Mobilization of manufactured gas plant tar with alkaline flushing solutions.

Environmental Science & Technology
S C HauswirthC T Miller


This experimental study investigates the use of alkaline and alkaline-polymer solutions for the mobilization of former manufactured gas plant (FMGP) tars. Tar-aqueous interfacial tensions (IFTs) and contact angles were measured, and column flushing experiments were conducted. NaOH solutions (0.01-1 wt.%) were found to significantly reduce tar-aqueous IFT. Contact angles indicated a shift to strongly water-wet, then to tar-wet conditions as NaOH concentration increased. Column experiments were conducted with flushing solutions containing 0.2, 0.35, and 0.5% NaOH, both with and without xanthan gum (XG). Between 10 and 44% of the residual tar was removed by solutions containing only NaOH, while solutions containing both NaOH and XG removed 81-93% of the tar with final tar saturations as low as 0.018. The mechanism responsible for the tar removal is likely a combination of reduced IFT, a favorable viscosity ratio, and tar bank formation. Such an approach may have practical applications and would be significantly less expensive than surfactant-based methods.


Dec 10, 1999·Journal of Pharmaceutical Sciences·H Sah
Jun 21, 2001·Environmental Science & Technology·J ZhengS E Powers
Feb 6, 2002·Environmental Science & Technology·Varadarajan DwarakanathGary A Pope
Jul 24, 2002·Archives of Pharmacal Research·Hongkee SahChul-Soon Yong
Sep 19, 2002·Journal of Contaminant Hydrology·Steven W Giese, Susan E Powers
Apr 10, 2003·Journal of Contaminant Hydrology·Christina Eberhardt, Peter Grathwohl
Aug 7, 2003·Environmental Science & Technology·Jianzhong Zheng, Susan E Powers
Aug 30, 2011·Journal of Contaminant Hydrology·P Schultz BirakC T Miller

❮ Previous
Next ❯


Aug 21, 2012·Environmental Science & Technology·Scott C HauswirthCass T Miller
Sep 6, 2014·Journal of Contaminant Hydrology·Scott C Hauswirth, Cass T Miller
May 27, 2017·Environmental Science & Technology·Li WangDayi Deng
Oct 14, 2018·Journal of Contaminant Hydrology·Saeid ShafieiyounMike Marley
Sep 9, 2020·Journal of Contaminant Hydrology·Scott C HauswirthCass T Miller

❮ Previous
Next ❯

Related Concepts

Trending Feeds


Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.


Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.


Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.