AVALIAÇÃO DA EFICIÊNCIA DAS VÁRIAS FASES DE UM SISTEMA DE TRATAMENTO DE EFLUENTES

Abstract

The treatment of the wastewater can be processed by either physical-chemical and or biological methods. Biological methods in turn can be divided into aerobic and anaerobic. The utilization anything process usually have for objective to remove the organ matter and, the performance is variable depending on the device utilized. The purpose of the present work is to evaluate the treatment wastewater system with primary, secondary and auxiliary treatments. The primary treatment consists of a dispositive that blockade bulky materials and the sand excluder for removing the inert materials. The secondary, responsible for the organic charge elimination is realized by up flow of an anaerobic sludge mantle filter. The auxiliary treatment is a polishing pond. The evaluation was made through the determination of pH, Consumed Oxygen (CO/COD), Biochemical Oxygen Demand (BOD), COD/BOD relation, alkalinity, volatile fatty acids (VFA), total nitrogen, ammonium, nitrate, total phosphorus, turbidity and settable solids determination. The results showed that the biological process used is appropriate given that the ratio COD / BOD is less than 2.5, the system was capable of removing organic matter in terms of OC and BOD at the rates of 43.1 % and 44.8 % respectively when the concentration of total phosphorus in polishing pond is high, which can cause eutrophication.