Controlled struvite crystallisation for removing phosphorus from anaerobic digester sidestreams

Münch, E. von; Barr, K.

doi:10.1016/s0043-1354(00)00236-0

Cited by 413 publications

(227 citation statements)

References 4 publications

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“…(5) demonstrated that the percent of ammonia removal increases, with the increase of pH, and the optimum pH value was 9.0. Various authors have reported optimum pH values for struvite precipitation was the range of between 8.5 to 9.0 for different type of wastewaters such as anaerobic digester effluent, swine wastewater, sludge, and livestock waste [11][12][13][14][15] .…”

Section: Use Of Sbbr System To Remove Ammonia (Nh 3 -N) As a Biologicmentioning

confidence: 99%

Comparison between Biological Treatment and Chemical Precipitation for Nitrogen Removal from Old Landfill Leachate

Teng-rui¹,

Al-Harbawi²,

He³

et al. 2007

American J. of Environmental Sciences

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Abstract:The study reports the results of a laboratory scale investigation aimed at evaluating the effectiveness of mature municipal landfill leachate treatment by a biological stage (used SBBR as a biological treatment) and Chemical precipitation (Used MAP precipitation (magnesium ammonium phosphate)) to study the nitrogen removal capabilities for treatment of sanitary landfill leachate containing high ammonia concentration, and the comparison between them. The monitored sample taken from the Chang Sheng bridge landfill site in Chongqing city-China, has its concentrations of COD, BOD 5 , and NH 3 -N about 1650, 75 and 1100 mg/l respectively. The results from SBBR showed that after two months long period of domestication and one month period of stability, the ammonia nitrogen removal efficiency reached to 99% in the SBBR reactor, at nitrogen loading rate 0.51 kg TN/m 3 per day and HRT was 9 hours, met to Chinese standards for discharge. The results of the MAP precipitation was technically effective to remove the high NH 3 -N strength of over 1100 mg/l from the raw leachate at molar ratio of Mg 2+ : NH 4 + : PO 4 -3 of 1:1:1, they demonstrated a very satisfactory removal of ammonia; an initial NH 3 + -N concentration of 1100 mg/l contained in the raw leachate was quickly reduced to 28 mg/l within 15 min, while the pH producing a maximum removal of ammonia was 9.0. The percent removal of ammonia after treatment by MAP was 97.5%.

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Section: Use Of Sbbr System To Remove Ammonia (Nh 3 -N) As a Biologicmentioning

confidence: 99%

Comparison between Biological Treatment and Chemical Precipitation for Nitrogen Removal from Old Landfill Leachate

Teng-rui¹,

Al-Harbawi²,

He³

et al. 2007

American J. of Environmental Sciences

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“…MAP is the crystallized form of MgNH4PO4·6H2O and is used as a slow-release fertilizer [Munch and Barr, 2001]. The MAP crystallization reaction has a beneficial effect on the conservation of nitrogen and phosphorus in compost, making MAP an appropriate fertilizer for container plants, turfs, tree seedlings, ornamentals, vegetables, and flower boards [Bridger et al, 1962].…”

Section: Introductionmentioning

confidence: 99%

Influence of Compost Recycling and Magnesium Supplement on Physical and Chemical Traits of Animal Manure Compost

Lee¹,

Kwag²,

Ra³

2010

Journal of Animal Science and Technology

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A series of experiments were performed to study the influence of the following parameters on the physical traits and composition of swine manure compost: (1) addition of magnesium (Mg) at a molar ratio of 1.2 with respect to PO4, and (2) reutilization of compost containing MgNH4PO4·6H2O (magnesium ammonium phosphate, MAP). Three independent batch tests were conducted for replication: batch test I-control (C) and Mg added (T), batch test II-C, T and compost recycle (TR1), and batch test III-C, T and compost recycle (TR2). Magnesium addition and compost reutilization had no adverse effect on the degradation of organic matter. Reuse of the compost, however, had a clear effect on the total nitrogen (TN) and total phosphorus (TP) contents in the final compost. Repeated compost reutilization as a bulking material was resulted in composts rich in N and P. Upon adding the Mg supplement to the composting materials, the ortho-phosphate (OP) to TP ratio decreased due to the MAP crystallization reaction. The decrease in the OP/TP ratio and the increase in the TP content of the compost indicate that water-soluble phosphate is converted into a slow-release phosphate by the formation of crystals during composting. X-ray diffraction analysis of the irregular shaped crystals in the compost indicated that they are MAP crystals and that the crystallization of MAP begins immediately after the addition of the Mg supplement. The Mg addition to composting materials and the reutilization of compost as a bulking material would be a practical means to conserve nutrient content.

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“…Although chemical precipitation requires a lot of cost involvement due to chemical reagents, MAP or struvite recovery from wastewater would be an effective process for the simultaneous removal of nitrogen and phosphorus from wastewater, as well as for the recovery of resources that can be used as a highly valuable slowly releasing fertilizer (Munch and Barr, 2001). Struvite is a crystal of MAP formed in alkaline condition, and its chemical formula is MgNH4PO46H2O and addition of Mg source in the wastewater enhances the struvite formation.…”

Section: ⅰ Introductionmentioning

confidence: 99%

Microwave Irradiation as a Way to Reutilize the Recovered Struvite Slurry and to Enhance System Performance

Cho

Lee²,

Ra³

2009

Journal of Animal Science and Technology

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Controlled struvite crystallisation for removing phosphorus from anaerobic digester sidestreams

Cited by 413 publications

References 4 publications

Comparison between Biological Treatment and Chemical Precipitation for Nitrogen Removal from Old Landfill Leachate

Comparison between Biological Treatment and Chemical Precipitation for Nitrogen Removal from Old Landfill Leachate

Influence of Compost Recycling and Magnesium Supplement on Physical and Chemical Traits of Animal Manure Compost

Microwave Irradiation as a Way to Reutilize the Recovered Struvite Slurry and to Enhance System Performance

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