Removal of ammonia nitrogen in wastewater by microwave radiation: a pilot-scale study.
← Research streamA continuous pilot-scale microwave system (output power 4.8 kW; capacity ~5 m^3/day) was tested on real coke-plant wastewater with ammonia nitrogen concentrations of 2400–11000 mg/L. Ammonia removal could reach about 80% under the evaluated operating conditio…
Study snapshot
Abstract
A large removal of ammonia nitrogen in wastewater has been achieved by microwave (MW) radiation in our previous bench-scale study. This study developed a continuous pilot-scale MW system to remove ammonia nitrogen in real wastewater. A typical high concentration of ammonia nitrogen contaminated wastewater, the coke-plant wastewater from a Coke company, was treated. The output power of the microwave reactor was 4.8 kW and the handling capacity of the reactor was about 5m(3) per day. The ammonia removal efficiencies under four operating conditions, including ambient temperature, wastewater flow rate, aeration conditions and initial concentration were evaluated in the pilot-scale experiments. The ammonia removal could reach about 80% for the real coke-plant wastewater with ammonia nitrogen concentrations of 2400-11000 mg/L. The running cost of the MW technique was a little lower than the conventional steam-stripping method. The continuous microwave system showed the potential as an effective method for ammonia nitrogen removal in coke-plant water treatment. It is proposed that this process is suitable for the treatment of toxic wastewater containing high concentrations of ammonia nitrogen.
AI evidence extraction
Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.
Main findings
A continuous pilot-scale microwave system (output power 4.8 kW; capacity ~5 m^3/day) was tested on real coke-plant wastewater with ammonia nitrogen concentrations of 2400–11000 mg/L. Ammonia removal could reach about 80% under the evaluated operating conditions, and the running cost was reported as slightly lower than conventional steam-stripping.
Outcomes measured
- Ammonia nitrogen removal efficiency in real coke-plant wastewater
- Operating condition effects (temperature, flow rate, aeration, initial concentration) on ammonia removal
- Running cost comparison vs conventional steam-stripping
Limitations
- Microwave frequency not reported in the abstract.
- No sample size/number of runs reported in the abstract.
- Details of experimental design and quantitative results across the four operating conditions are not provided in the abstract.
View raw extracted JSON
{
"study_type": "engineering",
"exposure": {
"band": "microwave",
"source": "wastewater treatment reactor",
"frequency_mhz": null,
"sar_wkg": null,
"duration": null
},
"population": null,
"sample_size": null,
"outcomes": [
"Ammonia nitrogen removal efficiency in real coke-plant wastewater",
"Operating condition effects (temperature, flow rate, aeration, initial concentration) on ammonia removal",
"Running cost comparison vs conventional steam-stripping"
],
"main_findings": "A continuous pilot-scale microwave system (output power 4.8 kW; capacity ~5 m^3/day) was tested on real coke-plant wastewater with ammonia nitrogen concentrations of 2400–11000 mg/L. Ammonia removal could reach about 80% under the evaluated operating conditions, and the running cost was reported as slightly lower than conventional steam-stripping.",
"effect_direction": "benefit",
"limitations": [
"Microwave frequency not reported in the abstract.",
"No sample size/number of runs reported in the abstract.",
"Details of experimental design and quantitative results across the four operating conditions are not provided in the abstract."
],
"evidence_strength": "low",
"confidence": 0.74,
"peer_reviewed_likely": "yes",
"keywords": [
"microwave radiation",
"pilot-scale",
"continuous system",
"wastewater",
"ammonia nitrogen",
"coke-plant wastewater",
"removal efficiency",
"steam-stripping",
"operating conditions"
],
"suggested_hubs": []
}AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.
Identifiers and source
DOI: 10.1016/j.jhazmat.2009.02.113
PubMed: 19304377