scholarly journals Magnesium ammonium phosphate precipitation method in the treatment of ammonia nitrogen in the landfill leachate analysis of influence factors

2016 ◽  
Author(s):  
Runlei Cai ◽  
Xiang He ◽  
JinXiang Fu ◽  
Fan Wang
Keyword(s):  
Landfill Leachate ◽  
Influence Factors ◽  
Ammonium Phosphate ◽  
Ammonia Nitrogen ◽  
Precipitation Method ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium ◽  
Leachate Analysis

Study on the Treatment of Ammona-Nitrogen Wastewater by Magnesium Ammonium Phosphate

2011 ◽  
Vol 233-235 ◽  
pp. 528-531
Author(s):  
Li Na He ◽  
Hua Ye ◽  
Can Cao ◽  
Ying Fen Li
Keyword(s):  
Removal Rate ◽  
Nitrogen Concentration ◽  
Ammonium Phosphate ◽  
Ammonia Nitrogen ◽  
Ammonium Nitrogen ◽  
Precipitation Method ◽  
Magnesium Ammonium Phosphate ◽  
Effective Technology ◽  
Magnesium Ammonium ◽  
Natural Water Bodies

Large quantities of ammonia-nitrogen (-N) in wastewater is one of the main causes of eutrophication that endanger both natural water bodies and fresh water seriously. Thus, it is necessary to find an economic and feasible method to remove the ammonium-nitrogen in wastewater before they are returned to the environment. Magnesium ammonium phosphate precipitation method is one of the effective technology of wastewater treatment. In this paper, the influence of initial ammonia-nitrogen concentration, pH, temperature and mole ratio of :NH+4 :Mg2+were studied, What is more, the optimum condition of this process was determined. The results indicated that ammonia-nitrogen concentration is decreased from 1434 mg/L to 95.65 mg/L, and the removal rate reached 93.33% at the optimum conditions, which laying a foundation for the following biochemical treatment.

Ammonia Nitrogen Removal from Chlor-Alkali Chemical Industry Wastewater by Magnesium Ammonium Phosphate Precipitation Method

2012 ◽  
Vol 573-574 ◽  
pp. 1096-1100 ◽  
Author(s):  
Lei Zhu ◽  
Zhi Yong Guo ◽  
Xiu Yi Hua ◽  
De Ming Dong ◽  
Da Peng Liang ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Chemical Industry ◽  
Ammonium Phosphate ◽  
Ammonia Nitrogen ◽  
Precipitation Method ◽  
Reagent Ratio ◽  
Magnesium Ammonium Phosphate ◽  
Removal Ratio ◽  
Magnesium Ammonium ◽  
Industry Wastewater

This study introduces a method of ammonia nitrogen removal from chlor-alkali industry wastewater by magnesium ammonium phosphate (MAP) precipitation. The effect of pH, reagent ratio and temperature were investigated. The pH was found to be the most significant factor. The optimal ammonia nitrogen removal ratio is about 46% under the condition of pH=10, reagent ratio n(Mg) : n(N) : n(P)=1.2 : 1.0 : 1.0 and temperature=35°C. According to this study, MAP precipitation method has the potential ability to be applied to remove ammonia nitrogen from chlor-alkali chemical industry wastewater.

The Removal of High NH3-N Concentration in Wastewater by Chemical Precipitation

2011 ◽  
Vol 233-235 ◽  
pp. 733-736
Author(s):  
Wei Hua Song ◽  
Jun Yin ◽  
Jian Hui Wang
Keyword(s):  
Ph Value ◽  
Removal Rate ◽  
Ammonium Phosphate ◽  
Chemical Precipitation ◽  
Ammonia Nitrogen ◽  
Precipitation Method ◽  
Magnesium Ammonium Phosphate ◽  
Ph Values ◽  
N Concentration ◽  
Magnesium Ammonium

A lab-scale study was conducted to precipitate the ammonia from high NH3-N concentration wastewater in the form of magnesium ammonium phosphate(MAP) by applying such chemicals such as MgCl2·6H2O and KH2PO4.The influences of pH value, reactive time and removal rate of ammonia nitrogen were tested.The results shows that the feasible pH values of crystallization and precipitation were between 8 and 10. The structure of struvite crystallization was destroyed under high pH value condition that resulted in ammonia nitrogen dissociating from MAP, which reduced the removal rate of ammonia nitrogen. Results also demonstrated that ammonia nitrogen was effectively reduced from initia1981mg/L to final 5 mg/L, which removal efficiency reached 99% with crystallization and precipitation method when the optimal pH, precipitation time mole ratio of Mg2+, NH4+, PO43- were 8.0, 20 min and 1.4∶1∶1.4 respectively.

Ammonia removal from young landfill leachate by magnesium ammonium phosphate precipitation and air stripping

2000 ◽  
Vol 41 (1) ◽  
pp. 237-240 ◽  
Author(s):  
I. Kabdaslı ◽  
O. Tünay ◽  
İ. Öztürk ◽  
S. Yılmaz ◽  
O. Arıkan
Keyword(s):  
Organic Matter ◽  
Landfill Leachate ◽  
Ammonium Phosphate ◽  
Ammonia Removal ◽  
Aerobic Treatment ◽  
Air Stripping ◽  
Magnesium Ammonium Phosphate ◽  
Physical Chemical ◽  
Sanitary Landfills ◽  
Magnesium Ammonium

Leachate from sanitary landfills is a strong wastewater in terms of organic matter and ammonia. Organic matter can be reduced by anaerobic plus aerobic treatment; however, ammonia reduction by nitrification often poses problems due to inhibition. In this study, ammonia removal by physical chemical treatment from young leachate and anaerobically treated young landfill leachate was experimentally investigated. Magnesium ammonium phosphate precipitation (MAP) and ammonia stripping at pH 12 provided ammonia removals over 90 and 85% respectively. Up to 80% COD removal was obtained with MAP precipitation of raw leachate.

Pretreatment of High Strength Ammonia Removal from Rare-Earth Wastewater by Magnesium Ammonium Phosphate (MAP) Precipitation

2012 ◽  
Vol 496 ◽  
pp. 42-45 ◽  
Author(s):  
Hao Wang ◽  
Guan Wen Cheng ◽  
Xiao Wei Song ◽  
Zai Han Xu ◽  
Jin Jie Meng ◽  
...  
Keyword(s):  
Rare Earth ◽  
Reaction Time ◽  
Removal Rate ◽  
Ammonium Phosphate ◽  
High Strength ◽  
Ammonia Nitrogen ◽  
Ammonia Removal ◽  
Molar Ratio ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium

Ammonia is one of the most important contaminants affecting the quality of water environment. Magnesium ammonium phosphate (MgNH4PO4·6H2O), which is a slow releasing fertilizer, is one possible way to remove high strength ammonia from the wastewater. The wastewater is collected from the effluent of extraction of rare earth elements factory, the study investigate the influence of pH, magnesium and phosphate dosing molar ratio and reaction time for ammonia removal rate. The results show that: when the pH = 9.2, n (Mg): n (N): n (P) = 2.2:1:2, reaction time t = 20min, ammonia concentration of the wastewater from 4420mg / L down to 1440mg / L , ammonia nitrogen removal rate can reach 67%, the remaining TP = 0.9mg / L; higher Ca2 + concentration will affect the MAP precipitation for removing ammonia, but it help to reduce total phosphorus concentrations of effluent; it is not the longer reaction time the better removal rate, because the MAP-formation will destroy with longer reaction time.

scholarly journals Recycling of Phosphorus and Ammonia Nitrogen from Digestate

2018 ◽  
Vol 64 (4) ◽  
pp. 36-39
Author(s):  
Katrin Calábková ◽  
Petra Malíková ◽  
Silvie Heviánková ◽  
Michaela Červenková
Keyword(s):  
Sewage Treatment ◽  
Ammonium Phosphate ◽  
Ammonia Nitrogen ◽  
Stoichiometric Ratio ◽  
Nitrogen And Phosphorus ◽  
Magnesium Ammonium Phosphate ◽  
Quality Of Water ◽  
Magnesium Ammonium ◽  
Stirring Time ◽  
High Concentrations

Abstract Digestate from biogas plants, formed by dewatering anaerobically stabilized sludge, is characteristic of high concentrations of phosphates and ammonia nitrogen suitable for further use. Phosphorus is an element widely used to produce fertilizers, and because of its continually shortening natural supplies, recycling of phosphorus is gaining on significance. Both phosphorus and nitrogen are important elements and their presence affect the quality of water resources. Both elements can contribute to eutrophication. At the same time, both phosphorus and ammonia nitrogen, are important elements for agricultural production, and therefore greater demands are being made on the effort to connect sewage treatment processes and the process of recycling of these nutrients. A suitable product of phosphorus and ammonia nitrogen are phosphates in the form of a structurally-poorly soluble precipitate of magnesium ammonium phosphate (struvite). This form of slowly decomposing fertilizer is distinguished by its fertilizing abilities. Compared to direct use of digestate as a fertilizer, struvite is more stable and can gradually release ammonia nitrogen for a long time without unnecessary losses. In the reported experiments, the precipitation efficiency of the recycling of ammonia nitrogen and phosphorus from the digestate liqour (liquid discharge from digestate) was, at a stoichiometric ratio of Mg2+: NH4+: PO43− (3.2: 1: 0.8) and a stirring time of 15 minutes, 87 % for ammonia nitrogen ions.

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