Fate of malathion and a phosphonic acid in activated sludge with varying solids retention times

Janeczko, A.; Walters, Edward B.; Schuldt, Steven J.; Magnuson, Matthew L.; Willison, Stuart A.; Brown, Lisa M.; Ruiz, Oscar N.; Felker, Daniel; Racz, LeeAnn

doi:10.1016/j.watres.2014.03.031

Cited by 22 publications

(16 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Three 2.0 L sequencing batch reactors (SBRs) were constructed and operated as described previously Janeczko et al (2014). The SBRs were seeded with activated sludge taken from the Fairborn Water Reclamation Facility, Fairborn, OH.…”

Section: Sequencing Batch Reactorsmentioning

confidence: 99%

“…Peptone (87% of influent COD) and sodium acetate (13% of influent COD) provided the influent COD for the reactors. The feed stock was as described by previously Janeczko et al (2014). During the first 4 months of SBR operation the reactors were monitored for COD, ammonia (NH 3 ), nitrite (NO 2 ), and nitrate (NO 3 ) concentrations in the effluent.…”

Section: Sequencing Batch Reactorsmentioning

confidence: 99%

“…DNA was extracted using the Mo Bio Laboratories, Inc. PowerSoil DNA extraction kit (Mo Bio Laboratories, Inc., Carlsbad, CA) and protocols (Mobio, 2014) and procedures adopted from Janeczko et al (2014). A detailed description of the methods is included in the Appendix.…”

Section: Microbial Community Analysismentioning

confidence: 99%

“…This study focused on the effect of malathion, a surrogate for the CWA VX (Bartelt-Hunt et al, 2008), on an activated sludge system. Janeczko et al (2014) demonstrated that activated sludge can degrade malathion in laboratory-scale bioreactors. There is also circumstantial evidence showing that isolates common to activated sludge can biodegrade malathion (Singh et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…For example, Guo et al (2009) found that malathion can inhibit the hydrolase enzyme responsible for pyrethroid (insecticide) degradation. Janeczko et al (2014) found that 3 mg/L of malathion inhibited COD removal in batch tests with activated sludge, and Pai et al (2009) found that the heterotrophic growth rate constant decreased by 66% in the presence of 0.5 mg/L of malathion. (Tazdait et al, 2013) also reported inhibition of heterotrophic growth by malathion, but at a considerably higher concentration (i.e.140 mg/L) than that of (Pai et al (2009). This study utilized respirometry, a test which measured microbial activity.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

The effect of malathion on the activity, performance, and microbial ecology of activated sludge

Rauglas

Martin

Bailey

et al. 2016

Journal of Environmental Management

View full text Add to dashboard Cite

This study evaluated the effect of a VX (O-ethyl S-[2-(diisopropylamino)ethyl] methylphosphonothioate) surrogate (malathion) on the activity, performance, and ecology of activated sludge bioreactors. In the presence of malathion, the maximum observed respiration rates varied between 43 and 53 μg/O 2 min, generally similar to the 49 μg O 2 /min rates observed in controls. Malathion did not alter the respiration ratio of O 2 consumed-to-CO 2 produced nor did it impact the shape of the oxygen consumption curves during respirometry. Shorter term (12 h) batch tests showed that both chemical oxygen demand (COD) and ammonia removal were not negatively impacted by the presence of 0.1-3 mg/L malathion. Longer term continuous addition (i.e. 40 days) of 0.1 mg/L of malathion also had no effect on COD and ammonia removal. In contrast to shorter term exposures, longer term continuous addition of 3 mg/L of malathion negatively impacted both COD and nitrogen removal and was associated with shifts in the abundance of species that are common to activated sludge. These results illustrate the impact that chemicals like malathion may have on COD removal, and nitrification, as well as the robustness of activated sludge microbial communities.

show abstract

Section: Sequencing Batch Reactorsmentioning

confidence: 99%

Section: Sequencing Batch Reactorsmentioning

confidence: 99%

Section: Microbial Community Analysismentioning

confidence: 99%