Effect of pH, temperature and air flow rate on the continuous ammonia stripping of the anaerobic digestion effluent

Guštin, Simon; Marinšek-Logar, Romana

doi:10.1016/j.psep.2010.11.001

Cited by 311 publications

(138 citation statements)

References 21 publications

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“…The mixture also prevents potential nitrification and autotrophic denitrification in the anoxic tank. After hydrolysis, nitrogen in the urine (mostly as ammonium) can be easily recovered through various physicochemical technologies, such as ammonia stripping (Gustin and Marinsek-Logar, 2011) exchange (Hedstrom and Amofah, 2008), or some combination of these technologies (Lind et al, 2000). The recovered nitrogen, in the form of either struvite or concentrated ammonium solution, can be further used for horticultural activities in cities.…”

Section: Engineering and Administrative Aspectsmentioning

confidence: 99%

Adaptation of urine source separation in tropical cities: Process optimization and odor mitigation

Zhang

Giannis

Chang

et al. 2013

Journal of the Air & Waste Management Association

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Source-separating urine from other domestic wastewaters promotes a more sustainable municipal wastewater treatment system. This study investigated the feasibility and potential issues of applying a urine source-separation system in tropical urban settings. The results showed that source-separated urine underwent rapid urea-hydrolysis (ureolysis) at temperatures between 34-40 o C, stale/fresh urine ratios greater than 40%, and/or with slight fecal cross-contamination. Undiluted (or low-diluted) urine favored ureolysis; this can be monitored by measuring conductivity as a reliable and efficient indicator. The optimized parameters demonstrated that an effective urine source-separation system is achievable in tropical urban areas. On the other hand, the initial release of CO 2 and NH 3 led to an elevated pressure in the headspace of the collection reservoir, which then dropped to a negative value, primarily due to oxygen depletion by the microbial activity in the gradually alkalized urine. Another potential odor source during the ureolysis process was derived from the high production of volatile fatty acids (VFA), which were mainly acetic, propanoic, and butyric acids. Health concerns related to odor issues might limit the application of source separation systems in urban areas; it is therefore vital to systematically monitor and control the odor emissions from a source separation system. As such, an enhanced ureolysis process can attenuate the odor emissions.Implications: Urine source separation is promising to improve the management of domestic wastewater in a more sustainable way. The work demonstrates the achievability of an effective urine source-separation system in tropical urban areas. The installation of urine-stabilization tanks beneath high-rise buildings lowers the risk of pipe clogging. Conductivity measurement can be utilized as a reliable process indicator for an automated system. However, urine hydrolysis raises a strong potential of odor emission (both inorganic and organic), which might limit the application of source separation systems in urban areas. An enhanced ureolysis process could shorten and attenuate the odor emissions.

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Section: Engineering and Administrative Aspectsmentioning

confidence: 99%

Adaptation of urine source separation in tropical cities: Process optimization and odor mitigation

Zhang

Giannis

Chang

et al. 2013

Journal of the Air & Waste Management Association

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“…Previous works showed that the pH value, temperature, flow rate and flow time influenced the nitrogen removal in air stripping [15,20]. In this work, the initial pH was 8.3-8.5, which can be regulated to 9.0 or 10.5 by NaOH and HCl; however, because of the very high initial potassium concentration in the wastewater, the addition of NaOH would lead to the microalgae experiencing salinity stress.…”

Section: Air Stripping For Ammonia Removalmentioning

confidence: 88%

“…A previous literature review showed that Chlorella sp. is highly resistant to inhibitors in wastewaters [15]. Therefore, Chlorella vulgaris 1067 was chosen as the test strain.…”

Section: Microalgae Strainmentioning

confidence: 99%

Nitrogen and Biomass Recovery from Low Carbon to Nitrogen Ratio Wastewater by Combing Air Stripping and Microalgae Cultivation

Ma¹,

Lu²,

Zhang³

et al. 2016

JRST

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an air stripping-microalgae cultivation system was proposed to recover nitrogen and produce biomass from biogas fertilizer production wastewater. air stripping was firstly used for reducing the nitrogen to low levels. Then microalgae were used for absorbing the residual nitrogen. Results showed that the nitrogen removal reached 95.0%, with a microalgae productivity and biomass yield of 0.21 (g/L/d) and 4.29 (g-biomass/g-nitrogen), respectively. For the system, 87.7% of the total nitrogen was recycled, from which 83.9% came from air stripping and 3.8% from microalgae absorption. This system enables carbon-emission reduction, wastewater treatment and the promotion of nitrogen recovery.

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“…The temperature of the experiments was the value fixed by the WWTP operators, 60 °C and the effect of its variation was not studied in this work. The change of the ammonia/ammonium ratio in favor of ammonia is mainly affected by the pH, with less impact of the temperature [40]. In addition, temperature changes needed longer times to be applied in the full-scale stripping unit.…”

Section: Ammonia Stripping With Sludge Liquid and Treated Urinementioning

confidence: 99%

Recovery of N and P from Urine by Struvite Precipitation Followed by Combined Stripping with Digester Sludge Liquid at Full Scale

Morales

Boehler

Buettner³

et al. 2013

Water

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A novel ammonia stripping method, including a CO 2 pre-stripper was used to treat a mix of supernatant liquor from an anaerobic digester and urine in order to recycle nitrogen as ammonium sulfate at full-scale in the WWTP Kloten/Opfikon. Waste streams were not generated, since the ammonia was recovered as a marketable nitrogen fertilizer, turning a waste product into a valuable product. The efficiency of this system was increased by means of the addition of pre-treated urine collected separately at EAWAG building. The separation step was performed by the use of water free urinals and urine diversion flush toilets. An increase of 10% in the liquid flux with the addition of the urine translated into a 40% increase of the ammonia concentration in the inlet of the stripping unit. The achievement of these percentages generated a proportional increase in the fertilizer production. The urine pre-treatment was carried out by adding magnesium to produce a precipitate of struvite. The first experiments with the combined treatment showed the feasibility of the combination of the separation and pre-treatment steps. OPEN ACCESSWater 2013, 5 1263

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Effect of pH, temperature and air flow rate on the continuous ammonia stripping of the anaerobic digestion effluent

Cited by 311 publications

References 21 publications

Adaptation of urine source separation in tropical cities: Process optimization and odor mitigation

Adaptation of urine source separation in tropical cities: Process optimization and odor mitigation

Nitrogen and Biomass Recovery from Low Carbon to Nitrogen Ratio Wastewater by Combing Air Stripping and Microalgae Cultivation

Recovery of N and P from Urine by Struvite Precipitation Followed by Combined Stripping with Digester Sludge Liquid at Full Scale

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