A new constructed wetland design for nitrogen recovery of industrial composting leachates through bioconversion into a nitrate-rich hydroponic fertilizer
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引用次数: 0
Abstract
Nitrogen can be recovered from highly ammonium-concentrated wastes like composting leachates through nitrification into a nitrate-enriched fertilizer. Two Verticalized SubSurface Flow constructed Wetland (VSSFW) designs presenting 2 m (VSSFW 2 m) and 4 m (VSSFW 4 m) long packing-beds were compared for the bioconversion of industrial composting leachates. During a monitored treatment cycle of 96 h, the VSSFW 2 m displayed higher nitrification efficiency (Removal Efficiency RE (%) = 99.9 %) and higher nitrate NO3-N production (212 mg.L−1 final NO3-N concentration, Conversion Ratio (CR) = 1.35, Converted Mass Load (CML) = 74.8 g NO3-N.m−3packing.d−1) than the VSSFW 4 m (RE (%) = 81.6 %, 125 mg.L−1, CR = 0.78, CML = 46.2 g NO3-N.m−3packing.d−1). The nitrate-enriched solution produced by the VSSFW 2 m held comparable NO3-N concentration as the inorganic Hoagland fertilizer (210 mg.L−1). It demonstrated both the feasibility of the bioconvertion and the agronomical qualities of the obtained solution. On a 44 days steady-state operation, the VSSFW 2 m displayed better nitrification (RE (%) = 96.9 ± 3.9 %, Surface Loading Rate (SLR) = 22.9 ± 2.9 g NH4-N.m−2footprint.d−1) than the VSSFW 4 m (RE (%) = 81.5 ± 12.9 %, SLR = 14.7 ± 2.8 g NH4-N.m−2footprint.d−1). It also demonstrated significantly higher NO3-N production (211.6 ± 14.9 mg.L−1 final NO3-N concentration, CR = 1.35 ± 0.19 and CML = 78.4 ± 5.5 g NO3-N.m−3packing.d−1) than the VSSFW 4 m (211.6 ± 14.9 mg.L−1 final NO3-N concentration, CR = 1.35 ± 0.19 and CML = 78.4 ± 5.5 g NO3-N.m−3packing.d−1). Only the VSSFW 2 m was able to produce in steady-state operation a bioconverted fertilizer from composting leachates holding comparable agronomical values than the inorganic Hoagland fertilizer.
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The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies
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