Treatment of young and stabilized landfill leachate by integrated sequencing batch reactor (SBR) and reverse osmosis (RO) process

Tałałaj, Izabela Anna; Bartkowska, Izabela; Biedka, Paweł

doi:10.1016/j.enmm.2021.100502

Cited by 27 publications

(17 citation statements)

References 54 publications

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“…[ 24 ] Therefore, it is necessary to find the optimal pH and coagulant dosage to increase the overall efficiency of the treatment process. [ 25 ] Effect of sodium ferrate loading on extent of COD removal was studied using different values of loadings.…”

Section: Methodsmentioning

confidence: 99%

“…Advanced oxidation process is a combination of strong oxidants such as ozone and hydrogen peroxide, ultraviolet, ultrasonic, and catalysts such as intermediate metal ions. [ 25 26 ] The application of ultrasound is considered a possibility in wastewater treatment for several decades. This technology can remove contaminants through thermal decomposition and/or as a result of chemical reactions with free radicals produced inside cavitation bubbles, and it often leads to higher COD removal efficiency compared to other AOPs methods.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of chemical oxygen demand and color removal from leachate using coagulation/flocculation combined with advanced oxidation process

et al. 2022

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Background: One of the basic practices in the field of waste management is the collection and treatment of leachate. Leachate from municipal waste due to high chemical oxygen demand (COD) and dark color is a potential pollutant of the environment, which causes a lot of problems in the absence of treatment and direct discharge to the environment. This study aimed to determine the efficiency of ultrasonic process in combination with coagulation and flocculation process using sodium ferrate in COD and color reduction. Materials and Methods: In this experimental study, all experiments were performed in batch conditions and with changing process variables such as pH and sonication time, and the effect of three parameters, including ultrasonic reaction time (15, 30, and 45 min), pH (2, 4, 5/5, and 7), and coagulant dosage (from 1 to 150 g/l) on the COD reduction and color removal, was evaluated. Coagulant concentration and then the removal efficiency of COD and color were analyzed by ANOVA using SPSS 18. Results: The COD reduction and color removal were 87.05% and 88.6% in optimal condition (using 120 g/L of sodium ferrate at pH 5.5), with coagulation/flocculation, after ultrasound (15 min). Ultrasound (15 min) + sodium ferrate (without coagulation/flocculation) achieved 46.25% of COD reduction and 90.35% of color elimination, whereas the ultrasonic process alone allowed removing the COD and color in the leachate by less than 50%. Conclusion: The results indicate that C–F followed by ultrasonic can be used to efficiently reduce the organic matter and color from municipal waste leachate, and it would be an ideal option for leachate treatment.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of chemical oxygen demand and color removal from leachate using coagulation/flocculation combined with advanced oxidation process

et al. 2022

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“…Among the most innovative techniques worth noting is the technology of treating filtrate using an integrated reactor (SBR), the reverse osmosis (RO) process described in [26], and the application of promising membrane technologies proposed in [25]. However, in the analyzed works [25,26], the authors to a greater extent consider the options for cleaning already contaminated natural components while paying minimal attention to the neutralization and reduction of the amount of landfill filtrate released into the environment. In addition, the complex issue of increasing the environmental hazard of filtrate in case of fires in waste storage areas remains ignored.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Devising the technology for localizing environmental pollution during fires at spontaneous landfills and testing it in the laboratory

Bondarenko¹,

Dudar

Yavorovska

et al. 2021

EEJET

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This paper reports an analysis of current issues related to storing solid household waste, and, specifically, the problem of environmental pollution when unsorted solid household waste (SHW) is ignited. A technology has been developed to improve environmental safety and ensure a reduction in the anthropogenic load on the atmosphere, hydrosphere, and lithosphere in the event of fires at the sites of solid waste storage. The operation of the proposed equipment, taking into consideration all the provided operating modes and additional options, is energy-saving and automated (or semi-automatic), which makes it especially relevant under modern conditions. The technology significantly improves the efficiency of the processes to eliminate the ignition of SHW and localize their environmental consequences for the territories adjacent to landfills. Laboratory tests were carried out, which proved the effectiveness of practical application for the designed equipment of a new environmentally active adsorption mixture for the purpose of cleaning the waste filtrate, as well as its use for the formation of an anti-filtration screen in the mound of SHW. Experiments have shown that the tested sample of the aqueous suspension of the proposed environmentally active mixture adsorbs calcium (by 92 %), overall iron (by 91 %), overall phosphorus (by 75 %), zinc (by 31 %), and ammonium (by 19 %). This leads to a decrease in the overall toxicity of the solution and indicates the possibility of improving the environmental safety of waste fires when operating the proposed technical solution by purifying the filtrate released during fires in landfills. The reported results, specifically, the technology for localizing the environmental consequences of uncontrolled waste ignition could be used in the process of modernizing the technical support for sanitary treatment schemes in urban areas.

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“…Value pH of 8.0 favors the deprotonation of H + ions from humic substances present in the leachate and makes membrane charge more negatively than at lower values of pH. This causes an increase in electrostatic repulsion between organic matter and membrane, limiting the fouling phenomenon [ 31 – 33 ].…”

Section: Introductionmentioning

confidence: 99%

Performance of integrated sequencing batch reactor (SBR) and reverse osmosis (RO) process for leachate treatment: effect of pH

Tałałaj

2022

J Environ Health Sci Engineer

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Purpose In this paper the performance and effectiveness of the reverse osmosis (RO) process for the biologically pretreated leachate was investigated. The RO process was carried out separately for two different pH: 8.0 and 9.3. Methods A general pollution parameters as well as organic and inorganic indicators were determined in raw, biologically pretreated and RO treated leachate. The performance characteristics of the reverse osmosis system were made on the basis of permeate flux, electroconductivity removal rate, concentration factor and efficiency in removal of analyzed parameters. Results The use of SBR pretreatment had very good efficiency in BOD (97.3%) and ammonia nitrogen (95.4%) removal. The lowest effectivity was observed for chloride (11.6%), boron (3.9%) and TDS (1.2%). Pretreated leachate was subjected to RO system. The normalized average flux was 0.53 (42.3 L/m2·h) for pH = 8.0 and 0.68 (33.5 L/m2·h) for pH = 9.3. The lower membrane fouling at higher pH can be explained by electrostatic repulsion between the negatively charged membrane surface and organic substances. Independently of the process pH, a two-step membrane fouling was observed. The greatest differences in removal rates were observed for boron, which had a higher retention rate at higher pH, and ammonia nitrogen, whose removal rate decreased at higher pH. The obtained permeate pH after RO process was lower than the feed pH in two analyzed value of pH. Conclusions The higher flux value at pH = 9.3 is result of high content of organic matter in leachate, which is better rejected at higher pH because of higher electrostatic repulsion between organic matter and membrane surface. This indicates that the organic matter content should be taken into account when determining the operating parameters (pH values) of the RO system.

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Treatment of young and stabilized landfill leachate by integrated sequencing batch reactor (SBR) and reverse osmosis (RO) process

Cited by 27 publications

References 54 publications

Evaluation of chemical oxygen demand and color removal from leachate using coagulation/flocculation combined with advanced oxidation process

Evaluation of chemical oxygen demand and color removal from leachate using coagulation/flocculation combined with advanced oxidation process

Devising the technology for localizing environmental pollution during fires at spontaneous landfills and testing it in the laboratory

Performance of integrated sequencing batch reactor (SBR) and reverse osmosis (RO) process for leachate treatment: effect of pH

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