Navegando por Assunto "Domestic effluents"

Agora exibindo 1 - 3 de 3

Acesso aberto (Open Access)
Avaliação de cargas poluidoras de nutrientes em canais urbanos de macrodrenagem no município de Belém/PA
(Universidade Federal do Pará, 2023-02-28) BORGES, Erika Joana Nabiça; COELHO, André Luiz da Silva Salgado; http://lattes.cnpq.br/0853586340257273
With the expansion and population growth of the municipality of Belém/PA, areas with little or almost no sanitation infrastructure were developed, since as it grew, it circumvented water accidents instead of sanitizing them, resulting in large investments in works of macrodrainage currently, in peripheral areas. This work sought to evaluate the degree of pollution caused by polluting loads of nutrients in the 03 (three) macrodrainage channels, being Quintino Bocaiúva, Timbiras and Caripunas, belonging to BHEN, whose contribution flows into the main source of public supply in the municipality. For this, the work carried out the calculation of polluting loads of nutrients, analyzing NTK, ammoniacal-N, organic-N, Nitrate (NO3) and Total Phosphorus, in 5 qualitative campaigns, in addition to having carried out a bathymetric survey in 3 campaigns, considering the rainy and less rainy period. Initially, the flow results were presented, which after simulation it was verified that the highest flow is related to the Quintino channel, which was to be expected due to its greater contribution area. The correlation between nutrients and physical variables of temperature, OD and pH of the water was also verified. Thus, it was found that despite being small in most cases, there is a correlation between those mentioned. In addition, the concentration of the parameters was analyzed separately, based on the results of the laboratory analysis, in which the forms of nitrogen and phosphorus exceeded the limits recommended in the legislation, also expected due to the high contribution of the subbasins, in addition to there being no treatment efficient domestic sewage system in this area. Finally, the polluting load values were analyzed based on the relationship between flow and concentration, resulting in high values of load released into the receiving body, characterizing a scenario of extreme water degradation. Still, with this relationship it was possible to estimate the population that would be contributing to this scenario, whose numerical values were also quite high and not consistent with the reality in the area. Therefore, through these results, it is possible to affirm that they may be harmful to the waters of the canals, where a significant degradation of the quality of the waters is expected, which will follow to the Guamá river, and consequently, will reach the population that directly or indirectly have contact with these bodies of water
Acesso aberto (Open Access)
O balanço de massa das unidades componentes de uma estação de tratamento de esgoto e a utilização da estatística multivariada como ferramenta de verificação do comportamento físico, químico, bacteriólogico e de metais no esgoto bruto e tratado. Estudo de caso: estação de tratamento de esgoto doméstico – ETE Sideral - Belém - PA
(Universidade Federal do Pará, 2013-10-04) FARIAS, Flavia da Silva; MENDONÇA, Neyson Martins; http://lattes.cnpq.br/7534816053779593
The mass balance of the component units of a wastewater sewage treatment and use of multivariate statistics as a tool for verifying the behavior of raw sewage and treated, was implemented in ETE Sidereal Municipality of Belem do Para in Brazil. This study observed the entire flowchart constituent of the station that is designed to receive a maximum flow of raw sewage of 73 l / s. and now serves a flow of only 1.7 l / so that decreases in 96% of the station was designed, realizing then that today the Sidereal ETE is oversized. In verifying the constituent physical parts of the station there were not in compliance measures that have been suggested in the executive project and were perceived as "in situ". In the mass held for three types of flows: maximum (73 l / s) averaged 43 l / if current 1.7 l / s realized that the decrease in attendance constituent units of the system decreases somewhere around 97.5% the volume to which the components are designed for and found in the Sewage Treatment Station Sidereal. In the characterization of the metals present in the raw sewage treated and it was found that the Principal Component Analysis of the boron (B) (63.5%) and followed by barium (Ba) with (21.9%) justify 84.48% the coefficient of variation that determine how prevalent metal in the influent. In Effluent Boron (B) showed a coefficient of variation of 73.7% which justifies as the main component in the influent of WWTP. In the characterization of metals in the sludge was observed that with a percentage of 98.8% the Barium (Ba) is the main element found. The results obtained with principal component analysis to characterize the physic-chemical and bacteriological analyzes of raw sewage and treated ETE observed that the variable "total COD" is positively related to component BOD and negatively correlated with the Total Alkalinity . Regarding physic-chemical and bacteriological, high levels of BOD, Fecal coliform, TSS and VSS, from the releases of effluents, making present the highest concentrations of organic load remaining.
Acesso aberto (Open Access)
Investigação da influência antrópica na concentração de nutrientes inorgânicos dissolvidos no entorno da cidade de Belém-PA
(Universidade Federal do Pará, 2022-08-30) PORTO, Yuri Paixão Santa Rosa; ROLLNIC, Marcelo; http://lattes.cnpq.br/6585442266149471; https://orcid.org/0000-0002-8601-1514
Water is one of the most important natural resources, especially in the Amazon context. The disorderly population increase and consequent mismanagement of this resource causes worrying environmental changes in terms of its quality. According to the National Sanitation Information System - SNIS, the northern region of the country treats about 22.0% of the sewage generated and in the Metropolitan Region of Belém, below the national average, with 11.3% of sewage collection. The study area encompasses Guajará Bay and adjacent areas such as the Guamá and Acará rivers. Water collections were carried out during the rainy season (May), in 4 sections divided into left bank (ME), middle (M) and right bank (MD) with surface and bottom collections, every 4 hours for 13 hours to analyze the entire tidal cycle. Parameters were analyzed in situ (Temperature, pH, Eh, electrical conductivity, turbidity, OD, %OD and total dissolved solids) and in the laboratory (Silicate, phosphate, nitrate and nitrite), in addition to determining the intensity, speed and direction of the current. with the aid of an ADCP to obtain the flow and calculate the nutrient flow. The study area has some more remote places with little or no human influence throughout its extension, and others with untreated domestic and industrial effluent discharge points. The objective of this work is to investigate a possible anthropic contribution in the flow of dissolved inorganic nutrients from the water bodies that bathe the city of Belém-PA and surroundings. The Guamá River near the “alça viária” showed the lowest values of dissolved inorganic nutrients, unlike the Acará River which, despite its geographical distance from the RMB, showed the highest values of nutrient concentration. The mouth of the Guamá river had higher nutrient values on its right bank and the Guajará bay in its central portion, due to the influence of domestic and industrial waste. The Guamá river near the “alça viária” is relatively preserved, with a low concentration of dissolved inorganic nutrients, increasing only near its mouth, while the Acará presented higher values mainly due to the intense agricultural activity in the surroundings of its basin. The Guajará Bay, despite receiving discharges from the Acará and Guamá rivers, has lower nutrient values than the two locations, demonstrating its capacity for self-purification and dilution.