In situ air sparging (IAS) is a remediation technology primarily applied for the removal of volatile organic compounds (VOCS) from groundwater aquifers. Conceptually, IAS is simple: clean air is injected into the aquifer beneath the water table to induce mass transfer of VOCS to the vapor phase. The technology also has application for destruction of volatile and semi-volatile compounds due to bio-stimulation in the aquifer resulting from groundwater oxygenation. This document was developed to provide information to site managers on the feasibility of installing an IAS system and its design and operation. The document was prepared primarily from a review of existing literature and an evaluation of data detailing IAS systems at 59 sites. The site data was supplied by American Petroleum Institute (API) member companies and environmental consultants.<\/p>\n
The key to IAS success is the ability to design and operate a system to achieve effective contact between the sparge air and the target organic compound. IAS appears to work best in uniform coarser grained materials (gravels and sands) where air flow distribution is more predictable and is largely due to buoyancy. Due to the current level of understanding of IAS technology, the radius of influence (ROI) of an IAS well is determined on an empirical basis. The ROI is generally evaluated based on changes in a number of physical, chemical or biological monitoring parameters. Each of the monitoring parameters have potential limitations. From a review of the API-IAS Database, the radius of influence of an IAS well generally falls within the range of 10 to 25 feet.<\/p>\n
Presently, very limited reliable data are available on the performance of IAS systems. The mechanisms governing air channel distribution and associated groundwater movement are not well understood. Additional research is needed to further evaluate the factors governing the successful operation of IAS systems and to provide a higher level of confidence in the prediction of required treatment times and the degree to which IAS can be expected to reduce hydrocarbon mass in the subsurface.<\/p>\n","protected":false},"excerpt":{"rendered":"
In Situ Air Sparging: Evaluation of Petroleum Industry Sites and Considerations for Applicability, Design and Operation<\/b><\/p>\n\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n API<\/b><\/a><\/td>\n 1995<\/td>\n 132<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":487673,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2642],"product_tag":[],"class_list":{"0":"post-487662","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-api","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/487662","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/487673"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=487662"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=487662"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=487662"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}