struvite removal 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

  • 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

  • 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 ...


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  • 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

  • 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

  • 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 ...

  • 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

  • Struvite and Vivianite Screw Presses and Heat Exchanger Removal case study

    A regional wastewater treatment plant in Sonoma County was experiencing problems with struvite on their screw presses and vivianite on their heat exchangers. The design plant flow rate is 7.9 mg/day. They were using 7 mg/L to 10 mg/L (dry basis) of ferric chloride to control hydrogen sulfide and improve solids removal in the primary clarifier. The plant maintenance staff was forced to shut down ...


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  • 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

  • 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 ...

  • 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

  • Removal of ammonium from rare-earth wastewater using natural brucite as a magnesium source of struvite precipitation

    This paper presents a study regarding ammonium removal from rare-earth wastewater by struvite precipitation with natural brucite mineral as a source of magnesium. Experimental results indicated that a pH ranging from 8.5 to 9.5 was the optimum for the removal of ammonium using the soluble form of brucite as a magnesium source. Additionally, when solid brucite was used as a magnesium source as ...


    By IWA Publishing

  • Ammonium removal from wastewater via struvite pyrolysate recycling with Mg(OH)2 addition

    Magnesium ammonium phosphate (MAP) pyrolysate recycling technology was investigated with Mg(OH)2-mediated pyrolysis. The results revealed that the removal ratio of ammonium was stable at about 75%, and could be increased to 79% after additional acidolysis. The phosphate concentration in the supernate was low at 2 mg/L. The optimum conditions for ammonia release were a 1:1 molar ...


    By IWA Publishing

  • Phosphate removal in agro-industry: Pilot- and full-scale operational considerations of struvite crystallization

    Pilot-scale struvite crystallization tests using anaerobic effluent from potato processing industries were performed at three different plants. Two plants (P1 & P2) showed high phosphate removal efficiencies, 89+/-3% and 75+/-8%, resulting in final effluent levels of 12+/-3mgPO(4)(3-)-PL(-1) and 11+/-3mgPO(4)(3-)-PL(-1), respectively. In contrast, poor phosphate removal (19+/-8%) was obtained ...


  • Removal of ammonium from aqueous solutions using the residue obtained from struvite pyrogenation

    This paper reports the results of laboratory studies on the removal of ammonium from aqueous solutions using struvite pyrogenation residues. A series of experiments were conducted to examine the effects of the pyrogenation temperature (90–210 °C) and time (0.5–4 h) on the ammonium release of struvite. In addition, the pyrolysate of struvite produced at different pyrogenation temperatures and ...


    By IWA Publishing

  • Ammonia nitrogen removal from acetylene purification wastewater from a PVC plant by struvite precipitation

    Acetylene purification wastewater (APW) usually contains high concentrations of ammonia nitrogen (NH4-N), which is generated during the production of acetylene in a polyvinylchloride manufacturing plant. In this study, a struvite precipitation method was selected to remove NH4-N from the APW. Laboratory-scale batch experiments were performed to investigate the effects of the initial APW ...


    By IWA Publishing

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