Performance of subsurface flow constructed wetland taking pretreated swine effluent under heavy loads

Efeito da vegetação em sistemas alagados construídos para tratar águas residuárias da suinocultura

“…Amorim et al (2015), mesmo trabalhando com taxas de carregamento de P superiores às avaliadas neste trabalhoentre 13 e 240 kg ha -1 d -1 -obtiveram baixa eficiência na remoção de P, que variou entre 20 e 30%. Lee et al (2004) também verificaram menores eficiências na remoção de P (47 a 59%) que as obtidas aqui. Sousa et al (2004), avaliando durante três anos o desempenho de três SACs utilizados no tratamento de esgoto doméstico, observaram que a máxima eficiência de remoção de P ocorreu no primeiro ano de operação, alcançando o valor de 86%, decaindo substancialmente nos anos seguintes, até atingir baixas eficiências no terceiro ano.…”

Performance of the constructed wetland system for the treatment of water from the corumbataí river

“…A higher value was achieved in the system used here after 20 days, however the water treated passed through the reactor containing aquatic plants as well as the one with soil, gravel, and peat (Table 4). Schulz et al (2004) obtained 41.0-53.0% efficiency in reducing total phosphorous after 56 to 70 days of treatment, respectively, and Lee et al (2004) reported 47.0% in phases I and II, corresponding to 1 to 182 days, and 59.0% in phase II, from 183 to 244 days. The results showed a maximum efficiency of 97.4% at 20 days (Table 4) in the system-containing reactor 4, representing an improvement compared to the results obtained by Lee et al (2004).…”

“…In the CWs used by Schulz et al (2004), there was 30.0-31.0% efficiency in the reduction of CDO after 56 and 98 days, respectively. Lee et al (2004), in a system with three periods of hydraulic retention (HRT), obtained 84.0% efficiency in phase I (1 to 109 days), with lower values at longer periods of time.…”

Constructed wetland in wastewater treatment

“…In the case of the CW under analysis, total phosphorus was mechanically sieved from the effluent (removal = 89%). However, orthophosphate significantly increased by 73.7%, since removal of total phosphorus is primarily related to the retention capacity of root and to equilibrium of phosphorus concentration by anaerobic conditions (Lee et al, 2004) (Table 2).…”