Pretreatment of ammonium removal from landfill leachate by chemical precipitation

Zhang, Tao; Ding, Lili; Ren, Hongqiang

doi:10.1016/j.jhazmat.2008.11.101

Cited by 155 publications

(77 citation statements)

References 21 publications

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“…This may be attributed to the fact that the solution is significantly saturated in terms of struvite-forming ions; the effect of an increase in the pH value becomes insignificant during the removal of ions from the solution (UludagDemirer & Othman 2009). According to the results reported in other literatures, it was concluded that, by using the soluble form of brucite, a ammonium removal equivalent to that obtained with pure magnesium salts, such as MgCl 2 ?6H 2 O and MgSO 4 ?7H 2 O Zhang et al 2009), could be achieved.…”

Section: Resultsmentioning

confidence: 99%

Removal of ammonium from rare-earth wastewater using natural brucite as a magnesium source of struvite precipitation

Huang

Xiao

Yang

et al. 2011

Water Science and Technology

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This paper presents a study regarding ammonium removal from rare-earth wastewater by struvite precipitation with natural brucite mineral as a source of magnesium. Experimental results indicated that a pH ranging from 8.5 to 9.5 was the optimum for the removal of ammonium using the soluble form of brucite as a magnesium source. Additionally, when solid brucite was used as a magnesium source as well as an alkali reagent, the initial ammonium concentration of 4,535 mg/L decreased to 239-317 mg/L after an reaction time of 12 h in wastewater treated with the S/L (solid brucite/liquid wastewater) ratios ranging from 31.2 to 63.2 g/L. Furthermore, as some non-reacted brucite still remained in the precipitates obtained at the end of reaction, the precipitates were subjected to reuse. The reuse results demonstrated that the reuse of the precipitates obtained with 63.2 g/L was feasible, and almost half of the brucite dose could be saved.Key words 9 9 9 9 ammonium, brucite mineral, phosphorus, rare-earth, struvite precipitation

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Section: Resultsmentioning

confidence: 99%

Removal of ammonium from rare-earth wastewater using natural brucite as a magnesium source of struvite precipitation

Huang

Xiao

Yang

et al. 2011

Water Science and Technology

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“…The optimum pH = 9.5 was fixed to investigate the next factors. 4 3-will generate higher concentration of PO 4 3-in the effluent [2]. As a result, the removal efficiency Mg 2+ : NH 4 + : PO 4 3-molar ratio in case control at 1.15:1:1 in order to remove nutrients effectively from landfill leachate as well as to avoid higher concentration of phosphate in the effluent.…”

Section: Fig 1: Nutrients Removal Ratio At Different Phmentioning

confidence: 99%

“…Leachate is characterized by a high content of organic matters (expressed as COD, BOD 5 and TOC), a high concentration of nutrients (N, P) and microorganisms. Treatment of leachate is very complicated and generally requires various process applications due to high contents of ammonium and high COD/BOD ratio [2]. Anaerobic biological treatment systems are efficient to treat high concentrations of COD, but high concentrations of ammonium inhibit biological treatment systems.…”

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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“…The process was carried out at constant temperature of 20°C and pH value at the level of 9.0-9.2. The applied pH value was included within the optimum range for struvite precipitation [26,33,41,45]. The retention time of post-digestion liquor amounted to 24 hours.…”

Section: Ammonium Magnesium Phosphate (Struvite) Precipitation Testsmentioning

confidence: 99%

Post-Digestion Liquor Treatment in the Method Combining Chemical Precipitation with Reverse Osmosis

Kuglarz¹,

Grűbel²,

Bohdziewicz³

2014

Archives of Environmental Protection

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Abstract:The aim of the study was to develop an effective treatment of post-digestion liquors highly-loaded with biogenic and organic substances. The scope of the research project encompassed: mesophilic anaerobic digestion of waste activated sludge (WAS) as well as the treatment of post-digestion liquors, coming from the most appropriate HRT value of 25 days, in the process of ammonium magnesium phosphate (struvite) precipitation targeted at ammonia nitrogen binding and a subsequent reverse osmosis (RO) process. It was established that the method combining chemical precipitation and high-pressure fi ltration ensures a high degree of contaminants removal allowing for a direct release of treated liquors into the natural reservoir. However, in order to decrease the residual NH 4 + concentration (6

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Pretreatment of ammonium removal from landfill leachate by chemical precipitation

Cited by 155 publications

References 21 publications

Removal of ammonium from rare-earth wastewater using natural brucite as a magnesium source of struvite precipitation

Removal of ammonium from rare-earth wastewater using natural brucite as a magnesium source of struvite precipitation

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

Post-Digestion Liquor Treatment in the Method Combining Chemical Precipitation with Reverse Osmosis

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