The treatment or recovery of nutrients (N and P) from anaerobically digested supernatants is now a central topic, related both to the zootechnical wastewaters and to the supernatants from the sludge lines of urban wastewater treatment plants (WWTP), applying codigestion of excess sludge and organic fraction of municipal solid waste (OFMSW). In both cases, the crystallization and precipitation o...

OBJECTIVE To evaluate trends in urolith composition and urolithiasis in dogs during the past 21 years. DESIGN Retrospective case series. SAMPLE POPULATION 25,499 uroliths and the dogs from which they were obtained. PROCEDURES Database of the Gerald V. Ling Urinary Stone Analysis Laboratory was searched from January 1985 through December 2006. All uroliths from dogs and the accompanying su...

Chemical precipitation is a suitable method for the recovery and removal of ammonium in water and a fertilizer known as MAP (magnesium ammonium phosphate; MgNH4PO4.6H2O; struvite) is obtained. Additionally, the advantage of this method is that environmental conditions do not have any effect compared to biological methods. In this study, the recovery of ammonium (Cmean=348 mg NH4 /L ± 38.1; n=25...

Abstract A major portion of phosphatic fertilizer comes from the limiting natural resource, rock phosphate which demands a timely alternative. Struvite, crystalline mineral low solubility, is worthwhile Evaluation local wastewater streams for their ability to precipitate struvite and its capability as under an alkaline soil environment was studied. Two stirring speeds, pH range 8.0–11.0, consta...

Poor ammonia-nitrogen removal in methanogenic anaerobic reactors digesting animal manure has been reported as an important disadvantage of anaerobic digestion (AD) in several studies. Development of anaerobic processes that are capable of producing reduced ammonia-nitrogen levels in their effluent is one of the areas where further research must be pursued if AD technology is to be made more eff...

The present paper reports the results of an investigation aimed at evaluating the effectiveness of magnesium ammonium phosphate precipitation (MAP), commonly called struvite, for removing ammonia from a mature municipal landfill leachate. MAP precipitation was carried out at laboratory scale by adding phosphoric acid and magnesium oxide as external sources of phosphorus and magnesium, respectiv...

BACKGROUND Knowledge of the mineral composition of the causative urolith is important to develop preventative strategies. Advances in analytic techniques have led to detection of urolith components not previously recognized. HYPOTHESIS/OBJECTIVES The objectives of this study were to characterize uroliths in sheep and goats structurally and clinically. We hypothesized that amorphous magnesium ...

Recovery of Ammonium Nitrogen and Phosphate from the Piggery Wastewater as Struvite Its Assessment for Reduction Water Pollution Through Field Test-MgO,N,Newly-manufactured compost,NH4+-N,P,PO43--P,Struvite

PURPOSE Renal calculi are a significant source of morbidity for patients with neurogenic bladder. Calculi from patients with NB have traditionally been composed primarily of struvite and carbonate apatite secondary to chronic urea-splitting bacteriuria. In the current era there have been great improvements in the urological rehabilitation of patients with NB. We defined the composition of renal...

BACKGROUND Crystalline-matrix urethral plugs have not been previously reported in dogs. HYPOTHESIS/OBJECTIVES To report the composition of urethral plugs in dogs, describe clinical features of the disease, and identify overrepresented breeds. METHODS Retrospective case series. A Minnesota Urolith Center (MUC) record search was performed for urethral plugs in dogs submitted during a 6-year p...