ANÁLISE DE UM EFLUENTE DE ESGOTO TRATADO E SEU EFEITO EM PROPRIEDADES QUÍMICAS DE UM NEOSSOLO QUARTZARÊNICO

Abstract

A treated sewage effluent was initially analyzed and after that an experiment was carried out to evaluate the effects of the irrigation using this effluent on some chemical properties of a Typic Quartzipsamment soil, in a greenhouse. The experiment was accomplished in a completely randomized design with two treatments and ten replications. The treatments consisted of applying normal water and treated sewage effluent in twenty experimental units (plastic bags with capacity of 2 L). Soil samples from experimental units, collected before and after experiment, tap water and treated sewage effluent samples were chemically analyzed. Results indicated that treated sewage effluent can be used for crop irrigation. When compared to water, irrigation with treated sewage effluent produced in the soil, under the study conditions: a) increase in the P and organicmatter contents in the soil; b) increase in the sodium contents, exchangeable sodium percentage and, consequently, in the soil pH; and c) increase on the sum of exchangeable basis and on the exchangeable cationic capacity.