scholarly journals Phosphorus Recovery from Excess Sludge with Subcritical Water Process and Magnesium Ammonium Phosphate Process

2005 ◽  
Vol 16 (4) ◽  
pp. 309-317
Author(s):  
Mitsuhiro Arakane ◽  
Tsuyoshi Imai ◽  
Sadaaki Murakami ◽  
Masami Takeuchi ◽  
Masao Ukita ◽  
...  
Keyword(s):  
Subcritical Water ◽  
Ammonium Phosphate ◽  
Phosphorus Recovery ◽  
Excess Sludge ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium

Resource recovery from excess sludge by subcritical water combined with magnesium ammonium phosphate process

2006 ◽  
Vol 54 (9) ◽  
pp. 81-86 ◽  
Author(s):  
M. Arakane ◽  
T. Imai ◽  
S. Murakami ◽  
M. Takeuchi ◽  
M. Ukita ◽  
...  
Keyword(s):  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Subcritical Water ◽  
New Technology ◽  
Ammonium Phosphate ◽  
Municipal Wastewater Treatment ◽  
Excess Sludge ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium ◽  
Municipal Wastewater Treatment Plants

The amount of excess sludge produced in municipal wastewater treatment plants in Japan is increasing every year as the urban population increases. Phosphorus in excess sludge could be a potential phosphorus resource since at present, phosphate rock is being exhausted all over the world. Every year, Japan imports large quantities of phosphorus from abroad but much is discharged as excess sludge. Therefore, the solubilization process, one method of recovering phosphorus from sludge, could be a promising solution. In this study, a subcritical water process, a new technology that solubilizes sludge under subcritical conditions, was applied before the phosphorus in sludge was recovered with the magnesium ammonium phosphate (MAP) process. As a result, the solubilization rate of excess sludge achieved approximately 80% and about 94–97% of the phosphorus could be recovered.

scholarly journals Resource Recovery from Excess Sludge by Subcritical Water Process with Magnesium Ammonium Phosphate Process

2005 ◽  
Vol 3 (1) ◽  
pp. 119-124 ◽  
Author(s):  
Mitsuhiro Arakane ◽  
Tsuyoshi Imai ◽  
Sadaaki Murakami ◽  
Masami Takeuchi ◽  
Masao Ukita ◽  
...  
Keyword(s):  
Subcritical Water ◽  
Ammonium Phosphate ◽  
Resource Recovery ◽  
Excess Sludge ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium

Phosphorus recovery as struvite from eutropic waters by XDA-7 resin

2012 ◽  
Vol 65 (12) ◽  
pp. 2091-2097 ◽  
Author(s):  
Huanwen Li ◽  
Zhiping Ye ◽  
Ying Lin ◽  
Fengying Wang
Keyword(s):  
Ammonium Phosphate ◽  
Phosphorus Recovery ◽  
Phosphate Adsorption ◽  
Nacl Solution ◽  
Acid Dissolution ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium ◽  
Struvite Precipitation ◽  
Ph Range ◽  
Removal And Recovery

Phosphorus releases into aquatic environment and its subsequent contribution to eutrophication have resulted in a widespread global pollution issue. However, phosphorus is a non-renewable source. The potential supplies of phosphorus are decreasing worldwide. Therefore, removal and recovery of phosphorus from the eutropic waters is important, emergent and necessary. In this research, experiments for recovering phosphate from eutropic waters by anion exchange combined with struvite precipitation were conducted. The results indicated that the prepared XDA-7 resin was an effective adsorbent for phosphate. The adsorption isotherm of XDA-7 resin was found to be a modified Freundlich type. The maximum phosphate adsorption (20.9 mg/g) occurred in the pH range of 6.0–8.0. Phosphate adsorbed on the XDA-7 resin was effectively desorbed with 8% NaCl solution, and the resin was able to be regenerated with 3% NaClO and 4% NaOH solutions. Phosphate desorbed from the resin was recovered as magnesium ammonium phosphate (struvite). The obtained struvite was analyzed by acid dissolution method, scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR). The struvite precipitate was found to be 75.8% in purity, a high-value fertilizer.

Phosphorus recovery from anaerobic digester supernatant by struvite crystallization: model-based evaluation of a fluidized bed reactor

2008 ◽  
Vol 58 (6) ◽  
pp. 1321-1327 ◽  
Author(s):  
M. S. Rahaman ◽  
D. S. Mavinic ◽  
N. Ellis
Keyword(s):  
Fluidized Bed ◽  
Plug Flow ◽  
Ammonium Phosphate ◽  
Phosphorus Recovery ◽  
Reactor Performance ◽  
Magnesium Ammonium Phosphate ◽  
University Of British Columbia ◽  
Magnesium Ammonium ◽  
Struvite Crystallization ◽  
Anaerobic Digester Supernatant

This paper is an attempt to model the UBC (University of British Columbia) MAP (Magnesium Ammonium Phosphate) fluidized bed crystallizer. A mathematical model is developed based on the assumption of perfect size classification of struvitre crystals in the reactor and considering the movement of liquid phase as a plug flow pattern. The model predicts variation of species concentration of struvite along the crystal bed height. The species concentrations at two extreme ends (inlet and outlet) are then used to evaluate the reactor performance. The model predictions provide a reasonable good fit with the experimental results for both PO4—P and NH4—N removals. Another important aspect of this model is its capability of predicting the crystals size and the bed voidage at different height of the reactor. Those predictions also match fairly well with the experimental observations. Therefore, this model can be used as a tool for performance evaluation of the reactor and can also be extended to optimize the struvite crystallization process in the UBC MAP reactor.

Development of a process for the recovery of phosphorus resource from digested sludge by crystallization technology

2008 ◽  
Vol 57 (3) ◽  
pp. 451-456 ◽  
Author(s):  
K. Shimamura ◽  
H. Ishikawa ◽  
A. Mizuoka ◽  
I. Hirasawa
Keyword(s):  
Ammonium Phosphate ◽  
Recovery Process ◽  
Phosphorus Recovery ◽  
Test Material ◽  
Phosphorus Concentration ◽  
Digested Sludge ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium ◽  
Final Effluent

Removal and recovery of phosphorus from sewage in form of MAP (magnesium ammonium phosphate) have attracted attention from the viewpoint of eutrophication prevention and phosphorus resource recovery as well as scaling prevention inside digestion tanks. In this work, phosphorus recovery demonstration tests were conducted in a 50 m3/d facility having a complete mixing type reactor and a liquid cyclone. Digested sludge, having 690 mg/L T-P and 268 mg/L PO4-P, was used as test material. The T-P and PO4-P of treated sludge were 464 mg/L and 20 mg/L achieving a T-P recovery efficiency of 33% and a PO4-P crystallization ratio of 93%. The reacted phosphorus did not become fine crystals and the recovered MAP particles were found to be valuable as a fertilizer. A case study in applying this phosphorus recovery process for treatment of sludge from an anaerobic-aerobic process of a 21,000 m3/d sewage system, showed that 30% of phosphorus concentration can be reduced in the final effluent, recovering 315 kg/d as MAP.

Phosphorus recovery using a crystallization process for Sewage Treatment Plant

2011 ◽  
Vol 6 (4) ◽  
Author(s):  
Kazuaki Shimamura ◽  
Tateki Kurosawa
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Ammonium Phosphate ◽  
Recovery Process ◽  
Phosphorus Recovery ◽  
Phosphorus Concentration ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium ◽  
Verification Test

A novel phosphorus recovery process enabling an effective reuse of recovered phosphorus as a resource has been developed. Three processes, which match the characteristics (sewage component, concentration and flow rate, etc.) of the waste water or the sludge generated form sewage treatment, are introduced here. Verification tests carried out using a crystallization of magnesium ammonium phosphate revealed a phosphorus crystallization exceeding 85%. Moreover, these tests show that the recovered phosphorus can be reused as a fertilizer. Another verification test carried out using a crystallization of hydroxylapatite revealed that the phosphorus concentration is reduced to a few milligrams per liter. In addition it is found that the recovered hydroxylapatite can be reused as a phosphorus ore. Each of the three processes is revealed to contribute to prevention of water contamination, as well as the recovery of phosphorus as a resource.

The Crystallization of Struvite by Recycling Poly-Phosphate Released from Sewage Sludge after Thermal Treatment

2013 ◽  
Vol 781-784 ◽  
pp. 1963-1967
Author(s):  
Ming Yang Zhang ◽  
Ai Min Hao ◽  
Takahiro Kuba
Keyword(s):  
Sewage Sludge ◽  
Thermal Treatment ◽  
Ammonium Phosphate ◽  
Neutral Condition ◽  
Phosphorus Recovery ◽  
Water Bodies ◽  
Phosphorus Compounds ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium ◽  
First Time

Because of the shortage crisis of phosphorus element and environmental problems caused by excess discharge of phosphorus compounds into nature water bodies, phosphorus recovery had been research hotspot. Poly-phosphate (poly-P) released from sewage sludge after thermal treatment could be recovered successfully as magnesium ammonium phosphate hexahydrate (MgNH4PO4·6H2O) commonly known as struvite in present study. This phenomenon was the first time to be found in phosphorus recovery from sewage sludge. The parameters affected struvite formation with poly-P had been tested. Poly-P indicated better characteristics in phosphorus recovery compared with ortho-phosphate (Pi) because it can be precipitated at lower pH condition even neutral condition, with less addition of magnesium element.

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