Sistema integrado reator anaeróbio+microalgas+wetlands construídos no tratamento de efluentes urbanos.

Abstract

The design and construction of the Integrated Anaerobic Reactor (AR) + Microalgae system + Post Microalgae Constructed Wetland (AR + MA + PMACW), was developed for realization of campus sewage treatment trials located in Santa Cruz do Sul (UNISC). Black and yellow water were fed to the system in batch regime from the equalizer Tank Effluent UNISC Treatment Plant (WWTP), considering hydraulic retention time of three days for the integrated system, divided into two stages: Stage I was developed the integrated system and realized the collection of samples for monitoring the operation; Stage II was kept the system analysis with setup adjustments identified during Stage I. The supplies after adjustments (every three days) used in load factors 68.5 g day-1 for the anaerobic reactor (AR), 263,6 g m -1 day -1 for each unit of the Constructed Wetlands of Vertical Flow (CWVF) end for each unit of the system Filter Control (Control-C) and 87,83 g m-1 day-1 for unit containing microalgae (MA). The reductions of the parameters of polluting loads obtained with the integrated AR + MA + CWPMA were effective in all parameters compared to the raw effluent (EB) mainly in terms of removing nitrogen groups, with ratios of 100% removal NH3. In addition to providing a satisfactory removal efficiency eutrophying agents, there was also a promising response when subjected to toxicity testing, since the effluent analyzed after treatment with the integrated system showed no phytotoxicity, ecotoxicity and genotoxicity exceeding the results obtained with CWVF treatments and Control-C. The study developed obtained significant results that indicate that this is a promising alternative in the treatment of wastewater for decentralized units.