11,313
edits
Changes
Jump to navigation
Jump to search
== Dioxins and Furans in San Francisco Sewage Sludge ==
San Francisco's Pretreatment Program Semi-Annual Report, covering the third and fourth quarters of 2009, tested San Francisco's sewage sludge from its Southeast and Oceanside plants. The report notes the following levels of dioxins:
* Total Tetradioxin: 30.4ppt at Southeast, 54.7ppt at Oceanside.
* Total Pentadioxin: 250ppt at Southeast, 394ppt at Oceanside.
* Total Hexadioxin: 127ppt at Southeast, 171ppt at Oceanside.
* Total Heptadioxin: 962ppt at Southeast, 1500ppt at Oceanside.
* Total Tetrafuran: 76.4ppt at Southeast, 68.5ppt at Oceanside
* Total Pentafuran: 84.5ppt at Southeast, 69.2ppt at Oceanside
* Total Hexafuran: 122ppt at Southeast, 114ppt at Oceanside
* Total Heptafuran: 246ppt at Southeast, 283ppt at Oceanside
Specific chemicals found were: [[1,2,3,6,7,8-hexachlorodibenzo-p-dioxin]], [[1,2,3,7,8,9-hexachlorodibenzo-p-dioxin]], [[1,2,3,4,6,7,8-heptachlorodibenzo-p-dioxin]], [[octachlorodibenzo-p-dioxin]], [[2,3,7,8-tetrachlorodibenzofuran]], [[1,2,3,4,6,7,8-heptachlorodibenzofuran]], [[1,2,3,4,7,8,9-heptachlorodibenzofuran]], and [[octochlorodibenzofuran]].
SW: remove section on Sf sludge for the time being
== Unusual Dioxins From Triclosan ==
The antibacterial agent [[triclosan]], commonly found in antibacterial soaps and other household products, can break down into a number of dioxins in the environment, including [[2,8-dichlorodibenzo-p-dioxin]] (2,8-DCDD), [[2,3,7-trichlorodibenzo-p-dioxin]] (2,3,7-TCDD), [[1,2,8-trichlorodibenzo-p-dioxin]] (1,2,8-TriCDD), and [[1,2,3,8-tetrachlorodibenzo-p-dioxin]] (1,2,3,8-TCDD).<ref>Jeffrey M. Buth, Peter O. Steen, Charles Sueper, Dylan Blumentritt, Peter J. Vikesland, William A. Arnold and Kristopher McNeill, [http://pubs.acs.org/doi/abs/10.1021/es1001105 "Dioxin Photoproducts of Triclosan and Its Chlorinated Derivatives in Sediment Cores"], Environmental Science & Technology, May 17, 2010, Accessed August 9, 2010.</ref> The 2010 study that revealed this found that over the last 30 years, "the levels of the four dioxins derived from triclosan have risen by 200 to 300 percent, while levels of all the other dioxins have dropped by 73 to 90 percent."<ref>[http://www.sciencedaily.com/releases/2010/05/100518113236.htm "Rising Levels of Dioxins from Common Soap Ingredient in Mississippi River, Study Finds"], Science Daily, May 25, 2010, Accessed August 9, 2010.</ref> Researchers say these compounds “represent a previously unrecognized and increasingly important source of di-, tri-, and tetrachlorinated dibenzo-p-dioxins.”<ref>Janet Raloff[http://www.sciencenews.org/view/generic/id/59333/title/A_new_source_of_dioxins_Clean_hands "A new source of dioxins: Clean hands"], Science News, May 18, 2010, Accessed August 9, 2010.</ref>
==Articles and resources==
* [[Sewage sludge]]
* [[Biosolids]]
* [[Food Rights Network]]
===References===
