Sorption mechanism of DDT from aqueous phase

Keerthinarayana, S.; Vijayashankar, Y. N.; Shivalingaiah, B.; Visweswariah, K.

doi:10.1080/03601239009372702

Cited by 3 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…High organic content materials have higher Kd values for DDT and DDTR than sand or similar low carbon materials. For example, the Kd DDT for pine bark and wood charcoal is 220.5 [56] and 843.1 L/kg [11], respectively. However, the Kd DDT of Montcalm Sandy Loam, though it contains relatively high (0.99 %) carbon, is only 0.13 L/kg [93].…”

Section: In Situ Capmentioning

confidence: 99%

Remediation of DDT and Its Metabolites in Contaminated Sediment

Chattopadhyay

Chattopadhyay²

2015

Curr Pollution Rep

View full text Add to dashboard Cite

Chlorinated pesticides and chlorinated organics can be transformed or partially degraded in sediments under appropriate environmental conditions. Although 1,1,1-trichloro-2,2-bis[p-chlorophenyl]ethane (DDT) is very persistent in the environment, 1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene (DDE), a degradation product of DDT, is generally the constituent most widely detected in the environment and DDE is also resistant to further biotransformation. DDT and its degradation products (DDTR) may be transported from one medium to another by sorption, bioaccumulation, dissolution, or volatilization. In sediments, DDT strongly adheres to suspended particles, but once metabolized, DDE, the primary product, is slightly soluble in water. The major migration process for DDTR in sediment-water systems is sorption to sediment or other organic matter and the primary distribution route is the transportation of the particulates to which the compound is bound. Understanding the fate and transport of DDTR in the natural environment based on its specific characteristics is important in determining appropriate remediation option. Common DDT-contaminated sediment remediation options include dredging, capping, and natural attenuation. Sediment washing and phytoremediation have also been used in contaminated sites. Dredging is the most common sediment remediation option to remove the contaminated benthic sediments but often suffers from technical limitations like incomplete removal, unfavorable site conditions, sediment resuspension, and disposal issues. Capping is an in situ, lowcost remediation option for immobilization of DDT in several contaminated sediment sites. Natural or anthropogenic materials containing reactive ingredients, as distinct from a conventional sand or gravel cap, involve placing reactive materials as part of the cap matrix to increase sorption, and to enhance chemical reactivity with DDTR, or accelerate degradation. Natural attenuation can treat the DDT-contaminated sediment, but the time frame for complete remediation may be relatively long. Addition of suitable co-metabolites and acclimatized microorganisms to DDTR-contaminated sediment and alteration of sediment-water micro-environment by manipulating soil pH, moisture content, and other chemical conditions may result in degradation of DDTR associated with sediments at rates faster than the natural attenuation rate.

show abstract

Section: In Situ Capmentioning

confidence: 99%

Remediation of DDT and Its Metabolites in Contaminated Sediment

Chattopadhyay

Chattopadhyay²

2015

Curr Pollution Rep

View full text Add to dashboard Cite

show abstract

“…Ref. 18, also noted such an equilibrium phenomenon and attributed it to an equilibrium being attained between the DDT in solution, DDT adsorbed in surfaces and the DDT volatilized in the ambient air.…”

Section: At 1 Ppm Ddt Concentrationmentioning

confidence: 94%

Effects of Faujasite X and Y Zeolites on the 1,1,1-Trichloro-2,2′ bis(p-chlorophenyl)ethane (DDT) Degradation during Water Purification

Kowenje¹

2013

IJEPP

View full text Add to dashboard Cite

The ability of zeolites to abstract and denature organochloride pesticides finds application in water purification practices. In this study, activated faujasite X and Y zeolites were separately exposed to 1, 2 and 4 ppm concentrations of 1,1,1-trichloro-2,2' bis(p-chlorophenyl) ethane (dichloro dipheny trichloroethane-DDT) water solutions. For the 1 ppm DDT solutions, the resultant degradation products and residual DDT were minimal with concentrations in zeolite treatments reducing to below detection limit (0.005 ppm) in about 2 hours. In addition, the rate of dissipation was found to somewhat depend on the levels of DDT concentration and the type of zeolite used. The main degradation product in samples exposed to faujasite X was dichloro dipheny dichloroethylene (DDE) whereas in the faujasite Y exposed samples, both the DDE and dichloro diphenyl dichloroethane (DDD) were obtained.

show abstract