Abstract
Phosphorus recovery from industrial wastewater has attracted considerable interest. In this study, struvite crystallization method has been used for treatment of high phosphorus wastewater. The new combination agents of Mg5(CO3)4(OH)2·4H2O and NH4Cl were used as the precipitant. The effects of initial pH, n(Mg):n(P), n(N):n(P), and reaction time on the removal of total phosphorus (TP) in wastewater were investigated. The results showed that under the condition of initial pH = 4, Mg:N:P = 1.2:1.1:1, reaction time for 30 min, and static storage for 20 min, the residual amount of TP in wastewater was 2.98 mg /L, and the removal rate of TP reached 99.99%. The mass fraction of P2O5 in the generated sediment reached 25.22%, equivalent to high grade phosphate ore and slow-release fertilizer, so as to realize the recycling and utilization of phosphorus in ultra-high phosphorous wastewater. This work will have practical application potential in treatment of high phosphorus wastewater and environmental management.
Highlights
Nowadays, with the increasing demand for aluminum and its alloys in the world, the surface treatment processes, such as phosphating, are often used to protect the surface of materials from oxidation and corrosion [1,2]
The main aim of this work is studying the factors affecting the recovery of phosphorus in acidic ultrahigh-phosphorus wastewater by struvite crystallization, such as the proportion of reactant materials, initial pH, and reaction time
The group of reagents of Mg5 (CO3 )4 (OH)2 ·4H2 O and NH4 Cl was selected in consideration of the fact that Mg5 (CO3 )4 (OH)2 ·4H2 O can be dissolved in dilute acid and neutralize the acid in solution to a greater extent than the ammonium radical hydrolysis to produce hydrogen
Summary
With the increasing demand for aluminum and its alloys in the world, the surface treatment processes, such as phosphating, are often used to protect the surface of materials from oxidation and corrosion [1,2]. The phosphating process contains a series of chemical reactions, and lots of acidic ultra-high phosphorous wastewater was produced [3]. The composition of phosphating wastewater produced in the processing of aluminum profiles is complex, and direct discharge will seriously pollute the surrounding ecological environment [4]. The removal of phosphorus from wastewater is of great significance for environmental protection. Current methods for phosphorus removal include biological method, physical adsorption method, electrodialysis method, ion exchange method, chemical precipitation method, etc., [6].
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