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This study investigates the impact of wastewater treatment plant (WWTP) effluent on the toxicity of the recipient water body and the effectiveness of the disinfection treatment applied (sodium hypochloride) to assure the compliance of both microbiological and toxicological emission limits. No toxicity was found in the majority of samples collected from the recipient river, upstream and downstream of the WWTP, using three different toxicity tests (Vibrio fischeri, Daphnia magna, and Pseudokirchneriella subcapitata). Only three samples presented toxic unit (TU) values with V. fischeri, and one presented TU with P. subcapitata. The influent toxicity ranged from slightly toxic to toxic (TU = 0.68-4.47) with V. fischeri, while only three samples presented TU values with the other tests. No toxicity was found in the absence of chlorination, while the mean toxicity was 3.42 ± 4.12 TU with chlorination in the effluent. Although no toxicity or very slight toxicity was found in the receiving water, its residual toxicity was higher than the US EPA Quality Standard in two samples. Escherichia coli concentration had a lower mean value in the chlorinated effluent: 13,993 ± 12,037 CFU/100 mL vs. 62,857 ± 80,526 CFU/100 mL for the not chlorinated effluent. This difference was shown to be significant (p < 0.05). E. coli in ten chlorinated samples was higher than the limit established by European and Italian Legislation. The mean highest trihalomethanes (THMs) value was found in the influent samples (2.79 ± 1.40 μg/L), while the mean highest disinfection by-products (DBPs) was found in the effluent samples (1.85 ± 2.25 μg/L). Significant correlations were found between toxicity, sodium hypochlorite, THMs, DBPs, E. coli, and residual chlorine. In conclusion, this study highlighted that the disinfection of wastewater effluents with sodium hypochlorite determines the increase of the toxicity, and sometimes is not enough to control the E. coli contamination.

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<div><strong>RESUMO</strong></div><p>Esta pesquisa procura analisar o potencial interativo e participativo das páginas de campanha no Facebook de candidatos à Câmara dos Deputados nas eleições de 2014 no Brasil. Para tanto, é objeto específico deste trabalho observar o conteúdo publicado nas fanpages de oito candidatos à reeleição para deputado federal pelo Rio de Janeiro durante os 30 últimos dias de propaganda eleitoral na web, de 1 de setembro a 3 de outubro de 2014. Com base em métodos qualitativos e quantitativos aplicados sobre as 840 publicações coletadas nos oito perfis, ficou claro observar que: a) não parece haver relação entre a incidência de postagens e número de ações de interação alcançadas; b) parece haver relações significativas entre os temas "plataforma de campanha" e "registro de atividades" com o número de compartilhamentos e comentários.</p><p> </p><p><strong>ABSTRACT</strong></p><p>This research aims to analyze the potential of interaction and participation of citizens with politicians in campaign for the Brazil's Chamber of Deputies in the country's 2014 elections on their official Facebook fanpages. For this, it observed all the posts made by eight candidates for re-election as a federal deputy for Rio de Janeiro during the last 30 days of the campaign. Based on qualitative and quantitative methods applied on 840 publications, collected in 8 different profiles, it was observed that: a) it seems that there is no relationship between the incidence of posts and the number of interactive activities achieved; b) It seems that there is a relation between “campaign platform” and “activity log" posts and the possibility of shares and comments.</p>