Sijhawm Nyeem Ntawv: 2 feeb
Lake trout: Yuav ua li cas tsis noj (los yog tsawg kawg tsis ntau ntawm nws). Credit: Steve Geving, Minnesota Department of Natural Resources, ntawm US EPA.

Hauv qhov xwm txheej zoo tshaj plaws, peb yuav tuaj yeem noj tag nrho Lake Michigan pas dej trout peb xav tau yam tsis muaj kev txhawj xeeb txog kev mob qog noj ntshav los ntawm PCBs - hauv 20 xyoo ntxiv.

Tsawg dua qhov zoo, peb yuav tau tos kom txog thaum 2046.

Cov no yog cov kev kwv yees ntawm US Environmental Protection Agency cov kws tshawb fawb, uas muaj ua qauv Nws yuav siv sij hawm ntev npaum li cas rau Lake Michigan kom tshem tawm nws cov PCBs (aka polychlorinated biphenyls) - cov tshuaj lom neeg tsis tu ncua uas sib sau hauv cov ntses thiab tib neeg thiab, raws li tsab ntawv ceeb toom hais tias, "tau raug txheeb xyuas tas li yog cov kab mob ntawm kev txhawj xeeb tshaj plaws rau tib neeg thiab ecosystem noj qab haus huv hauv Great Lakes. "

Tam sim no, peb yuav tsum tsis txhob noj ntau tshaj ib pluag mov hauv ib lub hlis ntawm lub pas dej trout - piv txwv tias peb lo rau cov ntses me, thiab txiav tawm cov PCB-laden fatty cov ntaub so ntswg thiab daim tawv nqaij.

Monsanto Co. tau tsim 700,000 tons ntawm PCBs los ntawm 1929 txog 1977, raws li tsab ntawv EPA. Lawv tau siv los insulate thiab txias cov khoom siv hluav taws xob. Txwv tsis pub nyob hauv Asmeskas xyoo 1979, lawv tseem nyob ib puag ncig: Hauv Lake Michigan, huab cua thiab cov dej ntws txuas ntxiv coj PCBs mus rau hauv Lake Michigan, raws li EPA, thiab cov pa phem nyob ib puag ncig hauv lub pas dej cov av.

Cov kws tshawb fawb pom txoj hauv kev tseem ceeb ntawm PCBs nkag mus rau hauv lossis tawm hauv lub pas dej niaj hnub no yog los ntawm kev hloov pauv, nkag mus rau hauv huab cua. Thaum ya saum huab cua, lawv taug kev downwind kom txog thaum lawv tso rau hauv av lossis dej rau lwm qhov. (Daim duab ntawm qhov txuas nyob rau nplooj 433.)

Yog xav paub ntxiv:

Wisconsin Department of Natural Resources qhia peb tias ntses twg tsis noj thiab qhov twg tag nrho Daim ntawv qhia noj ntses (ceeb toom: loj PDF, thiab tej zaum yuav txaus ntshai rau avid piscivores). Peb tsis tau tham txog mercury hauv tsab xov xwm no - lwm qhov laj thawj kom zam Wisconsin ntses - tab sis phau ntawv qhia no yeej ua tau.

Links:

EPA cov peev txheej PCB

Lake Michigan Mass Balance Study (tseem EPA)

Ntau los ntawm Xeev Wisconsin txog kev noj ntses

Cov nonprofit Wisconsin Center rau Kev Tshawb Xyuas Xov Xwm (www.WisconsinWatch.org) koom tes nrog Wisconsin Cov Xov Xwm Zej Tsoom, Wisconsin Cov Xov Xwm Rau Pej Xeem, lwm cov xov xwm tshaj tawm thiab UW-Madison Tsev Kawm Ntawv Xov Xwm thiab Kev Sib Txuas Lus. Txhua yam haujlwm tsim, tshaj tawm, tshaj tawm lossis tshaj tawm los ntawm Lub Chaw tsis tas yuav cuam tshuam cov kev xav lossis kev xav ntawm UW-Madison lossis ib qho ntawm cov koom tes.

Rov luam tawm peb cov ntawv dawb, hauv online lossis luam tawm, raws li daim ntawv tso cai Creative Commons.

Nrov dab neeg los ntawm Wisconsin Watch

Kate GoldenMultimedia director thiab reporter

Kate Golden, tus thawj coj hauv xov xwm thiab tshaj xov xwm, tshwj xeeb hauv cov dab neeg ib puag ncig thiab cov ntaub ntawv pom.

Ib teb rau "Cov ntaub ntawv rau cov neeg nuv ntses: ntev npaum li cas kom txog thaum cov ntses muaj kev nyab xeeb?"

  1. Hauv Northeast Wisconsin, Green Bay thiab Lake Michigan, qhov tseem ceeb ntawm PCB (thiab mercury) cov pa phem yog PAPER INDUSTRY raws tus dej Fox, TSIS yog cov khoom siv hluav taws xob.

    Pib xyoo 1954, NCR Corporation thiab Appleton Paper Company tau tsim cov ntawv loj ntawm PCB-coated carbonless luam ntawv rau kev xa tawm thoob ntiaj teb, thiab xa lawv cov khoom pov tseg rau cov neeg siv khoom nyob ze, uas tom qab ntawd muab cov PCBs hauv lawv cov khoom.

    Tsis tas li ntawd, ob peb tus neeg siv khoom loj tom qab siv cov ntawv pov tseg hauv Fox River hav (tshwj xeeb yog Fort Howard Corporation, tam sim no Koch's Georgia-Pacific) tau kis kab mob rau ntau xyoo (thiab qee qhov STILL yog qee qhov), vim tias cov ntaub ntawv qub PCB-coated thiab cov ntaub ntawv tau maj mam raug ntxuav tawm ntawm cov chaw ua haujlwm cov ntaub ntawv txee thiab cov txee dai khaub ncaws, kom rov ua dua los ntawm cov ntaub ntawv rov ua dua tshiab txhua xyoo.

    Tsis muaj ib lub tuam txhab ua haujlwm rau tus kheej no tau ntxuav lawv cov dej khib nyiab ua ntej pov tseg rau hauv Fox River.

    Yog li ntawd, tsawg kawg yog 7 lub tuam txhab ntawv loj tso tawm ntau pua txhiab phaus ntawm PCBs rau hauv Fox River, Green Bay thiab Lake Michigan. Txog li 70% ntawm cov PCBs hauv dej uas paug Lake Michigan tuaj ntawm Fox River nyob rau sab qaum teb Wisconsin.

    Thiab txawm hais tias DNR tau tshaj tawm nws thawj tsab ntawv tshaj tawm hauv xyoo 1972 txog qhov hnyav ntawm PCB paug hauv Fox River, "CLEAN-UP" tsis tau pib txog rau ob peb xyoos dhau los. Tshaj li 30 xyoo dhau los ua ntej peb cov tseem fwv thaum kawg tau tswj hwm tsoomfwv thiab xeev cov cai thiab pib ua REAL los tiv thaiv pej xeem kev noj qab haus huv thiab rov ua kom muaj txiaj ntsig ntawm peb cov khoom ntiag tug: peb tus dej, bay thiab pas dej.

    Tab sis qhov no tau tshwm sim tom qab ntau lab tus tib neeg hauv thaj tsam 4 lub xeev nyob ib puag ncig Lake Michigan twb tau raug mob PCB tseem ceeb, thiab tom qab ib feem loj ntawm Fox River PCBs tau muab sijhawm rau kev khiav mus rau hauv dej tob ntawm sab sauv Bay thiab Lake Michigan kom raug. , tawm mus.

    (Ob peb xyoos dhau los, Wisconsin tus kws tshuaj toxicologist tau hais tias kwv yees li 1/3 ntawm tag nrho cov neeg nyob hauv Wisconsin tam sim no nqa cov PCBs tsis tu ncua hauv lawv lub cev kom dhau qhov pib ua rau muaj feem cuam tshuam rau kev noj qab haus huv. Tau kawg, DNR tus kws kho tsiaj tsiaj txhu tau tawm tsam tam sim ntawd, hais tias " Peb tsis xav ceeb toom rau pej xeem!”)

    Tau ntau tshaj 30 xyoo, kev lag luam ntawv tau thaiv kev nce qib thiab rub nws ko taw TXHUA YAM ntawm txoj kev, thiab lawv txuas ntxiv cuam tshuam thaum twg los tau yog tias nws nyob hauv lawv cov nyiaj txiag txaus siab.

    Hmoov tsis zoo, qhov kawg ntawm Fox River "kev tu" tam sim no tau ua rau muaj kev cuam tshuam tsis zoo los ntawm cov tuam txhab kev nom kev tswv thiab kev ua siab phem ntawm peb cov neeg raug xaiv tsa. Nws tsuas yog kev npau taws ib nrab-hearted kev rau siab. Kwv yees li 50% ntawm PCBs tseem nyob hauv tus dej tau raug "capped" nyob rau hauv qhov chaw, nyob rau hauv ib tug vwm faib patchwork ntawm underwater qhov chaw uas npog qhov tseem ceeb ntawm cov dej hauv qab. Lub npe hu ua "caps" feem ntau tsuas yog 6 ntiv tes ntawm cov xuab zeb, los yog ob peb ko taw ntawm pob zeb thiab pob zeb. Lub kaus mom tsis raug kaw thiab tsis tau muaj pov thawj ua haujlwm ntev hauv cov dej ntws loj, tshwj xeeb tshaj yog nyob rau sab qaum teb kev nyab xeeb nrog lub caij nplooj ntoo hlav hnyav thiab lub caij nplooj zeeg shoves thiab yaig, los yog nthuav tawm (raws li ntau ntawm cov "caps" no) muaj zog. Great Lakes cua daj cua dub uas nce toj.

    Qhov kev kwv yees "nqaij ntses" uas DNR thiab EPA muab rau hauv kab lus no yog raws li Fox River lub kaus mom uas nyob twj ywm.

    Thaum cov "caps" dag no yuav tsum tsis txhob cuam tshuam thiab ua kom tawg, thiab tshwj xeeb tshaj yog thaum dej nyab loj lossis cua daj cua dub obliterates lub kaus mom dheev, tus dej thiab bay yuav rov kis los ntawm PCBs yav dhau los.

    Cov neeg nuv ntses lub "hloov zuj zus" yuav RESET rov qab mus rau xoom.

    Qhov no tuaj yeem tshwm sim ob peb zaug nyob rau ntau pua xyoo tom ntej, kom txog rau thaum tag nrho Fox River PCBs tau muab faib ua tus sib npaug thiab maj mam muab faus rau hauv cov av huv si hauv qhov tob ntawm Bay thiab Lake Michigan. Qee cov PCBs kuj tseem yuav tawg qeeb heev thiab qee qhov yuav volatilize rau saum huab cua thiab tshuab mus rau lwm thaj chaw ntawm lub ntiaj teb, qhov twg NEW neeg tuaj yeem koom nrog peb kev lom zem.

    Peb cov me nyuam thiab cov xeeb ntxwv yuav txaus siab rau qee lub xyoo ntawm cov ntses uas huv si, tab sis nrog cov "caps" tsis zoo thiab tsis zoo, cov sij hawm "huv" tsis tuaj yeem lav tsis tau thiab yuav tsis kav ntev.

    Tsis tas li ntawd, cov tuam txhab lag luam yuav tsum tau them nyiaj tsuas yog 40 xyoo ntawm kev kuaj lub kaus mom thiab saib xyuas ntses. Tom qab ntawd, leej twg paub tias yuav muaj dab tsi tshwm sim?

    Cov koom haum tau khiav tawm ntawm kev tua neeg.

Lus raug kaw.