Minimização de afluentes e avaliação de sistema biológico de tratamento de águas residuárias em uma indústria de conservas vegetais

Abstract

The addition a chemical surfactant in the sodium hydroxide solution was evaluated in the peach peeling process. The results were compared to the traditional process, without chemical addition. It could be observed reduction from 57.14% in the sodium hydroxide consumption, 49.18% in wastewater generation of the fruit washing process and 42.81%, 16.02%, 45.45%, 24.16% and 31.82%, in the loads of chemical oxygen demand (COD), biochemical oxygen demand (BOD), total Kjeldahl nitrogen (TKN), total suspended solids (TSS) and the settleable solids (SS), respectively. The fruit-cannery wastewaters must be treated. There are several processes that can be used for the removal of materials and chemicals that can degrade the environment. An upflow anaerobic sludge blanket (UASB) of a cannery industry (fruits and vegetables) was evaluated. The system was assessed for 712 days and the efficiency of total DQO removal was evaluated. The start-up began with a mean organic loading rate (OLR) of 0.40kgDQO.m-3.d-1, and achieved a maximum OLR of 5.29kgDQO.m-3.d-1 in 307 days. The mean removal of total DQO was 86.87%. This study showed that even with the seasonality of production, the UASB reactor is a good alternative for the secondary treatment of fruit-cannery industry