In four patients with alkaline-encrusted cystitis, Corynebacterium group D2 was isolated from consecutive urine cultures and stones. Encrusted cystitis occurred in bladders harboring inflammatory or tumorous lesions in patients with chronic or recurrent urinary tract infections appearing after surgery or instrumentation. The urease activity of Corynebacterium group D2 and the neutralization of ...

Feline urolithiasis represents 15% of all cases of nonobstructive lower urinary tract disease in cats. Approximately 50% of feline uroliths are composed of struvite. Struvite urolithiasis commonly recurs, but optimal management may decrease its frequency. The pathophysiology and management of struvite urolithiasis are different in cats and dogs. This article focuses on struvite urolithiasis in ...

Declining earth resources, rising ore cost and increasing pollution are calling for recycling of wastewater in the context circular economy. In particular, urine is a potential source phosphorus (P) potassium (K), yet currently available methods P K recovery limited efficiency. Here, we designed an electrochemical crystallization system using sacrificial magnesium anodes to recover form K-struv...

-In this paper struvite formation and crystal forms in anaerobic digesters under differing feed types and support media have been studied. Struvite appears when the medium contains magnesium, ammonium and phosphate ions. NH + can be supplied from protein degradation, phosphate from bacterial exudation and Mg 2+ by the supports. The precipitation of struvite has also been checked with real feedi...

Struvite is the most common canine urolith. Struvite uroliths form when urine is supersaturated with magnesium, ammonium, and phosphate. Saturation is usually associated with a bacterial urinary tract infection (UTI) with urease-producing bacteria such as Staphylococcus species or, less commonly, Proteus species. Infections are particularly common in female and young dogs. Medical dissolution o...

A demonstration crystallization reactor and struvite accumulation device for the removal and recovery of phosphorous was constructed and their performance was evaluated using actual swine wastewater for 3.5 years. The wastewater pH was increased by aeration, and the concentrations of total P and soluble PO(4)-P were reduced by a struvite crystallization reaction induced under a high pH conditio...

A computer model was developed and tested to predict struvite precipitation mass potential. The model validity was tested using results from a fluidized bed precipitation reactor processing wastewater treatment plant sludge liquor. Increasing interest in controlled struvite precipitation to protect wastewater treatment infrastructure and to harvest nitrogen and phosphorus from wastewater will m...

In this study, the recovery of heavy metal (Cu2+, Pb2+, and Zn2+) concentrations and the yield of struvite from MAP precipitation in the wastewater were optimized by SRM (surface response methodology). Struvite was a major mineral precipitated with an impurity of sylvite (KCl) as confirmed by the XRPD Rietveld method, and struvite crystal has a prism-like shape morphology according to the SEM/E...