{
    "title": "Submerged Ammonia Removal System and Method",
    "inventor_name": "Kraig Johnson (et al.)",
    "publication_year": 2008,
    "device_name": "PooGloo",
    "goal": "Remove ammonia from wastewater efficiently and reduce the cost of sewage treatment.",
    "problem_addressed": "Conventional lagoon systems fail to remove ammonia, leading to pollution violations and high capital costs for mechanical treatment plants.",
    "concept_summary": "A submerged, non-vertical panel system coated with a bio-film of nitrifying bacteria. Aeration creates air bubbles that travel along the panels, providing oxygen, circulating water, and shielding the bio-film from sunlight to enhance nitrification and ammonia removal.",
    "detailed_description": "The invention consists of a series of submerged surfaces (panels, hemispherical or pyramidal modules) placed in a wastewater lagoon. The surfaces are oriented to block direct sunlight and are colonised by nitrifying bacteria that convert ammonia (NH_4^+) to nitrate. An aeration system injects air at the lower end of the panels; bubbles rise along the surface, creating aerobic conditions and inducing water circulation. This design increases the available surface area for bacterial growth, improves oxygen transfer, and reduces algae competition, resulting in faster and cheaper ammonia removal compared with traditional lagoons. Laboratory batch tests demonstrated measurable ammonia reduction over time, and a pilot installation in Plain City, Utah, is projected to cost roughly $100,000 versus a $13 million conventional plant.",
    "category": "Mechanical Engineering",
    "principles": [
        "Bio-film attachment",
        "Nitrification",
        "Aeration",
        "Surface-area maximisation",
        "Sunlight shielding"
    ],
    "scientific_domains": [
        "Environmental Engineering",
        "Microbiology",
        "Chemical Engineering",
        "Water Treatment"
    ],
    "mechanisms_of_action": [
        "Nitrifying bacteria oxidise ammonia to nitrate under aerobic conditions",
        "Air bubbles provide oxygen and induce water flow over the bio-film",
        "Shading reduces algae growth that would otherwise out-compete nitrifiers"
    ],
    "materials": [
        "plastic",
        "foam",
        "metal"
    ],
    "energy_sources": [
        "electricity"
    ],
    "inputs": [
        "Wastewater containing ammonia",
        "Compressed air (aeration)"
    ],
    "outputs": [
        "Treated water with reduced ammonia concentration",
        "Nitrate-rich effluent"
    ],
    "claimed_performance": "Significant ammonia reduction; treatment cost projected at $100,000 versus $13 million for a conventional plant; faster treatment cycles allowing reduction of lagoon count by half.",
    "experimental_evidence": "Laboratory batch tests (Figures 10-11) showed ammonia concentration decreasing over time; a full-scale pilot in Plain City, Utah, is being filled and observed.",
    "replication_status": "Lab-tested and pilot-scale demonstration; no independent commercial replication reported.",
    "keywords": [
        "ammonia removal",
        "bio-film",
        "aeration",
        "submerged panels",
        "wastewater treatment",
        "PooGloo"
    ],
    "related_technologies": [
        "Trickling filters",
        "Rotating Biological Contractors",
        "Lagoons"
    ],
    "controversy_level": "low",
    "confidence_score": 0.9,
    "practicability_score": 0.8,
    "fringe_score": 0.1,
    "evidence_strength": 0.6,
    "risk_score": 0.2,
    "trl_estimate": 5,
    "source_urls": [
        "http://www.ksl.com/?nid=148&sid=4974856&autostart=y",
        "https://patents.google.com/patent/US7008539"
    ],
    "organizations": [
        "University of Utah"
    ],
    "applications": [
        "Municipal wastewater treatment",
        "Rural lagoon upgrades",
        "Animal feedlot wastewater management"
    ],
    "limitations": [
        "Requires continuous aeration power",
        "Performance dependent on temperature (>11  deg C)",
        "Potential fouling of panel surfaces",
        "Scaling to large lagoons may need extensive panel infrastructure"
    ],
    "open_questions": [
        "Long-term durability of panel materials in corrosive wastewater",
        "Cost-benefit analysis at full commercial scale",
        "Optimal panel geometry for maximum nitrification",
        "Maintenance requirements for bio-film health"
    ],
    "red_flags": [],
    "evidence_quotes": [
        "The result is faster, cheaper sewage treatment.",
        "They figured it would be right around $13 million. And this is going to cost us $100,000.",
        "The system includes a surface substantially submerged in the water, having a bio-film of nitrifying bacteria thereon.",
        "Air bubbles travel along the surface as they rise to create aerobic conditions.",
        "Figure 10 shows ammonia removal over time in a batch process test."
    ]
}