Treatment of Landfill Leachate using Limestone/Sandstone Filters Under Aerobic Batch Conditions

Abstract

The suitability of a passive technology, consisting of filters composed of a mixture of limestone and sandstone rocks, for the treatment of landfill leachates containing 6.6 mg L^ˉ1 iron and 1.8 mg L^ˉ1 manganese were investigated. The limestone and the limestone/sandstone filters successfully removed iron from the prepared solutions. The filters removed on average a minimum of 97.60% of the iron from solution on a daily basis. The removal of manganese from solution was not as efficient as iron removal. The filters removed between 22.22% and 100% of the manganese from solution. Neither the filter type nor the solution type affected the iron and manganese removal efficiencies. Although iron precipitate was evident during the 7 day experimental period, armoring did not affect the removal efficiency of the elements. The pH of the water samples did not exceed 7.7. Therefore, the wetland ecosystem should be able to adjust to water having a slightly higher pH without suffering adverse effects

Determination of Sequencing Batch Reactor (SBR) Performance in Treatment of Composting Plant Leachate

“…5 and COD were 98% and 94%, respectively (14). While in our study, the average removal efficiencies of BOD 5 and COD were lower due to the presence of interfering matters in the leachate such as nitrogen compounds, volatile fatty acids, heavy metals, ammonium, toxic, and pharmaceutical substances which inhibit biological activity. Hajiabadi et al (2009) showed that COD removal efficiency was above 97% in treatment of strong synthetic wastewater in SBR reactor in different cell residence times (CRT).…”

“…The sludge from aeration basin of municipal wastewater treatment plant in the north of Isfahan was used for seeding the aerobic reactor. During this study, COD, SCOD, rbCOD, BOD 5 , TKN, and TP parameters were analyzed, while DO, pH, and temperature parameters were controlled.…”

“…The organic loading rate (OLR) increased from 0.25 to 6.3 gCOD/L.d in 11 runs during the 280-day study period. To determine the reactor performance during the period, COD, SCOD, rbCOD, BOD 5 , TKN, and TP were measured in accordance with procedures provided in standard methods. In this study, the average amounts of the influent COD, BOD 5 , TKN, TP, EC, and pH were 95.5, 55.2, 2.3, 0.28 (g/L), 33.5 (ms/cm), and 4.4, respectively.…”

“…In a study on WAO, WPO, and a combination of WAO/GAC processes for organic matter removal from leachate of Isfahan composting factory under different conditions carried out by Ehrampoush et al (2011), the results showed that the combined process had higher efficiency than two other methods while BOD 5 /COD ratio was achieved as 90% (7). Diamadopoulos et al (1997) showed that BOD 5 and COD removal efficiencies in the treatment of mixed landfill leachate and domestic sewage in SBR were 98.7% and 85.5%, respectively (23). Schwarzenbeck et al The results of this study on removal efficiencies are consistent with the results of other studies, while in some cases our reactor showed lower performance probably due to the nature of leachate and presence of various impurities and pollutants.…”

“…One of these methods is composting in which leachate is produced as 100 liters per ton of waste production (3). Municipal solid waste leachate, a very strong wastewater, contains a large amount of priority pollutants (carcinogens), pathogenic organisms, persistent organic compounds, and heavy metals (4)(5)(6). Therefore, special attention should be paid to control, collection, treatment, and disposal of this pollutant, while the lack of an appropriate method for its treatment, collection, and disposal causes severe contamination of soil, groundwater, and surface water to persistent and toxic organic compounds, nitrogen compounds, aromatic and phenolic compounds.…”