Effect of chloride concentration on nitrogen removal from landfill leachate in sequencing batch reactor after MAP pretreatment

2010 ◽  
Vol 62 (7) ◽  
pp. 1574-1579 ◽  
Author(s):  
M. Chen ◽  
S. He ◽  
Q. Yi ◽  
M. Yang
Keyword(s):  
Nitrogen Removal ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Chloride Concentration ◽  
Ammonium Phosphate ◽  
High Strength ◽  
High Energy ◽  
High Concentration ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium

Leachate generated from landfill is becoming a great environmental challenge to China as it contains high concentration of COD, ammonium and some other substances. Nitrogen removal through the conventional nitrification-denitrification process is hampered by the low C/N ratio especially for the old age landfill sites and the high energy consumption for aeration. In this study, the combination of magnesium ammonium phosphate (MAP) precipitation and Sequencing batch reactor (SBR) was suggested as a new process for the treatment of high strength ammonium, and the effect of high concentration of Cl− after MAP precipitation because of the use of MgCl2 was investigated on SBR performance. The practical upper limit of Cl− for nitrification was found to be 12,000 mg/L, above which resulted in significant accumulation of ammonium in SBR system. It is suggested that an ammonium removal of 70% was suitable for the MAP treatment to achieve a balance between increasing the C/N ratio and avoiding detrimental effect from high concentration of Cl− in the succeeding SBR system. DGGE analysis indicated that high diversity of Ammonium oxidizing bacteria (AOB) could be maintained at a Cl− concentration of 12,000 mg/L.

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 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.

scholarly journals Pembentukan Pupuk Struvite dari Limbah Cair Industri Tempe dengan Proses Aerasi

2021 ◽  
Vol 22 (2) ◽  
pp. 215-221
Author(s):  
Luluk Edahwati ◽  
Sutiyono ◽  
Rizqi Rendri Anggriawan
Keyword(s):  
Industrial Effluent ◽  
Ammonium Phosphate ◽  
Ammonium Hydroxide ◽  
Airflow Rate ◽  
White Crystal ◽  
High Concentration ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium ◽  
Aeration Process ◽  
Further Development

ABSTRACT Struvite, also known as magnesium ammonium phosphate hexahydrate, is a white crystal with a chemical formula magnesium ammonium phosphate hexahydrate (MgNH4PO4.6H2O). Because of its phosphate content, struvite can be utilized as a fertilizer. Tempeh industrial effluent contains a high concentration of PO4, making it a possible struvite fertilizer producing material. The formation of struvite fertilizer is carried out by the aeration process. This process is able to increase the pH and homogeneity of the solution. The solution of Magnesium Ammonium Phosphate (MAP) is prepared by reacting tempeh industrial wasterwater, Magnesium Chloride (MgCl2), and Ammonium Hydroxide (NH4OH). The MAP ratios used are 1:1:1 and 3:1:1. The temperature was set at 30 °C and pH 9, the airflow rate was carried out at a rate of 0.25 - 1.25 liters per minute. Struvite crystals were analyzed using X-ray Fluorescence (XRF) and Scanning Electron Microscope (SEM). The best struvite fertilizer content is magnesium by 40.3% and phosphorus by 43.9% at an air flow rate of 1.25 liters per minute and a ratio of 3:1:1. Further development can be done by applying struvite fertilizers to plants.  Keywords: aeration, crystallization, tempeh industrial wastewater, struvite   ABSTRAK Struvite adalah kristal putih yang secara kimiawi dikenal sebagai magnesium amonium fosfat heksahidrat (MgNH4PO4.6H2O). Struvite dapat dimanfaatkan menjadi pupuk karena kandungan fosfat (PO4) di dalamnya. Limbah cair industri tempe memiliki kandungan PO4 yang cukup tinggi, menjadikan limbah cair industri tempe adalah bahan pembentuk pupuk struvite yang potensial. Pembentukan pupuk struvite dilakukan dengan proses aerasi. Proses ini mampu meningkatkan pH dan homogenitas dari larutan. Larutan MAP (Magnesium Amonium Fosfat) dibuat dengan cara mereaksikan limbah cair industri tempe, Magnesium Klorida (MgCl2), dan Amonium Hidroksida (NH4OH). Rasio MAP yang digunakan adalah 1:1:1 dan 3:1:1. Temperatur ditetapkan sebesar 30°C dan pH 9, laju alir udara dilakukan dengan laju 0,25 - 1,25 liter per menit. Kristal struvite dianalisis menggunakan Floresensi sinar-X (XRF) dan Mikroskop Pemindai Elektron (SEM). Kandungan pupuk struvite terbaik adalah magnesium sebesar 40,3% dan fosfor sebesar 43,9% pada konsentrasi 3:1:1 dan laju alir udara 1,25 liter per menit. Pengembangan lebih lanjut dapat dilakukan dengan mengaplikasikan pupuk struvite ke tanaman. Kata Kunci: aerasi, kristalisasi, limbah cair industri tempe, struvite

Nitrogen removal of high strength wastewater via nitritation/denitritation using a sequencing batch reactor

2004 ◽  
Vol 50 (10) ◽  
pp. 27-33 ◽  
Author(s):  
E. Lai ◽  
S. Senkpiel ◽  
D. Solley ◽  
J. Keller
Keyword(s):  
Nitrogen Removal ◽  
Sequencing Batch Reactor ◽  
Removal Rate ◽  
Batch Reactor ◽  
High Strength ◽  
Ph Control ◽  
Pilot Scale ◽  
Ammonium Nitrogen ◽  
Experimental Results ◽  
Short Period

The sequencing batch reactor (SBR) process concept was applied to achieve efficient ammonium removal via nitrite under both laboratory and pilot-scale conditions. Both sets of experimental results show that without pH control or carbon addition the nitritation process consistently converted approximately 50% of the ammonium from biosolids dewatering liquids to nitrite with hydraulic retention times (HRT) as short as 10 h. The results from the pilot-scale study also indicate that the selective oxidation of ammonium to nitrite is a reliable process as the accumulation of nitrate was never an issue during a 330-day trial. The SBR process concept was extended to achieve complete nitrogen removal through nitritation and denitritation in the laboratory scale. The experimental results indicate that a total reduction of 96-98% of the ammonium nitrogen from biosolids dewatering liquids (influent concentration typically 1,200 g m-3 ) was achieved with a short HRT of 1.1 d and a removal rate of 1.05 kgNm-3d-1. This process concept was tested at pilot scale where the nitritation process could be started up without temperature control in a short period of time. Nitrogen removal rates up to 1.2 kgNm-3d-1 at an HRT of 0.88 d have been obtained. COD to nitrogen ratios required in the pilot plant were consistently in the range 1.6-1.9 kgCOD kg-1N removed.

scholarly journals Microbial composition and nitrogen removal pathways in a novel sequencing batch reactor integrated with semi-fixed biofilm carrier: Evidence from a pilot study for low- and high-strength sewage treatment

2021 ◽  
Author(s):  
Bin Cui
Keyword(s):  
Nitrogen Removal ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Sewage Treatment ◽  
High Strength ◽  
Ammonium Oxidation ◽  
Microbial Composition ◽  
Biofilm Carrier ◽  
N Assimilation ◽  
Fixed Biofilm

Abstract The sequencing batch reactor (SBR) activated sludge process is a well-established technology for sewage treatment. One of the drawbacks of SBRs, however, is the failure to conform to the standard for total nitrogen (TN) discharge. By means of introducing four improvements, including semi-fixed biofilm carrier, sludge elevation mixing and change for the mode of influent and effluent, compliant standard for TN discharge was obtained in this novel SBR configuration during low- and high- -strength sewage load. To illustrate the microbial compositions and functions of the attached biofilm on semi-fixed carrier and the suspended aggregates, as well as the nitrogen removal pathway, high throughput 16S rRNA gene amplicon sequencing, PICRUSt2 algorithm and KEGG database were applied. The results revealed that: i) the microbial communities from suspended aggregates and biofilm samples were significantly different from each other; ii) during low-strength sewage loads, TN removal was mainly by nitrification-denitrification. The suspended aggregates was responsible for denitrification, while the biofilm was focused on ammonium oxidation; iii) during high-strength sewage loads, function of nitrate reductase from suspended aggregates was faded, and anammox and N assimilation by biofilm became dominant. Meanwhile, TN removal referring to the formation of L-glutamine via assimilation was the main pathway.

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