Removal of organic matter and nitrogen from dairy effluents in a structured bed reactor operated with intermittent aeration.

The objective of this research was to evaluate the performance of a structured bed reactor (SBRIA), carried out with intermittent aeration (IA), in the removal of organic matter and nitrogen from dairy effluent, when run with different organic loading rates (OLR). The SBRIA was operated for 227 days, with 2:1 AI cycles (2 h with aeration on and 1 h off) and Hydraulic Retention Time (HRT) of 16 h. Three phases, with different OLR, were evaluated: phases A (1000 gCOD m day - 63 days), B (1400 gCOD m day - 94 days), and C (1800 gCOD m day - 70 days).

Aeration and non-aeration cycles (AE/NA) time: influence in combined organic matter and nitrogen removal and features of biofilm.

This research aimed the performance evaluation of a structured bed reactor with different cycles of Intermittent Aeration (IA)(SBRRIA) in the municipal sewage treatment and the verification of the effect of IA cycles on the total nitrogen (TN) removal and organic matter (COD). Three IA cycles were evaluated: phase I (4 h AE (aeration on) - 2 h NA (aeration off)); II (2 h AE-1 h NA) and III (2 h AE-2 h NA), with Hydraulic Retention Time of 16 h. The best nitrogen removal was obtained during phase II, with the lowest non-aeration time: efficiency of nitrification, denitrification, TN and COD removal of 80 ± 15%, 82 ± 12%, 67 ± 6% and 94 ± 7%, respectively.

Assessment of airborne particles and bioaerosols concentrations in a waste recycling environment in Brazil.

This study aims to assess the concentrations of size-fractioned particle mass (PM, PM, PM, PM) and number (PNC, PNC, PNC, PNC), bacteria, and fungi in a Materials Recycling Facility (MRF) in Brazil. The measurements were performed inside the waste processing shed (P1) and in the outdoor environment (P2) during working days in winter and spring of 2017, and summer of 2019. A total of 2,400 min of PM, 1,440 min of PNC, and 216 samples of bioaerosols were collected in the morning and afternoon.

Behçet's disease: external ear involvement.

Behçet's disease is an autoimmune vasculitis characterized by recurrent episodes of oral and genital ulcerations, skin lesions and uveitis. It also affects neurological, vascular, articular and gastrointestinal systems. Although etiology and pathogenesis are under investigation, studies have shown that HLA-B51 influences genetic susceptibility.