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Os estrogênios são micropoluentes capazes de causar alterações no sistema endócrino de organismos aquáticos. Uma das principais fontes da sua introdução no meio hídrico é através do lançamento de esgotos domésticos. Este artigo apresenta uma revisão sobre a ocorrência dos estrogênios estrona, estradiol, estriol e etinilestradiol em esgotos brutos e tratados e em águas superficiais, bem como sobre sua remoção por diferentes processos de tratamento biológico de esgoto. Os poucos trabalhos realizados no Brasil mostram que a concentração desses compostos nestas matrizes é expressiva. Além disso, foi observado um decaimento nas concentrações desses estrogênios do esgoto bruto ao tratado. Os sistemas aeróbios, como lodos ativados, mostraram melhor desempenho na remoção de estrogênios, sobretudo por meio da sorção ao lodo. No entanto, pouco se sabe sobre os mecanismos de degradação de tais compostos nestes processos e sobre o comportamento de seus conjugados. Portanto, os processos de tratamento biológico de esgoto representam uma barreira à introdução de estrogênios nos corpos hídricos.

Resumo Este trabalho apresenta uma revisão descritiva de leis e normas adotadas pelos países da Europa, das Américas e Austrália sobre gestão de medicamentos e de seus resíduos. Esta revisão integra pontos relevantes de documentos oficiais das agências reguladoras desses países, bem como de trabalhos científicos importantes. Todos os países pesquisados realizam gestão de medicamentos concomitantemente com a gestão de seus resíduos, atuando desde programas de conscientização sobre o uso racional e os riscos dos medicamentos até na coleta e disposição segura de seus resíduos. A Alemanha, os EUA e a Suécia exigem uma avaliação prévia do impacto ambiental provocado pelo medicamento como critério de seu registro. Em destaque, a Suécia que periodicamente atualiza uma lista de medicamentos essenciais baseada na avaliação do risco e do perigo ambiental de seus resíduos. No Brasil, as medidas legais propostas como prescrição racional e logística reversa ainda não foram efetivamente implementadas. A avaliação prévia de impacto ambiental resguarda os riscos à saúde humana e da biota selvagem causados pela exposição aos resíduos de medicamentos. Portanto, esses modelos internacionais poderiam servir de base para discussões e/ou alterações legais e normativas no Brasil. Abstract This paper presents a descriptive review of laws and regulations on the management of drugs and the residues thereof adopted by countries in Europe, the Americas and Australia. This review integrates relevant points of official documents of regulatory agencies in these countries, as well as important scientific works. All countries surveyed carry out drug management concomitant with the management of the residues thereof, ranging from awareness programs on the rational use and the risks of drugs through to the collection and safe disposal of such residues. Germany, the USA and Sweden demand a prior assessment of the environmental impact caused by a given drug as a criterion for its registration. Sweden is noteworthy in that it periodically updates a list of essential drugs based on risk assessment and the environmental risks posed by the residues thereof. In Brazil, the legal measures proposed including rational prescription and reverse logistics have not yet been effectively implemented. Prior environmental impact assessment safeguards the risks to human health and the wild biota caused by exposure to drug residues. Therefore, these international models could serve as a basis for discussion and/or legal and regulatory changes in Brazil.

Sewage treatment systems can prevent the direct discharge of endocrine disruptors, such as 17α-ethinylestradiol (EE2), into the environment. Treatment systems capable of promoting total phosphorus (TP) removal, such as sequencing batch reactors (SBRs), are promising in this regard. Two lab-scale SBRs with different sludge retention times (SRTs) were assessed for their EE2 and TP removal rates. Anaerobic/aerobic/anoxic phases with cycles of 6 h were used to treat sewage containing EE2 at a concentration of 5 μg L-1. The removal rates of chemical oxygen demand and TP were approximately 80% for both the SBRs. Partial nitrification was observed in the SBRs. Initially, concentrations of EE2 above 1.0 μg L-1 in the treated sewage were measured. These concentrations were smaller in SBR 1, which used lower SRTs; EE2 was removed by sludge sorption. After the 56th cycle, the concentrations of EE2 in the treated sewage were below 0.1 μg L-1 in both the SBRs, indicating that its removal may have occurred by biodegradation due to acclimation to the process. Therefore, both TP removal and nitrification seem to play an important role in EE2 removal by SBRs. Keywords: A2O SBR, EE2 and TP removal, sewage treatments.

This paper presents a descriptive review of laws and regulations on the management of drugs and the residues thereof adopted by countries in Europe, the Americas and Australia. This review integrates relevant points of official documents of regulatory agencies in these countries, as well as important scientific works. All countries surveyed carry out drug management concomitant with the management of the residues thereof, ranging from awareness programs on the rational use and the risks of drugs through to the collection and safe disposal of such residues. Germany, the USA and Sweden demand a prior assessment of the environmental impact caused by a given drug as a criterion for its registration. Sweden is noteworthy in that it periodically updates a list of essential drugs based on risk assessment and the environmental risks posed by the residues thereof. In Brazil, the legal measures proposed including rational prescription and reverse logistics have not yet been effectively implemented. Prior environmental impact assessment safeguards the risks to human health and the wild biota caused by exposure to drug residues. Therefore, these international models could serve as a basis for discussion and/or legal and regulatory changes in Brazil.

Biological wastewater treatment processes with biological nitrogen removal are potential sources of nitrous oxide (N2O) emissions. It is important to expand knowledge on the controlling factors associated with N2O production, in order to propose emission mitigation strategies. This study therefore sought to identify the parameters that favor nitrite (NO2-) accumulation and its influence on N2O production and emission in an anaerobic/aerobic/anoxic/aerobic sequencing batch reactor with biological nitrogen removal. Even with controlled dissolved oxygen concentrations and oxidation reduction potential, the first aerobic phase promoted only partial nitrification, resulting in NO2- build-up (ranging from 29 to 57%) and consequent N2O generation. The NO2- was not fully consumed in the subsequent anoxic phase, leading to even greater N2O production through partial denitrification. A direct relationship was observed between NO2- accumulation in these phases and N2O production. In the first aerobic phase, the N2O/NO2- ratio varied between 0.5 to 8.5%, while in the anoxic one values ranged between 8.3 and 22.7%. Higher N2O production was therefore noted during the anoxic phase compared to the first aerobic phase. As a result, the highest N2O fluxes occurred in the second aerobic phase, ranging from 706 to 2416 mg N m-2 h-1, as soon as aeration was triggered. Complete nitrification and denitrification promotion in this system was proven to be the key factor to avoid NO2- build-up and, consequently, N2O emissions.

Emerging contaminants such as 17α-ethynylestradiol (EE2) can be discharged from sewage systems and contaminate water supplies. Paranoá Lake is a strategic water reservoir in Brasília (Brazil) that receives treated sewage from sewage treatment plants (STPs) and has recently become a water supply. This study monitored EE2 residues in different matrices from Paranoá Lake watershed using the ELISA method. This monitoring was performed together with the local environmental agency in two periods. EE2 was detected in all sewage samples showing that this residue is continually being discharged into the lake. However, EE2 was found in only one freshwater sample (0.07 ng L-1), which is below the predicted no-effect concentration considered as a risk for aquatic animals. EE2 was not detected in treated water. Nevertheless, the increased use of freshwater as a water supply signals the need for continuous EE2 monitoring in the lake.

Os aterros sanitários são uma técnica de disposição final de resíduos que vai ao encontro das exigências legais brasileiras. No entanto, os processos que ocorrem nas células dos aterros originam um efluente de complexa composição denominado lixiviado, o qual requer tratamento adequado. Diferentes processos de tratamento de lixiviado considerados avançados já têm sido empregados no Brasil. Além disso, uma estratégia muito comum é o envio do lixiviado para as estações de tratamento de esgoto (ETE), para que os dois efluentes sejam tratados de forma conjunta. Porém, tanto os processos adotados nas estações de tratamento de lixiviado quanto os que se utilizam nas ETE, têm por objetivo a remoção de matéria orgânica e nutrientes, não contemplando os chamados contaminantes emergentes. Diante disso, este trabalho se propõe a discutir as principais formas de tratamento do lixiviado de aterro sanitário, com ênfase na remoção desses contaminantes. Muitas das técnicas de tratamento estudadas já são adotadas para tratar lixiviados em aterros brasileiros, o que pode significar eventual remoção desses compostos. A inclusão destas técnicas, como etapa de pré-tratamento do lixiviado e pós-tratamento nas ETE que o recebem, poderia promover a redução de contaminantes emergentes no efluente final.

This study sought to determine the effects of different operating conditions, such as variable organic loading, different sludge retention times (SRTs) and airflow rates, limited dissolved oxygen (DO) concentrations and ammonium (NH4+) shock loading on total nitrogen (TN) removal routes and nitrous oxide (N2O) emissions in a lab-scale activated sludge system. Short SRT (5 days) combined with very low DO levels (0.5 mg L-1) were responsible for lower TKN oxidation efficiencies and, consequently, negligible NO2- accumulation rates. These results suggest that nitrification efficiency was hampered by the oxidation of organic matter, with a large part of TN removed by sludge waste process. As the SRT increased (from 5 to 10 days) and DO was set to 1.0 mg L-1, TKN oxidation rates and NO2- accumulation reached their maxima, which are thought to be the optimal conditions for both organic matter oxidation and partial nitrification. Under these conditions, gas transfer to the atmosphere became the preferential route for TN removal instead of incorporation into the sludge waste. However, N2O contribution is estimated as less than 5.6% (with respect to TN in the influent). Insufficient aeration and stress conditions (such as NH4+ shock loading) can cause limited DO conditions and NO2- accumulation, leading to higher amounts of emitted N2O. Therefore, the adequate control of DO concentrations is a key factor to avoid NO2- accumulation and consequently high N2O emissions.

Resumo Foi avaliada a relação entre a distribuição de medicamentos usados na pandemia por SARS-COV-19 no município do Rio de Janeiro e o nível de risco ambiental estimado provocado por seus resíduos. Foi coletada a quantidade de medicamentos distribuídos pelas unidades de atenção primária à saúde (APS) entre 2019 e 2021. O quociente de risco (QR) correspondeu à razão entre a concentração ambiental preditiva estimada (PECest), obtida pelo consumo e excreção de cada fármaco, e a sua concentração preditiva não efetiva (PNEC). Os PECest da azitromicina e da ivermectina aumentaram entre 2019 e 2020, tendo uma queda em 2021 provavelmente devido ao desabastecimento. Já o da dexclorfeniramina (DEX) e da fluoxetina (FLU) tiveram uma queda, retornando o crescimento em 2021. Enquanto o PECest do diazepam (DIA) aumentou ao longo desses três anos, o etinilestradiol (EE2) diminuiu, possivelmente pela priorização da APS no tratamento da COVID-19. Os maiores QR foram de FLU, EE2 e AZI. O padrão de consumo desses medicamentos não refletiu seu risco ambiental, pois os mais consumidos possuem baixa toxicidade. Vale destacar que alguns dados podem estar subestimados devido ao incentivo que foi dado durante a pandemia para o consumo de determinados grupos de fármacos. Abstract The relationship between the distribution of medicines used in the Pandemic by SARS-COV-19 in the municipality of Rio de Janeiro and the estimated level of environmental risk caused by their residues was evaluated. The amount of medicines distributed by primary health care (PHC) units between 2019 and 2021 were collected. The risk quotient (RQ) corresponded to the ratio between the estimated predictive environmental concentration (PECest) obtained by the consumption and excretion of each drug and its non-effective predictive concentration (PNEC). Between 2019 and 2020, the PECest of azithromycin (AZI) and ivermectin (IVE) increased between 2019 and 2020, with a decrease in 2021 probably due to shortages. Dexchlorpheniramine (DEX) and fluoxetine (FLU) fell, returning to growth in 2021. While the PECest of diazepam (DIA) increased over these 3 years, ethinylestradiol (EE2) decreased possibly due to the prioritization of PHC in the treatment of COVID-19. The largest QR were from FLU, EE2 and AZI. The consumption pattern of these drugs did not reflect their environmental risk because the most consumed ones have low toxicity. It is worth noting that some data may be underestimated due to the incentive given during the pandemic to the consumption of certain groups of drugs.

This paper presents a descriptive review of laws and regulations on the management of drugs and the residues thereof adopted by countries in Europe, the Americas and Australia. This review integrates relevant points of official documents of regulatory agencies in these countries, as well as important scientific works. All countries surveyed carry out drug management concomitant with the management of the residues thereof, ranging from awareness programs on the rational use and the risks of drugs through to the collection and safe disposal of such residues. Germany, the USA and Sweden demand a prior assessment of the environmental impact caused by a given drug as a criterion for its registration. Sweden is noteworthy in that it periodically updates a list of essential drugs based on risk assessment and the environmental risks posed by the residues thereof. In Brazil, the legal measures proposed including rational prescription and reverse logistics have not yet been effectively implemented. Prior environmental impact assessment safeguards the risks to human health and the wild biota caused by exposure to drug residues. Therefore, these international models could serve as a basis for discussion and/or legal and regulatory changes in Brazil.