Treatment process adapted to stabilized leachates: Lime precipitation–prefiltration–reverse osmosis

Renou, S.; Poulain, Sébastien; Givaudan, J.G.; Moulin, P.

doi:10.1016/j.memsci.2007.11.023

Cited by 62 publications

(62 citation statements)

References 44 publications

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“…Renou et al (2008) obtained more than 95 % efficiency in the removal of both Cl -and SO 4 2-. The similar removal effect was achieved by Li et al (2009).…”

Section: Removal Of Organic and Inorganic Compoundsmentioning

confidence: 94%

Removal of organic and inorganic compounds from landfill leachate using reverse osmosis

Tałałaj

2014

Int. J. Environ. Sci. Technol.

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The main objective of this work was to evaluate an effectiveness of removing organic and inorganic pollutants from landfill leachate in a long-term reverse osmosis (RO) study. Investigations were carried out during the first year of RO exploitation since February till September 2013. Over 20 parameters were analysed both in leachate and permeate samples. In the first 1-year operation, the treatment performance was feasible for most of analysed leachate pollutants. The average removal rate of chemical oxygen demand (COD), electro-conductivity, ammonia nitrogen (N-NH 4 ? ), total inorganic nitrogen, cyanides (CN -), iron (Fe) and chlorides (Cl -) reached 97, 97.2, 98.7, 99, 93, 97.6 and 98 %, respectively. A smaller reduction rate-of 83 and 86 %-was obtained for sulphates (SO 4 2-) and sulphides (S -), what is the result of sulphuric acid addition before treatment process in order to decline a pH to a value of 6.0-6.5. Boron was eliminated only by 81 % due to easy transportation through the membrane uncharged species of boric acid B(OH) 3 , which predominate in leachate. Average reduction of nitrites (NO 2 -) and nitrates (NO 3 -) was 63.8 %, which is the result of inhibition NO 2 -oxidizers by nitrous acid and relatively low ratio of biochemical oxygen demand and COD (BOD/COD). The obtained permeate quality does not meet the Polish discharge standards for S -. It is also foreseen that the concentration of N-NH 4 ? in maturate leachate will increase in the next years.

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“…Renou et al (2008) obtained more than 95 % efficiency in the removal of both Cl -and SO 4 2-. The similar removal effect was achieved by Li et al (2009).…”

Section: Removal Of Organic and Inorganic Compoundsmentioning

confidence: 94%

Removal of organic and inorganic compounds from landfill leachate using reverse osmosis

Tałałaj

2014

Int. J. Environ. Sci. Technol.

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“…For example, hydraulic retention times (HRT) for activated sludge processes, sequencing batch reactors and digesters, vary from a few hours to several weeks for treatment of leachate with similar COD [5]. More recently, membranes, especially reverse osmosis (RO), have landfill leachate is heavily contaminated with organic matter and ammonia nitrogen from the ammonification of organic nitrogen, heavy metals and other toxic and priority pollutants.…”

Section: Introductionmentioning

confidence: 99%

“…However, no single technology claims to handle this heavily polluted residue in an efficient way or compliance with the most stringent regulations without operational constrains that limit in one way or another its practical application. Several authors have extensively reviewed the advantages and drawbacks of conventional as well as emerging leachate treatment process using leachate transfer, biodegradation, physical and chemical methods and membrane processes [2], [5]. It is evident from these thorough reviews that the application of the conventional physicochemical and biological treatment technologies to leachate treatment is hindered not only by insufficient che-at very high temperature without mass transfer limitations.…”

Section: Introductionmentioning

confidence: 99%

“…Issues related to fast membrane fouling and the necessary chemical cleaning procedure, which shortens lifetime and decreases the productivity of the membrane, remain as serious drawbacks. A physicochemical process as a pretreatment step before RO could improve the operation while reducing the frequency of membrane cleaning and consumption of chemicals [10].…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, it must be done through a single process system, not easily affected by variations in waste chemical composition, nor requiring any additional pretreatment operations, such as pH conditioning or ammonia stripping. Lastly, it should not produce an additional byproduct to be further dealt with, such as biological sludge and gases, as occurs in biological treatment processes [2], [5]. All of these criteria could be satisfied by a process known as supercritical water oxidation or SCWO.…”

Section: Introductionmentioning

confidence: 99%

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Landfill leachate treatment by batch supercritical water oxidation

Cardona¹,

Buitrago²,

Acosta

2017

Cien.Ing.Neogranadina

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were measured in the reactor effluent samples and the combined effect of the studied factors was analyzed by means of the Analysis of Variance (ANOVA). Optimal operation conditions for TOC destruction were 400°C, 30 min and 100 % OE, being 500°C, 30 min and 100 % OE for TN destruction. Contrary to what has been reported in similar studies, the results suggest that it is possible to accomplish the simultaneous TOC and TN destruction in leachate wastewater by SCWO treatment at 400°C, 100 % OE and residence times longer than 30 min and without using a catalyst, either in batch or in a continuous process, as long as both the oxidant and the wastewater are mixed and heated together at the reaction temperature.Keywords: Landfill leachate, SCWO, TOC destruction, Total Nitrogen destruction. rEsumENEl tratamiento de lixiviados por medio de diferentes procesos fisicoquímicos y biológicos ha sido ampliamente estudiado. Sin embargo, ningún proceso logra las eficiencias de destrucción requeridas en cuanto a materia orgánica y nitrógeno, razón por la cual el tratamiento se realiza por medio de tecnologías combinadas. La oxidación en agua supercrítica o SCWO, proceso que se lleva a cabo a temperaturas y presiones superiores a las del punto crítico del agua en presencia de una fuente de oxígeno, se ha aplicado exitosamente al tratamiento de distintos tipos de aguas residuales de forma eficiente. Por lo tanto, este trabajo presenta un estudio experimental de la oxidación en agua supercrítica de lixiviados de relleno sanitario en un reactor batch, en el rango de temperatura de 400-500°C, tiempos de reacción de 15 a 30 minutos y excesos de oxígeno (OE) de 100 % a 300 %. Se midieron las eficiencias de destrucción de carbono orgánico total (COT) y nitrógeno total (NT), y se determinó el efecto combinado de los factores estudiados por medio del Análisis de Varianza (ANOVA). Las condiciones de operación óptimas para la destrucción de COT fueron 400°C, 30 min y 100 % OE, y 500°C, 30 min y 100 % OE para el NT. A diferencia de lo reportado en estudios similares, los resultados sugieren que es posible llevar a cabo la destrucción simultánea del COT y el NT en los lixiviados por medio de SCWO a 400°C, 100 % OE y tiempos de residencia de más de 30 min sin usar un catalizador, ya sea en un proceso batch o continuo, siempre y cuando tanto el oxidante como el agua residual se mezclen y se calienten juntos a la temperatura de reacción.Palabras clave: Lixiviados, SCWO, destrucción de COT, destrucción de nitrógeno total.

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Applicability of nanofiltration for the advanced treatment of landfill leachate

Wang

2010

J of Applied Polymer Sci

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Landfill leachates are generated from municipal solid waste landfills under the action of water percolating through the landfilled waste. A treatment system using a combined membrane engineering process was developed to effectively treat the landfill leachate in the Dahanzhuang sanitary landfill (Tianjin, China). The process combines a membrane bioreactor (MBR) and nanofiltration (NF) technology to treat the leachate. The results indicate that the NF system, including the hollow-fiber NF membrane, is an appropriate advanced treatment alternative for landfill leachates. This system provided good removal of chemical oxygen demand and color. The membrane flux renewal reached over 96% after washing with 0.01 mol/L HCl. As a result, the effluent water quality met effluent discharge standards (GB16889-2008).

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Treatment process adapted to stabilized leachates: Lime precipitation–prefiltration–reverse osmosis

Cited by 62 publications

References 44 publications

Removal of organic and inorganic compounds from landfill leachate using reverse osmosis

Removal of organic and inorganic compounds from landfill leachate using reverse osmosis

Landfill leachate treatment by batch supercritical water oxidation

Applicability of nanofiltration for the advanced treatment of landfill leachate

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