Evaluation of a new approach for swine wastewater valorisation and treatment: A combined system of ammonium recovery and aerated constructed wetland

Ammonia stripping and scrubbing followed by nitrification and denitrification saves costs for manure treatment based on a calibrated model approach

“…Over the last decades, experiments to access the removal rates of NH3 stripping technology have been performed on laboratory, pilot and full-scale. The removal rates found during our experiment were similar to the removal rates found by other studies; Brienza et al [15] found a NH3 stripping efficiency of 22% while evaluating a pilot installation processing LF of digestate at low temperature (25°C) and low pH (8.0) with an average retention time of 2 hours, Baldi et al [35] reached a removal efficiency of 62% when performing a stripping trial on digestate for 2 hours at a temperature of 48°C and an increased pH 9.5 by adding NaOH, Pintucci et al [36] performed NH3 stripping at low pH (7.8) and high temperature (55-65°C) and achieved a NH3-removal between 28 and 46% depending on the temperature. Liu et al [12] obtained a set of hourly NH3removal rates (8%; 15%, 30%, 53% and 57%) for different air flow rates (60, 120, 240, 600 and 840 m 3 h -1 m 3 ) when stripping urine at a temperature of 50°C and a pH of 10.…”

“…For the recovery of N from pig manure, De Vrieze et al [14] found that all investigated N recovery technologies have higher net costs (Total cost -Revenue) than conventional N removal to achieve 80-90 % of influent N reduction. Brienza et al [15] and Van Puffelen et al [16] arrived at similar conclusions concerning the negative economic performance of N recovery technologies applied as alternative manure management. However, in contrast to LF treatment schemes including membrane filtration and precipitation, an approach of NH3 SS for N recovery and NDN for effluent polishing has been identified as the economically most promising option for N recovery maintaining good effluent quality from concentrated streams.…”

“…These removal rates are at high air flow rates slightly higher than the NH3-removal efficiency found in this study. This could be due to the higher COD content in manure than urine which jeopardised the NH3 volatilisation rate by binding NH4 + to OM [15]. As Liu et al [12] showed that further increasing the airflow rate above 600 m 3 h -1 m -3 could hardly enhance NH3-removal rates.…”

“…De Vrieze et al [14] found that the costs associated to NDN equal 10.95 € t -1 manure or 2.32 € kg-N -1 processed, while the treatment scenario containing SS followed by NDN had an elevated treatment cost of 16.51 or 3.51 € kg-N -1 processed. Brienza et al [15] found that a combined system of NH4 + recovery through NH3 stripping and an aerated constructed wetland (17.1 € t -1 LF of digestate, 3.71 € kg-N -1 processed) to achieve 90% N removal was economically undesirable compared to N removal from digestate by NDN (16.0 € t -1 processed, 3.40 € kg-N -1 processed).…”

Research Advancements in Swine Wastewater Treatment and Resource-Based Safe Utilization Management Technology Model Construction

“…At the same time, it also had high removal rates for antibiotics, toxic metal elements, and ARGs. Meanwhile, Brienza et al [52] established a new combined system of ammonium recovery and aerated constructed wetland. The core of the system was to recover nitrogen from swine wastewater using an NH 3 stripping process and then purify it using an aerated constructed wetland.…”