Environmental degradation pathways for the breakdown of polydimethylsiloxanes

Chemical Oxygen Demand Removal Efficiency and Limited Factors Study of Aminosilicone Polymers in a Water Emulsion by Iron–Carbon Micro‐Electrolysis

“…So, we could draw another conclusion as an explanation that the aminosilicone polymers encapsulate on the surface of activated carbon and iron chips should be a limited factor to influence the COD removal efficiency of the micro-electrolysis. Similar explanations from PDMS were also reported that the PDMS polymers can encapsulate microorganisms during wastewater treatment and lead to the inhibition of biodegradation reactions (Stevens, 1998;Singh et al, 2000;Teixeira et al, 2005).…”

“…Silicone compounds are nonbiodegradable. For example, silicone biodegradation was not observed in water resource recovery facilities because of the siliconoxygen bond, which is resistant to enzymatic attack Stevens, 1998). Biodegradation of silicon-carbon bond also seems to be difficult (Anderson et al, 1987).…”

“…No 14 CO 2 was detected in the gas phase, indicating that no biodegradation occurred during the wastewater treatment process. Analysis of sludge from a number of water resource recovery facilities revealed that PDMS concentrations in sludge were between 300 and 5000 mg/kg (on a dry weight basis) (Fendinger, 1996;Stevens, 1998).Depending on where the sludge is generated in the European Union, the primary routes for disposal are landfill, incineration, or use as a soil amendment (Hall and Dalimier, 1994). All of these disposal methods could present a potential threat to the environment (Teixeira et al,2003).…”

Properties, performance and associated hazards of state-of-the-art durable water repellent (DWR) chemistry for textile finishing

“…The hydrolysis rate of PDMS is controlled by soil moisture, where the hydrolysis takes place more rapidly with lower moisture content, or when the weather is hot and dry (Lehmann et al, 1998). DMSD can further biodegrade to silicic acid [Si(OH) 4 ], due to the oxidation of the methyl groups of DMSD (Stevens, 1998), or can be released into the atmosphere since DMSD is relatively volatile (Lehmann and Miller, 1996).…”

Photo‐Fenton Remediation of Wastewaters Containing Silicones: Experimental Study and Neural Network Modeling

“…As a consequence, waterborne silicones will end up and accumulate in the environment, adsorb and deposit in sediments [8]. Silicone polymer fluids are therefore considered as environmentally persistent substances [5,9]. Their increased use and the need for effective treatment processes for silicone-containing wastewater has therefore become a matter of environmental importance.…”