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Agronomic Requirements for Soil Utilization in Liquid Waste Disposal Systems – The Case of Sitel

1987; Pergamon Press; Volume: 19; Issue: 8 Linguagem: Inglês

10.2166/wst.1987.0056

1996-9732

Zeno Simon, Marino José Tedesco,

Soil Management and Crop Yield

At SITEL – the integrated effluent treatment system of Pólo Petroquímico do Sul (South Petrochemical Complex), Triunfo, State of Rio Grande do Sul, Brazil – both the final effluent and the thickened excess activated sludge are disposed of on land. Thorough agronomic investigations made possible the identification of appropriate soils for receiving the wastes and the establishment of some design criteria. Profile depth, texture, infiltration rate, internal drainage, slope and availability of land covered with intact vegetation were the main factors considered in the election of areas for effluent disposal. For sludge application the following factors were taken into account: drainage, slope, chemical characteristics (mainly pH and Organic Matter), distance to the sludge loading point, suitability to agronomic management, ease of access, topography and presence of an adequate grass species (pangola grass). The results of the preliminary agronomic investigations are presented and discussed. Design assumptions are confronted with actual operational data. Comparisons are made with other reported situations. A discussion on the limitations, shortcomings and incompleteness of the available criteria and guidelines is included, with particular focus on CEC, Infiltration Rates, Maximum Permissible Loadings, Nitrogen and Organic Matter.