Biosorption of organochlorine pesticides using fungal biomass

The biosorption performance of both batch and liquid-solid fluidized bed operations of dead fungal biomass type (Agaricusbisporus ) for removal of methylene blue from aqueous solution was investigated. In batch system, the adsorption capacity and removal efficiency of dead fungal biomass were evaluated. In fluidized bed system, the experiments were conducted to study the effects of important parameters such as particle size (701-1400�m), initial dye concentration(10-100 mg/L), bed depth (5-15 cm) and solution flow rate (5-20 ml/min) on breakthrough curves. In batch method, the experimental data was modeled using several models (Langmuir,Freundlich, Temkin and Dubinin-Radushkviechmodels) to study equilibrium isotherms, the experimental data followed Langmuir model and the results showed that the maximum adsorption capacity obtained was (28.90, 24.15, 21.23 mg/g) at mean particle size (0.786, 0.935, 1.280 mm) respectively. In Fluidized-bed method, the results show that the total ion uptake and the overall capacity will be decreased with increasing flow rate and increased with increasing initial concentrations, bed depth and decreasing particle size.

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Organochlorine Contaminants in Headwater Peatlands, and Selected Estuary Sites of the Moose River

Water Quality Research Journal ◽

10.2166/wqrj.1986.019 ◽

1986 ◽

Vol 21 (2) ◽

pp. 251-256 ◽

Cited By ~ 3

Author(s):

Robert C. McCrea ◽

Greg M. Wickware

Keyword(s):

Atmospheric Deposition ◽

Organochlorine Pesticides ◽

River Basin ◽

Vascular Plants ◽

Typha Latifolia ◽

Coastal Marshes ◽

Surficial Sediments ◽

Organochlorine Contaminants ◽

Hexachlorocyclohexane Isomers ◽

Moose River

Abstract Peatland waters of the Moose River basin, as well as surficial sediments and vascular plants of the estuary were sampled in 1982. Elevated levels of PCBs were found at all five peatland sites; concentrations ranged from 28 to 65 ng/L. Of the seventeen organochlorine pesticides investigated, the hexachlorocyclohexane isomers (a-and y-BHC) were the most prominent with total BHC concentrations ranging from 1.5 to 13.7 ng/L. The presence of these contaminants in ombrotrophic bogs indicated that there was atmospheric deposition of organochlorine contaminants in the basin. Analyses of surficial sediments, collected from tidal flats and coastal marshes, showed that PCBs and organochlorine pesticides were not present. Samples of Triglochin maritima L. seed heads and Typha latifolia L. roots were also free of PCBs.

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Transport of organochlorine pesticides in soil columns enhanced by dissolved organic carbon

Water Science & Technology ◽

10.2166/wst.1997.0270 ◽

1997 ◽

Vol 35 (7) ◽

pp. 139-145 ◽

Cited By ~ 10

Author(s):

Jiann-Yuan Ding ◽

Shian-Chee Wu

Keyword(s):

Organic Carbon ◽

Dissolved Organic Carbon ◽

Organochlorine Pesticides ◽

Transport Model ◽

Phase Model ◽

Soil Columns ◽

Two Phase ◽

Three Phase ◽

Phase Transport ◽

Remediation Of Soil

The objective of this study is to quantify the effects of humic acid solution infiltration on the transport of organochlorine pesticides (OCPs) in soil columns using a three-phase transport model. From experimental results, it is found that the dissolved organic carbon enhances the transport of OCPs in the soil columns. In the OCPs-only column, the concentration profiles of OCPs can be simulated well using a two-phase transport model with numerical method or analytical solution. In the OCPs-DOC column, the migrations of aldrin, DDT and its daughter compounds are faster than those in the OCPs-only column. The simulation with the three-phase model is more accurate than that with the two-phase model. In addition, significant decrease of the fluid pore velocities of the OCPs-DOC column was found. When DOC leachate is applied for remediation of soil or groundwater pollution, the decrease of mean pore velocities will be a crucial affecting factor.

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