and the lowest was 4.68 days. The dissolved oxygen, pH, turbidity and total solids content are fit the Brazilian legal requirements for release into class 2 receiving bodies.   Keywords: macrophytes, sewage, wetland.

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