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Phosphate often needs to be removed from wastewater because it will cause eutrophication of receiving waters. At the Paso Robles Wastewater Treatment plant, they add MgCl2 to the pressate (concentrated liquid pressed from sludge) to precipitate phosphate as the mineral struvite. Struvite is formed by the reaction of phosphate with magnesium ions and ammonium, and the solubility product for struvite is 5.5x10-14. The ammonium concentration is very high at 300 mg N-NH4/L because the sludge is coming from an anaerobic digester. What minimum amount of MgCl2 (in mg/L) would be needed to precipitate all but 1 mg/L phosphate? Struvite precipitates by the following reaction: Mg++NH] +PO →MgNH PO 4 4 4

Phosphate often needs to be removed from wastewater because it will cause eutrophication of receiving waters. At the Paso Robles Wastewater Treatment plant, they add MgCl2 to the pressate (concentrated liquid pressed from sludge) to precipitate phosphate as the mineral struvite. Struvite is formed by the reaction of phosphate with magnesium ions and ammonium, and the solubility product for struvite is 5.5x10-14. The ammonium concentration is very high at 300 mg N-NH4/L because the sludge is coming from an anaerobic digester. What minimum amount of MgCl2 (in mg/L) would be needed to precipitate all but 1 mg/L phosphate? Struvite precipitates by the following reaction: Mg++NH] +PO →MgNH PO 4 4 4

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Phosphate often needs to be removed from wastewater because it will cause eutrophication of receiving waters. At the Paso Robles Wastewater Treatment plant, they add MgCl2 to the pressate (concentrated liquid pressed from sludge) to precipitate phosphate as the mineral struvite. Struvite is formed by the reaction of phosphate with magnesium ions and ammonium, and the solubility product for struvite is 5.5x10-14. The ammonium concentration is very high at 300 mg N-NH4/L because the sludge is coming from an anaerobic digester. What minimum amount of MgCl2 (in mg/L) would be needed to precipitate all but 1 mg/L phosphate? Struvite precipitates by the following reaction: Mg++NH] +PO →MgNH PO 4 4 4
Transcribed Image Text:Phosphate often needs to be removed from wastewater because it will cause eutrophication of receiving waters. At the Paso Robles Wastewater Treatment plant, they add MgCl2 to the pressate (concentrated liquid pressed from sludge) to precipitate phosphate as the mineral struvite. Struvite is formed by the reaction of phosphate with magnesium ions and ammonium, and the solubility product for struvite is 5.5x10-14. The ammonium concentration is very high at 300 mg N-NH4/L because the sludge is coming from an anaerobic digester. What minimum amount of MgCl2 (in mg/L) would be needed to precipitate all but 1 mg/L phosphate? Struvite precipitates by the following reaction: Mg++NH] +PO →MgNH PO 4 4 4
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