Biochar, the solid residual remaining after the thermochemical transformation of biomass for carbon sequestration, has been proposed to be used as a soil amendment, because of its agronomic benefits. The effect of amending soil with six biochars made from different feedstocks on the sorption and leaching of fluometuron and 4-chloro-2-methylphenoxyacetic acid (MCPA) was compared to the effect of...

Pesticides and their residues frequently contaminate surface waters and groundwater so consequently there is a great need to identify methods and practices that reduce such contamination. This thesis examined the potential of a ‘bioprophylactic’ concept based on the hypothesis that diffuse contamination after application in the field can be significantly reduced if pesticides are degraded as ra...

Cederlund H. 2006. The microbiology of railway tracks – towards a rational use of herbicides on Swedish railways. Doctoral thesis. Swedish railways are regularly treated with herbicides in order to keep the track beds free from weeds. However, finding appropriate preparations and dosages that provide a good weed control but that are still environmentally acceptable, has proven to be difficult. ...

The soil moisture content can vary the behavior of biochemical activity and its incidence on herbicides. objective this manuscript was to assess, under controlled laboratory conditions, whether a prolonged 75-day drought affect 4-chloro-2-methylphenoxyacetic acid (MCPA) herbicide properties in three agricultural soils (Typic Xerofluvent, SA, Typic Haploxeralf, SB, Vertic Chromoxert, SC). During...

in the last twenty years, due to a number of natural and anthropogenic reasons, many water sources have become poorer in quality with respect to micropollutants. an example of a micropollutant that needs to be removed is the chlorophenoxypropionic herbicide mecoprop (mcpp). mcpp is one of the nine pesticides used as an indicator to monitor pesticide concentrations in rivers because it is freque...

Phenoxyalkanoic compounds are used worldwide as herbicides. Cupriavidus necator JMP134(pJP4) catabolizes 2,4-dichlorophenoxyacetate (2,4-D) and 4-chloro-2-methylphenoxyacetate (MCPA), using tfd functions carried on plasmid pJP4. TfdA cleaves the ether bonds of these herbicides to produce 2,4-dichlorophenol (2,4-DCP) and 4-chloro-2-methylphenol (MCP), respectively. These intermediates can be deg...

The present work discusses the influence of additives, designated as co-adjuvants agents chemical activation, containing nitrogen on their structure, activated carbons (ACs) produced from waste polyethylene terephthalate (PET) and cork by with KOH, at 973 K. used were urea, 2-chloro-4,6-diamino-1,3,5-triazine, (2-hydroxyethyl) urea polyethylenimine. ACs, PET, only KOH presented a porous volume ...

BACKGROUND Sorption and biodegradation are the primary processes of organic pollution remediation in aquatic and soil/sediment environments. While researchers have substantially reported their findings regarding these processes, little attention has been given to description of experimental apparatus. This technical paper aims to present the development and detailed design of a fixed-bed column...