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Repairing Nature
Published in Daniel T. Rogers, Environmental Compliance Handbook, 2023
Pump and treat is a groundwater remediation technology that uses pumps to transport contaminated groundwater to the surface, where the contamination is removed. The clean water is either returned to the ground at a different location, discharged to the sewer, or discharged to surface water. The actual removal of contaminants from groundwater depends on the type of contaminant. For instance, if the contaminants are VOCs, the contaminants may be removed by stripping the VOCs from groundwater using air in a vessel called an air stripper, or contaminants may be removed by circulating the contaminated groundwater through containers filled with activated carbon (USEPA 2001h). The VOCs in groundwater become attached or sorb to the activated carbon and are removed from the groundwater.
Remediation
Published in Daniel T. Rogers, Urban Watersheds, 2020
Pump and treat is a groundwater remediation technology that use pumps to transport contaminated groundwater to the surface where the contamination is removed. The clean water is either returned to the ground at a different location, discharged to the sewer, or is discharge to surface water. The actual removal of contaminants from groundwater depend on the type of contaminant. For instance, if the contaminants are VOCs, the contaminants may be removed by stripping the VOCs from groundwater using air in a vessel called an air stripper or contaminants may be removed by circulating the contaminated groundwater through containers filled with activated carbon. The VOCs in groundwater become attached or sorb to the activated carbon and are removed from the groundwater. Figure 12.10 shows an example of a pump and treat system (USEPA 2001h).
Uranium Ore Mill Tailings Management
Published in James H. Saling, Audeen W. Fentiman, Radioactive Waste Management, 2018
James H. Saling, Audeen W. Fentiman
Once the mill tailings are stabilized and material from the tailings ceases to leach into the groundwater, that water can be cleaned. Groundwater contamination will be measured and monitored. Results will be used to conduct a risk assessment, select cleanup methods, and prioritize remediation efforts. Two options are considered for groundwater remediation: (1) letting the water clean itself over time, called natural flushing, and (2) actively treating the water by pumping it out of the ground, removing the contaminants, and returning it to the ground. Groundwater remediation at the Title I sites has not yet begun at most sites and is to be completed by 2014.
Research and application of arsenic-contaminated groundwater remediation by manganese ore permeable reactive barrier
Published in Environmental Technology, 2021
Yao Li, Yongbing Huang, Weishan Wu, Mengmeng Yan, Yiting Xie
As an important part of water resources and even ecosystems, groundwater plays a vital role in the water cycle [1]. According to statistics, more than 50 percent of urban groundwater in China has been seriously deteriorated. In many rural areas, arsenic, lead, chromium and other heavy metals seriously pollute the soil, making the groundwater environment increasingly harsh. Arsenic and arsenide are recognized as carcinogens by the WHO subsidiary ARC, NIEHS, US-EPA and other institutions [2]. In areas where groundwater is used as a source of drinking water, the pollution of high arsenic water has always been a great threat to local residents. Groundwater in 40 counties (flags, cities) of China is contaminated with arsenic, and the residents in these areas mainly drink deep groundwater containing arsenic. About 2.34 million people are affected by the groundwater, and the drinking water with a concentration of arsenic above 50 μg/L has reached 520,000 people [3]. Through the investigation of high arsenic areas in China, it is found that drinking water and groundwater in 13 provinces and regions have suffered from arsenic pollution [4]. At present, groundwater remediation technologies mainly include Pump & Treat (P&T) technology and in situ remediation technology, such as Monitored Natural Attenuation (MNA), Air Sparging (AS), Electric Repair Technology, In Situ Chemical Oxygen (ISCO), Bio-remediation and Permeable Reactive Barriers (PRB) [5].
A review on groundwater contaminant transport and remediation
Published in ISH Journal of Hydraulic Engineering, 2020
P. K. Sharma, Muskan Mayank, C. S. P. Ojha, S. K. Shukla
Groundwater remediation is the process that is used to treat polluted groundwater by removing the pollutants or converting them into harmless products (Tomei and Daugulis 2013). Remedial techniques transfer the contaminants from one phase to another phase and in situ bioremediation offers partial or complete destruction of contaminants. Han et al. (2016) used microscale zero-valent iron (mZVI) reaction zone in situ remediation technology for restoring groundwater contaminated by trichloroethylene (TCE). Some of the newest cleanup technologies use oxidizing solutions, steam, or hot water to remove contaminants from aquifers. These technologies have been researched for a number of years, and are just now coming into widespread use. The generally accepted methods of remediation for cleanup of subsurface contamination are discussed below.