Phosphate removal in anaerobic liquors by struvite crystallization without addition of chemicals: Preliminary results

Battistoni, P.; Fava, Gabriele; Pavan, Paolo; Musacco, A.; Cecchi, Fabiola

doi:10.1016/s0043-1354(97)00137-1

Cited by 151 publications

(60 citation statements)

References 7 publications

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“…Struvite is a white crystalline substance consisting of magnesium, ammonium and phosphorus in equal molar concentration. In addition, struvite is a valuable slow-release fertilizer, the production of which could offset much of the cost of chemical treatment [9] [10][11][12]. The precipitation of struvite is affected by several factors, namely the pH, the chemical composition of the wastewater (degree of saturation with respect to magnesium, ammonium and phosphate; presence of other ions, such as, calcium, ionic strength of the solution), and the temperature of the solution [13,14].…”

Section: Introductionmentioning

confidence: 99%

Chemical Precipitation of Ammonia and Phosphate from Nam Son Landfill Leachate, Hanoi

Khai¹

2012

IJEE

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Abstract:Leachate from municipal landfills of the city is often contaminated heavily, especially for parameters such as organic components, heavy metals, microorganisms. However, leachate also contains amounts of valuable nutrients (e.g. N, P, K) which can be used for agriculture as fertilizers. Precipitated of N and P in the form of struvite (MgNH 4 PO 4 .6H 2 O) might be applied as a technique for removal a huge amount of N as well as P in wastewater. This study investigated the recovery ability of N, P in leachate from Nam Son municipal landfill of Hanoi city. Different pH values, anaerobic time and stoichiometric Mg 2+ : NH 4 + : PO 4 3-was tested to determine the optimal conditions for precipitating struvite. The effect of pH on the forming of struvite was between pH 9 to 11. The results showed that nutrients in landfill leachate could be recovered with the optimum pH around 9.5 and the optimum Mg 2+ : NH 4 + : PO 4 3-molar ratio as 1.15: 1: 1. With the anaerobic interval of 21 days, COD value in landfill leachate was decreased to 60%, the retrieval reached 80.6% for nitrogen and 82.7% for phosphorus. According to estimates, with the application of struvite precipitation technique, the average annual retrieval amount of NH 4 + and PO 4 3-can reach 263 tons and 25 tons, respectively.

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Section: Introductionmentioning

confidence: 99%

Chemical Precipitation of Ammonia and Phosphate from Nam Son Landfill Leachate, Hanoi

Khai¹

2012

IJEE

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“…Dittmarite was removed from the bottom of the tank as a white solid and it was air-dried and stored for use as a fertilizer supplement. Similar small studies have removed phosphorus and nitrogen from animal and municipal wastewaters [14,15].…”

Section: Pilot-scale Assessmentmentioning

confidence: 87%

Removal of Nitrogen and Phosphorus from Animal and Municipal Wastewaters as Dittmarite

Atalay¹,

Whitehead²,

Oyewole³

et al. 2017

JESE-B

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Phosphorus and nitrogen are known causes of eutrophication in rivers, lakes streams and estuaries. The sources of these nutrients are diverse and they include chemical fertilizers, CAFOs (Confined Animal Feeding Operations), land application of animal and municipal as well as industrial wastewaters. Application of manure slurries to crop land beyond allowable limits could result in high levels of phosphorus and nitrogen in runoff that negatively impact aquatic animals. Municipal wastewater treatment plants are setup to remove these nutrients from domestic and industrial wastewater through a network of treatment processes. Controlling the discharge of phosphorus and nitrogen in wastewater is a key factor in preventing eutrophication. This paper presents work done to enhance a chemical precipitation process that removes over 90% of dissolved phosphorus and nearly 20% of dissolved nitrogen from both synthetic and municipal wastewaters. The objective of the study is to remove nitrogen and phosphorus from wastewater as dittmarite, a value-added mineral fertilizer found in nature. A laboratory procedure was developed that generated significant quantities of dittmarite from various wastewaters. Pure dittmarite contains nitrogen, phosphorus and magnesium in approximate molar ratios of 1:1.2:1.2 that can support plant growth. It is produced as a wet precipitate from chemical reactions that occur in the wastewater treatment process; it can be dried for proper handling and utilization. Municipal wastewater treatment plants, high volume fish producers, CAFOs and individual rural homeowners could all benefit from this technology for on-site removal of nitrogen and phosphorus from produced wastewaters.

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“…super saturation), and in addition acting as a template for the nucleation and stereochemical arrangements of the NH 4 MgPO 4 •6H 2 O crystals. 42 The production of NH 4 MgPO 4 •6H 2 O by removal of phosphates from supernatant liquors of anaerobic sludge digestion (anaerobic mesophilic bacteria) was reported by Battistoni et al 43 This compound was also produced by using epimastigotes of Trypanosoma cruzi. 44 The Trypanosoma consumes glucose rapidly from the medium while the pH decreases from 6.3 to 5.5, since acids are generated (e.g.…”

Section: Phosphate Accumulation In Organismsmentioning

confidence: 93%

Biogenic Synthesis of Important Environmental Minerals: Magnesium Phosphate Compounds and Perspectives

Durán¹,

Fávaro²

2018

Quim. Nova

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Recebido em 18/12/2017; aceito em 22/01/2018; publicado na web em 22/02/2018The ecological processes in which metabolites with industrial or medical applications are produced are of great importance. Magnesium plays many important roles in environmental and medical applications. Phosphorus is obtained by mining. It is estimated to have a very limited half-life and expected to be depleted as a resource in 100 years. Its recovery by mining and subsequent marketing as phosphate has important environmental implications. These processes are part of an important recovery technology. Bacteria have contributed to the formation of minerals since the advent of life on Earth. Bacterial and/or fungal biomineralizations play a critical role in biogeochemical cycles. These processes have important technological and environmental applications. In many past publications dealing with bacterial and fungal recovery of phosphates as insoluble products, magnesium played an important role. This is a review of recent progress in the microbial recovery of biogenic magnesium phosphate compounds, their importance, and their roles in treatment of several human diseases.

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Phosphate removal in anaerobic liquors by struvite crystallization without addition of chemicals: Preliminary results

Cited by 151 publications

References 7 publications

Chemical Precipitation of Ammonia and Phosphate from Nam Son Landfill Leachate, Hanoi

Chemical Precipitation of Ammonia and Phosphate from Nam Son Landfill Leachate, Hanoi

Removal of Nitrogen and Phosphorus from Animal and Municipal Wastewaters as Dittmarite

Biogenic Synthesis of Important Environmental Minerals: Magnesium Phosphate Compounds and Perspectives

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