Reúso de efluente de esgoto sanitário anaeróbio e nitrificado em irrigação de roseiras / Reuse of anaerobic and nitrified wastewater effluents for irrigation of roses

AUTOR(ES)
DATA DE PUBLICAÇÃO

2011

RESUMO

Wastewater secondary treatment plants effluent may contain, yet, nutrients in amounts harmful to the environment. These effluents discharging can cause eutrophication in receiving waters, making it unsuitable for intended uses, such as provision for human consumption, leisure activities, etc. Besides the problem of eutrophication, there is the difficulty to make it appropriate to patterns recommended by resolution nº 357, 2005 from National Council on the Environment - CONAMA - which establish the quality standards for receiving waters about nitrogen and phosphorus concentration. Thus, a way to decrease the influx of nutrients to receiving waters would be agricultural reuse, which still leads savings in fertilizer use. But treated wastewater reuse in irrigation can bring some problems, including salinity and sodicity in soil and nitrate excess in soil solution. Therefore, it is necessary soil chemical characteristics monitoring of the irrigated area. So, the aim of this study was to evaluate the feasibility of drip irrigation of roses with anaerobic and nitrified wastewater effluents, analyzing the degree of salinity and sodicity of the soil, content of nitrate and potassium in the soil solution, yield of the crop and parameters of the flowers in comparison to traditional cultivation with fertilizer and freshwater irrigation. The highest production was in the nitrified effluent treatmen, that was 15,000 dozen ha-1. There was no statistical difference among treatment in flowers´parameters (stem diameter and length, bud length and diameter, fresh button mass). Electrical conductivity in saturation extract of soil was 0.69 dS m-1 in anaerobic effluent with fertilization treatment. Maximum SAR was 5.65 (mmolc L-1) in nitrified effluent treatment. Concentration of NO3-N in all treatments was around 20 mg L-1. The application of treated effluent in roses is shown to be viable

ASSUNTO(S)

Água - reutilização Águas residuais no solo macronutrientes water wastewater into the soil macronutrients

ACESSO AO ARTIGO

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