Treatment of sanitary effluent by the association of septic tank and wetland built aerated and not aerated
DOI:
https://doi.org/10.6008/CBPC2179-6858.2021.004.0038Keywords:
Wastewater treatment, Horizontal runoff wetlands, Aerated horizontal runoff wetlandsAbstract
The objective of this work was to evaluate the performance and behavior of a sanitary sewage treatment system of a mining company, located in the municipality of Nova Lima - MG, consisting of a septic tank (TS) followed by a horizontal aerated subsurface drainage wetland (WAHESS) and a full-scale horizontal subsurface flow (WHESS) wetland and the potential for replicability in other systems and companies. The effluent treatment system was designed for an average daily flow of 40 m³ dia⁻¹, BOD loads (Biochemical oxygen demand) of 13.5 kg dia⁻¹, COD (Chemical oxygen demand) of 27.5 kg day⁻¹, and SST load (total suspended solids) of 15 kg day⁻¹, consisting of two TS of 18 m³ each and TDH (Hydraulic holding time) of 0.5 day, followed by two built Wetlands ( WC), with the first with 1.49 day⁻¹ HDR cultivated with Cyperus prolifer and the second with 0.64 day TDH cultivated with Thalia Dealbata, with crushed stone 1 as a support medium in the wetlands. The variables BOD, COD, SST, turbidity, pH and temperature were evaluated every two weeks, totaling 10 samples in the period from 03/10/2019 to 02/18/2020, in addition to the flow data. It was observed that the WC system was essential for the treatment of effluents, with WAHESS having the highest pollutant removal rates (94% and 88% for BOD and COD respectively, SST with 83% and turbidity with 94%), followed by WHESS. The study allowed to conclude that the use of WC for the treatment of domestic sewage after treatment by ST was efficient, reaching the values required by the current state legislation for the discharge of effluents.
Downloads
Downloads
Published
Issue
Section
License
The CBPC - Companhia Brasileira de Produção Científica (Brazil CNPJ: 11.221.422/0001-03) the material rights of the published works. The rights relate to the publication of the work anywhere in the world, including rights to renewals, expansions and dissemination of the contribution, as well as other subsidiary rights. All electronically published works may subsequently be published in printed collections under the coordination of this company and / or its partners. The authors preserve the copyright, but are not allowed to publish the contribution in another medium, printed or digital, in Portuguese or in translation.