Contribuição da zona de raízes em sistemas alagados construídos de escoamento subsuperficial horizontal para tratamento de efluentes sanitários

• Ano de defesa: 2016
• Autor(a) principal: Andre Baxter Barreto
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Meio ambiente; Recursos hídricos; Saneamento; Rizosfera; Engenharia sanitária; Aguas residuais Purificação Tratamento biologico; Sistemas alagados construídos
• Link de acesso: http://hdl.handle.net/1843/BUOS-ATSMBJ

Determining kinetic parameters in Horizontal Subsurface Flow Constructed Wetlands (HSSF-CW), such as oxygen consumption rates and biomass concentrations are research subjects in this area. The present research aimed to develop and apply methods for investigate the root zone and its relations with microbial communities and pore water characteristics in HSSF-CW). The study was conducted in the HSSF-CW at CePTS - Center for Research and Training in Sanitation - UFMG / COPASA where two beds (planted and unplanted) were fed, each one, with 7.5 m³ d-1 of UASB (Upflow Anaerobic Sludge Blanket Reactor) effluent. The work was divided into two stages. In the first, it is presented a novel methodology for studies of undisturbed samples of the original bed from HSSF-CW, using a reactor (Planted Fixed Bed Reactor) that reproduces in macroscale the infinitesimal reactional unit of constructed wetland bed. Six PFR were installed in two sections of the HSSF-CW (planted and unplanted) and fed by pumping the interstitial liquid from the support medium. The environmental parameters on the monitoring points along the system showed similarity between the original environmental conditions in the support media and the PFR. Results endorse the method as a tool for rhizosphere and support media research. In the second stage of this research, it is presented a methodology to perform respirometric tests with undisturbed samples of full scale HSSF-CW beds, using an adaptation of the PFR as respirometric unit. The use of the adapted PFR to perform respirometric tests proved very practical, useful and representative of field conditions, despite still necessary improvements. Results suggest that beds planted by different plant species may have different respiration rates due to the morphology and physiology of the species concerned (Typha latifolia 20,1 g m-3 d-1 O2; Canna x generalis 147,8 g m-3 d-1 O2). Planted samples also showed higher respiration rates than unplanted samples (12,8 g m-3 d-1 O2). This statement corroborates the literature on these systems, overcoming another obstacle to this line of research, which is to study undisturbed samples of CW and employ respirometric method for kinetic parameters obtaining. It also reveals the importance of the root zone to the wastewater treatment in constructed wetlands.