Estudo sobre a eficiência de coagulantes de tratamento de efluentes utilizados em uma estação de tratamento de efluente em bioreator de membrana (MBR)

Abstract

Study carried out in a membrane bioreactor treatment plant on the efficiency of coagulants and flocculants for effluent treatment, verifying the average consumption of the suppliers Buschle & Lepper, Nalco and Veolia in milliliters of coagulants, flocculants (concentration of 0.2%) and sodium hydroxide per liter of raw effluent. The tests were divided into three combinations of chemistries, the first being Buschle & Lepper and Nalco, the second only Veolia and the third Buschle & Lepper and Veolia. The Bioreactor membrane treatment plant (MBR) has two flocculation treatments, a primary one with coagulant chemicals, pH adjustment with soda and flocculant that produces a physicochemical sludge, and a secondary treatment with only flocculants that produces a biological sludge from the activated sludge. The focus of the research was primary treatment. The quantitative efficiency analyses used the COD methodology USEPA Reactor Digestion Method (Method 8000), suspended solids Suspended Solids (Photometric Method) and data treatment by mean and standard deviation of chemical consumption. After evaluating all the parameters, Veolia was more efficient. Thus, the results of an average COD reduction of 35.24%, a reduction of 96.07% in Veolia's TSS showed the best performances, in addition to lower intakes of coagulant, flocculant and sodium hydroxide.