The Effect of Low Temperatures on Ammonia Removal in a Laboratory-Scale Constructed Wetland

Freshwater toilet flushing consumes 20–35% of typical household water demand. Seawater toilet flushing, as practised by Hong Kong since 1958, provides an alternative water source. To maximise the benefits of this unique dual water supply, urine separation could be combined to allow low-cost struvite production and subsequent urine nitrification – in-sewer denitrification. This paper reports on a laboratory-scale study of seawater urine phosphate recovery (SUPR) and seawater–urine nitrification. A laboratory-scale SUPR reactor was run under three phases with hydraulic retention time between 1.5 and 6 h, achieving 91–96% phosphorus recovery. A urine nitrification sequencing batch reactor (UNSBR) was also run for a period of over 650 days, averaging 90% ammonia removal and loading of up to 750 mg-N/L.d. Careful control of the SUPR phosphate removal was found necessary for operation of the downstream UNSBR, and system integration considerations are discussed.

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Long-term effects of silver nanoparticles on performance of phosphorus removal in a laboratory-scale vertical flow constructed wetland

Journal of Environmental Sciences ◽

10.1016/j.jes.2019.07.012 ◽

2020 ◽

Vol 87 ◽

pp. 319-330 ◽

Cited By ~ 3

Author(s):

Juan Huang ◽

Jun Xiao ◽

Yang Guo ◽

Wenzu Guan ◽

Chong Cao ◽

...

Keyword(s):

Silver Nanoparticles ◽

Constructed Wetland ◽

Phosphorus Removal ◽

Laboratory Scale ◽

Vertical Flow ◽

Long Term Effects ◽

Vertical Flow Constructed Wetland

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Influent Constraints on Treatment and Biological Nitrification of Municipal Landfill Leachate

Water Quality Research Journal ◽

10.2166/wqrj.1985.028 ◽

1985 ◽

Vol 20 (3) ◽

pp. 57-75

Author(s):

S.E. Jasper ◽

J.W. Atwater ◽

D.S. Mavinic

Keyword(s):

Carbon Source ◽

Landfill Leachate ◽

Treatment Process ◽

Ammonia Removal ◽

Operating Conditions ◽

Laboratory Scale ◽

Carbon Removal ◽

High Ammonia ◽

Biological Nitrification ◽

Set Up

Abstract A laboratory-scale treatment process was set up to treat Port Mann Landfill leachate, a high ammonia, low degradable carbon leachate with occasional high metals. A single sludge, nitrification/denitrification system was run for 25 weeks, with methanol added as a carbon source to improve denitrification. The objective of the treatment process was to remove biodegradable carbon and ammonia (feed levels of 25 to 250 mg/L). Carbon removal, including methanol, was adequate at SRT's of 10 days or greater. An SRT of 5 days produced inadequate treatment. Of the metals of concern, all except nickel were concentrated in the biomass. Ammonia removal was inconsistent. Good nitrification occurred at the start of the study but no denitrification occurred until operating conditions were optimized. Both processes deteriorated as the study progressed. The study clearly demonstrated that changing influent characteristics constrained the overall treatment of the leachate.

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Insight into the Role of Substrate Materials, Plant, and Microbes in the Removal of Pharmaceutically Active Compounds Through Laboratory-Scale Constructed Wetland Studies

SSRN Electronic Journal ◽

10.2139/ssrn.3983772 ◽

2021 ◽

Author(s):

Manthiram Karthik Ravichandran ◽

Ligy Philip

Keyword(s):

Constructed Wetland ◽

Laboratory Scale ◽

Pharmaceutically Active Compounds ◽

Active Compounds ◽

Insight Into

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Investigation of Laboratory-Scale and Pilot-Scale Attached Growth Ammonia Removal Kinetics at Cold Temperature and Low Influent Carbon

Water Quality Research Journal ◽

10.2166/wqrj.2010.042 ◽

2010 ◽

Vol 45 (4) ◽

pp. 427-436 ◽

Cited By ~ 16

Author(s):

Robert Delatolla ◽

Nathalie Tufenkji ◽

Yves Comeau ◽

Alain Gadbois ◽

Daniel Lamarre ◽

...

Keyword(s):

Treatment Plant ◽

Pilot Scale ◽

Ammonia Removal ◽

Laboratory Scale ◽

Cold Temperature ◽

Removal Rates ◽

Attached Growth ◽

Testing Center ◽

Kinetics Of ◽

Carbon Concentrations

Abstract A mobile testing center was installed at a lagoon wastewater treatment plant (WWTP) at Terrebonne, Canada to investigate the rate of ammonia removal of attached growth treatment systems at 4°C and at low influent carbon concentrations. The testing center housed two laboratory-scale reactors, a pilot-scale BioStyr system (Veolia Water) and a pilot-scale moving bed bioreactor (MBBR) system (Veolia Water). Although the rates of laboratory-scale and the pilot-scale systems demonstrated that the exposure time to low temperature has a significant effect on the kinetics of the system, the ammonia removal rates of all the systems were shown to be significant at 4°C. A strong correlation was demonstrated between the rates of ammonia removal produced by the laboratory-scale reactors, the pilot BioStyr system and pilot MBBR system; thus verifying the scaleup capability of the laboratory-scale reactors and demonstrating that nitrifiers can achieve ammonia removal under cold temperature conditions for elapsed periods of time independent of the reactor design. Finally, the ammonia removal rates of the laboratory-scale systems, the BioStyr pilot system, and the MBBR pilot system were all accurately predicted by a recently proposed Theta model.

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