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Evaluating Microbial and Chemical Hazards in Commercial Struvite Recovered from Wastewater.

08:00 EDT 9th April 2019 | BioPortfolio

Summary of "Evaluating Microbial and Chemical Hazards in Commercial Struvite Recovered from Wastewater."

Controlled struvite (NH4MgPO4·6H2O) precipitation has become a well-known process for nutrient recovery from wastewater treatment systems to alleviate the pressures of diminishing, finite rock phosphate reservoirs. Nonetheless, co-precipitation of potential microbial and chemical hazards is poorly understood. On the other hand, antibiotic resistance is a major global public health concern and wastewater is thought to disseminate resistance genes within bacteria. Focusing on struvite produced from full-scale operations, culture and qPCR methods were utilized to identify fecal indicator bacteria, antibiotic resistance genes and human enteric viruses in the final product. Detection of these hazards occurred in both wet and dry struvite samples indicating that there is a potential risk that needs further consideration. Chemical and biological analyses support the idea that the presence of other wastewater components can impact struvite formation through ion and microbial interference. While heavy metal concentrations met current fertilizer standards, the presence of K, Na, Ca and Fe ions can impact struvite purity yet provide benefit for agricultural uses. Additionally, the quantified hazards detected varied among struvite samples produced from different methods and sources, thus indicating that production methods could be a large factor in the risk associated with wastewater-recovered struvite. In all, co-precipitation of metals, fecal indicator bacteria, antimicrobial resistance genes and human enteric viruses with struvite was shown to be likely and future engineered wastewater systems producing struvite may require additional step(s) to manage these newly identified public health risks.

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Name: Environmental science & technology
ISSN: 1520-5851
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The mineral magnesium ammonium phosphate with the formula NH4MgPO4. It is associated with urea-splitting organisms in a high magnesium, high phosphate, alkaline environment. Accumulation of crystallized struvite is found in the urinary tract as struvite CALCULI and as scale on sewage system equipment and wastewater pipes.

Light absorbing proteins and protein prosthetic groups found in certain microorganisms. Some microbial photoreceptors initiate specific chemical reactions which signal a change in the environment, while others generate energy by pumping specific ions across a cellular membrane.

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The homogeneous mixtures formed by the mixing of a solid, liquid, or gaseous substance (solute) with a liquid (the solvent), from which the dissolved substances can be recovered by physical processes. (From Grant & Hackh's Chemical Dictionary, 5th ed)

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