Constructed wetlands might be an alternative for communities away from urban centers and not served by a domestic wastewater treatment system. The purpose of this study was to provide instructions for the implementation of subsurface flow constructed wetland systems. To that end, we gathered information regarding the construction aspect, plants, and operational parameters used in systems which already operate in the country and the respective efficiency of these sets after previous treatment. The system in real scale proposed by Oliveira et al. (2005) was prominent among those that presented the highest efficiency. It was preceded by upflow anaerobic reactor built in brick, with macrophyte of the Typha genre, crushed stone at the entry and exit of the system, and sand in its intermediate portion. It required 1.04 m² surface area per inhabitant in humid temperate climate and hot summer, 1.71 m³ d-1 flow, and one-day hydraulic detention. The considerations presented here might help the construction of this kind of system, regarding dimensional and operational criteria.

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Agroindustries are major consumers of water. However, to adapt to environmental trends and be competitive in the market, they have sought rational use of water through water management in their activities. Cleaner Production can result in economic, environmental and social benefits, and in actions that promote reduction in water consumption. This case study was conducted in a slaughterhouse and poultry cold storage processing plant and aimed to identify points of excessive water consumption, and to propose alternatives for managing water resources by reducing consumption. Consumption data are presented in relation to the processing stages with alternatives proposed for the rational use of water, such as closure of mains water during shift changes. Following the implementation of recommendations, a reduction in water consumption of approximately 11,137 m 3 per month was obtained, which equates to a savings of US$ 99,672 per year. From this study, it was concluded that the company under review could develop various improvement actions and make an important contribution to the preservation of water resources in the region where it operates. KEYWORDS:Water consumption, cleaner production, poultry processing. USO RACIONAL DE ÁGUA EM UM ABATEDOURO DE FRANGO NO ESTADO DO PARANÁ, BRASIL: UM ESTUDO DE CASO RESUMO:As agroindústrias são as maiores consumidoras de água. Entretanto, para se adaptarem às tendências ambientais e manterem-se competitivas no mercado, elas têm que trabalhar com o uso racional da água através da gestão hídrica em suas atividades. A Produção Mais Limpa pode possibilitar benefícios econômicos, ambientais e sociais, incluindo ações que promovam a redução no consumo de água. Este estudo de caso foi conduzido em um frigorífico de frango e teve por objetivo identificar pontos de consumo excessivo de água e propor alternativas de gestão das fontes de água através da redução do consumo. Os dados de consumo de água aqui apresentados estão relacionados às etapas de processo, com ênfase nas alternativas de uso racional da água, como fechamento das torneiras durante as trocas de turno. O uso das medidas propostas possibilitou a redução no consumo de água de, aproximadamente, 11.137 m 3 por mês, o que equivale a uma economia de US$ 99.672 por ano. A partir deste estudo, foi possível verificar que a empresa em questão pode desenvolver ações simples que resultam em importantes contribuições para a preservação das fontes de água na região onde está inserida. PALAVRAS-CHAVE:Consumo de água, produção mais limpa, processamento de frango.

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