Groundwater leachate

Contaminated groundwater (leachate) should be kept below the root growth zone. Only rainwater or clean irrigation water should meet the needs of plants. 

The harmful liquid that collects at the bottom of a landfill is known as leachate. The generation of leachate is a result of uncontrolled runoff, and percolation of precipitation and irrigation water into the landfill. Leachate can also include the moisture content initially contained in the waste, as well as infiltrating groundwater. Leachate contains a variety of chemical constituents derived from the solubilization of the materials deposited in the landfill and from the products of the chemical and biochemical reactions occurring within the landfill under the anaerobic conditions. 

Lead has been identified in a variety of environmental media (air, surface water, groundwater, leachate, soil, sediment, fish and game animals) collected at 1,026 of the 1,467 current and former NPL hazardous waste sites (HazDat 1998). Lead is the most frequently found metal at hazardous waste sites (Reed et al. 1995). 

No information could be found in the available literature on the bioavailability of endrin aldehyde or endrin ketone. This information would be useful for assessing the potential for exposure to these compounds from various environmental media, particularly in the vicinity of hazardous waste sites where endrin ketone has been found in surface water, groundwater, leachate, soil, and sediment (HazDat 1996). 

Cheremisinoff PN, Gigliello KA, O Neill TK (1989) Groundwater leachate. Technomic Publishing, p 145... 

Tetrachloroethylene has been detected in groundwater leachates from various landfill sites nationwide (Reinhard et al. 1984 Sabel and Clark 1984 Schultz and Kjeldsen 1986). A landfill in New Jersey contained levels up to 590 pg/L (590 ppb) in its leachate (Kosson et al. 1985). Groundwater samples taken from several locations near a sewage effluent disposal site in Massachusetts had levels as high as 980 pg/L (980 ppb) (Barber et al. 1988). A nationwide monitoring study conducted in Japan showed that tetrachloroethylene was common in water supplies of that country (Magara and Furuichi 1986). Tetrachloroethylene was detected in 27% of shallow wells and 30% of deep wells. Concentrations ranged from 0.2 to 23,000 pg/L (0.2 to 23,000 ppb) in shallow wells and from 0.2 to 150 pg/L (0.2 to 150 ppb) in deep wells. 

Groundwater/ leachate Purge at ambient temperature, trap in Tenax/silica, desorb thermally. GC-MSIEPA-CLP Method) 5)lg/L NG EPA 1987a... 

Membrane processes can be used as a pre-treatment step for other remedial technologies. The purpose of the pretreatment would be to concentrate the contaminants to a level that is amenable for specific remedial technologies. For example, organic contaminants in dilute aqueous streams (e.g., groundwater, leachate) can be concentrated to a level that could support an efficient biomass for bioremediation technologies. 

SUBSURFACE BARRIER GROUNDWATER (LEACHATE) EXTRACTION WELL... 

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