Assessment of source-based nitrogen removal alternatives in leather tanning industry wastewater

2002 ◽  
Vol 45 (12) ◽  
pp. 205-215 ◽  
Author(s):  
G. Zengin, ◽  
T. Ölmez ◽  
S. Doğruel ◽  
I. Kabdaşlı ◽  
O. Tünay
Keyword(s):  
Ammonium Phosphate ◽  
Ammonia Removal ◽  
Treatment Alternative ◽  
Magnesium Ammonium Phosphate ◽  
Leather Tanning ◽  
Magnesium Ammonium ◽  
Definition Of ◽  
Parameter Values ◽  
Industry Wastewater ◽  
Tanning Industry

Nitrogen is an important parameter of leather tanning wastewaters. Magnesium ammonium phosphate (MAP) precipitation is a chemical treatment alternative for ammonia removal. In this study, a detailed source-based wastewater characterisation of a bovine leather tannery was made and nitrogen speciation as well as other basic pollutant parameter values was evaluated. This evaluation has led to definition of alternatives for source-based MAP treatment. MAP precipitation experiments conducted on these alternatives have yielded over 90% ammonia removal at pH 9.5 and using stoichiometric doses. Among the alternatives tested liming-deliming and bating-washing was found to be the most advantageous providing 71% ammonia removal.

Ammonia removal by magnesium ammonium phosphate precipitation in industrial wastewaters

1997 ◽  
Vol 36 (2-3) ◽  
pp. 225-228 ◽  
Author(s):  
Olcay Tünay ◽  
Isik Kabdasli ◽  
Derin Orhon ◽  
Saadettin Kolçak
Keyword(s):  
Ammonium Phosphate ◽  
Domestic Wastewater ◽  
Ammonia Concentration ◽  
Ammonia Removal ◽  
Magnesium Ammonium Phosphate ◽  
The Public ◽  
Effluent Quality ◽  
Leather Tanning ◽  
Segregated Flow ◽  
Magnesium Ammonium

In this study, the theoretical basis and limitations of magnesium ammonium phosphate (MAP) precipitation are investigated and experimentally tested for leather tanning industry. The MAP precipitation is applied to leather tanning wastewaters for both segregated flows containing high ammonia concentrations and combined flows. Segregated flow treatment on smaller volumes of wastewater provided an ammonia concentration of down to 150 mg l−1 NH3-N. The resulting ammonia concentration of MAP precipitation on combined wastewater is at the level of domestic wastewater which eliminates the need of further nitrogen removal in the biological treatment and provides an effluent quality acceptable for the public sewer.

Assessment of magnesium ammonium phosphate precipitation for the treatment of leather tanning industry wastewaters

2002 ◽  
Vol 46 (4-5) ◽  
pp. 231-239 ◽  
Author(s):  
I. Kabdaşli ◽  
O. Tünay ◽  
M.Ş. Çetin ◽  
T. Ölmez
Keyword(s):  
Biological Treatment ◽  
Ammonium Phosphate ◽  
Chemical Precipitation ◽  
Optimum Conditions ◽  
Magnesium Ammonium Phosphate ◽  
Ammonium Removal ◽  
Leather Tanning ◽  
Magnesium Ammonium ◽  
Recent Method ◽  
Study Application

Magnesium ammonium phosphate (MAP) precipitation has a potential for ammonium removal from industrial wastewaters. Application basis of this recent method of treatment has not been fully determined. In this study application of MAP precipitation to leather tanning wastewaters has been experimentally evaluated. Five alternative places of MAP precipitation in leather tanning wastewater treatment scheme tested were; instead of plain settling, after plain settling, after polyelectrolyte added plain settling, within the chemical precipitation and after biological treatment. Among these alternatives MAP application instead of plain settling and within the chemical precipitation were found to be most favourable and efficient by reducing the nitrogen load to the level of nutrient requirement in the biological stage. pH 9.0-9.5 and stoichiometric magnesium and phosphate doses were determined to be optimum conditions for MAP precipitation.

Nitrogen removal from tannery wastewater by protein recovery

2003 ◽  
Vol 48 (1) ◽  
pp. 215-223 ◽  
Author(s):  
I. Kabdaşli ◽  
T. Ölmez ◽  
O. Tünay
Keyword(s):  
Nitrogen Removal ◽  
Protein Profile ◽  
Effective Means ◽  
Ammonium Phosphate ◽  
Ammonia Removal ◽  
Protein Precipitation ◽  
Magnesium Ammonium Phosphate ◽  
Recovery Potential ◽  
Magnesium Ammonium ◽  
Isoelectric Ph

Nitrogen removal from wastewaters has gained importance in recent years. In this paper protein precipitation and recovery potential of leather tanning industry wastewaters were experimentally evaluated. A protein profile for all sources was prepared. Liming was determined to be the most important protein source. Composite samples were made up to assess the protein precipitation applications. Isoelectric pH precipitation yielded around 50% protein removal between the optimum pH interval of 2.1-3.8. FeCl3 proved to be a very effective means of protein removal providing over 60% efficiency. Polyelectrolyte precipitation did not yield satisfactory results. Magnesium ammonium phosphate precipitation followed by acid precipitation of protein provided 85% ammonia removal in addition to 50% protein removal.

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.

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.

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.

Struvite precipitation potential for nutrient recovery from anaerobically treated wastes

2001 ◽  
Vol 43 (11) ◽  
pp. 259-266 ◽  
Author(s):  
A. Miles ◽  
T. G. Ellis
Keyword(s):  
Batch Reactor ◽  
Ammonium Phosphate ◽  
Ammonia Concentration ◽  
Pilot Scale ◽  
Ammonia Removal ◽  
Molar Ratio ◽  
Magnesium Ammonium Phosphate ◽  
Wide Range ◽  
Magnesium Ammonium ◽  
Struvite Precipitation

Geochemical equilibrium speciation modeling was used to determine optimum conditions for precipitation of magnesium ammonium phosphate, or struvite, for the recovery of nutrients from anaerobically digested wastes. Despite a wide range of pH values with the potential to precipitate struvite, the optimum pH was determined to be 9.0. Bench experiments conducted on effluent from an anaerobic sequencing batch reactor (ASBR) treating swine wastes achieved a maximum of 88% ammonia removal at a pH of 9.5 with added magnesium and phosphate to achieve an ammonium: magnesium: phosphate molar ratio of 1:1.25:1. Struvite precipitation was performed on a continuous basis in a pilot-scale ASBR treating swine wastes. Through the addition of supplemental magnesium and phosphate, the ammonia concentration was reduced from 1500 mg/L as nitrogen to less than 10 mg/L. The supematant from the struvite precipitation clarifier was recycled to the feed of the ASBR without adverse impact, simulating on-farm effluent reuse as flush water.

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