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Water 2016, 8(9), 365;

Performance of Four Full-Scale Artificially Aerated Horizontal Flow Constructed Wetlands for Domestic Wastewater Treatment

Cranfield University, College Road, Cranfield, Bedfordshire MK43 0AL, UK
Severn Trent Water, 2 St John’s Street, Coventry CV1 2LZ, West Midlands, UK
DICATECh, Polytechnic University of Bari, Bari 70125, Italy
Author to whom correspondence should be addressed.
Academic Editor: Hans Brix
Received: 2 June 2016 / Revised: 13 August 2016 / Accepted: 15 August 2016 / Published: 24 August 2016
(This article belongs to the Special Issue Constructed Wetlands for Water Treatment: New Developments)
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A comparison of the performance of four full-scale aerated horizontal flow constructed wetlands was conducted to determine the efficacy of the technology on sites receiving high and variable ammonia loading rates not yet reported in the literature. Performance was assessed in terms of ammonia and solids removal, hydraulic conductivity and mixing patterns. The capability of systems to produce ammonium effluent concentrations <3 mgNH4+-N/L was observed across all sites in systems receiving variable loadings between 0.1 and 13.0 gNH4+-N/m2/d. Potential resilience issues were observed in relation to response to spike loadings posited to be due to an insufficient nitrifying population within the beds. Hydraulic conductivity and flow mixing patterns observed suggested deterioration of the reactor effective volume over time. Overall, the study demonstrates the efficacy of the technology where ammonium removal is required on small sites receiving high and variable flow rates, with adequate removal of organics and solids, but no significant benefit to the long term hydraulics of the system. View Full-Text
Keywords: aeration; clogging; dissolved oxygen; nitrification; treatment wetlands aeration; clogging; dissolved oxygen; nitrification; treatment wetlands

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Butterworth, E.; Richards, A.; Jones, M.; Mansi, G.; Ranieri, E.; Dotro, G.; Jefferson, B. Performance of Four Full-Scale Artificially Aerated Horizontal Flow Constructed Wetlands for Domestic Wastewater Treatment. Water 2016, 8, 365.

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