Treatment of landfill leachate by reverse osmosis
Angelo Chianese1999, Water Research
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Abstract
ÐThis paper deals with an experimental study describing the treatment of land®ll leachate by means of a pilot-scale reverse osmosis unit. Leachate streams with a CO parameter in the range of 0± 1749 mg l À1 have been adopted. The¯ux rate of the permeate through the membrane decreased linearly with the COD factor. The rejection coecient of COD was practically independent of the COD value, but was signi®cantly aected by the applied pressure. By operating at 53 atm, COD rejection values around 98% were obtained. Finally, the eect of COD on the separation of some heavy metals was investigated. For most metals this in¯uence was negligible. Only the rejection coecient of Zn decreased signi®cantly upon increasing the COD of the leachate stream.
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E3S Web of Conferences
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Landfill Leachate Treatment A Case Study for
One of the most important problems arising from landfilling solid wastes is the leachate which contains high amount of pollution. Discharge of leachate without treatment causes negative effects on environmental and public health. In this study, parameters of chemical oxygen demand (COD), total nitrogen (TN), ammonia nitrogen (NH 4 -N), and total phosphorus (TP) were examined in the samples taken from the influent and effluent of leachate treatment plant, where Odayeri landfill leachate is treated. Obtained results showed that the treatment plant, which consisted of preanoxic biological treatment system, ultrafiltration (UF) and nanofiltration (NF) units were operating with high efficiency. Among the examined parameters during study, COD, TN, NH 4 -N, and TP were found to be treated at the rate of 99, 94.5, 99, and 93.8%, respectively. Landfilling is increasing rapidly in the world and this consequently brings the need of leachate treatment facilities. Therefore, this study is considered to be a guide for construction and operation stages of proposed new treatment plants.
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Research Square (Research Square), 2023
The moisture content of municipal solid waste (MSW) and local precipitation events lead to the leachate generation from MSW land lls. The high concentration of organic pollutants in land ll leachate makes it hazardous, requiring treatment before disposal into the environment. Land ll Leachate is most commonly treated by reverse osmosis (RO), which generates large volumes of wastewater termed as RO reject. This investigation aims to stabilize the RO reject through an inexpensive and effective bioremediation strategy. A bench-scale aerobic suspended growth reactor study was conducted using three commercial conversion agents, namely EM.1, Bokashi powder, and coir pith powder. Overall benchscale e cacy of 63% was achieved in this study. The onsite studies were conducted in 7.5 kL arti cial ponds with 46% e cacy amid atmospheric in uences and constraints. In contrast, the control pond with no conversion agents showed an increase in pollution concentration over the 100 days of retention time. The ndings revealed that the investigated technology had a marginally lower evaporation rate and performed relatively well compared to traditional solar evaporation ponds. Moreover, the technology can be easily scaled-up and readily applied for RO reject treatment in MSW land lls.
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