struvite Articles

  • Struvite Formation & Struvite Wastewater Treatment

    The three chemical components for Struvite formation are magnesium, ammonia and phosphorus, also known as MAP for short. Struvite’s chemical formula is NH4MgPO4·6H2O. WWTP managers have used a number of different products and techniques for Struvite removal, and to prevent Struvite formation. Most text books on Struvite control talk about the use of ferric chloride (FeCl3) to control ...


    By Struvite Removal

  • Struvite Formation, Prediction and Locations.

    Struvite formation occurs when magnesium, ammonium and phosphate hexahydrate whose elemental composition of magnesium ammonia and phosphate forms in water combine in the exact chemical formulation as expressed by equation Mg2+ + NH4+ + HPO42- + 2H2O MgNH4PO4•6H2O + H+. This is the chemical term and formulation for struvite. This article goes over how Struvite is formed, the parameters for ...


    By Struvite Removal

  • Removing Struvite from wastewater systems

    Named after Henrich Christian Gottfried Von Struve, who discovered the magnesium ammonium phosphate crystals in medieval sewer systems in Hamburg in 1845, struvite is a major problem for waste water treatment plants. The hard, crystalline deposit forms scale on lines and belts, in centrifuges and pumps.  It also clogs system pipes and other equipment including anaerobic ...

  • Struvite belt press removal case study

    A wastewater treatment plant near Flagstaff, AZ was experiencing problems with keeping their belt aligned on the belt press. The belt press was in operation 4 days per week for 6 hours per day. The flow rate was 150 gallons per minute (gpm). Upon close inspection of the belt press system, the maintenance staff observed scale deposits on the rollers, pan and filtrate lines. Samples were taken for ...


    By Struvite Removal

  • Nutrient Recovery by Struvite Crystallization Process: Virginia Experience

     ABSTRACT The Hampton Roads Sanitation District's (HRSD), Nansemond Treatment plant (NTP) services the cities of Chesapeake, Portsmouth and Suffolk, Virginia. The plants treated effluent is discharged into the Chesapeake Bay watershed. The NTP was designed as a 30 MGD biological nutrient removal (BNR) plant with seasonal nitrification and utilizes anaerobic digestion for solids ...

  • Recovery of nitrogen from saponification wastewater by struvite precipitation

    In general, saponification wastewater produced from the separation process of rare-earth elements contains high ammonium concentration. In this study, a series of experiments were conducted to investigate the parameters to enhance the struvite precipitation potential for ammonium removal from the wastewater having an ammonium concentration of 4,100 mg/L. Experimental results showed that ...


    By IWA Publishing

  • Quantifying struvite formation in Calgary’s wastewater treatment system

    The paper presents a sampling and sample preparation protocol to evaluate struvite formation in the solids processing train of a wastewater treatment plant. The protocol was applied to the City of Calgary’s Bonnybrook and Fish Creek WWTP’s and the Shepard Sludge Lagoons. The soluble and particulate portions of magnesium, nitrogen and phosphorus (the chief components of struvite), as well as ...

  • Struvite screw presses removal trial case study

    Based on the lab supervisor’s recommendation, the plant ordered two 55 gallon drums of JS 9325 for a plant trial on the screw press. They set up a spray system to meter JS 9325 on the outer surface of the screw press. During the first five (5) days of the struvite removal trial, plant operations noticed that the openings on the screens were getting cleaner. They reduced the cleaning cycle ...


    By Struvite Removal

  • How to Remove Struvite from Wastewater Treatment Plant

    There is an alternative method for removing struvite that is much easier to administer and control than mechanical grinding and spraying. JS 9325 is a liquid solution, environmentally safe product that has proven itself to remove struvite effectively, efficiently and cost friendly. JS 9325 is very effective with struvite removal and struvite wastewater treatment. JS 9325 will safely attack and ...


    By Struvite Removal

  • How to Control Struvite and Vivianite - Case Study

    This article is a brief overview on the formation of struvite and vivianite and methods that have been used to prevent and remove ...


    By Jenfitch, LLC

  • Influence of reagent choice on strategies of nutrient recovery by struvite crystallisation

    Two different approaches of magnesium ammonium phosphate (MAP) crystallisation were compared. Anaerobically treated wastewater containing high phosphate levels (100 to 120 mg PO4 3- - P/l) was shown to be treated most efficiently using air stripping combined with MgCl2 and NaOH reagent addition. Residual PO4 3- -P was 8 to 15 mg PO4 3- -P/l yielding 1 to 2,5 mm spherical pure MAP crystals. At ...


  • A Struvite Control and Phosphorus Removal Process for Centrate: Full-Scale Testing

    ABSTRACTThe North End Water Pollution Control Centre (NEWPCC) in Manitoba, Canada serves a population of approximately 380,000. The dry weather flow to the NEWPCC is approximately 175 ML/d (46 MGD). The plant uses anaerobic digestion and centrifuge dewatering in its solids treatment train. The centrate stream comprises approximately 20 percent of the plant’s phosphorus load. The plant suffers ...

  • Effect of magnesium dose on amount of pharmaceuticals in struvite recovered from urine

    Phosphorus (P) recovery was carried out through struvite precipitation from urines. Human urine, however, contains not only high nutrients for plants, such as P and nitrogen, but also pharmaceuticals and hormones. In this work, effects of magnesium (Mg) dose (in terms of Mg:P ratio) on P recovery efficiency and pharmaceutical amounts contained in struvite were investigated. Batch-scale ...


    By IWA Publishing

  • Experimental design for the evaluation of struvite sedimentation obtained from an ammonium concentrated wastewater

    Chemical precipitation of struvite as a technique of ammonium nitrogen (NH4-N) removal from concentrated wastewater has been shown to be an attractive alternative due to its high effectiveness, reaction rate, simplicity, environmental sustainability and, especially, the application potential of the generated solids for the fertilizer industry. The technique of experimental design has been used ...


    By IWA Publishing

  • Modelling and dynamic simulation of struvite precipitation from source-separated urine

    A model of a mixed-mode nutrient recovery reactor is developed for a urine feed, incorporating complex solution thermodynamics, dynamic conservation relations and a power-law kinetic expression for crystal growth from seed crystals. Simulations at nominal operating conditions predict phosphorus recoveries greater than 99%, based on existing process kinetic parameters and operating ...


    By IWA Publishing

  • Effect of magnesium dose on amount of pharmaceuticals in struvite recovered from urine

    Phosphorus (P) recovery was carried out through struvite precipitation from urines. Human urine, however, contains not only high nutrients for plants, such as P and nitrogen, but also pharmaceuticals and hormones. In this work, effects of magnesium (Mg) dose (in terms of Mg:P ratio) on P recovery efficiency and pharmaceutical amounts contained in struvite were investigated. Batch-scale ...


    By IWA Publishing

  • Struvite Removal & Vivianite Removal Case Study- Heat Exchanger and Screw Press

    A regional wastewater treatment plant in Sonoma County was experiencing problems with struvite on their screw presses and vivianite on their heat exchangers.The plant maintenance staff was forced to shut down the dewatering process every three (3) weeks to clean because of struvite deposits on the screen of the screw press. They also noticed that they were having a difficult time maintaining ...


    By Struvite Removal

  • Phosphorus removal from anaerobically digested swine wastewater through struvite precipitation

    Phosphorus removal from agricultural wastewater streams is an important aspect of managing surface water quality, due to the contribution of phosphorus to eutrophication. Removal of phosphorus through struvite precipitation allows for its recovery as a potential fertilizer, and by determining the best conditions for struvite precipitation the removal process can be optimized. The effects of pH, ...


    By IWA Publishing

  • Nitrogen removal and recovery from human urine by struvite precipitation

    In this study, struvite precipitation of human urine was experimentally studied on both synthetic and actual urine samples. One of the main conclusions of the study was that removal of the ions constituting struvite from the solution was not in proportion with the stoichiometry of the solid and excess magnesium and phosphate removals varied from 2.5% to 4.8% on a molar basis. Redissolution of the ...


    By Inderscience Publishers

  • JS 9325 Struvite Remover centrifuge cleaning case study

    This is a study conducted using JS 9325 Struvite Remover on the outer shell of a centrifuge. In this study, they want to use JS 9325 Struvite Remover on the deposits and keep the buildup soft and easy to remove. Using JS 9325 Struvite Remover in a Hudson sprayer daily, they were able to keep the centrifuge clean. The study conducted was a total of 10 days with great changes noticed in the ...


    By Struvite Removal

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