Recirculation of reverse osmosis concentrate in lab-scale anaerobic and aerobic landfill simulation reactors

Morello, Luca; Cossu, Raffaello; Raga, Roberto; Pivato, Alberto; Lavagnolo, Maria Cristina

doi:10.1016/j.wasman.2016.07.030

Cited by 31 publications

(11 citation statements)

References 26 publications

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“…All the landfills currently operating are sanitary landfills equipped with landfill gas collection, energy recovery and a leachate collection system. Leachate treatment is performed both on site and off site (Di Maria and Sisani, 2017;Di Maria et al, 2018;Morello et al, 2016;Spagni et al, 2008).…”

Section: Landfillmentioning

confidence: 99%

Waste Management in Developed and Developing Countries: The Case Study of Umbria (Italy) and the West Bank (Palestine)

Maria

Lovat²,

Caniato³

2018

Detritus

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A survey and a preliminary comparison were conducted between the waste management systems and schemes implemented in the Region of Umbria (Italy) and the West Bank (Palestine). The Region of Umbria operates in a wider political legal and economic supporting scheme, i.e., the one promoted by EU Directives. The West Bank showed all the typical economic, legal and political features of a developing country. From the economic point of view the incidence of the cost for waste collection and management with respect to the per capita GDP was 0.82% for the Region of Umbria and 1.2% for the West Bank. Although the incidence for the West Bank was higher, it was not enough to support the budget necessary for efficient waste management. A relevant aspect was the practically similar amount of organic waste generated per capita and per year in the two areas. The West Bank lacks infrastructures and adequate collection systems and there are no composting facilities. The number of mechanical sorting facilities was 0.034/10 5 inhabitants. The current recycling rate for the West Bank is about 6%. Some criticism about the sustainability of recycling and composting rates for the Region of Umbria are also highlighted. Some benefits for the West Bank, such as the introduction of home composting, are identified. This will affect both the amount and the costs of waste collected allowing the municipalities to allocate more money for separated collection of recyclables.

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Section: Landfillmentioning

confidence: 99%

Waste Management in Developed and Developing Countries: The Case Study of Umbria (Italy) and the West Bank (Palestine)

Maria

Lovat²,

Caniato³

2018

Detritus

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“…This concentrate is usually characterized by low biodegradability, high specific ultraviolet absorbance (SUVA) [10,11], and high concentration of inorganic and bio-recalcitrant organic compounds. Therefore, its treatment by conventional biological processes [12] is not possible, and the concentrate is recirculated back to the landfill in most of the cases [13,14]. This reinjection increases the content of persistent organic compounds, salts, nitrogen, and phosphorous in the leachate [15], which then increases membrane fouling and progressively limits the efficiency of the treatment in the medium to the long term [16].…”

Section: Introductionmentioning

confidence: 99%

Assessing an Integral Treatment for Landfill Leachate Reverse Osmosis Concentrate

et al. 2020

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An integral treatment process for landfill leachate reverse osmosis concentrate (LLROC) is herein designed and assessed aiming to reduce organic matter content and conductivity, as well as to increase its biodegradability. The process consists of three steps. The first one is a coagulation/flocculation treatment, which best results were obtained using a dosage of 5 g L−1 of ferric chloride at an initial pH = 6 (removal of the 76% chemical oxygen demand (COD), 57% specific ultraviolet absorption (SUVA), and 92% color). The second step is a photo-Fenton process, which resulted in an enhanced biodegradability (i.e., the ratio between the biochemical oxygen demand (BOD5) and the COD increased from 0.06 to 0.4), and an extra 43% of the COD was removed at the best trialed reaction conditions of [H2O2]/COD = 1.06, pH = 4 and [H2O2]/[Fe]mol = 45. An ultra violet-A light emitting diode (UVA-LED) lamp was tested and compared to conventional high-pressure mercury vapor lamps, achieving a 16% power consumption reduction. Finally, an optimized 30 g L−1 lime treatment was implemented, which reduced conductivity by a 43%, and the contents of sulfate, total nitrogen, chloride, and metals by 90%. Overall, the integral treatment of LLROC achieved the removal of 99.9% color, 90% COD, 90% sulfate, 90% nitrogen, 86% Al, 77% Zn, 84% Mn, 99% Mg, and 98% Si; and significantly increased biodegradability up to BOD5/COD = 0.4.

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“…The literature presents works on the impact of concentrate recirculation on the quality of leachates and indicates an increase in the value of COD, ammonium nitrogen and an increase in salinity in raw landfill leachates. As a consequence, this negatively affects the efficiency of the RO installation itself and reduces the value of impurity retention coefficients [6,24]. Another solution to the concentrate problem is their disposal or economic use.…”

Section: Treatment Of the Concentrate From The Membrane Separation Prmentioning

confidence: 99%

Treatment and Utilization of the Concentrate from Membrane Separation Processes of Landfill Leachates

Nowak

Włodarczyk‐Makuła

2020

Civil and Environmental Engineering Reports

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The purpose of the paper was to assess the effectiveness of selected physico-chemical processes to improve the quality of retentates/concentrates obtained during the treatment of landfill leachates using membrane separation. Among the physico-chemical methods, Advanced Oxidation Process (AOP) and electrocoagulation were analysed. Landfill leachate resulting from the infiltration of waste mass by atmospheric precipitation as well as the dissolution and leaching of waste components are most often subjected to membrane separation. Permeate is usually discharged to the receiver, while the concentrate is recirculated and sprinkled on a waste pile. However, such action is only the retention of impurities in the body of the landfill and has an impact on the chemistry of raw leachates. Due to the very high concentrations of organic and inorganic compounds identified in the retentate, it is necessary to treat it, which will effectively reduce the amount of impurities in the leachate. Economic use seems to be another solution. An example would be growing energy crops but such application requires additional research.

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Recirculation of reverse osmosis concentrate in lab-scale anaerobic and aerobic landfill simulation reactors

Cited by 31 publications

References 26 publications

Waste Management in Developed and Developing Countries: The Case Study of Umbria (Italy) and the West Bank (Palestine)

Waste Management in Developed and Developing Countries: The Case Study of Umbria (Italy) and the West Bank (Palestine)

Assessing an Integral Treatment for Landfill Leachate Reverse Osmosis Concentrate

Treatment and Utilization of the Concentrate from Membrane Separation Processes of Landfill Leachates

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