Selective Precipitation of Phosphate from Semiconductor Wastewater

Warmadewanthi,; Liu, J. C.

doi:10.1061/(asce)ee.1943-7870.0000054

Cited by 24 publications

(7 citation statements)

References 27 publications

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“…These authors reached final concentrations of 5-10 mg P/L and 8-18 mg F/L from initial concentrations of 200 mg F/L and 200-400 mg P/L. Selective precipitation of phosphorus from semiconductor wastewater containing fluoride was performed using magnesium salts (Warmadewanthi and Liu, 2009). The initial wastewater contained 936 mg F/L, 118 mg P/L and other compounds.…”

Section: Resultsmentioning

confidence: 99%

“…Precipitation of CaF2 using chemical additives (Yang et al, 2011) or fluidized bed (Aldaco et al, 2005) was also documented. Selective precipitation of phosphorus or fluoride from specific wastewaters containing both components was performed using staged chemical processes (Grzmil and Wronkowski, 2006;Warmadewanthi and Liu, 2009;Yang et al, 2001). The utilization of passive slag filters for single-metal removal was documented in several studies (Smyth et al, 2002;Renman et al, 2009), but further work is needed to assess the capacity of such systems to treat wastewaters containing phosphorus, fluoride and metals.…”

Section: Introductionmentioning

confidence: 99%

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Removal of phosphorus, fluoride and metals from a gypsum mining leachate using steel slag filters

2013

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The objective of this work was to evaluate the capacity of steel slag filters to treat a gypsum mining leachate containing 11-107 mg P/L ortho-phosphates, 9-37 mg/L fluoride, 0.24-0.83 mg/L manganese, 0.20-3.3 zinc and 1.7-8.2 mg/L aluminum. Column tests fed with reconstituted leachates were conducted for 145-222 days and sampled twice a week. Two types of electric arc furnace (EAF) slags and three filter sequences were tested. The voids hydraulic retention time (HRT(v)) of columns ranged between 4.3 and 19.2 h. Precipitates of contaminants present in columns were sampled and analyzed with X-ray diffraction at the end of tests. The best removal efficiencies over a period of 179 days were obtained with sequential filters that were composed of Fort Smith EAF slag operated at a total HRT(v) of 34 h which removed 99.9% of phosphorus, 85.3% of fluoride, 98.0% of manganese and 99.3% of zinc. Mean concentration at this system's effluent was 0.04 mg P/L ortho-phosphates, 4 mg/L fluoride, 0.02 mg/L manganese, 0.02 zinc and 0.5 mg/L aluminum. Thus, slag filters are promising passive and economical systems for the remediation of mining effluents. Phosphorus was removed by the formation of apatite (hydroxyapatite, Ca(5)(PO(4))(3)OH or fluoroapatite, Ca(5)(PO(4))(3)F) as confirmed by visual and X-ray diffraction analyses. The growth rate of apatite was favored by a high phosphorus concentration. Calcite crystals were present in columns and appeared to be competing for calcium and volume needed for apatite formation. The calcite crystal growth rate was higher than that of apatite crystals. Fluoride was removed by precipitation of fluoroapatite and its removal was favored by a high ratio of phosphorus to fluoride in the wastewater.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Removal of phosphorus, fluoride and metals from a gypsum mining leachate using steel slag filters

2013

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“…Analysis via XRD showed that the pattern baseline was quite high (Fig. 2a), indicating that the precipitates were mainly composed by amorphous compounds (Warmadewanthi and Liu, 2009). Further, the Mg:P ratio was 1.48 in the precipitates.…”

Section: Equilibrium Of Precipitation Reactionsmentioning

confidence: 96%

The precipitation of magnesium potassium phosphate hexahydrate for P and K recovery from synthetic urine

Zheng

et al. 2015

Water Research

116

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“…Fertilizers are organic or inorganic, either synthetic or natural materials that are added to the soil to provide important nutrients for plant growth [1]. However, in the process of fertilizer production, the fertilizer industries produce wastewater that has a high level of ammonium and phosphate [2]. A high concentration of phosphate in wastewater will be very dangerous if disposed directly to the environment, because it may cause eutrophication in surface water [3].…”

Section: Introductionmentioning

confidence: 99%

“…Struvite crystallization kinetics shows that struvite formation is best in a high mixing energy condition, and FBR has the excellent mixing energy required [20]. Some factors that can affect the struvite crystallization process in FRB are the degree of saturation of the solution, the flow rate through the reactor, stirring, molar ratio, pH, impurities ions, and seed materials [2,10,12,21]. The utilization of struvite as a fertilizer is highly dependent on the size of the crystal particles.…”

Section: Introductionmentioning

confidence: 99%

Study of struvite crystallization from fertilizer industry wastewater by using fluidized bed reactor

Warmadewanthi

Bachtiar

2019

MATEC Web Conf.

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The fertilizer industry produces wastewater containing 9815 mg/L of phosphates and 2558 mg/L of ammonium, which may cause eutrophication if untreated. Wastewater that contains a large amount of phosphate can become a potential source of phosphate which is depleting on a global scale. Fluidized bed reactors are an effective method of phosphate recovery by producing struvite crystals. This study evaluates the effects of the upflow velocity on the performance of the fluidized bed and analyzes the struvite that is recovered. The experiment was conducted in laboratory scale at room temperature. Fertilizer industry wastewater and MgCl2 were added into fluidized bed reactors at 0.014, 0.019, and 0.0024 m/s upflow velocity. The operating pH was 8.5±0.2. Inside the reactors was sand No. 30/60 that worked as a seed material. The result showed that fluidized bed reactors could recover phosphate up to 73% and ammonium up to 57% at 0.014 m/s upflow velocity. Increasing the upflow velocity at intervals of 0.005 m/s could decrease the phosphate recovery by 1-2% and ammonium by 3-4%. SEM-EDX analysis showed that products were attached to the seed material, which contained N, P, Mg, O, Ca, F, and Si as the main constituent elements. The recovered products contain 60.2% of struvite, which mainly works as a slow released fertilizer.

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Selective Precipitation of Phosphate from Semiconductor Wastewater

Cited by 24 publications

References 27 publications

Removal of phosphorus, fluoride and metals from a gypsum mining leachate using steel slag filters

Removal of phosphorus, fluoride and metals from a gypsum mining leachate using steel slag filters

The precipitation of magnesium potassium phosphate hexahydrate for P and K recovery from synthetic urine

Study of struvite crystallization from fertilizer industry wastewater by using fluidized bed reactor

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