Size-dependent growth kinetics of struvite crystals in wastewater with calcium ions

Growth Rate Kinetics for Struvite Crystallisation

The crystallisation of struvite is one means of removing phosphate (and nitrogen) from nutrient-rich wastewater. As with all crystallisation processes, the growth rate of the crystals and its dependence on supersaturation is of considerable interest in designing processing equipment. Modelling of struvite solubility using the computer package MINTEQA2 showed that struvite exhibits a minimum sol...

Modeling and Optimization of Phosphate Recovery from Industrial Wastewater and Precipitation of Solid Fertilizer using Experimental Design Methodology

Phosphorus (P) is one of the primary nutrients generating eutrophication in aquatic systems1. To prevent eutrophication, municipal or agricultural wastewaters are treated to reduce the phosphorus concentrations in the wastewater reaching surface water streams. While unregulated P is a pollutant in a water body, phosphorous is a useful resource in agricultural fertilizers, food supply, and indus...

Growth Characterization of Calcium Hydrogen Phosphate Dihydrate, Calcium Oxalate Monohydrate and Struvite Crystals Influenced by Medicinal Plants

Mineral speciation determination and quantitative x-ray analysis of struvite family crystals precipitated in wastewater

Mineral speciation of struvite family crystals precipitated in a synthetic wastewater containing Mg: NH : PO3 (MAP) ions were determined in the study. The pH levels by KOH addition and MAP ratios were set up to be the parameter dependence on struvite family crystals precipitation. The Rietveld analysis of XRPD pattern confirmed a mixed product of struvite, struvite-(K) and newberyite precipitat...

Size-dependent Kinetics Determination of MoS2-K2O/CNTS Nanocatalyst in the Synthesis of Alcohols from Syngas

The influence of Mo particle size on the catalytic activity and product selectivity of alkalized MoS2 nanocatalysts has been investigated. Nanocatalysts are prepared using a microemulsion technique with water-to-surfactant ratios of 1-12. Three different techniques, including XRD, TEM, and hydrogen chemisorption were used to determine the molybdenum average particle size and their activity and ...